Special prop to increase manifold pressure

Hi Folks!

Was there ever a prop modified with a trailing edge bump for the purpose of
increasing MP at the ram air inlet?

Faint memory is maybe Lopresti marketed a Hartzerll with a trailing edge
tab.

Thanks
Kent Felkins

In article ,
Fly wrote:

Was there ever a prop modified with a trailing edge bump for the purpose of
increasing MP at the ram air inlet?

Faint memory is maybe Lopresti marketed a Hartzerll with a trailing edge
tab.

I think Lopresti makes one for the Comanche or Twin Comanche. It might
"come with" a cowling.

--
Ben Jackson

http://www.ben.com/

Ben Jackson wrote:
: I think Lopresti makes one for the Comanche or Twin Comanche. It might
: "come with" a cowling.

"Holy cowl" or some such nonsens, I believe. Not sure I buy much performance
increase, but then again even 1/2" MP would be noticable

-Cory
--

************************************************** ***********************
* Cory Papenfuss *
* Electrical Engineering candidate Ph.D. graduate student *
* Virginia Polytechnic Institute and State University *
************************************************** ***********************

Fly wrote:
Hi Folks!

Was there ever a prop modified with a trailing edge bump for the purpose of
increasing MP at the ram air inlet?

Faint memory is maybe Lopresti marketed a Hartzerll with a trailing edge
tab.

Thanks
Kent Felkins


Kent,

I recall that this was available on certain Mooneys. An STC search
might turn up more clues.

Happy Flying!
Scott Skylane
N92054

"Fly" wrote in message ...
Hi Folks!

Was there ever a prop modified with a trailing edge bump for the purpose of
increasing MP at the ram air inlet?

Faint memory is maybe Lopresti marketed a Hartzerll with a trailing edge
tab.


You're memory may be faint, but it working! The prop is a Hartzell
with a trailing edge tab, specifically design to work with the air
inlet on LoPresti's Wholey Cowl (Comanche). They call it a
Sychro-Pulse prop.

Here's a URL :

http://speedmods.com/syncro-prop.htm

John Galban=====N4BQ (PA28-180)

THanks everybody for your replies!

Kent Felkins

"John Galban" wrote in message
om...
"Fly" wrote in message
...
Hi Folks!

Was there ever a prop modified with a trailing edge bump for the purpose
of
increasing MP at the ram air inlet?

Faint memory is maybe Lopresti marketed a Hartzerll with a trailing edge
tab.


You're memory may be faint, but it working! The prop is a Hartzell
with a trailing edge tab, specifically design to work with the air
inlet on LoPresti's Wholey Cowl (Comanche). They call it a
Sychro-Pulse prop.

Here's a URL :

http://speedmods.com/syncro-prop.htm

John Galban=====N4BQ (PA28-180)

I remember that prop, but don't think it was for a MP increase.. I think it
was to slam more cooling air into the cowling..

BT

"Fly" wrote in message
...
Hi Folks!

Was there ever a prop modified with a trailing edge bump for the purpose
of
increasing MP at the ram air inlet?

Faint memory is maybe Lopresti marketed a Hartzerll with a trailing edge
tab.

Thanks
Kent Felkins

"BTIZ" wrote in message news:Xmurd.164729$bk1.68505@fed1read05...
I remember that prop, but don't think it was for a MP increase.. I think it
was to slam more cooling air into the cowling..


From the website :

"On planes with the Wholey Cowl the SynchroPulse Flaps Increase
Manifold Pressure By Forcing Air Into The Engine Induction System -
It's Like
FREE SUPERCHARGING! "

The cowl is built so that the round intake hole is right behind the
tab in the prop.

John Galban=====N4BQ (PA28-180)