Friday, December 25, 2015

"Spark Testing" Sport Aviation / Experimenter "Technically Speaking" Article November 2015

Sport Aviation / Experimenter magazine "Technically Speaking" November 2015 Article

Our monthly column in Sport Aviation/Experimenter  Magazine for the month of November was an article on spark testing steels.We discuss methods which you can use to identify a piece of 4130 chrome Molly steel from a piece of mild steel or any other type of metal for that matter.

If you're not a member of EAA "you should be".The magazine alone is well worth the annual membership fee.

Spark Testing

As with most building trades, (electricians, masons, carpenters,) there are time proven materials and a base line method of performing tasks which become “standard practice”. As an aircraft builder, you soon learn that there is also a time proven set of practices and building materials that are commonplace within the aviation community.
If there is one universal commonality among the countless aircraft types, it is the use of steel within the structure in some form or another. From the very earliest of aircraft to even the most current, exotic composite aircraft, there is still steel in some form or another used within the aircraft.
The FAA Aircraft Maintenance Technicians Handbook (FAA-8083-30), Chapter 05, has a great explanation of all of the different types of steels, their chemical composition, their characteristics, and usage.

Saturday, December 19, 2015

EMG-6 Renderings


We have posted these renderings to help in the visualization of the EMG-6. Click on one of the images to see all of the images in a slide show. These are large format pictures and may take some time to download.

Thursday, December 17, 2015

EMG-6 "Shop Notes" December 2015

December "Shop Notes"

"EMG-6 Shop Notes" is a day-to-day accounting of what's going on in the shop with the EMG-6 Electric Motor Glider.

December 18, 2015 TapMatic tapping head.

We have finally got the tapping process down to a science.

The final resolution to accomplishing the tapping process was the switch from a cutting system to a roll forming process.

The depth of the tapped hole had to be nearly .75 inches deep .

When cutting into soft material like 6061 T6 aluminum is very easy for the flutes of the To get completely plugged up and then increase the torque on the tap to the point where it snaps off.

We discovered this the hard way experimenting with multiple different tapping methods of using a cutting tap. 

We managed to break 7 taps before we finally resolved the situation.

We even broke one of the roll form taps trying to tap a hole with the original drill size.

Wednesday, December 16, 2015

57-10-51 Inboard Diagonal Strut Fitting

57-10-51 Inboard Diagonal Strut Fitting Construction

In this posting here were just going to go through the process of manufacturing 57-10-51 inboard diagonal strut fitting.

This is just kind of an inside look into what takes place during the manufacturing process of some of the components on the aircraft.

The drawings on the builder database are PDF files that are used both by the builders or the assemblers of the aircraft as well as during the part manufacturing process.

The PDF file gives and in context orientation of the part for the overview of where the part is used As well as a detailed three view drawing for manufacturing purposes.

Once again we remind you every time we post something on one of these postings that the drawings are only updated on the builder database and not on these postings.

Sunday, December 6, 2015

Best Method For Keeping up with the EMG-6

Most recent EMG-6 information direct to your mailbox.

We continue to hear from many of you avid followers of the progress blog. We try to do our best to blog as often as possible. But if you're one of those that are checking the blog 3 to 4 times a day to see what new information is being posted, I think we need to do an intervention. We do appreciate your enthusiastic following but we also have a simpler way to keep track of all new information being posted to the blog.

Sometimes the monthly shop notes can get rather lengthy. 

This process will send you only the most recent of information.

Located on the home page of the blog is a little box titled "follow by email."

Type in your email address and click on the submit button.

Wednesday, December 2, 2015

27-41-00 Rudder Assembly LD

27-41-00 Rudder Assembly LD

This is an overview of the drawings that are located in chapter 27-41 for the rudder assembly within the builders database. 
Keep in mind that the drawings that are located within the progress blog do not get updated as time goes on. Only the drawings that are located within the builders database. Our current and up-to-date and have the most recent revisions.

Thursday, November 26, 2015

Fuselage Boom Reference Drawings/Pictures

53-20 Fuselage Boom 

We have added some additional reference pictures to help with the assembly of the fuselage boom. These are primarily to assist with the  overall orientation of the components and the assembly process.

These pictures have also been uploaded to the builders database and are available. There under chapter 53-20.

Tuesday, November 10, 2015

EMG-6 "Shop Notes" November 2015

November "Shop Notes"

"EMG-6 Shop Notes" is a day-to-day accounting of what's going on in the shop with the EMG-6 Electric Motor Glider.

November 25, 2015 Test manufacturing of another (LD) Rudder assembly.

Since the temperature has dropped substantially. The productivity and the big hangar which does not have heat becomes impractical.

I asked Jason today to work in hangar seven and go through the process of building the rudder assembly.

We have redesigned the rudder assembly slightly .

All of the components are identical except we have replaced the leading edge with a smaller, lighter weight, and more aesthetic leading edge that incorporates the leading edge spar into the one-piece leading edge. 

This simplifies the construction process And it makes it possible to fit the entire rudder kit into a much smaller package for shipping.

All of the original pieces and holes still line up using the new leading edge piece and those of you that currently have a rudder assembly can simply swap out for the new leading edge. If you prefer.

In addition to redesigning the rudder assembly. We will be using the new design on the dope and fabric covered airframe that were currently in the process of building.

Since Jason has never put together the rudder assembly before. I've asked him simply to use the drawings that we currently have available and assembled the rudder without any input from me other than to help construct the new leading edge.

Saturday, October 31, 2015

"Trust the Tuck Method" Sport Aviation / Experimenter "Technically Speaking" Article October 2015

"Cotter Pins" 

Sport Aviation / Experimenter magazine "Technically Speaking" October 2015 Article

Our monthly column in Sport Aviation/Experimenter  Magazine for the month of October was an article on Cotter pins

We discuss The "Tuck Method" of installing a Cotter pin

Trust The Tuck Method

Cotter pins have been commonplace in aviation as far back as the Wright brothers. This also appears to have been the same time frame that the last update was made in regards to the subject of cotter pins. Even the * FAA advisory circular (AC) 43.13-1B is unchanged from its original version and dedicates only two paragraphs to the subject: “Cotter pins are used to secure such items as bolts, screws, pins, and shafts. Their use is favored because they can be removed and installed quickly. The diameter of the cotter pins selected for any application should be the largest size that will fit consistent with the diameter of the cotter pin hole and/or the slots in the nut. Cotter pins should not be reused on aircraft.” (Par. 7-127, a.) This information is followed by a brief, one sentence paragraph which reads: “To prevent injury during and after pin installation, the end of the cotter pin can be rolled and tucked.” (Par. 7-127, b.) In this article, we will reference Par. b to justify a different method for installation of the venerable cotter pin.

Sunday, October 11, 2015

EMG-6 "Shop Notes" October 2015

October "Shop Notes"

"EMG-6 Shop Notes" is a day-to-day accounting of what's going on in the shop with the EMG-6 Electric Motor Glider.

October 11, 2015, Light Sport Repairman Maintenance Class

We are now about halfway through the October light sport repairman maintenance class that we teach each year. These classes happen 3 to 4 times a year in Corning California and are the primary source of income that supplies the capital for developing the EMG-6 aircraft.
And as such, for those of you that feel angst during the period of time where we hold the light sport repairman maintenance classes because of the lack of posts on the blog we seek your understanding. 

Tuesday, September 29, 2015

EMG-6 "Shop Notes" September 2015

September "Shop Notes"

"EMG-6 Shop Notes" is a day-to-day accounting of what's going on in the shop with the EMG-6 Electric Motor Glider.

September 29, 2015 Finish Covering of the Left Wing

In this picture here we are starting on day two of the wing covering process.

The wing has set overnight and we can now start doing some of the finish tapes.

We should be able to finish up the left wing by this afternoon and get a start on the right wing.

During the construction process. We have been videotaping all of the process to produce a time lapse photography, video of the wing covering.

Sunday, September 27, 2015

"Twist Welding" Sport Aviation / Experimenter "Technically Speaking" Article August 2015

"Twist Welding" 

Sport Aviation / Experimenter magazine "Technically Speaking" August 2015 Article

Our monthly column in Sport Aviation/Experimenter  Magazine for the month of August was an article on Twist Welding cables.

This is technique that we developed over the years and have refined and now use on a regular basis. When working on aircraft with cables of any type.

Watch the Companion Video

Twist Weld (Cable End Treatment)

What is Twist Welding? “Twist Welding” is a process for treating the end of a cable to prevent it from unraveling. The idea was originally shared with us by one of our students. He had been in the
cable industry for nearly 30 years and had a more basic version of our technique, but didn’t have a name for it. We coined the term “Twist Welding” while developing and refining the technique.(Figure: 1)

Wednesday, September 16, 2015

Reno Air Races 2015

Reno Air Races 2015

We took a little time away from the Corning airport this week to attend the national championship air races at Reno, Nevada. I took over 2000 photographs and selected a few here that were worthy of looking at.

Tuesday, September 15, 2015

EMG-6-250 Fun Flying September 2015 (Video)

Our First flight after returning from the Oshkosh AirVenture 2015 Airshow. After reassembly and a good pre-flight we are back in the air. In this video we decided to get some video from a little different perspective.

Friday, September 11, 2015

Wing Rib Attach Fitting Manufacturing (video)

In this "How it's Made" episode of Building the EMG-6 we see how the Wing Rib Attach Fittings are manufactured.

Thursday, September 10, 2015

Wing Rib Manufacturing (video)

In this video we go from start to finish with the manufacturer of the wing ribs. We show several methods by which you can make your own rib  bending fixtures.

Saturday, August 29, 2015

Fuselage Boom Kits

53-20 Boom Assembly

In this posting of the blog we will have a complete look at the fuselage boom assembly. We will do this simultaneously as we are putting the fuselage boom kits together.

53-20-51 Bulkhead 1

Friday, August 28, 2015

"Make Sure the Pipe Fits"

July Sport Aviation Magazine Article

"Make Sure the Pipe Fits"

In July 2015, EAA Sport Aviation Magazine started combining Experimenter magazine with Sport Aviation Magazine. Experimenter Magazine for many years had been an online publication. We are really happy to see it back into the main body of Sport Aviation. 
As most of you know we are in now writing a monthly article in the Experimenter section. The column is titled "Technically Speaking".
The topic for the July issue was pipe fittings and their use in aviation.
Each month, after submitting our article to Sport Aviation magazine We reformat the article with additional information and pictures above and beyond what will fit into the space constraints within the Sport Aviation magazine article.
We will post this expanded article each month in the blog. We put quite a bit of work into these articles and they generally lend for really good reading.

Pipe Fittings in Aviation.

Pipe threads are used in virtually every aircraft built today, from ultralights to Boeing’s finest. In sport aviation we use the pipe thread fittings throughout the aircraft, including fuel systems, brakes, oil, hydraulic, coolant and even pitot static systems. The pipe fitting has been around for quite some time, however, after looking through the FAA’s extensive selection of maintenance publications, this seems to be an area that has only been touched on lightly. We continue to see confusion, problems, and even accidents as a result of misunderstanding the subject of pipe fittings.
Pipe Thread Types
The most common types of tapered pipe thread used in the United States are the NPT (National Pipe Tapered Thread), The ANPT (Aeronautical National Pipe Tapered Thread), And the NPTF (National Pipe Tapered Fine Thread)
The NPT (National Pipe Tapered Thread) are constructed using a “Seller’s” thread (truncated peaks and valleys) with threads having an included angle of 60° and a 1.7899° taper. (Figure 1)
The ANPT (Aeronautical National Pipe Tapered Thread) is essentially an NPT thread that undergoes additional quality assurance requirements.
The NPTF (National Pipe Tapered Fine Thread) is also referred to as Dryseal American National Standard Tapered Pipe Thread. (ANSI B1.20.3) This thread was designed to provide a leak free seal without the use of Teflon tape or sealing compound. It is essentially the same thread as the NPT with the root and crest of the threads modified to provide an interference fit during installation. Time has shown that this often works okay during the initial installation, but the use of fittings with the NPTF thread on subsequent removal and re-installation will almost certainly leak without the use of a thread sealant.

Pipe Thread Size
An experienced aircraft builder or mechanic can very easily identify the size of a pipe fitting visually from across the workbench. With the limited sizes which we use in small aircraft, and a little bit of practice, you will soon be able to identify them by sight as well. The most common sizes used in light aircraft are 1/8”, 1/4”, and 3/8”. Until you become familiar with the different sizes, you can use the size chart (Figure 2) to help with identification. Either place the physical fitting directly onto the diagram or take a measurement of the end of the pipe fitting with a pair of calipers.

For easy identification aircraft aluminum fittings are anodized blue and steel fittings are plated black. Commercial grade Brass fitting are, of course, brass colored. (Figure 3)

Leaking Fittings
The problem of leakage arises as a result of the design of the threads. Particularly on an NPT thread where the root and the crest are truncated. (Figure 5) This design allows for a helical passage from the inside of the fitting through the root and the crest of each thread to allow fluid to pass around the perimeter of the thread until it can escape presenting itself as a leak.  (Figure 6)
The purpose of thread sealant is to fill in this passage way between the crest of the male and female thread. It is not possible to stop a leak on a pipe thread by tightening the fitting. This is because tightening the fitting does not eliminate this passage way. If you find that you have a pipe fitting that is leaking, the only method by which you can eliminate the leak is to remove the fitting, reapply thread sealing compound, reinstall and tightened properly.

Tips for proper installation of fittings with the NPT (National Pipe Tapered Thread)

Tip 1. Before installation inspect both the fitting and the boss, the boss is the raised area on a component that is drilled and threaded for the fitting. (Figure 7) Inspect both the fitting and the boss for damage and cleanliness. Clean, if needed.
Tip 2. Apply the proper thread sealant to the threads of the fitting to be installed. The type of thread sealant that will be used will primarily depend on the type of fluid used in that system. Each manufacturer of a system component may also decide the proper thread sealant to be used considering factors other than the type of fluid such as temperature, environment, vibration, and whether the part is removed for service routinely. The amount of thread sealant needed is limited to the amount that will fill the void where the threads are truncated on the fitting. Ensure that no thread sealant extends to the end of the threads where it could be ingested into the fluid system. Many an engine has quit because of thread sealant or Teflon tape being ingested into a carburetor or fuel injection system plugging a fuel passage.
Note regarding the use of Teflon Tape: Although there are some instances where the manufacturer recommends the use of Teflon tape on a pipe fitting, this is an area to tread carefully. The potential of Teflon tape being ingested into a fluid system is a high enough risk that most manufactures recommend the use of a pipe sealant instead. In addition, the use of Teflon tape substantially reduces the amount of friction during installation. This can lead to over torque of the fitting and cracking of the boss in which it is installed. And because of the low friction of the Teflon tape, this also leads to loosening of the fitting in high vibration environments.

Tip 3. Install the fitting ensuring that it remains concentric to the hole in the boss during the installation process. Pipe threads are notoriously easy to cross thread. The fitting should rotate 2 - 3 turns smoothly by hand until finger tight. If it rotates less than 2 turns or more than 3 1/2 turns, this is an indication that there is a possible problem.
Tip 4. Once installed finger tight, continue to tighten using a wrench. For the smaller size fittings 3/4” and smaller tighten between 2 - 3 turns beyond finger tight. Because of the nature of the tapered pipe thread, the tightening procedure is somewhat discretionary. Although torque guidelines can be found in some publications, the proper installation requires that you develop a “feel” for the proper torque. A good rule of thumb is to turn until the fitting is tight enough to prevent movement or loosening and then slightly more, if needed, for proper fitting alignment. Not tightening enough could result in the fitting becoming loose and leaking. In contrast over torquing could result in cracking the boss. (Figure 8) Cracking is particularly common when over torquing where there is a thin cross-section at the boss and the material is manufactured from aluminum or magnesium. The quality of the threads both internal and external very greatly and will have some effect on the amount of tightening necessary. After final installation, you should have between 3 1/2 and 6 threads fully engaged.

Tip 5. Ensure that there are no side loads or bending loads applied to pipe fittings. There are literally hundreds of examples of system failures and airplane crashes as a result of improperly side-loading a pipe fitting.

The photo to the right is a classic example of improper use of threaded pipe fittings. In this case, a Rotax 912S powered Tecnam light sport aircraft was modified to accommodate the installation of a Hobbs meter pressure switch (Figure 9). The original oil pressure sender was removed from the oil pressure port on the side of the engine. A commercial grade brass tee fitting was installed with a 1/8 inch brass pipe nipple into the oil pressure port. The oil pressure sender and the Hobbs meter pressure switch were installed into the tee fitting. The added weight and the extended arm of these two components resulted in overloading and subsequent failure of the brass pipe nipple. This caused a loss of oil pressure and an off field landing, resulting in substantial damage to the aircraft (Figure 10).
Now that we understand a little bit more about the use of pipe fittings in aircraft, we should be able to approach the pipe fitting from a little different perspective. We have provided some generic information and rules which should help you to make better choices regarding the use of pipe fittings. However, the tips and information here should never take precedence over the manufacturer’s recommendations for your particular aircraft.
For additional information about the use of pipe fittings in aviation applications we recommend the following references:

Mechanics Tool Box (John Schwarner)
FAA-H-8083-30 Aviation Maintenance Technician Handbook General

Fuselage Boom Assembly Bulkhead #3 Chapter 53-20-53

53-20-53 Bulkhead #3

Each one of the bulkheads that are manufactured for the fuselage boom assembly are referenced in a 7 page PDF document.

This document can be utilized by the builder of the aircraft as well as the technicians within the shop that are manufacturing the parts.

Page 1 of the PDF shows and overall view of the flat layout and reference dimensions that can be used for many different purposes during the building as well as during the manufacturing of the components from the technician standpoint in the shop.

Wednesday, August 26, 2015

55-10 Vertical Stabilizer

Vertical Stabilizer Assembly

55-10 Is the Code for the Vertical Stabilizer Assembly.

We have been updating the builder database with new drawings. These are the most current drawings available to the builders. However, it is important that you recognize that only the drawings that are contained within the builder database are updated. Any changes to the drawings occur only on the drawings that show up within the builders database. To have access to all of the builder database you need to become a EMG-6 member and receive a serial number.

To find out more about becoming an EMG-6 builder and member and get started on building your own aircraft. Click here

Thursday, August 20, 2015

EMG-6 "Shop Notes" for the Month of August 2015

EMG-6 "Shop Notes" and Index for the month of August 2015

In our upgrade the progress blog for the EMG-6 we will be formatting our process slightly different than we have done in the past. Previously we have just rambled on and taken pictures on a daily basis of everything that's happening in the shop. This works out great for following along and just seeing how things work, but in the future we will try and have each post have a little bit more continuity with the previous posts. We will make a page called shop notes an index for each month but we will make changes to each topic page as we progress. This will show a single subject matter from start to finish and help tie all the things that happened over the previous months together with a single subject. Any subject matter worth pictures and explanation we will create into its own post.

Manufacturing 9" Radius Tube Bending Dies

Bending Die Design

As most of you know that have been following this blog's progress. We have been in a transition period trying to retool as a result of Quicksilver Aeronautics no longer being able to any of our parts. One of the areas that we were outsourcing was the bending of the large diameter tubes that are used for the fuselage keel tube as well as the wing tips on the EMG-6. Several months ago we purchased a  production tube bending machine which didn't come with any tooling. Much to our shock, we found that the tooling costs are outrageous for the dies and mandrels. To purchase a die set for the 9 inch radius needed for the keel and the wingtip. The cost was going to be $2000. In identifying the requirements for bending these 1 inch diameter 6061 T6 aluminum tubes. We realized that on a large radius like this. We could easily manufacturer our own bending die. We designed the die to fit our machine and have begun the process of building the individual segments that we will assemble to make the overall 9 inch radius die. We only need 180° of bend capability. So this is what we ended up with for the design.

Monday, August 10, 2015

Un-Boxing of the Polini 250 Dual Spark Engine

This is the un-boxing video that we shot back in May 2015. Un-boxing videos are fairly popular because of their revealing nature of what to expect when purchasing a new product. If you are going to spend several thousand dollars on a new engine it's kinda nice to see more information about the product before it shows up on your doorstep. So we look at how the engine is packaged and shipped along with what we should expect to see inside of the box with all of the extra components and accessories. It is also a candid look of our first impressions of the motor.

Sunday, August 9, 2015

EMG-6 Configurations

The Many Ways to Configure the EMG-6 Aircraft


 This is the basic configuration for the primary structure for the aircraft.
The aircraft could be built and flown as an experimental amateur built aircraft in this configuration.
This aircraft in this specific configuration would not qualify as a part 103 legal ultralight. In order to fly this aircraft as an ultralight the airframe would have to be configured with at least one small electric motor or perhaps a small gas powered motor.

In this configuration the builder of the aircraft could assemble a significant portion of the airframe themselves saving a great deal of cost. Our goal is to be of the build this aircraft for under 10 K.

As a single place experimental aircraft the aircraft could be flown with either a glider rating for a private pilot's rating or as a sport pilot rating. As an experimental aircraft no glider rating is needed for single pilot operations.

Saturday, August 8, 2015

10 Tips for Using This Blog Successfully

10 Blog Navigating Tips.

This blog is currently being populated with information from the old progress blog and once we have completed the propagation of the old information we should have nearly 1000 postings.

As you might imagine finding the information that you're interested in could be a bit challenging.

Hundreds of great articles and resources are at your disposal with just a few clicks.

Friday, August 7, 2015

EAA Hints For Homebulders

EAA video hints for home-builder's section is a great resource for learning about building and maintaining aircraft. We have been participating in the video development for this section of EAA's website since 2008. We have done over 100 videos and webinars. We have provided a link here so that you can take a look at some of the videos that we have done to date.

Click here for link to EAA Hints for Home-builders

If you book mark this link it will automatically update with any of our new videos that are published.

Thursday, August 6, 2015

Rainbow Aviation Services becomes dealer for Polini Motors

Rainbow Aviation Services is currently working with Polini motors to become a major US importer and service center for the complete line of Polini motors. After we complete our initial investigation and testing of the Polini 250 dual spark engine we will make a determination as to the future potential for the Polini 250 being used in the EMG-6. All of our initial testing gives us great optimism that this is the perfect Reciprocating engine Power plant package for the EMG-6. After we have made our initial investigation and decide that this is the motor that we want to invest more time and money this direction we will begin to stock both engines and parts as well as setting up the shop for doing major overhauls and repairs of the Polini series of motors. Combination of Rainbow Aviation and the light sport repairman courses maintenance program should make for the premier service center for the Polini motors. Rainbow Aviation Services will also be visiting the factory in Italy early next year for additional training.

Saturday, August 1, 2015


 Polini and the EMG-6

The Polini Motor is one of the Power Plant option that we have adapted for the EMG-6 for those that are wanting longer cross county capability or just in the interim until the electrical power plant systems are more refined.


- The cylinder is die-cast in light alloy, it ensures a better thermal stability.

- The piston, gravity cast at high silicon content light alloy, reduces thermal expansion and the coupling slack. The design of the piston top is specific to optimize the compression ratio.

- It is provided with a balancing countershaft; this feature cancels the vibrations and guarantees comfort never felt during a flight and a longer life for the engine itself. The counter-rotating rollers decrease greatly the upsetting torque-steer for an extra comfort in flight.

-The centrifugal clutch is in oil bath with helicoid mechanical reduction.

- The electric starting is standard but to offer the maximum safety the engine is also equipped with manual starter with easy system thanks to the flash starter device that speeds up and simplifies the movements.

- It is equipped with the comfortable closed-circuit system for the recovery of fuel during transportation and the 12 V output for any use.
Small and compact THOR 250 DUAL SPARK engine has an extraordinary power to weight ratio.

Monday, July 27, 2015

EMG-6 Flying at AirVenture 2015 Video

The EMG-6 flew during every available session during air venture 2015. However there was only one session during the very 1st day that we were able to shoot video. My son Kristian was the cameraman. This year at Oshkosh was the best year in 10 years in terms of the attendance in the ultralight area. With I think 30+ vendors also a new record. The flight operations area was very crowded and the amount of flight time was somewhat limited. Most of the flight operations windows were limited And typically we would only get 4 circuits within the traffic pattern before we were shut down. We did manage however to get a total of 4.3 hours on the aircraft at the show.

Friday, July 24, 2015

ATA Chapter Titles (System Identification)

ATA Codes as used on the EMG-6

This page provides the definitions of each chapter relating to a particular section of the aircraft. We are using a modified version of the (JASC) and (ATA) code table. This coding system helped keep track of where information is located for particular components on the aircraft.  This is simply an easy way to organize all of the information related to the aircraft.

All of the Aircraft Part Numbering System is based on this Code.
For Example Part Number 53-20-52  shown at the right

53 Fuselage Assembly

    -20 Fuselage Boom Sub Assembly

         -52 Fuselage Boom Sub Assembly Bulkhead #2

Thursday, July 16, 2015

Country Colors

Renderings of the EMG-6

Our vision for some possible color schemes for the EMG-6

Saturday, July 11, 2015

Tail Wheel Operation Video

Tail Wheel Operation Video

We've put together a simple video showing steerable the tail wheel in action. the tail wheel is connected via springs to the rudder. The spring pressure provides for good positive steering without being too stiff. In a couple of segments within the video you can see the tail wheel deflected beyond the direction of travel and the springs allow the tail wheel to simply center up without changing direction. In addition the maximum angle for the tail wheel correlates with the radius with one of the main wheel brakes locked up. This allows the airplane to be turned on a very tight radius pivoting around one of the main wheels.

Thursday, July 9, 2015

Main Landing Gear Modifications

Main Landing Gear Modification Finished

We have finished the modifications to the main landing gear to incorporate the larger 6 inch wheels and tires. 

We also moved the landing gear aft. We were able to get another hours test flight on the aircraft using this landing gear system. 

Aircraft handles so much better now. The tail comes up almost instantaneously after applying power. 

We decided to go ahead and put an extra wide stance on to the landing gear.

Steerable Tail Wheel

Steerable Tail Wheel

We've decided it's time to install the steerable tail wheel option.

We are planning to fly and demonstrate the aircraft at the EAA air venture and the necessity for being able to taxi and maneuver the aircraft on the ground is much different than operating off of our small airport with minimal traffic.

The tail wheel bracket assembly installed on the tail skid. All of the design is intended to be able to retrofit from one type of landing gear to another with minimal effort.

Main Landing Gear Modification

Main Landing Gear Modification

In the last video we looked at the results of moving the landing gear axle position aft. Moving the axles back to the forward position was necessary and as a new landing gear had to be manufactured. we also decided to move the landing gear to provide for a little narrower track, approximately 3 inches narrower. And we decided to lower the aircraft by another inch and a half.