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.

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

Paul Lamar

Robert,

The power requirements for my aircraft are about the same and I opted for a
12A with a 2.85:1 reduction ratio.

It has been suggested to me the 12 A revs a little more easily than the 13B
(probably because of the smaller rotor) and has the 3mm apex seals.

The engine is very similar, same bolt pattern etc. but has the seals in the
Rotor housing - as does the RX8 I believe.
I'd expect about 140 hp - N/A.

There is a slight weight savings compared to the 13B, but not much.

Some builders(of the Vision) are opting for the 13B, but I don't think I
need 180 HP +, besides the parts are a little cheaper for the 12A.

George (down under)

 
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