Randy here is that stuff on the Ellison carb.

----------------------------------------------

Here is some stuff from back in the days we were considering
incorporating the Ellison idea into our stock Teflon slide
throttle. What discouraged us was the cost quotes we received
on the laser cut holes. If you can find someone to cut all the holes
this is a real good way to go.

Paul Lamar


Hi you Guys

Here are some pics of the spray bar of the Rotec equivalent to a
MP3A.
I can dissemble the regulator and post some pics if anyone is
interested?
Nicely made and the seals look good has a separate idle fuel
adjustment as
well.

Clive

Looks like and exact copy of the Ellison.

Price is $976 USD less shipping.

http://www.rotectbi.com/USAOtherprices.html

All you need for a P-port is two :)

Paul Lamar


So far Slide throttle with EFI seems cheaper to me. 4 injectors
$400,
slide throttle kit $175, teflon $40, Injector controller (?)
well, that
is the only varible left. There's $1400 left for injection
control. What
do you think your EFI system will come out at? $100 per board?
Another
$100 for MAP sensors? Every system needs fuel pumps.
Am I missing something?
C. Smith

I was joking Craig :) Obviously nobody is seriously considering two
Rotec's or Ellisons as I recall they are about the same price.

Well the 555 system is definitely cheaper but it has not run yet.

http://www.rotaryeng.net/simple-cheap-555.html

Yes Klaus has run one but I am not privy to the schematic.
Yes the Megasquirt will work.
Tracy's system is pushing $925 but you only need one.
Yes it has two computers for redundancy.

I was thinking of incorporating the Ellison principle in the
slide so not much money would be added. Just a long brass tube
with a bunch of tinny holes and a lever to rotate it.
Any low pressure fuel pump would work.

It could be retrofitted to current slide throttles.



Paul Lamar


 Paul

 Any words of advice about the Revmaster?
 http://revmasterautomotive.com/revmasteraviation/?p=206  One per
 rotor required.  This seems like a very simple device and works on
 very low pressure.Dan F


 Oops!  I meant the Aerovee, as it has larger
 outlet.http://www.aeroconversions.com/products/aerocarb/index.html

 Dan F

 I have no idea. I can't even find the diameter of the throat on
 the web site. Just a lot of BS. Perhaps somebody knows how
 big it is :)

 It appears to be a strictly gravity feed device.
 That means to use it with a fuel pump you need to
 have a header tank very close to the carb with a return
 fuel supply to the main tank. I suspect these super low
 pressure carbs may be subject to vapor lock.

 Paul Lamar

After not getting very far with the MIKUNI round slide carbs, I decided to
give the Aerocarb a shot.  Performance turned out to be really good.
Manifold pressure at WOT is generally running at less then one inch below
atmospheric.  This is with the 35mm size on the 12A based single rotor.
Mixture control seems to be very sensitive.  My set up on the test stand is
with a pressure regulator set to 2psi.  Being a very simple device, there
are some very peculiar handling procedures required.  Since there is no
float or diaphragm, fuel flow has to be manually shut off when the engine
is not running.  For starting, fuel can not be opened until the engine is
turned with the ignition on, otherwise it will flood immediately.  Which
gives a starting sequence like -crack the throtle, turn on the ignition,
push the starter switch while opening fuel flow in pushing mixture control
to full rich.  As it looks now, I am going to use it in the airplane in the
same way.

FWIW

Richard Sohn
N2071U

Richard


Thanks for your info, just what I was hoping for!  For my single rotor
the 38mm size is rated 125 to 160hp (planned 130hp).  In response to the
apparent small ID's the web site says the throat size is a "perfect flow
passage" ,  which I take to mean very smooth transitions between
diameters with laminar flow.  Your results show they know what they are
talking about.  :)

Dan F


Is it 35 mm or is it 38 mm?

2.76 square inches for a 1.875" (47.6 mm) diameter runner used on
a p-port 7500 RPM 250 HP 2 rotor. Half of that is 125 HP for
a one rotor 13B p-port.

We used a dual 50 mm Weber on the 13B p-port 250 HP
dyno engine. We did not measure the pressure drop.

A p-port 12A at the same RPM should put out 230 HP.
Half of that should be 115 HP. One inch below 29 inches
is 28/29 times 115 HP or 111 HP in theory.
What RPM are you running Richard?

Only 1.77 square inches for a 38 mm (1.5 inch) diameter runner.
That certainly is remarkable performance.
Seems a bit small to me.

Paul Lamar