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Old Feb 28, 2002, 09:59 AM
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san diego
Joined Oct 2001
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"1/2a"

Can someone please explain what the term 1/2A means? Thanks
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Old Feb 28, 2002, 11:02 AM
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Viper Pilot's Avatar
Banjul
Joined Jan 2001
4,246 Posts
Back in the "Good Ole Days" planes were classified by the motor displacement used.
Class A had 0.1 cubic inch motors.
Planes powered by 0.05 ci motors then became 1/2A.
This is a good size plane for converting to e-power.
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Old Mar 01, 2002, 06:30 AM
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Marietta, GA
Joined Jun 1999
43,312 Posts
.. in the e-world, it generally refers to speed-400 class LMR gliders..
..a
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Old Oct 11, 2004, 06:37 AM
Valid8r
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Boston and Belgium
Joined Jul 2004
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You've got my curiosity up now... I used to fly the old .049 control line planes as a kid, were/are those 1/2A then or something else???

Jon
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Old Oct 11, 2004, 06:40 AM
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WebWolf's Avatar
Gothenburg Saeve, Sweden
Joined Sep 2004
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Quote:
Originally Posted by Valid8r
You've got my curiosity up now... I used to fly the old .049 control line planes as a kid, were/are those 1/2A then or something else???

Jon
No that just had to be 49/1000A
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Old Oct 11, 2004, 06:59 AM
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Marietta, GA
Joined Jun 1999
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Actually, I believe that would be correct..
..a
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Old Oct 12, 2004, 05:00 PM
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United States, SC, Irmo
Joined Jul 2004
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For purposes of competition, the AMA, and probably the FAI internationally, considers class 1/2 A to run from 0.000 ci to 0.050 ci, class A from 0.051 to 0.200 ci, 0.201 to 0.300 ci as class B, 0.301 to 0.400 as class C, and 0.401 to 0.670 as class D. These divisions are why you used to see things like some mfgs putting out an .049 and an .051, a .19 and a .201 or .21, and the Johnson and Veco companies had a .29 and .31 or.32. When Free flight was the major competitive category, these size splits would allow a flyer to compete in two classes with the same plane by changing engines. The two displacements would have almost exactly the same weight and performance, so the engines could be swapped without any major readjustments.
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