Drawing of a dynafocal mount.

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

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

Good question. I built my RV6 with no offset in the mount. I wonder how
much difference it makes, maybe I am losing a little top speed? It flies
straight at all speeds, no unusual rudder inputs needed.

Chuck Dunlap


 
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