I also had some time to update my KIS motor mount model.
 The 3/16 balsa tripods were strong enough to bend and twist the
 3/8 ply firewall so I cut out another firewall from 3/4 pine
 and glued the 3/8 ply firewall to that. That stiffened up the
 whole works giving me more confidence in the double tripod
 motor mount scheme. If you make one of these use 3/4 ply minimum
 for the firewall. I also redid the model of Tracy's redrive to look
 more like the real thing. Could not find  1 1/2 dowel for the redrive

model

 so had to laminate a couple of pieces of hard wood together and
 turn it on the lathe. Much harder to do than say with only a three jaw

chuck.

 Next addition will be a scale turbo charger. Just for fun as I already know
 it fits fine in the full size mockup.

 BTW these rubber bushing are 29 inches apart center to center to reduce
 torque vibration transmissions into the airframe. My goal is luxury
 car type comfort, noise and vibration :-)

 Somebody also mentioned a worry about neoprene temperature resistance. You
can
 always make your own rubber bushing out of 1/8 thick red silicone rubber
sheet
 available from AC Spruce and McMaster Carr. Cut out a bunch of
 rubber washers and glue them together with red RTV silicone adhesive.
 Copy the Barry design. Should be good up to 400 degrees.

 Paul Lamar

Paul,
The model is very informative. You said 1/4 scale -- right? That means your
"firewall" is only 9" across, byabout 6" deep.  I just printed out a scale
drawing of the firewall to start on a model of my own.  Now I need to get the
overall dimensions of the motor (a past post) and scale a block for the
engine.

Great idea for determining how things might interact.

Bill Schertz
KIS Cruiser # 4045
Engine and redrive on order.

The motor is about 12 inches wide 14 inches high and about 20 inches
long from Tracy's redrive 1/2 inch thick plate to the water pump pulley.

Paul Lamar
 
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