Ikaros

Well, that pic of a TL-96 with a 0.10 engine is not a 1/2 A I understand .

Well, its a small plane anyway.

Please enlighten me!

What is excaclty a 1/2 A plane or engine ?

Is it 0.05 or less cu in displacement ? What about electrics ?

Cheers,

Ikaros

Ikaros

blast!

2fast4u

My Feedback: (5)

That question comes up a lot around here. If you spend some time and do a search you will find some very detailed answers to that very question.

I'm not the expert.....but 1/8A is .010...1/4A is .020...1/2A is .049.. I think "A" is .10. I hope that helps. It's not perfect but close to the mark. Have a great day.

William Robison

My Feedback: (3)

Ikaros:

Classically:

A) up to 0.19 cid
B) 0.200 to 0.299 cid
C) 0.30 to 0.499 cid
D) 0.50 to 0.651 cid.

!/2A was an addition around 1950 to accomodate the smaller engines that became available, and was up to 0.049 CID.

These classes allowed you to fly, for example, both 1/2A and A free flight with the same plane by switching your Holland Hornet 0.049 with your 0.051 Hornet.

Also you could switch your Ohlsson and Rice 19 and your O&R 23 for another dual class airplane. K&B also had 19 and 23 engine sizes.

When the 1/2A was added, the "C" class was expanded to include the previous "D" class, and "D" was eliminated.

Then, about 1960, the European influence was felt, and the "A" limit was lowered to 0.15, and "B" became 0.151 to 0.299 cid.

1/8A and 1/4A have never, to my knowledge, been "Official" classes.

And the official classes are all blurred now.

Unless you are flying a "Formula" event with specific requirements it pretty much depends entirely on how big or small you want your plane to be. So make it "Your" size and don't worry about what "Class" it is.

Big or small, it's a twin, that's all.

Bill.

Ikaros

There is always something new to learn !

Cheers,
Ikaros