Thread: Build Log 12" USAF UFO scratchbuild
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Old Nov 21, 2011, 05:44 PM
GooberSB is offline
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United States, VA, Fluvanna
Joined Jan 2011
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Build Log
12" USAF UFO scratchbuild

I wanted to see how small I could go and make something I consider stable. I've tried wings down to 16" and found that they are very unpredicatble at that size (other than predictably fast and unstable).

So I decided to try a 12" version of gpw's UFO. Based on my experience with the 22" version I theorized that if the wing area was kept at slightly better than a HZ Champ and the same electronics were used I could create something that flies at about the speed of a Champ but have the stability of a disc. That's how the idea came about.

Here's the result
12" UFO (2 min 3 sec)


It weighs 55.5g and the wing loading is just under 2 oz / sq ft. My target weight was 60g so I was happy to be a little under that.

The details:
6mm FFF circle @ 12" diameter
3mm $Tree semi-circle @ 12" diameter
Champ/Vapor ESC/Rx brick
Champ motor/gearbox/prop
Champ/Vapor CF control rods
Flyzone Playmate landing gear
450mah 3.7v lipo

This build has boosted my confidence after a failed build this weekend. Now I'm working on a Sky Ray build by gpw, a 48" UFO, and a KFm-4ward wing by ombudsman.

The build that failed? A very unstable butterfly shape based off a cartoony butterfly clipart picture I liked.

SB
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Last edited by GooberSB; Dec 06, 2011 at 07:47 PM.
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