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Feb 28, 2002, 09:59 AM
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"1/2a"


Can someone please explain what the term 1/2A means? Thanks
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Feb 28, 2002, 11:02 AM
God is good
Viper Pilot's Avatar
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.
Mar 01, 2002, 06:30 AM
Registered User
Andy W's Avatar
.. in the e-world, it generally refers to speed-400 class LMR gliders..
..a
Oct 11, 2004, 06:37 AM
Valid8r
Valid8r's Avatar
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
Oct 11, 2004, 06:40 AM
Wind is my sworn enemy
WebWolf's Avatar
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
Oct 11, 2004, 06:59 AM
Registered User
Andy W's Avatar
Actually, I believe that would be correct..
..a
Oct 12, 2004, 05:00 PM
Registered User
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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