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Post  John Goddard Tue Mar 27, 2012 3:57 pm

No not the Who
But can any of you....
I keep seeing the following regurgitated on websites ,-
'Modelers could fly the same plane in two competition classes (i.e. A and 1/2A) simply by changing the engine.'

Is it just bods cutting and pasting stuff cos it sounds (almost) plausible or is there a class over there where 049's
are disallowed and only 051's are eligible?
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Post  WingingIt74 Tue Mar 27, 2012 4:02 pm

Just found this site, very good info...
http://www.clspeed.com/node/7

Looks like the "1/2A" cut off is a .0504 and "A" is .0505 to .15, per the AMA CL Speed Rules.


Last edited by WingingIt74 on Tue Mar 27, 2012 4:18 pm; edited 3 times in total
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Post  nitroairplane Tue Mar 27, 2012 4:03 pm

1/2a is or was .049 and A was .05 and up or maybe there was an upper limit maybe .15 eg build an FF contest model and use it for and 1/2a by swapping tee dee .049 to .051, understand.
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Post  John Goddard Tue Mar 27, 2012 4:26 pm

So they actually had a lower size limit for
A speed event?
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Post  nitroairplane Tue Mar 27, 2012 4:27 pm

John Goddard wrote:So they actually had a lower size limit for
A speed event?
Crackers
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Yeah it does seem odd but I am sure they had a reason.
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Post  WingingIt74 Tue Mar 27, 2012 4:42 pm

http://www.modelaircraft.org/files/2011-2012CLSpeed.pdf
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Post  andrew Tue Mar 27, 2012 5:02 pm

I think that swapping engines to compete in 1/2A and A classes would have placed you at a significant disadvantage for the performance catagories, but would not be so disadvantageous in freeflight.

http://www.modelaircraft.org/files/2011-2012OutdoorFreeFlightrev2.pdf
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Post  WingingIt74 Tue Mar 27, 2012 5:14 pm

It all comes down to aerodynamics and thrust/weight. A .051 will weight a lot less then a .15.
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Post  John Goddard Wed Mar 28, 2012 4:28 am

Naw I guess I'm just one of lifes Dummies.
I still don't geddit.
Particularly then having a 'if it's a jet use what ever you like' policy.
I wonder if the tail (ie Cox) was wagging the dog on this or perhaps
it just wasn't very well thought through.
lol!
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Post  WingingIt74 Wed Mar 28, 2012 7:19 am

It's bracket racing. From this size to this size is this bracket and from this size to this size is another bracket. Cox made the 051 to compete in the A while retaining the same case as 1/2A. It was a good move on their part, to get people interested in the next bracket of racing at a minimal cost. The next jump would be into a .09 or .15 Tee Dee and a whole new plane.
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Post  ahrma_581 Wed Mar 28, 2012 10:09 am

andrew wrote:I think that swapping engines to compete in 1/2A and A classes would have placed you at a significant disadvantage for the performance catagories, but would not be so disadvantageous in freeflight.

http://www.modelaircraft.org/files/2011-2012OutdoorFreeFlightrev2.pdf

+1

Think it was more of a marketing blurb than anything: 1/2a freeflight kit could also be built for A class by using an .051. Can't imagine anyone would enter both classes at the same meet using a single airframe. Altho' it would be pretty funny watching someone chase thermals around the field while frantically trying to swap engines.
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