Revolution Pro Engine Mounting

[Dean Pappas]

Hi Matt,
You probably mentioned this, but at what weight wasn't the "L" enough ponies for today's schedule? 
just curious,
    Dean
 

Dean Pappas 
Sr. Design Engineer 
Kodeos Communications 
111 Corporate Blvd. 
South Plainfield, N.J. 07080 
(908) 222-7817 phone 
(908) 222-2392 fax 
d.pappas at kodeos.com 

-----Original Message-----
From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]On Behalf Of Rcmaster199 at aol.com
Sent: Friday, October 15, 2004 3:02 PM
To: discussion at nsrca.org
Subject: Revolution Pro Engine Mounting



Hi Dean, the Rev Pro's engine mounting is quite similar to what you described on Dr J. The early beams in the Rev Pro were fiberglass and vibration would loosen the engine bolts all the time. The fix was to epoxy the bolts in place which is what gary Kirby did on his.
 
The better fix was to use aluminum beams which is exactly what Andreas Gietz went to on mine. Blue loctite secures them well.
 
As far as isolation, the rear of the beams are secured through a set of fairly large (about 1"od) grommets (like servo grommets just bigger). The grommet is installed onto the firewall, and a through bolt secures the beam's back end (from inside the fuse). The front of the beams are secured with lords. Early Rev Pro's used a 3/8" Lord mounts but my kit has 5/8". The rear end of the beams does not seem to be as affected as the Lord mounting you used on the Dr J
 
Isolation with this rig is pretty good on the YS 140L that Gary is running. Gary and I added an extra ring at the nose, mounted vertically, and Gary has had no problems. I haven't flown mine yet but it's getting close. Weba 160 on mine. And BTW, the L isn't enough power for the present F3A schedules, but is fine for the masters schedules.
 
Matt

The one I had didnt used Lord mounts at the rear but had the firewall milled to accept some very stiff rubber isolators that sandwiched on either side of the firewall. It doesnt have a tie rod at the back. I didnt/dont run the mount, the beams with it were pretty iffy looking but mine was an early kit.

Dean Pappas <d.pappas at kodeos.com> wrote: 

Does someone have a picture of the Rev Pro setup?
Back around '91,  had a 9 lb-6 oz Dr Jekyll with a 120-AC, with the engine the motor mounted on two 6" long rails. The front of each rail had a 5/8" lord mount to the nose ring, and the back of each rail was tied to the firewall with the same lord mounts. The rubber bits were aligned fore-and-aft. The mount had a horrible resonance at idle. I can still remember Dean Kraus yelling "shut it down - shut it down" the first time I ran the engine up. It shook that badly. The fix was to put a strap across the rear end of both rails, and put a large screw in the middle of the strap that stuck back through a rubber bushing in the firewall. This forced the back of the mount to rotate, not wobble up and down or sideways. All of a sudden, it was a really good mount. 
 
What is done in the Rev Pro mount to keep the back end of the motor from wiggling up and down or sideways?
 
Regards,
    Dean

Dean, the beams are quite similarto what you described in the Dr J

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