Michael McGee wrote:

Doing some dreaming..

What do you guys think of the viability of a front cover cast

into the form

of a standard Lycoming dynafocal-1 mount?

A loose collection of my thoughts so far:

I think it would sell well enough to get the price under $500

for the

kit.  I was bs-ing with the local rotary engine builder the

other day and

he showed me a very nice third-gen oil pan that was cast as a

replacement

for the stamped steel original.  The reason behind the pan is

another story

but the casting work looked great (from this engineer/

non-casting expert's

perspective anyway).  He insists that he has a casting guy that

is capable

of making what we need if I can get him a proto type part.

The thought here is a Dynafocal mount would open up more of the

market to

those who would CONVERT to rotary engines (like I'm doing) if

it didn't

require changing the motor mount.  I realize that we can make a

decent

mount without it and use something like the Schertz beam or the

bell

housing.  The Dyna-1 mount would be an effort towards more of a
standardization for aircraft use.

I've been toying with this for the last couple of weeks and

while it needs

some serious planning for water pump and alternator

accommodations, I've

got a bit of it worked out.  As expected it isn't as easy as

originally

thought.  Of course if it was it would already be done.  It

would be

supplied as a package with water pump and alternator mount.

This does require using a remote water pump like what Paul

created.  It

gets the pump down lower for better performance.  If you use a

3rd gen

water pump with its own remote pump housing it could be mounted

co-axially

with the crank and get rid of a water pump drive belt.  (3rd

gen pumps run

opposite direction to earlier pumps)

It also would require using the 3rd gen crank angle sensor

plate and

pickups.

There are enough bolts on the front end plate to hold it
together.  Additional reinforcements for the aerobatics crowd

would be

added at the oil pan-to-front cover flange and on the top from

the EGR port

on the center plate to the top of the motor mount/front

cover.  This would

probably be standard for the 20B motors.

-Could be that the sealing surfaces would be a problem as a

structural

interface?

-It would put the prop flange about 2 inches forward of the

Lycoming

installation.  However that would put the 13B c.g. about the

same as

the Lyc.

As an RV-4 owner the thought of a motor mount as compact as the

dynafocal

mount is appealing.  Yes, I know it has been done on an RV-4
otherwise.  I'm looking at future possibilities.

Okay, enough for now, you guys shoot holes in this for me....

Mike McGee, RV-4 N996RV, O320-E2G, Hillsboro, OR,

jmpcrftr-at-teleport.com

13B in gestation mode, RD-1C, EC-2.

Joseph M Berki wrote:

A dynafocal type mount would benefit narrow airframes like the RV 3 and
RV4, Long EZ.  A concern that  I wonder if Mistral has addressed, is
hanging the weight of the engine and gearbox on the front end

housing.  How

do the loads affect the engine "block" during flight and flight

maneuvers?

Joe Berki
Limo EZ

Interesting Mike. Do you have photos of the cast pan? Also, your site,
jmpcrftr-at-teleport.com doesn't resolve in DNS.

--
-dave
mailto:dave@arb.net
http://arb.net

The cast pan isn't mine.  I'll see if I can get a picture of it and put it
up on my web sight.

jmpcrftr-at-teleport.com is my email address not a web site.  My
rotaryengine web site is a cob web and preliminary at best.  No pictures of
the mount.
http://home.teleport.com/~rotaryrv4/

Mike McGee, RV-4 N996RV, O320-E2G, Hillsboro, OR
13B in gestation mode, RD-1C, EC-2

 
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