Special prop to increase manifold pressure

[Fly]

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

[Ben Jackson]

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/

[Scott Skylane]

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

[[email protected]]

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 *
************************************************** ***********************

[John Galban]

"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)

[Fly]

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)

[BTIZ]

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
>
>

[John Galban]

"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)