RV-6 eng mount for Mazda rotary engine

David Carter wrote:


I'm filling out the "RV-6/6A Special Finishing Kit Order Form" - to

be used

by those NOT buying the Lyc from Van's.  On the back it shows 3

types of

engine mounts that are available:
    - Dynafocal 1 - lines from rt & left converge about center of

fwd rt

cylinder (looking down from above engine)
    - Dynafocal 2 - lines from rt & left converge at front of

crankshaft

(same view from above)
    - Conical - Holes parallel (same view from above)

I'd like to know if one of these three is easier to modify to mount

rotary

engine than the others;  or, are there  pros and cons for each?

David Carter
RV-6, Nederland, Texas

It is easier to start from scratch. Save the money and don't buy
the mount from Van. Jerry Hey builds a very nice and strong mount.
If that is not possible Jerry can start with any of them and cut off
what is not needed. In that case buy the conical as it is probably
the cheapest.

Paul Lamar

No need to pay for and cut up a complete mount.  The business that

supplies

engine mounts for Van's is in Tacoma, Washington.  You can get a partial
mount that can then be added to as required for the rotary.  You want to
get the mount with the firewall frame, fuselage mounts and landing gear
mounts all welded together.  Brian Trubee can talk about this more in
detail as he built up his RV-4 engine mount this way.  He powder coated

it

when he was finished and it looks great.  I can't remember the name of

the

motor mount builder in Tacoma off the top of my head ..Brian? ..anyone?

Mike McGee, RV-4 N996RV, O320-E2G, Hillsboro, OR
13B in gestation mode

This is where Tracy Crook gets his engine mounts from.  Anyone else had any
experience with them?

Greg


If you are speaking of the Conversion Concepts mount Tracy has on his RV8 Tracy has
yet to fly this mount. IMHO the mount is defectively designed. Build a balsa or
welding rod model and see for yourself. There is no lateral bracing.
Also it is very expensive as you are paying for a NC milled chunk
of aluminum sandwiched between block and oil pan that is totally unnecessary 
as the rear rubber mounts in this configuration have very low loads.

Paul Lamar

 
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