IMAC 10% rule: bent?
06-30-2002, 08:34 PM
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IMAC 10% rule: bent?
I know that the official IMAC rules state that, although hinge lines do not have to be in the scale places, the basic dimensions of an IMAC-legal airplane can be stretched 10%. For example, if you had a 33% model of a full scale aircraft on which there was a 6 foot vertical stabilizer, the vertical stabilizer could be heightened or shortened by 2.4 inches, because the vertical stab would (assuming exact scale) be 2 feet tall, and 2.4 inches is 10% of 2 feet.
However, a lot of the Aeroworks, Fiberclassics, Carden, etc. planes seem to be quite a bit further stretched than 10%. Check out the full-scale three-views towards the bottom of this PDF: Extra 300L manual
Notice how far out of line the horizonantal stab and wing are. I've attached a picture of an Aeroworks 31% Extra 300L. Notice how in-line the wing and horizontal stab are.
So waddaya think, guys? Are we getting away with it because they're mass-produced kits, or are we still legal?
However, a lot of the Aeroworks, Fiberclassics, Carden, etc. planes seem to be quite a bit further stretched than 10%. Check out the full-scale three-views towards the bottom of this PDF: Extra 300L manual
Notice how far out of line the horizonantal stab and wing are. I've attached a picture of an Aeroworks 31% Extra 300L. Notice how in-line the wing and horizontal stab are.
So waddaya think, guys? Are we getting away with it because they're mass-produced kits, or are we still legal?
06-30-2002, 09:07 PM
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10% Rule
The 10% Rule officially went away this year (and really wasn't enforced for a couple of years).
The new rule is very vague about the fact that it must resemble a full scale aerobatic plane. Personally, I feel the Carden 40% Extra 330S looks NOTHING like the real plane, but it is a widely accepted plane at any IMAC event.
The new rule is very vague about the fact that it must resemble a full scale aerobatic plane. Personally, I feel the Carden 40% Extra 330S looks NOTHING like the real plane, but it is a widely accepted plane at any IMAC event.
07-01-2002, 07:45 AM
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Carden 40% Extra
It does appear to be somewhat off from the original. The wing placement is high (which allows the now all but required "cans" to be installed under the wing tube) however it is a beautiful and capable plane in the air. Ed Alt (former NE IMAC regional director) and Andy Kane (Masters compeditor) were flying these this past weekend at the CAPI in Maryland. John Glezills had the tail almost part company during the freestyle on Saturday of his Fiber Classics Extra. He did notice the plane not responding and landed before any failure in the air. Bill
07-03-2002, 03:49 PM
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IMAC 10% rule: bent?
Most likely yes you would get complaints. It looks scale to me which sounds ok under the rule but I bet you will get grief. Call the CD of any contest you plan on going to before you make the trip.
07-03-2002, 05:20 PM
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IMAC 10% rule: bent?
No, but my dad has 100% SE 
. I actually flew an SE in my first IMAC contest, you remeber that, Chris. It was in basic, of course.
I was thinking of doing a 50% SE for an 0.061...
. I actually flew an SE in my first IMAC contest, you remeber that, Chris. It was in basic, of course.I was thinking of doing a 50% SE for an 0.061...
