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Engine mounted at 45deg?

Old 04-15-2020, 12:11 PM
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xcz5785
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Default Engine mounted at 45deg?

I bought a used .40 sized Tower Hobbies Ultimate. The engine calls for .45-.55. It has a .60 YS 2 stroke. The engine is mounted at about a 45 degree angle 'ish. The previous owner said it was "to compensate moment from the engine and a force from top wing".
It has a baffle to deflect the air down to cool the head. Can someone explain the benefits of this? Is it to help compensate or neutralize the torque of this high compression engine? I have never heard of this before. I would like to mount it sideways to put the head right in the cowl opening.
Old 04-16-2020, 05:28 AM
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Steve Collins
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It sounds like BS to me. I used to do it but it was more for getting the muffler closer to the fuse than anything else.
Old 04-16-2020, 09:26 AM
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Yeah, that's a big ole load there. The reason to mount a motor at an angle is to get the muffler in a better place and/or to get a better relationship between the c/l of the fuel tank and the high speed needle inlet. Torque is no different no matter how the motor is oriented as long as it's still on there square.

carl
Old 04-16-2020, 10:07 AM
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^^^^^^^ Exactly
Old 04-16-2020, 11:19 AM
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As noted, besides the direction of the exhaust, the other common reason was to get the carb more in line with the tank, to avoid pulling fuel too far up hill, in some planes. (Usual recommendation is the main needle to be about 1/4" above the centerline of the tank). But, the YS has a built in pump...hence won't be an issue, no matter how you mount it.
Old 04-16-2020, 05:25 PM
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Ok thanks guys! I just wanted to know if there was a trick I was not aware of. The muffler thing makes sense and since it is a pumped engine that negates having to have it in line with the tank as ted said.
Old 04-21-2020, 09:01 AM
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I would try and keep the orientation between the engine and the fuel tank within that 1/4" regardless. You might want to put a different engine on it someday without a pump. Could save you a lot of cussing.

carl

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