The LeMans had the intake pretty much straight with only one 30· (?)

bend.

If you start to do more bends like Jerry's Russel application the

efficiency

must go down for the more work the air needs to go around the bends.

When

you have to do different bends for for/aft rotor you will also have
different flows even if the tubes are same length. How do you

compensate for

different intake tube shapes due to bends in the tubes.

Thomas J.

OK I have no idea. I guess the larger the bend radius the better.
I agree but we don't have the room for 16 to 18 inch straight runners.
Perhaps in a helicopter.

Paul Lamar

Thomas,
Practical experience has shown that smooth curves have very little

effect

on flow. There is probably a slightly higher effect in a rotary due to a

higher

average flow than a piston engine but not much. The manifolds that have
worked for Mazda are very similar to piston manifolds with a slightly
larger diameter. Many of the tuned intakes on new engines are very
curved. There is some loss of course, but usually the manifold can flow
more than the engine can take anyway. For absolutely maximum flow
straight intakes are best but only if they fit in your cowl!
Bill Jepson

Jerry,
I had the same concerns as you have on the DIFFERENCE of the two intakes -
it may not be worth worrying about, but for myself  I would go for the
intake with the same lengths, such as Paul's last design.
I played with different designs ( on paper) and came to up with the same
outcome as Paul. At least the height is reduced, the bends are minimum and
their the SAME LENGTH.
I'm wondering if you could bring the inlet from the side rather than the top
?
BTW that discussion on inlet diameter/length was very informative - thanks
to all concerned. Even though there may be disagreement on diameter, I at
least know how things are worked-out.
Does anyone know the chamber volume area 12A,  if the 13B is 40 cu. ins.
George (down under)

 
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