Jerry Hey wrote:
Paul, here is our MM Plate. We are very happy with its appearance and
in several aspects of the narrow plate we got LUCKY. For example,
when the engine is in position on the thrust line, the top tube of the
engine mount will clear the muffler easily. Secondly, the MM plate
is the perfect width and location to easily mount the oil cooler.
Brackets can be welded to front side of the tube thats forms the bottom
of Barry Mount. (Same tube that the engine mount space frame tubing is
welded to on the other side.)
We have bolted up Tracy's drive and have verified all of plate
attaching bolt holes. Everything is a perfect fit.
One thing to be aware of is that different starters have different
diameters so each MM plate is specific to a certain starter. The plate
shown was cut for a Mazda starter and the hole is too large for my
Mitsobishi starter. I was not aware of this until I got it home last
night.
Pricing: the MM plate with Barry mounts complete as shown in the
photos is $550.00. The wider plates will be an additional $50.00 because
they require a second set up in a different mill. (The mm plates can
be any width from 20.5" to 29.5" whatever the builder wants.)
Complete engine mounts will soon be offered. The universal fixture is
finished. Now I got to figure out how to use the thing. Jerry
They look great Jerry. If anyone is concerned with the stiffness it is a
simple matter to add 1/2 inch square diagonal tubing braces from
mounting bolts
to the nose of the PSRU. They are most likely stiff enough for all
but violent aerobatics.
Paul Lamar
I hate to rain on someones parade, but didnt Tracy say that mounting on his
PSRU this way was a bad idea, or did I misunderstand him?
John Slade
Cozy IV - wiring
With all due respect Tracy is wrong.
Old message on this subject:
------------------------------------------------------------------------------------
Subject: Front motor mounts.
Date: Sun, 03 Mar 2002 23:06:57 -0800
From: ACRE NL <rotaryeng@earthlink.net>
snips............
Jerry. You don't need drawings. When Tracy sends you the psru tell him
you don't want the stock adapter plate. He should credit you $100.
I will loan you mine since I don't need it anymore and you can use it as
a pattern to make your own with the starter on the side and the Barry
mounts built in. Your mill is much better than mine. Turn some aluminum
pilots on your lathe to align the two plates together. Then rotate
Tracy's plate to put the starter where you want it.
The hole saw was used to get a rough cut. I then used a boring head to get
the final starter pilot hole size.
Paul Lamar
Here are a couple more shots Jerry.
The torque load on the spacers and bolts between the psru and the
engine are less putting the rubber motor mounts on the plate. This is so because
the rubber bushings react the torque load from the prop. The torque
is doubled by the gear box so 400 ft pounds goes through the spacers
and the bolts into the engine if the rubber bushings are mounted on the engine.
If the rubber bushings are mounted on the plate on the other hand
the bolts and spacers see only 200 foot pounds of engine torque.
Therefor deflections if any will be half.
Paul Lamar
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The torque is not constant but prop torque pulses can be twice as high as this.
Also the thrust load goes directly into the motor mounts and not through
the spacers.
If deflection from severe aerobatics is a problem one can always
add 1/2 inch square 4130 tubing braces as shown in this picture.
Paul Lamar
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