RCU Forums - Engine Mounting- Which way up is best?

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Engine Mounting- Which way up is best?

Just wondering about which way up to mount a 4st motor in my spacewalker. Standard installation calls for inverted but I'm wondering if this will affect the cooling/lubrication of the motor. Any suggestions?

Thanks

Paul[8D]

RE: Engine Mounting- Which way up is best?

I'm running a Saito 82 inverted in my Seagull Spacewalker II. Standard Tank installation and have not had any issues to date with cooling, Lubrication or Carburettor flooding. I have used a different exhaust outlet pipe between the Engine & the muffler though. (I got a longer 90 degree one from an earlier engine). The standard (45degree) pipe didn't allow the muffler to clear the cowl very well).

Irrelevant to the original post but I did change out the standard pushrods as it seemed quite easy for the airflow to overcome the control surfaces (especially when I had the 82 wound right up and on "high" rates)

RE: Engine Mounting- Which way up is best?

Quote:

ORIGINAL: aussiesteve

I'm running a Saito 82 inverted in my Seagull Spacewalker II. Standard Tank installation and have not had any issues to date with cooling, Lubrication or Carburettor flooding. I have used a different exhaust outlet pipe between the Engine & the muffler though. (I got a longer 90 degree one from an earlier engine). The standard (45degree) pipe didn't allow the muffler to clear the cowl very well).

Irrelevant to the original post but I did change out the standard pushrods as it seemed quite easy for the airflow to overcome the control surfaces (especially when I had the 82 wound right up and on "high" rates)

I,ll 2nd that as long as the tank is mounted at the right level to the spray bar you sould be fine
they whoever they are say you should try to have 2 time the exit vent area as you do intake area for the cooling flow makes sense if you have the room to make it happen
the only other thing i would say and you should do,nn any plane for that matter is turn the engine over by hand to be sure the cyc isn't full of fuel before you hit it with a starter and bend the rod it happen more then you think.

RE: Engine Mounting- Which way up is best?

This inverted question goes on and on and on. Ask yourself this. Which way is an upright engine when you fly around upside down?? I can do a whole flight inverted with no problems. It would seem listening to all the whining about inverted engines that no one should be able to fly inverted for any length of time without their engine quitting. How about continuous outside loops?? Now that should really cause all kinds of problems.