George Lendich wrote:

Paul,
I was looking at the Kis firewall to day and took notice of the

Thrust

Line and felt if you needed extra room at the top, you could drop

that

thrust line 3 to 4 inches, if it was OK'd  by the

designer.
Just a suggestion!
George (down under)

Vance is the designer. What about that Vance?
IMHO the landing gear is not long enough :)

On the other hand some time Vance flips flops :) Quote!
"Paul - I have a problem understanding why you want a smaller prop

dia.

With the 2.85 reduction and the curves you have provided, the tip

speeds

are very

modest. Smaller diameter is going to have a perf penalty

everywhere,

and

most

heavily at static and climb."

Paul Lamar

All things in moderation. The thrust line on the Cruiser is not

carved

in

stone
but dropping it down without lengthening the gear would put the prop

dia

one would like with this size plane and power - in jeopardy for prop
strikes. Raising the nose gear height would probably involve

significant

(tho quite possible) hardware changes - Mains could rise by blocking
in the gear fuselage cut our. This is why I view the concentric

nature

of

the
planetary reduction a minor disadvantage - Our TR-1 with the Subaru,
and Ross box just shortened his prop tips with a slight drainage
depression out by the hanger, - Vance

Vance and Paul,
Sorry Vance, I was just thinking engine installation at that point in

time

and forgetting that the Kis is a KIT with all premade parts supplied. It
struck me at the time that the thrust line was quite hight compared to

other

designs.

Would larger diameter wheels help or would that also add to other

problems.

One thing I know is the problem of changes to existing designs - been

there

done that, on other projects.
George (down under)

    "thrust line quite high compared to other designs"?? What other designs?
the
location is quite classic for flat six and four aircraft engines and the
line relative
to the windsheild is probably within an inch or so of all RVs, Cessna Piper
etc. Vance

Not an RV4 for sure  Vance. Tracy can clear an alternator on top of the
engine using the stock RV3 cowl. There are other RV's out there with
just as much room on top. Now on Lancair 320, 360 and legacy I'll probably agree. 
The Tailwind is also pretty tight.

Paul Lamar
 
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