Mounting Engine on Old Plane - RCCanada - Canada Radio Controlled Hobby Forum
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Old 08-12-2019, 11:36 PM   #1
BW. Hicks
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Mounting Engine on Old Plane


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I have an old scratch built plane that I would like to mount an engine onto. The old mounts are gone and I would like to mount dubro antivibration mounts on it. Where in relation to the wing is a good place to start? Do I level the fuselage and pick the center line and center the engine on that? I know down/side thrust can be added. I'm just looking for a place to start then tweak it from there....
Hopefully what I have asked makes sense. Thanks!
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Old 08-13-2019, 07:00 AM   #2
Cougar429
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Re: Mounting Engine on Old Plane

Most installations will include side and down thrust angles to counter torque and power change effects.

With many kits and ARF's I've seen that is often built into the firewall installation and to keep the prop shaft centered the mount will be offset up and to the left side, (from the position of the pilot seat).

If your firewall is perpendicular to the centerline running down the aircraft you will need to add a tapered shim plate to align the mounts to the engine. If memory serves Sig or another used to sell these with different angles years ago.
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Old 08-13-2019, 07:51 AM   #3
Harvard 387
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Re: Mounting Engine on Old Plane

Side and down thrust are only needed when the plane being powered is a high drag airframe.
If the model has a flat bottomed thick wing it will probably need off set, both down thrust and right thrust. If the model is a sleek, pattern style airframe and a fully symmetrical wing it can usually get away with a 0 - 0, no off set firewall.
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Old 08-13-2019, 09:05 AM   #4
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Re: Mounting Engine on Old Plane

Quote:
Originally Posted by Harvard 387 View Post
Side and down thrust are only needed when the plane being powered is a high drag airframe.
If the model has a flat bottomed thick wing it will probably need off set, both down thrust and right thrust. If the model is a sleek, pattern style airframe and a fully symmetrical wing it can usually get away with a 0 - 0, no off set firewall.
DOWN thrust is, if needed, usually on high wing planes.
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Old 08-18-2019, 10:52 PM   #5
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Here is the plane and wing shape. I want to put a YS 120 in it. It almost fits with the original motor mount that is in the plane. Should I just mount it and try it?
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Old Today, 08:48 PM   #6
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Thanks for your comments on mounting the engine. How would I find the cg on this plane? Is there an easy way to balance it for flight once the engine is on? I'm not sure if this engine is heavier than the one that was originally on it. I think it probably is though. I'll have to increase the size of the fuel tank because the 12oz that is in it wont last long running the .120
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