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Old 04-21-2003 | 02:44 PM
  #52  
Jeremy Sebens
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Joined: Apr 2002
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From: Champaign, IL
Default Power system

What prop are you guys using? I seem to recall maybe a 24X12?

We don't have quite the headroom that you guys do on propulsion. We run an Astro 60 w/superbox turning an 18X18 APC on 40 CP1300's. Static, it draws around 29 Amps, and we get between 2.5 to 3.5 of WOT time in the air, depending on mission, speed, etc. Static thrust is about 9 lbf uninstalled, and drops to around 8 installed. Our takeoffs aren't quite as authoritative as the one I witnessed SWAG-1 do, and we have less runtime, but I think our plane might be a bit faster. Depending on wind conditions, we may have energy trouble with the radome mission, but with management, I don't think it'll kill us.

I noticed that Junior has no apparent inlet for motor cooling. Have you guys checked motor temp after flight? Bryan had called me to consult about some battery troubles - perhaps the motor is overheating. Ours needs a decent amount of air to stay cool, and we even added a heatsink. If nothing else, it certainly looks cool!

Oh, if anyone wants to try out the Belle, I'm attaching my RealFlight model of it. It looks like a P-51, but flies like our little beast. Takeoff is actually easier with the real thing, though. Gotta hate that Realflight landing gear model. Just unzip the files into your Planes directory. Both the aircraft and the engine are in there.
Attached Files
File Type: zip
72546_7716.zip (2.2 KB, 20 views)