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Heli motor v.s. airplane motor????

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Heli motor v.s. airplane motor????

Old 03-22-2008, 09:15 PM
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kentoby
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Default Heli motor v.s. airplane motor????

I just picked up a Caliber 5 that has an OS max 46 SF installed in it. After doing a bit of research, I discovered that this motor is listed under the AIRPLANE heading on the OS site. Is running this engine in my heli a problem or not??


Thanks,


KT
Old 03-23-2008, 09:01 PM
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kentoby
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Default RE: Heli motor v.s. airplane motor????

Somebody... Anybody know the difference between an Airplane Engine and a Helicopter OS engine?? Is there a difference or is this a marketing ploy???

Thanks,

KT
Old 03-24-2008, 05:24 AM
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Cyberfyn
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Default RE: Heli motor v.s. airplane motor????

The crankcases are the same but the heads are very different. The heli head need a bigger cooling area as they don't get the same amount of airflow. Does it have a round or square head like this?



OS heli engines have an H prefix in the name: http://www.osengines.com/engines/heli.html

So it sounds to me like someone has fitted a plane engine to it.... Not a great idea. I'd eBay the fitted engine and get a true heli variant.

Ian F.
Old 03-24-2008, 07:06 AM
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kentoby
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Default RE: Heli motor v.s. airplane motor????

Yes, someone has gone the extra step and added a larger square heli head. Am I OK???

Thanks,

KT
Old 03-24-2008, 08:28 AM
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fasterjman
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Default RE: Heli motor v.s. airplane motor????

Theres one other diference as well...The needle valves. There are 3 on a heli engine. A high, medium, and low speed. Jeff
Old 03-24-2008, 01:05 PM
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Default RE: Heli motor v.s. airplane motor????

Most heli engines are ringed engines.

EDIT - Looks like they made a heli version of that engine:

http://www.osengines.com/parts/xr15440.html
Old 03-24-2008, 02:54 PM
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Default RE: Heli motor v.s. airplane motor????

The heli version has a shorter crankshaft, most helicopters won't fit a standard airplane engine. OS has (had i think) a 46 heli engine. The carb sucked, you could never get a good balance between the high and low end without the midrange being out of whack.

Some heli carbs have 3 needles, some have two, all depends on the engine.

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