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Sullivan Vibration absorbing Engine mount

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Old 04-13-2005, 11:04 AM
  #1
exeter_acres
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Default Sullivan Vibration absorbing Engine mount

did a search with no results....

I have seen the ad for the Sullivan vibration absorption engine mount.....using the backplate of the engine....

anyone use one of these? any thoughts?

I think it is called the flex mount....or something like that


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Exeter
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Old 04-13-2005, 11:13 AM
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Default RE: Sullivan Vibration absorbing Engine mount

Tower makes one originally intended for the US 41 that works pretty well.

http://www2.towerhobbies.com/cgi-bin...?&I=LXJ774&P=7

The sullivan mount costs $35.95

http://www2.towerhobbies.com/cgi-bin...&I=LXFT82&P=RF

Jim
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Old 04-13-2005, 11:25 AM
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Default RE: Sullivan Vibration absorbing Engine mount

Hmmm...the sullivan one I saw was like the GP large engine mount and used the backplate screws, but for smaller engines...

This would be for .91 to 1.20 4 strokes

Is it worth it?
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Old 04-13-2005, 11:30 AM
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Default RE: Sullivan Vibration absorbing Engine mount

Dubro makes a beam mount this one is 120 but they make a 91 size too.

http://www2.towerhobbies.com/cgi-bin...&I=LXD633&P=RF

Jim
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Old 04-13-2005, 11:43 AM
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Default RE: Sullivan Vibration absorbing Engine mount

the Sullivan mount is a little scary.... WHEN (not IF) the rubber isolators fail, the engine will part company with the firewall.... also, there is a LOT more low speed movement than with the Dubro beam mount (which is fail safe).

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Old 04-13-2005, 11:51 AM
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Default RE: Sullivan Vibration absorbing Engine mount

Ex Ache:

Here is what you are asking about:

Quote:
Flex-Mounts. Vibration absorbing motor mount for two cycle engines attaches the engine directly to the fire wall with bonded Lord Mounts and eliminates the weight and space of a standard motor mount. S275 S276

S275 Kit for .35-.50 size engines (1.28 oz)
S276 .35-.50 Plate only
S277 .35-.80 Isolators only (fit S275 and S278)
S278 Kit for .50-.80 size engines (1.38 oz)
S279 .50-.80 Plate only
S281 Kit for .80-1.20 size engines (4.67 oz)
S282 .80-1.20 Plate only
S283 .80-1.20 Isolators only
You can see them on [link=http://www.sullivanproducts.com/MotorMountsMainFrame.htm]Sullivan's[/link] atalog page. Scroll down to "Flex Mounts."

Bill.
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Old 04-13-2005, 12:15 PM
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Default RE: Sullivan Vibration absorbing Engine mount

Hello; I hasve tried the Sullivan mounts. The "lord mount style" worked okay with an OS 40FP that I had in my Mid-star 40 then I used it with a K and B 40 in another Mid-star. It was satisfactory at the 40 size threshold, but I don't think I would want to use it with larger engines. Those little lord rubbers look pretty small to me for the amount of thrust they transmit. I have also tried the other Sullivan soft mounts that encircle the mounting lugs on the engine, they work great great too. I had it on my Enya 120 for years, no trouble at all. I also tried the Sullivan soft mounts where the engine bolts to a metal mount that is suspended by rubber bobbins on each end of the part the engine is bolted to. That one works great too although it makes for a long mount, it holds my Laser 100 in my Taube and works great.
\
Lately my LHS has down-sized and I can't find any of these Sullivan products locally, so I have been using the Dubro soft mounts just about exclusively. I like them, even though they are harder to find and are quite expensive. I think they help to protect the airframe from damage caused by vibration. After all just about every engine in the world is mounted in a vibration reduceing mount, our engines should be able to benefit from the soft mount.
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Old 04-14-2005, 05:06 AM
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Default RE: Sullivan Vibration absorbing Engine mount

check out the vib mount by Gator; www.gatorrc.com/
look great for 90+ four stks

regards
Dr R H malik
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Old 04-14-2005, 07:45 AM
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Default RE: Sullivan Vibration absorbing Engine mount

That Gator mount looks sharp....

appreciate all the info...

but time to be subjective..
or a .91 -.100 size 4stroke is it worth it to spend $35 on a mount

I'm also curious about wieght compared to a regular mount

Opinions?
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Old 04-15-2005, 01:14 AM
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Default RE: Sullivan Vibration absorbing Engine mount

It really depends on how 'expensive' is your machine; on a trainer type airplane, with std servos, you may get away with regular mount. However if your plane is $400 - $600 and you are using high end digital/coreless servos and a top-end Rx then investing on $35- $50 on a good vib mount makes sence.

Also i think Bill advised me couple of days back" ....vib mount is a good idea for FS120, recomended for FS 140-150 and is mandatory for FS 180..." (FS = four stk)

I am runing an OS FS 91 on my 3D laser with a regular mount, since viberation is not a big issue on this size engines.

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Dr R H Malik
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Old 04-15-2005, 09:39 AM
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William Robison
 
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Default RE: Sullivan Vibration absorbing Engine mount

Doc:

The word I used was "Required" on the 180, but other than that you've got it.

My US 120 with the big Saito takes a servo out every three to four hours. it has the stock metal engine mount. The plane is down now waiting for a new servo on the rudder.

And it should also get a soft mount. Four servos more than pays for the mount.

Bill.
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Old 10-05-2005, 05:19 AM
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Default RE: Sullivan Vibration absorbing Engine mount

Hi Bill
I finally got a new Saito 180 GK, boy oh boy....looks cool. Checking the sullivan site; http://www.sullivanproducts.com/Moto...sMainFrame.htm
it seems that dyna mount S343 is intended for four stk upto 150. Shall i go ahead with S343 for my 180 GK? or you reckon the vibs from Saito 180 could rip the rubber out from the mount??
These mounts have the rubber bounded into the side beams, what if they eventually come loose. Dubro type mounts, with rubber grommets in the back of the beams look better, but they would be heavier and longer (fire wall - prop drive distance)

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Dr R H Malik
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Old 10-05-2005, 08:07 AM
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William Robison
 
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Default RE: Sullivan Vibration absorbing Engine mount

[b]Doc:

With the Sullivan a rubber failure lets the engine fall out. With the Du-Bro the engine just rattles, can't fall out.

The rubbers in the Du-Bro mount can be replaced, rubber failure on the Sullivan means a new mount.

Draw your own conclusion.

Bill.
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Old 10-05-2005, 03:41 PM
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Default RE: Sullivan Vibration absorbing Engine mount

This one has not fallen out and I don't think it will.
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Old 10-05-2005, 04:00 PM
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Default RE: Sullivan Vibration absorbing Engine mount

The Dave Brown isolator mounts are pretty good. Take a look.

Ive used both the old backplate style and the beam (MK style) mounts.

Bob

http://www.dbproducts.com
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Old 10-05-2005, 07:32 PM
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Default RE: Sullivan Vibration absorbing Engine mount

I used the Sullivan type backplate mounts on .61 size pattern planes in the late eighties and early nineties with good success, although a limiting nose ring to contain movement at idle was necessary.

Since then, I have gone on to use the Sullivan Flex mounts (backplate type) on two Webra 120s, two Thundertiger 120s, a K&B 1.5, and an older OS FSR 61. Never had a rubber mount fail. The mounts are much larger on the 120 size, like close to 1" in diameter.

Some of these installations may "rattle" a little bit at a slow idle, but reduce airframe vibration and certainly noise.

Clair
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Old 11-29-2005, 12:13 PM
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Default RE: Sullivan Vibration absorbing Engine mount

Doc................This question from Canada I came across this thread after I made a search. I'm putting together an ARF CG Ultimate 10-300 bi-plane .60-.90. I will be installing an Saito 1.20 4/s. The ARF is supplied with an engine glass mount (plastic). I am a little bit concerned about vibrations. Servos are Futabas 9202/9001. The Du-Bro mount that is suggested for 1.20 is on the heavy side. As I understand that metal mounts transmits more vibrations than glass mounts. I keep reading and hearing conflicting opinions, to the point that "who's to believe ?". What it amounts to is to the safety for the people around us, property and the aircraft. People first and aircraft second. I wish to know what's best for a plane/engine this size in regard to engine mount. Flyers who are flying 3D with engine this size should know better what the Pros/Cons are, or pilots that are flying scale. I have a Waco YMF 1/6scale with a Saito .91 and have no problem with vibration, but the engine is mounted on hardwood rails and wood softens vibrations.

Will welcome suggestions.
Charles.
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Old 11-30-2005, 02:55 AM
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Default RE: Sullivan Vibration absorbing Engine mount

A few years ago I was doing a low pass.

I had a old Global Skyraider and I was getting lower each pass.
Finally I got so low that I struck the propeller.

The engine kept running but with a horrible sound.
I brought it back around and found I had lost 1/2 of 1 blade.
The Dubro engine mount did its job.
I had to replace all the rubbers in the mount.
The engine was just wobbling by hand after landing.
You could move the engine 1 inch in any direction.

I would say go with the Dubro.
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