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Old 02-21-2008 | 06:24 PM
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Default aircraft size limits

Is there any rule limiting the size or scale of aircraft used to compete in a sanctioned IMAC contest?
Old 02-21-2008 | 07:01 PM
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Default RE: aircraft size limits

Yes, the AMA legal weight limit of 55 pounds.
Old 02-22-2008 | 03:23 PM
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Default RE: aircraft size limits

Thanks. That's what I thought. Then why do I see 50% airplanes competing where the manufacturer claims finished weights well in excess of that limit?
Old 02-22-2008 | 05:39 PM
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Default RE: aircraft size limits

You can request a special waiver from AMA to fly large aircraft. It's very common.

Page 3 --- Rule #2
The maximum takeoff weight of a model aircraft, including fuel, is 55 pounds, except for those flown under the AMA Experimental Aircraft Rules.
http://www.modelaircraft.org/PDF-files/memanual.pdf

Here is the Waiver on the 55lb limit
http://www.modelaircraft.org/PDF-files/520-A.pdf

Here is the inspector list if you need somebody to look at a big airplane:
http://www.modelaircraft.org/PDF-files/520-B.pdf

Current Issued permits:
http://www.modelaircraft.org/PDF-files/520-C.pdf
Old 02-22-2008 | 05:46 PM
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Default RE: aircraft size limits

So once one has the permits can he then use that airplane to compete in contests?
Old 02-22-2008 | 05:58 PM
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Default RE: aircraft size limits

Yes. Once the plane is AMA legal it can be flown
Old 02-22-2008 | 06:43 PM
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Default RE: aircraft size limits

Yup. He needs to have an inspector go over the plane. He needs to fly it and prove that he can handle it and it is safe to fly. There is some process to the whole thing. I don't know all the details. The general idea is that it gets inspected by an official and then it must be flown a certain number of times to "prove" it. Then he gets the waiver/permit.

At that point--it's the same as any other plane in the hands of a covered AMA pilot. Doesn't matter if it's a 5% design or a 65% design. If it's under 55 pounds he can fly it. OR, if it's over 55 pounds he has to get a waiver/permit to fly it-- and it's legal in any IMAC contest or AMA sanctioned field.

I imagine that a local club could have a specific rule regarding weight of planes and DQ a guy for having a plane that was too big. But I doubt that you'd ever see it happen. Almost everybody that I've ever seen or talked too likes 'em big. The bigger the better!! [>:] Can't imagine anyone complaining that a plane was TOO big.

Thats like telling a woman she's got too many shoes. [sm=lol.gif]

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