> >> Hi Bill,
>> I like the idea that the sliding block does not have the float valve
>> that worried you. If it worries you, then it worries me!
>> Does the Lectron have a float bowl?
>> Dave McC
>> >> Dave,
>> The Lectron has a conventional float bowl. The unique part of the carb
>> is that it uses a single, specially tapered central needle for all fuel
>> distribution. (idle to WOT) This is why I believe Pauls idea about
>> the Slide Throttle carburetor could be made to work. The only concern I
>> have for float systems is that they must be kept supplied with fresh
>> CLEAN fuel. There are many good filters, and running one is needed on a
>> carb system. You need to fly regularly to be sure the fuel doesn't get
>> old and produce "gum" by having the light ends evaporate off.
>> >> Bill Jepson
>> >> This system is easy enough to check on the bench.
>> You set it up with a typical head of fuel and
>> use a calibrated beaker to measure the flow as a function
>> of slide position. Same thing goes for the leaning valve.
>> >> One can always heat the slide plates to 200 F with
>> a hot air blower. I also have a vacuum pump that can
>> be used.
>> Paul Lamar
> > The two strokers even have a small electric coil around the
> venturi for heat. I have seen them for sale on ebay.
> The mixture control on the Aerocarb is extremely simple,
> maybe even less than $7. It is a needle valve with the
> seat bored into the case at the inlet fitting. It can rotate
> through a quarter arc (90 degrees) with a lever attached
> to allow 2.5" of movement. My vernier mixture control
> makes very fine adjustments.
> > Terry Adams
> > The simplicity is stunning! Can be easily retrofitted
> to our current slide throttle design.
> > Paul Lamar
> Paul,

Wouldn't it make sense to create a venturi on one side of the slide
throttle
housing? The venturi part may be as simple as an add on 1/2 thick ring
that slips between the manifold and slide throttle. That way you can use
the tapered central needle with its outlet emptying directly into the
airstream which IMHO is the essence of good fuel vaporization. A small
rectangular header tank could be put on top of the slide. Vapor lock
shouldn't be a problem with the tank close at hand. It could be heated for
cold starts and the rely on engine heat for operations. Ethanol ALWAYS
needs
preheat on cold days. About 10 watts I am told.

One challenge would be how to create a linear cam that can depress both
spring loaded needle valves equally and be in sync with the throttle
linkage. More complication.

DougFir

Why? None of the other sliding block carbs have venturi's .

A bit of heat will vaporize the fuel no problem.
My guess is 150 F.

Venturi's have aerodynamic drag.

What needle's? We don't have needle's. No needle's.
This is it. What you see is all you need.

Alcohol is your problem :)

Paul Lamar ...No rotor no motor.

Doug the only reason to create a venturi is if you need to pull _FUEL
UP_ like a standard carburetor does. The vacuum is needed to lift the
fuel the 1/2 to 1 inch from the float bowl. This is why your fuel level
is critical on a carburetor. Think of this system as a 32 ft/sec/sec
fuel injector system. Also the taper only WILL and already has worked,
you just need to control the cross-section carefully.
Bill Jepson


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