Marc Wiese wrote:

Marc Wiese
Great pics. Like the shape and profile of the assembly.
That's the set up I am using on the 20B and one of my FD 13Bs

(the

automatic). I have the same bellhousing and starter arrangement.

The

adaptor plate could use some ears for motor mounts---
Bulent-
What was TC's upcharge for the new longer shaft? Did you use the

ring

gear from the cosmo (if so, how did you adapt it) or the earlier

one

Tracy recommends?
Marc Wiese

Thanks Mark, since my installation is a bit different, I did not

want to

bore everybody with it. But for now I have found few things

different:

The engine/bell housing meeting surface has two 1/2" dowels which I

like.

The bell housing brings the prop 3" further - good for a pusher

plane

I can use the stock starter without modifications.
The cost for longer shaft was upset by not getting adapter plate, so

it

was

a wash.

Tracy's damper plate will not fit Cosmo flywheel, and standard

flywheel

as

recommended will not work with my starter. So I made adapter plate

from

1/8"

steel to be able to use the standard damper. (BTW I have as new

flywheel

for

sale that will fit Tracy's RD.)
At the moment I don't want to deal with extra mounting points. I use

engine

mount from Conversion Concepts. Yesterday I checked the CG of the

engine

as

you see it on the photo. Without alternator, water pump etc the CG

is in

the

middle of the rotor housing closest to the prop.
Bulent

Bulent,
Did you consider removing the ring gear teeth and welding them on the
earlier wheel that fits Tracy's dampener? (this can be done as a repair
to the ring gear after starter damage to the teeth....) I know the auto
teeth are wider for that starter. In any case, I would like to see a pic
of that adaptor plate if you have one. Keep us informed, some of us
won't be bored!!!

My only concern is that the redrive and the bellhousing have no support
except the housing bolts (incl and the two dowels), and the starter
straddling the housing and engine. What do you think of this, Paul?

[Marc Wiese]

Its plenty strong enough. Stronger and stiffer than Tracy's setup.

Too bad there is not an unlimited supply of auto tx bell housings.
In another year or two there might be enough of a demand to justify
a casting.

Paul Lamar
 
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