This may be a stupid question, but can you use a heli engine in a plane?[&o]

Don't know if you can, but if you can, just bolt on your prop and spinner, atach the throttle arm, and try it. Someone with more experience may chime in, I don;t know for sure.

The thing that will stop you is their is nothing to put the spinner on. If you can get something to work I don’t see why, but it isn’t suggested. Just wondering, why can’t you get a normal airplane engine?

Yes, you can. The biggest difference is that a heli engine has larger cooling fins since it doesn't have a prop blowing air over it.

Yes the only thing i saw different is the size of the head. The reason I am asking: I purchased a brand new Toki .40 sight unseen for 30.00. The fellow said it was an areo engine, but not resurching was my mistake, so thought I would still use it if I could. Engine looks new.

Ok here is what I was talking about. Hopeful you can see what I was talking about

Thrust washer, prop nut, and a prop reamer solves that problem.

Well you also get more cooling, there is an advantage. Don't heli engines also have to run richer?

seemefly_1 may just have a point.
I tried once with an old heli engine I bought off of Ebay.
With an airplane prop hub in place the crank shaft is not physically long enough. I put a prop and washer on and that came flush with the end of the shaft, not even enough room to start threading a nut on.
The engine I had may be an exception but that is what happened

Yes, seemefly may have a point indeed.

I was going by an old heli engine that I once had, so they may have changed since then

I also notice, well my o.s. 50 seems to be running at higher RPM's, I don' think this would need to be carried to an airplane though, it is just capible of running high RPM's. But it will just stay cooler, and yes, they need to be ericher, my helis are very rich, or they won't run, I think they can be leaned out when you get a prop on it to cool it.

One of the guys in my club flys a plane with a heli engine on it. It screams.

One in my club too. It also screams, but this particular pilot has a deficiency in his ability to move the left stick backwards. Firewalled from take off till deadstick, then he greases the landing.

Works well, but I can't speak for it's transition.....

I have an old OS .32F-H heli engine that I've run in a couple of different planes over the years with no problems. The only difference with this engine between it and the airplane version is the cooling fins on the head, and a shorter crankshaft, which makes it hard to do a spinner+prop+washer+nut, but if you use one of the nut/spinner combos (like dubro or higly or whatnot), some of them fit under the spinner, and many metal spinners have thinner backplates than plastic ones. The last plane I had my .32 in was a biplane, so I just had the prop and a higgly spinner nut on there, and had no problems. Oh, low pitch props help here as well, as they have thinner hubs.

The only other differnece between the airplane and heli version is that the heli engine is ringed instead of ABC, but that's no big deal. Back when that engine was made, OS sold most all their engines in both ABC and ringed versions.

Now, it's going to vary engine to engine. The carb espeically could be an issue, but frankly the heli carbs usually work better and are more adjustable than airplane-engine carbs anyway.

Thanks for all the help guys. Here is a pic of it. Let me know if you see a prob with it.

ya that’s a heli [8D] as you can see from the pics I posted you need to find something for the spinner.

I think i;ll use the spinner nut combo.

You need a drive hub, The part circled in seemefly' first picture in post #6

We have a guy at our field who flys a os 90 heli engine on a plane. Its just heavier and takes more tail weight to balance it out.

Once you get a prop hub, you'll be all set, as others have said. You won't be able to just stick a prop on there without one though.

Jburry, If you remove the part about greased landings it would sound like the guy at my field. We have nick named him splat. He just can't seem to fly with out cracking up.