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Old Jan 25, 2008, 11:43 PM
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Fontana, California, United States
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Video
CN's A-4 Doppler Passes with New Jet Screamer

Here is Corsair Nut's A-4 Skyhawk Doppler passes at AEF It has the Big JS motor, HET 6904 fan, 4500 25C 4S battery, 80 amp esc.


Can someone please doppler these passes for rpm's?

Thanks!
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Old Jan 26, 2008, 12:00 AM
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Quote:
Originally Posted by rvincent
Here is Corsair Nut's A-4 Skyhawk Doppler passes at AEF It has the Big JS motor, HET 6904 fan, 4500 25C 4S battery, 80 amp esc.


Can someone please doppler these passes for rpm's?

Thanks!
Third pass 113.5mph
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Old Jan 26, 2008, 12:02 AM
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What is that in mph? RPM's?
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Old Jan 26, 2008, 12:15 AM
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Quote:
Originally Posted by rvincent
What is that in mph? RPM's?
Approx. 48,728rpm
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Old Jan 26, 2008, 12:19 AM
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Imho, I think the second pass was faster but audio interference was bad. Third pass he was only in WOT for 2.7 seconds before the doppler wave that was recorded so it wasn't at top speed.
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Old Jan 26, 2008, 12:29 AM
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there was so much air traffic he was dodging them. He didn't get on the throttle until he was at the end of the runway. There were many other passes much faster, we just didn't get them on video.
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Old Jan 26, 2008, 01:07 AM
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I was able to pull "pass #2" 114.33 mph @ 48360rpm
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Old Jan 26, 2008, 02:23 AM
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Still a good accomplishment because I know how draggy this big airframe can be. I just set my fan inside and she's almost ready to go!!!

One thing I love about my setup is I can changeout motors fairly quicky and I'm using a 70A ESC to start with so I can play around.

Should be fun!!!
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Old Jan 26, 2008, 07:46 AM
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Denver, CO
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On the last pass I got 111.1 mph, and 48,793 rpm. That rpm is respectable, but at 1200 watts? That's a load of power to get that rpm, almost twice of what the average 2w-20 setup runs (650 watts), and only a difference in kv of 3350 (2w-20) to 3900 (Big JS).

Also, it doesn't sound very consistent to the 1200 watts and 56,800 rpm you got w/ 6s (using HET fan), Bob.
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Old Jan 27, 2008, 10:11 AM
DELTAS RULE
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tehachapi, CA
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it took me 900W in this bird on the 2w 20 to get 43,000 rpm. that was 60A vs the 75A on th ls....15A for 5,000 rpm? 5,000 rpm is a huge jump. it was about 1150W. this motor kicks som major butt.
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Old Jan 27, 2008, 10:16 AM
DELTAS RULE
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at 775W in my 16 on the 2w 20, i onluy got 40,000 rpm.(per dopler)
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Old Jan 27, 2008, 06:52 PM
Renegade Fun Forever!!
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I will tweak it a bit But overall it hits most of my goals It was pretty much what I was aiming for and the in air performance shows what it can do Now in a sleek Sniper or my F-104 and the WM400 fan on 5S to hit 150+mph Who knows your new F-15 may hit 130 with it
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