George Lendich wrote:

Paul,
This is a fairly close mock-up  drawing of the Vision firewall
with
a

Rotary engine.

I've got less than 3" at the bottom to do my Radiator- I figure it
might

fit in if I extend my cowl down below the firewall.

OR I could put it on the side.
What do you recommend?

Also the bellhousing in drawn in to show how it fits on the engine
with

mounts - this is at 25" approx.

Look OK ?
George (down under)

Not a lot of room. Looks like the best place for the rad is along
side the

engine

on the cool side. Got any pictures of what a Vision cowl looks
like?
How far is the prop flange from the firewall?

Paul Lamar

Paul,
The vision is plans built, so the cowl can look like it needs to
look
to fit
the application!

Prop flange to firewall = 36"

One interesting thing about the Vision, although the plans are
limited to
300 lbs firewall forward, the designer will calculate a spar
movement
for
heavier engines. The worst case scenario of 400 lbs is a forward
movement of
the spar ( wing) of 4". However I'm trying to get the weight to the
original
design limit. Also the engine mount will be designed for best Cof G
at the
time of engine installation.

The vision is very similar to the Kis aircraft or the Vans in looks
-
I
could if necessary change the firewall size as well, but getting
into
unknown territory at this point in time. I could speak to the
designer on
this however.

How many of you kit guys can do that?

George (down under)

36 inches long is going to be tough. I think you need at least 39
inches.

Paul Lamar

Thirty-five inches will just clear the pulleys.   My Tailwind is 38
inches and that leaves a reasonable amount of room to mount stuff on
the firewall and work on the back of the engine.  Thirty-eight to
forty
inches is ideal.   More than forty, I am starting to look at larger
tubing for the mount and there does not seem to be any point if this
engine is intended to replace a Lyc. and the stock cowl is part of the
plan.    Jerry

I should have added that it is no big deal to use spacers between the
engine mount and the firewall  to move the engine forward to gain room
or to adjust the c.g.   I have seen formula one racers with spacers of
about 1.5 inches just on one side, presumably to help them turn left.
Jerry

 
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