Would it make sense to add enough flat area on the bottom (6 o'clock
position) to also allow a starter for pusher configurations or others

with

width restrictions?  Perhaps this might allow one casting to handle

all

configurations without adding too much weight.  Those using the lower
starter position could bolt up engine mounts in this location, and

just

cut

off the unnecessary sides of the casting.

Scott Gettings

Scott,
Good suggestion that a 6 O'clock starter position, as it would be
advantageous to some builders because of restricted space in the cowling.

However it would be difficult (if not impossible) with a Universal design
and the sides wouldn't be able to be just cut if as they are integral to

the

strength of the total housing - not only that, they are the engine

mounting

pads!!

Then again, Butch may have an option on this, I don't know.

I do know any extra area would add weight. George (down under)

Thanks, George.

Some pushers have enough width to use the side flanges on such a housing.
However others do not, due to a very narrow rear pylon or cowling areas.
In these pusher situations, the aft mounts have to be very narrow (about
13") or even a single mount.  Having mounting bolt holes at a 6:00 starter
and options nearby would provide for a simple mount in this area:  just
bolt it on.  There is plenty of room for the starter at 6:00.  I was
thinking that the wide sides of the bellhousing could cut be cut off
outboard of any structure needed only for the side mounts.

It appears the latest bolt hole/fin design might put more structure right
in the 6:00 position, which would certainly prevent putting the starter
there.

Scott Gettings

 
The AirCraft Rotary Engine NewsLetter.  Powered by Linux.
ACRE NL web site. http://home.earthlink.net/~rotaryeng/            
Copyright 1998-2003 All world wide rights reserved.