kenh3497

How much rotational movement will a YS 140 have on a Hyde soft mount? I want to build some air dams to control air movement over the engine. I have no experience with soft mounted engines. Thank you.

Ken

flywilly

My Feedback: (121)

Hi Ken,
It depends on which mount used. Typically there is ring to 'capture' movement at the drive washer, either part of the mount or attached to the front of the fuselage. This limits actual movement. Check out the Hyde mounts shown here: https://www.centralhobbies.com/cat3....=31&subcat=143
-Will

kenh3497

I have the nose ring. I'm just curious how much the engine will rotate on the mount. How much will the valve cover move right to left.

Ken

flywilly

My Feedback: (121)

I have allowed +/- 1/8" and not had contact problems, but that can be cutting it pretty close. You can always make the clearance larger, but it is more work to make the holes smaller.

kenh3497

OK thanks!

The engine is contained wholly within the cowl so I just need to add the air dams. They will be attached to the bottom cowl half so I don't want the engine banging into them and destroying the slightly fragile cowl mounts.

Ken

bandicootf16

Hi Ken

You could make the dams from foam rubber/plastic aka CPLR style.



David

kenh3497

OH, that will never work. LOL.

That's a good idea. I'll look around and see what I can scare up in the black hole under my workbench.

Ken

bandicootf16

And the other side

apereira

Foam is the best way, if your engine goes lean in flight and "kick" that will make the engine turn as much as 1/2".

kenh3497

Oh My! I would never have guessed that much. I'll have to make sure to tune carefully and never run out of fuel. Thank you

Ken

David Bathe

Not only can the engine flex sideways 1cm or so, it'll also stretch forward 0.5-1mm depending on the exact type of hyde. This mean you can get some throttle servo binding at full chat, which of course you won't be able to hear but it will take your battery down some. Set up the throttle servo accordingly to allow for the very last ounce of movement to be delivered with full throttle/mount stretch.
A wonderful, happy, friendly and low maintenance YS the 1.40.