----- Original Message -----
Sent: Thursday, August 23, 2007 9:34
AM
Subject: [FlyRotary] Re: engine
mounts
Jerry,
First of all, nice looking work! Second I don't think that there is
anything wrong with either mount. The thread here started with a question
about a mount that would stay together when the prop shed a blade. This is a
problem I really think the will just leave you SOL. If you design the mount
strong enough to handle that one senario it will be overweight for everything
else!
Bill Jepson
-----Original Message-----
From: Jerry Hey
<jerryhey@earthlink.net>
To: Rotary motors in aircraft
<flyrotary@lancaironline.net>
Sent: Thu, 23 Aug 2007 5:42
am
Subject: [FlyRotary] Re: engine mounts
In a message dated 8/22/2007 7:57:15 PM Pacific Standard Time,
Lehanover@aol.com writes:
I would (will) go with the flat plate. All of the pan bolts are
involved. Four Lord style mounts involved.
Compact and uses the engine block for added stiffness. I will include
the nose gear in my mount to reduce fire wall complexity.
Possible oil control benefit.
Lynn E. Hanover
Lynn,
Well reasoned, but it you use a slightly changed version of the Shertz
mount like Jerry Hey is now making the mount uses the bellhousing bolts and
fits between the Psru plate and the engine. Using two large lord mounts and
that system I believe it's a toss up. I really don't think you can really
plan for this though unless you always fly high and carry a 'chute!
Bill Jepson
I have not used that design in a long
time. The S-beam now is bolted to the pan flange using eight pan
bolts at the flywheel end. It is easier to install and does not involve the
PSRU at all. I don't think there is a strength issue with either
type of engine mount. Here are two pics just shot this morning of a
RV7A engine mount under construction. At this stage the pan flange
(less the pan) is bolted to the S-beam. The same bolts are later used to
attach the S-beam to the engine. This engine mount is asymmetrical, it
is extended on the exhaust side to provide clearance for exhaust and is
shortened on the cool side to provide room for a cool side rad.
Jerry
.
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