In a message dated 2/8/2006 12:38:59 PM Eastern Standard Time,=20 russell.duffy@gmail.com writes:

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Don't= get me=20 wrong, I hope to see lots of rotary engine clearly outperforming Lycoming=20= in=20 reliability, and performance, but I frankly don't think that day has=20 come. I'm rooting for Bill Dube's 6 port=20 intake, though.

Cheers,

Rusty= (someone=20 has to play the bad guy)

When I get around to building my airplane engine, it will be piec= es=20 for an early 13B 4 port, with seal rings in the housings. It will have a ver= y=20 nice Pport and manifold. It will be a struggle, but I think I need 200HP at=20 6,800 RPM with 180HP cruise at 6,000 RPM.

It will be tuned on a dyno, and the sheets available for all to see.

I don't see why I cannot have a dyno in the plane using a strain gage t= o=20 measure torque, just like the big radials had. I have most of a BD-4 kit now= ,=20 and as soon as we sell our big house

we will build a new (small) house in Florida (45 minutes north of=20 Sun&Fun) and that house will have a shop to build engines and airplanes.= =20

Once upon a time a friend had an MGB race car (yes it is even hard to t= ype=20 that line but people did race them) We got the Jaguar carbs homologated usin= g a=20 picture of a stock manifold clamped to the carb. It was done by cutting off=20= the=20 runners. Cutting them into 4 pieces length wise, adding wedge shaped scrap=20 pieces, welding on the flange from a Jag manifold, and finished it up with a= =20 needle scalier to make it look stock. I slicked it up inside and matched it=20= to=20 the head.

It ended up on the dyno, and I had to work that day (I was a cop) and=20 knowing the HP of that engine before the change, I wrote a number on the edg= e of=20 a shelf and put a strip of tape over it.

When I got home the troops were pulling the engine off of the dyno, and= =20 they were long in the face. What did you get? He told me. I pulled the tape=20= off=20 of the shelf. It was 148 HP. And it had good power everywhere in the=20 range.

I told him it would be fine. A California builder was claiming 160 HP f= rom=20 that engine and selling them like candy. My friends car was faster than the=20 factory car everywhere. It just occurred to me that I did the rods for that=20 engine. He was leading them around the track once and twisted the pinion sha= ft=20 in two. After the race the factory people were looking at the manifold.

So, you see that the bigger the HP number, the more engines you can sel= l.=20 California HP is smaller than Ohio HP. So, 148 Ohio HP is stronger than 160=20 California HP.

Actually peak power is not a big factor in racing, a broad power band i= s=20 more important.

If it won't do it on my dyno, it probably won't do it=20 anywhere.

Lynn E. Hanover

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