Mr Robert Geis wrote:

Hi all,

I'm planning to use a 13B engine in a Long EZ

plans

built airframe.  Will this engine be overkill for

this

airframe as the designer only reccommends 108-115

Hp

Lycosaurus engines?  Or will the extra HP allow me

to

run at a lower RPM for more economy with the
appropriately designed prop?

I don't think I want to consider a lower HP 12?

engine

since the 13B is much better supported.

Any ideas are certainly welcome.

Bob Geis
"Livin the Dream" in Iraq

 A 13B would be perfect for a Long EZ Bob. Most
people put at least
O-320 in them and a lot have O-360's. To really get
the benefit
of low RPM cruise a variable pitch prop would be
perfect.
Meccanair PSRU will accommodate a relatively low
cost hydraulic
variable pitch prop although I am not sure they are
available for
pushers.

Thank You Paul,

Not sure if I'll  go with a variable pitch, but what
methodology would I use to optimize a fixed pitch prop
with this engine/airframe combination?  Also I haven't
ruled out building my own prop.

BTW How's it going over there? You must me a short
timer about now.

Well, I've been short a few times  now but this time
looks for real, about 50 days left. Thank you for
asking.

Bob Geis

That is a good question. A lot depends on your intake manifold,
exhaust system and the amount of HP you are generating. Unfortunately
we don't have enough LE's flying to get you in the ball park.
We might have a few by the time you are ready to fly.

Paul Lamar
 
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