Paul flew his airplane down to SZP so I had an
opportunity to take some pictures.
Paul's unusual prop design is wining at Reno in
the biplane category so far. I suspect it has
something to do with a reduction in cooling drag
as Paul's air intake scoops are rather small
for a 115 HP engine. He uses four small individual
exhaust ejectors one for each cylinder hidden in the
cowl to increase cooling air flow. Typical of Paul
as he does not reveal all his secrets :) I
occasionally
have to make some outrages statement and watch his
facial
expressions :)

Paul is also the designer of Klaus ignition system
and electronic 555 based fuel injection system.
We had a long talk about a lot of things and he is
helping a friend install a rotary.
He prefers the CMOS version of the 555 because it
does not spike the power supply like the traditional
TTL version does.

BTW for all you electronic types out there I would
like
to buy a CMOS 555 PWM controlled electric fuel pump
controller.
Paul is using a circuit like this to control the
fuel
pump pressure on Klaus'e EFI system.  It would
eliminate those $130 fuel pressure regulators and
the
return fuel flow plumbing along with all its warts
and problems. It would also control the fuel
pressure more
accurately. You could use a Free Scale 100 psi
differential
pressure sensor to control the pulse width out of
the CMOS 555
in reference to the intake manifold pressure.

More on this later if anybody is interested.

Paul Lamar ...No rotor no motor.

Paul
I have looked into this concept quite a while ago. It
seemed to me that the pressure sensor would be too
expensive. I looked at the Freescale units and it
seemed to me that it would be very unsafe to use a
plain rubber hose with a plastic barb fitting in the
pressured fuel side. The better fitting would be 1/8
NPT I think, and metal body sensors were pricy. Let me
know what you think might be the better pressure side
interface. Maybe an O ring style?
regards, Robert

Yes I think that might be a problem. Perhaps we could make
up a mechanical device that would isolate the fuel from
the sensor. Here is a sketch of one idea that comes to mind.


Paul Lamar ...No rotor no motor.

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