Aside from cooling. I'm kind of curious. And if it fits, I may try my Webra heli in a plank.

Cooling head, sometimes the carb and often the price.

I've run heli engines in planks with no problems.

The main difference between a heli and standard engine is the head. A heli engine head is much larger to better dissipate the heat, because relatively little air is flowing directly over the engine.

Other than having someone watch out for the Heli Engine Police(tm), you shouldn't have any problems flying a heli engine in a plank. You gotta watch for those Heli Engine Police(tm) though. They appear out of nowhere, beat you down, and drag you off to Siberia where you spend the rest of your life machining Raptor upgrade parts.

Yeah, the head I'd can see. Would I need to use a different plug?

I'm guessin' the carb would be different. Maybe not necessarily optimized for fast transition???

I know what u mean about the price.

Does a heli engine need torque or high revs? Or does it not matter.

I'll say this, the Webra has one nice looking carb. Big too.

Depending on the engine the main difference between a heli and aircraft engine is the head. Some heli engines also have a midrange needle as do some ducted fan engines.
I have seen helicopters that were designed to be able to use an aircraft engine. These helis also had a cooling fan and shroud to direct air over the engines head.
Putting a non heli engine in a heli designed for heli-engines will more than likely lead to overheating-unless you change the engine's head. Then I guess it would be a heli-engine!

Thanks Jazzy-

I'm going the other way... heli engine in a plank. So I'm guessin' I should be OK.

Any feeling as to torque vs high RPM design?

Your heli engine will be fine on a plank-provided the plank has wings and tail feathers!
I saw a picture of a TT heli engine on a Model Tech Magic. No problems there.

Like I said, there are some engines designed towards use in helis. Usually the carb and head are the differences and maybe a ring so that one would only have to replace the ring instead of a piston and liner.

It'll be fine.

Thanks again. The plane is all wing so I guess I'm OK. Either a DD or a Arrow. I guess I'm just worried about over revving the motor with too small a prop. Is that really a problem with glow engines? I've flow mostly electric. And a geared electric can fly apart when over reved. That is around 40k rpm though

And I can ID with ur sig. I just hate it when I do that.

You'd have to try to over-rev a glow engine. Unless you lost the prop in flight.
What size engine is it?

It's a . 52 AR of AAR... something like that. Looks to be about the same size as my OS .46 FX.

Most heli engines have ringed pistons instead of ABC or ABN. Why this is, I'm not entirely sure, but it could be because whirly bird fliers run their engines richer than airplane guys do.

John

Ah-Ha..... I just went to the Webra site. The RPM spec is 2k-20k. So I should be able to prop for a high rpm setup without fear.

200 MPH hear I come

I think the 20 k figure was using a flywheel. It could possibly swing a 7/4 at 20k for a couple of minutes.... ;-)

ZB

Yeah, I understand. I'm just guessing form this that the engine is happy at high rpm.

Although, on my Projeti I run a 5*5 prop at 20k

I'd suspect most heli engines are ringed because of all the time they spend sitting or hovering close to the ground kicking up dust. Ringed engines are far more dirt tolerant than ABx. I'd guess your engine would spin an 8x6 or maybe 9x6 prop at 20K, not much point though because that would be way above the max HP figure. With a flywheel you'd probably go to 30K+ for a short while

Seems like I read where guys liked the 9X9 on the Webra 50..I'd think a 9X8 or 9X9, or maybe an 8X10, would be a good place to start on this engine. And get a pipe....

8*10 sounds awsome. Now if I can just find out how to clean the sticky sticks on my TX.

I am getting an OS-50FSR Heli motor and will bench test it...

I wanted to put it in an Ultrasport, or Patriot if it runs at high rrr's

Will the Macs header and pipe for the 46-FX/SF fit the 50FSR?

I will keep y'all posted if any of y'all cares-

james

I'd like to hear the results.

I'm not sure about the Webra but a few other (sometimes) differences are 1) prop drive hub and collet may not come with motor and can be difficult to obtain , 2) shaft length may be shorter than aero version and "thick" props may be a problem and 3) the heli head may actually cause the engine to run too cool .... not much problem in Florida or inside a cowl..

On mine, a Webra .52 the shaft is a bit short. A MAS prop is an exact fit.
An APC prop needs a tiny bit of thinking to fit. The engine comes with a little washer that exactly fits in the large recess in the hub.

Funny, Webra must have had airplane use in mind as a possibility with this engine. It comes with everyh bit of h/w needed to attach a prop.

In reference to cooling, what glo plug would be a bit on the hotter side? I'm in NE, so it seldom get really hot here. Think engine temp might be a problem?

I'd probably try an OS 8 or Enya 3 .... You could also try an OS F 4-cycle plug if the others are too cold.

Thanks, I may install it in my EZ sport for break-in today.