Saturday, March 29, 2014

EMG-6 Safety Link Failure on Launch (Video)





EMG-6 Safety Link Failure on Launch 

Test flight number 44 and we experience a safety link failure on launch. During this test flight we were flying the aircraft in gusty wind conditions consistently gusting above 17 mph. The 4 launches that we conducted this day were fairly aggressive with rates of climb up to 1500 ft./m. At the end of the flight with the aircraft still on the ground you can see the wind gusting and indicating 17 mph on the airspeed indicator. The airspeed indicator does not register until 15 mph.

EMG-6 Aggressive Launch (video)





EMG-6 Aggressive Launch 

Test flight number 41 During this test flight we were flying the aircraft in gusty wind conditions consistently gusting above 17 mph. The 4 launches that we conducted this day were fairly aggressive with rates of climb up to 1500 ft./m.


Tuesday, March 25, 2014

EMG-6 Hands Off Stability Test (Video)





EMG-6 Hands Off Stability Test 

Test flight number 39. On this flight test sequence we show the initial tests for hands-off flight characteristics. Although this is only a short flight we fly the entire downwind leg of the tow to 700 feet with our hands and feet off of the flight controls. In the video you can see by shifting the center of gravity through movement of the body I can control the direction and the airspeed of the aircraft. The aircraft is rocksolid stable and Trims up right at best glide speed. Even by taking my feet off of the rudder pedals shifts the center of gravity enough that you can see the nose pitch down slightly.




Friday, March 7, 2014

EMG-6 Landing using the nose skid (Video)






EMG-6 Landing using the nose skid 

In this short clip we show the EMG-6 landing in no wind conditions using the nose skid as a brake. We had recently changed the main wheel from the larger wheel down to the smaller size will and had made some adjustments to the brake handle but did not quite get it positioned correctly as you can see in the video.

Monday, March 3, 2014

EMG-6 Flight #29 Flight Data (Video)






EMG-6 Flight #29 Flight Data 

In this video we have shown just the instrument cam. This will give a overview of a typical flight. The aircraft is configured with the airspeed indicator on the left side of the instrument panel. The stall warning light comes on periodically and is set for 33 mph even though the actual stall speed is closer to 25 mph. On the right side of the instrument panel is the altimeter. The altitude was set at 271 feet at the takeoff point and achieved a maximum altitude of 891 feet, making this a 620 foot tow. They tow altitude was a little lower than usual primarily due to the conservative nature of the tow being the 1st flight of the day. You can see in the video that we were having to maintain altitude after take off level with the ground because of the tow vehicle being a manual transmission has a hesitation in the tow when shifting gears. On the variometer on the bottom portion of the screen is displayed altitude and vertical speed both of which are very sensitive but lag behind by several seconds as would be normal with a barometric pressure controlled instrument. Also GPS ground speed GPS track and glide ratio as a relationship of ground speed is displayed as well. You may have to watch the video in HD and order to get a clear picture of the instruments.



Tail Cam Complete Flight





Tail Cam Complete Flight 

This video is a simple single shot camera mounted on the vertical stabilizer near the rudder. But shows the perspective of the tow vehicle and the tow rope. We have made several videos utilizing this position the camera checking the aft fuselage for flutter and ballooning of the rear fairing as well as identifying the interaction of the propeller blades in the static condition. In this video the propeller blades are actually held close to the motor using a rubber band. On other videos with the propeller blades left to float free the bottom blade doesn't possess enough drag to even streamline the blade completely. If the blades are positioned to either side they will streamline with the motor.