Challenger 2 Ultralight - RCCanada - Canada Radio Controlled Hobby Forum
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Old 06-02-2007, 04:40 AM   #1
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Challenger 2 Ultralight

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Hi Guys,

In the process of preparing my Challenger 2 ARF for flight. Has anyone out there have such a model? They are supplied by and I can't seem to find anyone who has one besides me. Its a mid engine pusher prop style that I had to modify.( The fuel tank and the throttle servo were in the wing) I moved the fuel tank to mid cockpit and the throttle servo to the front, connecting via a sullivan control cable. I would like to hear your take on this. If anyones interested, I'll post a photo.

Fly it like you stole it!!!!!!!!!!!!!11
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Old 06-02-2007, 08:46 AM   #2
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WOW! This model looks interesting. Looks like a handful too. Did you move the servo and tank forward to offset some lead?
I think I'd leave the fuel tank in the wing at the balance point so all that changes is wingloading during flight.
Lets see, I just balanced my 8' Beaver with 28 melted down musket balls for about 12oz and you need appox 1.3 lbs. Can see why you want to move things forward. Sure post a pic and goodluck.
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Old 06-02-2007, 09:21 AM   #3
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Yes, Ed it is a very nice model. Sorry don't know of any around. Please post your photos.
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Old 06-02-2007, 09:53 AM   #4
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Is the balance point where the manufacturer recommends (C of G)? Reading the web info it sounds like the first flights might be a bit interesting. They want coordinated turns (rudder and ailerons) and exponential to dampen out pitch sensitivity. Good luck sounds like this one might be a handful on the first few flights until you get the inputs figured out. Best test flown by an experienced pilot it would seem. The only issue with moving the fuel tank is how it will affect the motor. Fuel tanks work best close to the motor and the centerline of the tank even with the spray bar in the carburetor. If you have lowered the tank to hide it in the cabin itís to low and you may never get the engine to run reliably. If you moved the fuel tank forward of the C of G you may get extreme differences in pitch sensitivity as the fuel level changes. Good luck let us know how things turn out.

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Old 06-03-2007, 04:16 AM   #5
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Here is a pic of my airplane set-up
Fly it like you stole it!!!!!!!!!!!!!11
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