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Model Forum / Radio Controlled / Air Models / May 2004



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Heli Engine in Plane??

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Technical - 27 May 2004 09:59 GMT
Hi all..

I bought a SC32H engine years back (Don't know why ) and its still in
its box (No silencer).   I'm looking at building a plane from plans in
RCM&E just to see how my woodworking skills are.  Can I use this
engine in the plane even though it was designed for a heli?

Regards

Technical
Old Man - 27 May 2004 14:27 GMT
It depends on the exhaust exit, it will need to be in line (parallel) with
the crankshaft, ideally. If it is a right angles to the crankshaft life may
be difficult.
Also one will need to obtain a suitable muffler from the likes on
www.justengines.co.uk

> Hi all..
>
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>
> Technical
Technical - 27 May 2004 16:42 GMT
Hi Oldman

It's parallel to the crank .. 'like a normal engine'

>It depends on the exhaust exit, it will need to be in line (parallel) with
>the crankshaft, ideally. If it is a right angles to the crankshaft life may
[quoted text clipped - 12 lines]
>>
>> Technical
RC Pilot - 27 May 2004 19:46 GMT
Did exactly this myself with an SC 36 heli' motor in a Ripmax delta.
Fitted it with a MDS 28 quiet silencer (the one with the extra bit in
it). You can barely hear it at half throttle. Motor runs like a clock.
Good engine.
Nigel - 27 May 2004 23:01 GMT
Only real difference is the head which is bigger and will therefore weigh
more and cool more.

A heli engine (when its in a heli) is tucked inside away from the airflow,
so to keep the engine cool it has a big head heatsink which is mounted
inside a shroud and air from a fan is blown across it.

With the head hanging out of the side of a plane in the frsh air, you may
find the engine runs a little cool, but I suspect that this is a minor issue
and that you will have no real problems.

Cheers,

Nigel

> It depends on the exhaust exit, it will need to be in line (parallel) with
> the crankshaft, ideally. If it is a right angles to the crankshaft life may
[quoted text clipped - 12 lines]
> >
> > Technical
Technical - 28 May 2004 21:39 GMT
Thanks for that..

Was looking actually at the 'Nothing Extra' in Model World (not RCM&E
but might look for something similar)

The only thing is, as I read it, he was using an MDS .15 engine with a
tunded pipe.  What way would the SC32H engine run with a standard
silencer.  Would it probably do the same thing that Gile describes -
'produced so much extra thrust on one side that it caused the model to
ground loop on every attempt to take off.'

Interesting!!

Technical

>Only real difference is the head which is bigger and will therefore weigh
>more and cool more.
[quoted text clipped - 28 lines]
>> >
>> > Technical
Nigel - 30 May 2004 22:27 GMT
I'm afraid I haven't seen the model you mention but what I can say is:

i) If it uses an MDS 15 then your 32 will be too heavy and too powerful

ii) Ground looping is more common on tail draggers - aircraft with tricycle
undercarriage hardly ever ground loop if at all.  I think that ground
looping is caused by the torque of the engine and prop.  If you open the
throttle too quickly then the engine torque will be large compaired with the
forward motion and the plane will sharply turn on the ground (usually to the
right).  Once you know that a plane groud loops its just a matter of
advancing the throttle slowly to build up speed and use opposite rudder to
keep it straight.

The plane you should go for will depend very much on your current flying and
building ability.

Cheers,

Nigel

> Thanks for that..
>
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> >> >
> >> > Technical
Technical - 31 May 2004 10:52 GMT
Thanks for that.

Had an idea that the SC32 would be too torquey

Technical

>I'm afraid I haven't seen the model you mention but what I can say is:
>
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>> >> >
>> >> > Technical
 
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