Anybody have a drawing of an O-320/O-360 dynafocal mount.
They are the same are they not?

Paul Lamar

David Leonard wrote:

Paul,

It depends on the specific dash number of the engine.  Could be

either

a

type 1 or type 2 dynafocal (most are type 1) or even a conical

mount.

If

you have a specific engine in mind I can look it up.

Dave Leonard

I was hoping there would be a common dynafocal mount that fit most
O-320's O-360's.

Paul Lamar

Here is what I am thinking about. Use Royce's idea of milling down
the front end housing to save 80% of the weight. Use just the cast

iron

hardened wear surface. That is about a 36 pound weight saving right

there.

Cast a new aluminum water-jacket/water-pump-housing/front-cover all in
one piece with built in dynafocal mounting points.

This would make it real easy to bolt
a rotary into almost any airplane. MecanAir is doing something similar
but they are not selling the front cover. To my way of thinking this
is a mistake. The only way the market for a certified aircraft rotary
will ever develop is if there are a bunch of experimentals airplanes
out there flying with rotaries. The way to do that is make it easier
for people to install rotaries in experimentals.

I don't have the resources and time to pull this off.

Paul Lamar

 Terry Adams wrote:

A ready made dynafocal mount is a great idea.  But, am I missing

something?

My Thorp T-18 has a dynafocal mount, and when John designed it he put in
down thrust and side thrust to compensate for the rotation of the

propellor.

When I built my engine mount for my rotary I reversed the side thrust
because the propellor turns the opposite direction.  Tracy which

direction

does your propellor rotate?  and don't most airplane designers build in

side

thrust?  If you make a new casting of the front are you offsetting it by
some amount - but how will that compare for different designers?

Terry Adams

Hi Terry,  Good observation. I have a left hand prop and I use no offset at
all. The rudder trim tab goes on the opposit side as the Lyc powered RVs but
beyond that there are no big differences in how the plane handles.  Only
possible consequence is I may have to use more rudder to compensate for
P-Factor on takeoff.

Bill Hughs RV-6 has a rotary with an engine mount that bolts right up to the
stock Dynafocal mount but it moves the engine forward a bit.  CG is at
forward end of limit and required cowl lengthening. Not sure what was done
with the offset.

Tracy Crook
tcrook@rotaryaviation.com
www.rotaryaviation.com

 
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