on pipe

I bought a 65LA for a bi-plane I have. It has a 72" top- 63" bottom wing, and weighs 8 1/2 lbs. with the engine (19 0z.). Is the 65 big enough or do I need to go to a 90 size? If the OS is ok, what prop should i use? I don't want to go fast with it, it's a scratch built floater. (I don't know if I trust my building capabilities[&o]- too much speed may cause parts to fly off!)[X(] Thanks, Ross

estradajae

It sounds pretty big to me for that engine. the LA is not a very powerful engine.

Any more info about the plane, pictures?

Buit as I said, it sounds very big, and it is even a biplane, so you may need certainly a bigger engine. Weight may be o.k but biplanes are pretty draggy.

your engine should be capable of turning a 12x6 to 13x6 props. In the case that your engine would fly your plane, I would use a 13x5 or 13x6 prop.


Jorge

on pipe

Pictures...

wcmorrison

My Feedback: (2)

You are going to have problems with fuel feed, the engine is too high. The engine needs to be lowered or a perry pump added. Or you need a pumped engine (quite a bit more expensive than a OS LA 65). Those wheels look like the weigh a ton, really don't look like any of the wheels I see around the field. Is the plane balanced?

I think you need a club member or an flight instructor look your plane over. Let him check out your weight and balance, control set up, engine mounting, etc.. I would hate to see your investment crash on the first flight. They can help you get it correct.

BTW, flying is not a first time experience. It takes awhile to learn.

Cheers,

Chip

d_bodary

My Feedback: (85)

It'll fly, actually the 65LA is a decent powered engine.

rcdude7

My Feedback: (264)

One of the magazines published a test where the 65LA out performed the 61FX.

Hobbsy

My Feedback: (102)

Yes indeed, it bested some very good engines in that test, the Fox .60 bested all the engines in that test. I have an LA .65 and it is totally reliable too.

buzzard bait

Now THAT is something different! Your own design? Is that slender rear fuse going to hold everything together with no twisting? Not criticizing, just asking.

If those wheels ARE heavy, and they do look it, replace them with foam model wheels.

Mount the .65 LA at 90 degrees, i.e., cylinder in 9 o'clock position looking at it from the front, because I agree that fuel draw will be a problem otherwise.

Not sure about the prop, but I think I'd try a 13x4 because I think with all that wing it will fly pretty slow, and big diameter/low pitch will give you the best low end thrust.

Let us know how this works out!

Jim

jaka

Hi Pipe!
The OS LA .65 engine can cope with large props. Try 13x5, 13x6 or 14x4W, all APC .

I think you need to look over the plane before you try to fly it!
The engine now sits to high and the lower wing cannot be secured the way it is according to the photos. The rubber bands (at least six ) must sit under the lower wing, not be fastened by hooks...The upper wing struts also need some modifications as they look too weak.
Take contact with a club and get help before you try to fly the plane, there might be some other things that doesn't show in the pictures that need slight modification.

on pipe

Thanks for all the replies... I do need to center the engine on the firewall, I just stuck the engine on with one screw to weigh the plane and check cg. This plane has already flown a few times with a Supertigre 90, but it seemed a little overkill. I want something that vibrates less also. I will give the 65 a try... Ross