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Since there have been some recent discusions on motor mounts in the last couple
of days I am resending an old message so the new guys can see an alternative to
what is commonly being built.
Ken Powell
From: ken.powell#fnf.com
Sent: Wednesday, January 30, 2002 5:01 PM
To: Powell, Ken
Subject: Cantilevered RV-4 Engine Mount & weights
> > > Well, after months of rebuilding motor mount pieces and lots of
> > > input from the guys here on the list, I am finally finished with
> > > my RV-4 motor mount. Note that this mount is for a PP motor so
> > > I had a little more flexibility on the left side of the engine
> > > since there is not a 4 or 6 port intake manifold to make things
> > > more difficult. The advantages of this mount is that
> > > for a narrow single place or tandem aircraft there is much more
> > > room under the engine for radiators and exhaust; the value of
> > > this cannot be underestimated unless you have tried to fit all
> > > of this stuff in a 24" wide cowling! Pictures are attached.
> > >
> > > Ken Powell
> BTW, the original conical mount from Van's weighed 11 lb 6 oz. The
> new mount
> weighs 13 lb 3 oz, or 1 lb 12 oz more. Lot's of extra .75" tubing
> there!
> The engine adapter mounts weighed a total of 5 lb 12 oz. The
> lower mount
> weighed 2 lb 12 oz, the right upper weighed 1 lb 11 oz and the upper
> left mount weighed 1 lb 12 oz. The three adapter mounts were
> weighed together as well as individually to eliminate rounding
> errors. Note that the upper adapter mounts (on both sides) tie the
> front and rear of the engine together to eliminate extra loads on
> the tension bolts.
>
> Ken Powell
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