> > >Lets take a little poll.
     > >
     > > What do all you people out there need the most in the way of engine
     > > parts
     > > to get you up and flying?
     > > Paul Lamar

     "bob.kaufmann" wrote:
     >
     > I honestly don't know.  I have just bought a cosmo 20 B and It hasn't even
     > been delivered yet and all you guys talk about is a little this and a little
     > that and hell, I'm in the beginning and nothing makes sense.
     >
     > Bob K--

     What is it you want to know Bob.

     First you have to decide turbo or not turbo. Depends on the HP you need
     and if you want to cruise at high altitude.
     Next thing you need to do is make foam mock up of the firewall forward.
     Try to use the stock cowl if there is one as that will save a lot of work.
     Just ask if you need dimension info on mufflers or any other parts.
     Motor mount should come last.

     What kind of airplane are you building?

     I'll do some 3D's for free for you if you think that will help you
     make up your mind.

     Paul Lamar

     Hi Bob,
     My suggestion would be to get the Racing Beat catalog - quite an education.  Also, study Paul Yaw's web site on how a wankel works (http://www.yawpower.com/techindx.html).
     Ken Powell

Paul Yaws web site is very good but it emphasizes average HP over a range of RPM's
which is not applicable to an aircraft engine with a fixed pitch prop. It is more
applicable to a road racing car with a limited number of ratios in the gear box.
The CVT transmission now used in certain cars will change that situation by making
peak HP more important in cars.

Ironically his emphasis on the use of a flow bench is in conflicts with
his contention that flow velocity is all important. That is because a flow bench
measures steady state flow and not the total mass of air ingested in a typical
dynamic intake cycle. You can't have it both ways. The larger the port
the more the flow but the lower the velocity. Using a flow bench there is
no way to know what the optimum size of the port might be. The dyno is the 
final word. That is why I advocate taking Mazda word on the HP generated
by the ported 1991 Lemans winning engine.

Paul Lamar
 
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