FlyWV

Could someone please give me a description of what constitutes a 1/2A and 1/8A model?

jlkonn

My Feedback: (1)

1/2A is the only one I can find in the AMA rulebook.
1/2A - .000 to .050
A - .051 to .200
and so on

DICKEYBIRD

.010's are commonly referred to as 1/8A, .020's as 1/4A.

Phlip

Interesting. I just double checked you (no insult intended, I just couldn't believe that my .061s are actually A class) and you're absolutely right. So, technically, there is no such thing as a 1/4 A or 1/8 A engine. Those are all 1/2 A, and those of us who think we're flying 1/2 A with our .061 Norvels or .07 TTs are deluded!

Phil

mclintock

My Feedback: (3)

I always told myself it was one half of A tenth of a cubic inch. But I know it's the ama class thing..

If done today it would probably be sub 1cc and called sub-one.

DHG

My Feedback: (7)

Yep, those displacement classes were established 'way back when, and it explains why Cox made an .049 and an .051. That way, you could fly your Goldberg Viking in 1/2A and A Gas Free-Flight and take home TWO trophies just by swapping the cylinder and piston ... or the whole engine, if you had a paper route and could afford two whole engines. [8D]

FlyWV

Ahh OK, well I guess none of my planes are 1/2A since they're all electric. I was assuning it was the airframe size instead of engine size. I have been calling my Guillows kits 1/2A. No wonder the LHS guy looked at me funny when I said I needed a micro Rx with a built in ESC for my 1/2A Mustang.

I'm new to R/C flying... Knowing is half the battle!

jlkonn

My Feedback: (1)

Fly.
I looked those up in the online AMA rulebook Free Flight section.
There WAS an electric class assigning "A", etc to them.
I didn't pay any attention to what they were since I was looking for "gas".
Gotta to take my daughters' two golden retrievers out.
Otherwise I would look them back up.
JLK

ptulmer

My Feedback: (5)

Naw, the informal definition is anything less than .10. Heck, you can go up to .15 in this forum before Bruce gets you.

combatpigg

My Feedback: (3)

Well, when Bill Robison moderated here, we could even talk about Chrysler Hemis! [X(]
When you think about it, "1/2A" is a lack luster way to describe what we fly, it means very little to most guys. I can't think of anything better, though.

ptulmer

My Feedback: (5)

I'm not sure what a better name would be either. I usually just say that I'm not trying to compensate for anything... unlike the giant scale guys!

combatpigg

My Feedback: (3)

The size of the model is inversely proportional to somethin' or another......this hobby is expensive enough as it is, I just paid $3.18 for a twin pack of 6x3 props! [X(]

FlyWV

Or in my case, HOW I fly

Clean

Whats lackluster about flying 1/2A? In fact if you fly only 1/8A and you do it like that Chipmunk I saw two years ago, man, you iz somebody!
The AMA says they run competitions for .050 and under and classifies them all as 1/2A, but that's just where the AMA stops. Technically there are 1/4 and 1/8 A's, thats how they sold em. There's just not enough draw for the AMA to worry about every engine class so they lump em together.

Jim Thomerson

Actually if you cruse around in the AMA rulebook, you will find engine size classes defined differently in different events. And, of course, the rest of the world thinks 1/2A is 1.5cc, or 09 (not 099).[:-]

hogflyer

Weren't the classes years ago divided into 1/8A, 1/4A, 1/2A, 3/4A, and A? I seem to remember that my Berkley Bootstrap A-R/C showed up to a .099 for 3/4A and a .10 as an A class for AMA payload competition. I'll have to dig out the plans to check on it.