Quite challenging squeezing it all in.
The high power rotaries tend to have bulky intake systems. The only cooling
under the cowl is the inter-cooler. The water and oil cooling are going in
the back fuse,
I built a 2 rotor turbo with a similar set up.
-------------------------------------------------------
If we can run methanol at Reno (and some say we can) then we can do away
with the inter cooler. That gives me more room on the right side of the cowl
for a cooling system. 1400 HP stuffed into a legacy cowl
I spoke with a highly experienced Lancair Reno racer and he had a few
suggestions.
Due to the small diameter of the aft fuse there is a tail flutter problem.
The torsional stiffness of a tube is proportional to the diameter to the
fourth power.
2 feet would then be 16. The Glasair fuse is more like 3 feet or 81 or FIVE
TIMES STIFFER!!!
Consequently one must wrap carbon fiber around the rear fuse on the Lancair
to stiffen it up.
The other draw back is used legacy's are going for about $200K. A little
rich for my blood. Glasair retracts are half that.
The other thing I talked to him about was engines. These guys just don't get
it!
They have no idea of how robust a rotary is. They think they know all there
is to know about piston engines but when you ask how many G's a piston
experiences when it stops at the top of the bore they have no idea.
I get angry talking to them some times. If they had some brains they would
educate themselves on the rotary and physics in general.
These Reno piston engines frequently don't make it through a Reno weekend.
There goes $50,000 (or much more) out the door. These engines totally
destroy themselves in the hand grenade mode.
I would never in a million years attempt to design this without Rhino 3D.
These high power rotaries have bulky intake systems. It takes a big pipe to
flow 1400 HP worth of air.
Paul Lamar
Hi Paul,
when we turbocharge the induction, is it still a good idea to use tuned
inlet length, or does the turbo change all that?
Dave in Perth
It still functions. You get more boost over and above what the turbo is
doing.
The 3rd gen RX7 and stock 3 rotor was tuned and turboed however they were
not high power in the sense of the TTC engine. The 3rd gen was only 280 HP
and the stock 3 rotor was only 350 HP.
Paul Lamar
Paul,
When you start getting the boost levels above about 10 psi, the runner
length effects start to go away and you can make good hp on a short runner
log manifold. Works for race motors, but if you are in a turbo normalized
mode, you want to be back to tuned lengths for cruise efficiency.
Larry Childs
We don't use no stinking turbo normalize :-)
We go all out for 40,000 feet :-)
Paul Lamar
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