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Old 09-04-2007 | 04:04 AM
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k_sonn
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From: Pasadena, MD
Default RE: BVM Electra Build

The maiden was performed on Sunday. Most of the flight was performed at 1/2 throttle with a couple of high throttle passes. I didn't want to push it too hard. The Electra is a great flying airplane and with the Turbo Fan 4000/Nue 1527 1.5Y motor combo it is fast.

I dopplered the upwind and two downwind passes. The temperature was 93F. I set the temp on the WaveOscope doppler software for 30C (86F). The wind was blowing down the runway at 10mph with gust up to 15mph. Both downwind passes started with a slight dive.

Here are the numbers from the WaveOscope doppler program. I adjusted the speed in the upwind to compensate for the head wind and in the downwind pass to compensate for the tail wind and dive using the following formulas:
(Upwind Speed) + (Head wind Speed) = Speed of Pass
(Downwind Speed) - (Tail Wind Speed) - (Est. Speed Picked up in Dive) = Speed

Upwind Pass:
Time on video - 2:01 to 2:11
Speed - 242kph/150mph
Adjusted Speed - 150+10 = 160mph

First Downwind Pass:
Time on video - 2:20 to 2:29
Speed - 340kph/211mph
Adjusted Speed - 211-10-10 = 191mph

Second Downwind Pass:
Time on video - 2:52 to 3:00
Speed - 370kph/230mph
Adjusted Speed - 230-10-15 = 205mph

In the coming couple of weeks I plan to use an Eagle Tree and radar to verify the doppler readings.

Here's a link to the video: [link=http://www.rcgroups.com/forums/showthread.php?t=737082#post8107319]http://www.rcgroups.com/forums/showthread.php?t=737082#post8107319[/link]

Kirk
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