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Anti-vibration engine mounts - who is better

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Old 02-21-2011, 02:58 PM
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jp1961
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Default Anti-vibration engine mounts - who is better

Who makes a better anti-vibration engine mount, Du-Bro or Dave Brown?


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Old 02-21-2011, 04:58 PM
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Default RE: Anti-vibration engine mounts - who is better

If you want the best, [link=http://www.centralhobbies.com/engines/mounts/hydmnts.html]Hyde.[/link]
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Old 02-21-2011, 07:06 PM
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Default RE: Anti-vibration engine mounts - who is better


Quote:
ORIGINAL: ThumbSkull

If you want the best, [link=http://www.centralhobbies.com/engines/mounts/hydmnts.html]Hyde.[/link]
What he said!.... [:@]
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Old 02-22-2011, 01:10 AM
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Default RE: Anti-vibration engine mounts - who is better

There is no doubt any plane model will last much longer; if mounts that isolate it from engine vibration are used.

But I do have reservations, about whether a rigid mounting would not be much better; if optimum engine effectiveness is desired...

All vibra-mounts allow the engine to bounce all around and to change its thrust-line, which makes it less effective in producing thrust.
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Old 02-22-2011, 06:13 AM
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Default RE: Anti-vibration engine mounts - who is better

Dar, while there is no doubt you like to sound smart, on this topic you are wrong.

Yes, an anti-vibe mount will be good for the plane and it will rob a very small amount of performance.

The Hyde mounts only allow a small amount of movement from torque direction.
They allow no movement in the engine thrust line. Almost all of the pattern fliers with
competition level planes use the Hyde mounts for this very reason.
They even use a nose ring which holds and seals the nose of the plane to the engine.
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Old 02-22-2011, 06:36 AM
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Default RE: Anti-vibration engine mounts - who is better

TS,


I don't 'like' to sound smart, but to many I often do...[>:]

I did see several F3A models (I am not sure whether they had the nose ring or not), equipped with YS 1.70 Dingo and 1.60 engines running...
Although I could not exactly quantify this; they all appeared to be vibrating in all three axes; not only around the crankshaft axis.

This is what brought up the question in the first place.

I see no 'rigid axle' within the structure of the mount, that would prevent free movement... that would limit movement only to torsion...
If, for example, the mount is connected to the airframe; and force is applied to the beams from above; the bottom part of the rubber isolation pad would compress and its top would stretch...
This would result in shifting of the thrust-line down...

I am sure this does not comply with your theory.
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Old 02-22-2011, 06:47 AM
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Default RE: Anti-vibration engine mounts - who is better

I haven't tried a vibration mount in a long time on a airplane. But when I last did, it was pretty cool at low throttle or idle watching the engine wiggle around on the motor mount. But when you went WOT the engine stopped wiggling and ran straight then. I think I was running something similar to the Dubro mount last, but it used four large rubber spacers with screws on each end to bolt it on with.  I believe the anti-vibration motor mounts have certain resonant frequencies they are designed to filter out. So at low speed the mounts will behave like they do with a car engine at idle, as it wiggles around idling. But at higher speeds it should straighten out OK. You would need to try one and at WOT feel the airplane and when it is in the air listen to the noise the fuselage and wing makes as you fly by. Usually the rigid mount setup will cause a resonant drum like noise from the fuselage and wing as you fly by, with the anti-vibration mount this noise ought to be reduced greatly.
I sorta got out of using them after a while.  But they seemed to work well when I did though. I sorta liked the engine wiggling at idle. it reminded me of Harley motorycles idling at stop lights.

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Old 02-22-2011, 06:48 AM
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Default RE: Anti-vibration engine mounts - who is better

So, what do you think of the "soft" mount offered by Toni Clark for the Zenoah?

Thanks.

Richard
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Old 02-22-2011, 07:08 AM
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Default RE: Anti-vibration engine mounts - who is better

I have use the Durbo vibra mounts for years with great results, very little engine movement and they work great. I found everyone has an opinion, the best way is try them and either you will like them or not, I went with others opinions before on certain products only to find them to be totaly unacceptable to me.
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Old 02-22-2011, 07:20 AM
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Default RE: Anti-vibration engine mounts - who is better


Quote:
ORIGINAL: Waco

I have use the Durbo vibra mounts for years with great results, very little engine movement and they work great. I found everyone has an opinion, the best way is try them and either you will like them or not, I went with others opinions before on certain products only to find them to be totaly unacceptable to me.
Waco,


This is easy to say, but with some such mounts costing $140-$200 - the price of several engines each, to mount just one engine; it ain't very easy to do...[&o]

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Old 02-22-2011, 07:33 AM
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Default RE: Anti-vibration engine mounts - who is better

I have never tried any of the high dollar ones, cost isn't worth it, but of all the ones around 40.00 and under that I have tried the Dubro mounts were the best ones I liked personally. I have hard mounted my engines for years but after trying the Dubro mounts I would never go back to hard mounting.
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Old 02-22-2011, 09:47 AM
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Default RE: Anti-vibration engine mounts - who is better

Even $40 for an engine mount is way too expensive...

I've used rigid, $5 fiber-filled nylon mount all along. I guess I'll continue doing it.
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Old 02-22-2011, 09:50 AM
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Default RE: Anti-vibration engine mounts - who is better

Saito recommend metal mounts for their engines.

Regards, Richard
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Old 02-24-2011, 07:59 AM
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Default RE: Anti-vibration engine mounts - who is better

I am still a fan of the old fashioned wood motor mounts myself. The best ones were always the hard Maple wood strips, but plywood still works good. These types of wood mounts extend back to about the leading edge of the wing inside the fuselage. Before someone comments on it, the excess oil was from the muffler coming slightly loose on me.


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Old 02-24-2011, 02:12 PM
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Default RE: Anti-vibration engine mounts - who is better

If your not running a big engine 1.40 glow or bigger not worth it. Years ago in RCM there was a test and the hyde mount helped not only vibration over the rest but in pattern planes with digital servos; the power draw on the battery was less because the vibration did not have the servos hunting for center. Like a 100mah difference in draw per servo.
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Old 02-24-2011, 06:33 PM
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Default RE: Anti-vibration engine mounts - who is better

Some forum has a thread on how to make a mount like the Hyde. It looks fairly easy to do. May be on the FG forum. Capt,n
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