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All Forums >> RC Airplanes >> "1/2 A" & "1/8 A" airplanes >> what does 1/2A really mean?
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what does 1/2A really mean? - 5/17/2002 5:35:01 PM   
Cactus.



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From: CamborneCornwall, UNITED KINGDOM
Status: offline 		what does 1/2A ect really mean? i've got a OS 25 with 2A on the carb. and i've got a 1/2A shrike, but thats got a 15 in it..
i know it must mean size of something, but what?

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1/2A - 5/17/2002 6:14:43 PM   
AirplaneDan98


 

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Status: offline 		Are you sure you don't have the Shrike .15? I can't imagine the 1/2A Shrike with a .15!! Maybe 1/2A means 1/2 an engine! Just kidding, I have no clue.

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what does 1/2A really mean? - 5/17/2002 6:19:00 PM   
Cactus.



Posts: 6138
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From: CamborneCornwall, UNITED KINGDOM
Status: offline 		well, thats what i mean, it is a .15, but im sure some one called it a 1/2A unless theres 3 versions of it...

ok, anyone? define all the */*a's

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what does 1/2A really mean? - 5/17/2002 6:25:22 PM   
AirplaneDan98


 

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Status: offline 		There are three versions. I have a Shrike .15 and it sounds like ou do to. The 1/2A shrike has a wingspan of 24 1/2 inches, the .15 has one of about 35 inches. Which do you have? They fly great though, don't they?

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what does 1/2A really mean? - 5/17/2002 6:51:06 PM   
Cactus.



Posts: 6138
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Status: offline 		i deffinatly got the 15 one and they fly fantastic i love fast low pssses with it. why would anyone want a Wonder over this.

But i think i just figured this out in the shower......
My 25 is 2A
a .049 is 1/2A
is A a unit of volume?
so 1A is anything in .10 size, 2A any .20, 3A .30's 1/8A .010?
have i got it?
And that Greek bloke figured his idea out in a bath

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what does 1/2A really mean? - 5/17/2002 7:03:36 PM   
EASYTIGER


 

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Status: offline 		Nope. In the old days, there were three classes, A(09-19) B(20-49) and C(50 and up).
1/2 A is stuff up to .09, 1/4A up to .02, and 1/8a up to .01.
Or something like that! It came from HALF of class A.

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what does 1/2A really mean? - 5/17/2002 7:04:54 PM   
EASYTIGER


 

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Status: offline 		My buddy Joe designed the shrike! They have been done from 02 size right up to RAM 500 power. No kidding!

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what does 1/2A really mean? - 5/17/2002 7:21:00 PM   
Cactus.



Posts: 6138
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Status: offline 		see, trust the old days to make what is a simple system hard lol

Well done to Joe they'd make a good glider too, but i cant help look at my 15 size, and think, foam wing, 36 and pipe.... ummmmmmm

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what does 1/2A really mean? - 5/17/2002 9:45:13 PM   
EASYTIGER


 

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From: nyc, NY, USA
Status: offline 		You said it, the system made no sense! When they started the classes, nobody ever dreamed of .049 engines. Remember, they were all ignition engines with a coil and condenser and batteries...

Yep, you can make a REALLY hot shrike...they have been up to 200 mph for sure. You don't need to reinforce it much, you would be surprised at how well the airframe holds together...

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What is 1/2A? - 5/18/2002 6:46:49 AM   
airjeffro


 

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Status: offline 		1/2A is "HALF A TENTH" with "A" being up to .10 cu in.

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Re: What is 1/2A? - 5/18/2002 7:31:41 AM   
EASYTIGER


 

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Status: offline 		[QUOTE]Originally posted by airjeffro
1/2A is "HALF A TENTH" with "A" being up to .10 cu in. [/QUOTE]

No sir. Respectfully...that is incorrect. It came from class A, class B, class C. Half of class A.

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1/2a - 5/18/2002 8:05:52 AM   
fastlash


 

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Status: offline 		Easy tiger has the correct terms on 1/2a, its an age thing

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oops - 5/18/2002 8:26:06 AM   
airjeffro


 

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Status: offline 		I stand corrected. It's a good day when you learn something, (like confirm your info) oops

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what does 1/2A really mean? - 5/18/2002 8:26:32 AM   
EASYTIGER


 

Posts: 7676
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Status: offline 		Hey, I'm only 33...I thought EVERYBODY knew this stuff!

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what does 1/2A really mean? - 5/18/2002 8:46:19 AM   
airjeffro


 

Posts: 98
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Status: offline 		How much info do we loose when a brain cell dies? lol

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1/2a - 5/18/2002 10:14:54 AM   
fastlash


 

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Status: offline 		1/2a describes how many brain cells you have at age 50, half as much on average, Ilearn new things every day ,remembering them is the problem,

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what does 1/2A really mean? - 5/18/2002 2:43:29 PM   
Cactus.



Posts: 6138
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From: CamborneCornwall, UNITED KINGDOM
Status: offline 		the system i thought it was is the one that makes sense.
the system that it is is the one that makes no sense lol
would be so easy for kit makers to say 2A-3A plane, oh yes, thats a 20 to a 39 size, but then again, they could just say that LOL

Could it be anything to do with what type of insurance or something you would need? i know you have to take tests and have diffrent insurance if you fly over a certain weight..
then again, its a very old system, i guess A is small, B is normal, C is large, so maybe it does make sense lol

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&n