[DeTomaso] NPC - Mid Engine airplanes - Hooks Man redux

[John Bentley (jab)]

Mike, can you fit one of these turbo-superchargers to my Pantera? :)

JB

 

-----Original Message-----
From: detomaso-bounces at realbig.com [mailto:detomaso-bounces at realbig.com]
On Behalf Of Mike Trusty
Sent: Thursday, March 30, 2006 2:58 PM
To: 'Daniel C Jones'; detomaso at realbig.com
Subject: RE: [DeTomaso] NPC - Mid Engine airplanes - Hooks Man redux

I think you will find that all Allison V12 right from the beginning were
supercharged.  The supercharger was simple centrifugal charger mounted
in
the accessory housing and run off of the flexible vibration damper.
Later
versions had a two stage supercharger.  What made the engine work in the
P-38 and others was that they were turbo-supercharged.  It had both an
internal supercharger and an external supercharger.


Mike Trusty Engineering
15119 Gorgeous View Trail
Little Rock, AR  72210
Ph:  501-224-9013
Fax: 501-421-0151

> -----Original Message-----
> From: detomaso-bounces at realbig.com
[mailto:detomaso-bounces at realbig.com]
> On Behalf Of Daniel C Jones
> Sent: Thursday, March 30, 2006 4:41 PM
> To: detomaso at realbig.com
> Subject: Re: [DeTomaso] NPC - Mid Engine airplanes - Hooks Man redux
> 
> > The P-39 never had the performance of a P-51.
> 
> Agreed but that was primarily due to the lack of development the
aircraft
> received.  In aircraft design, development counts for a lot.  The
early
> models of an aircraft are generally much less capable than later
models.
> While the P-39 did evolve over its lifetime it didn't receive the sort
of
> development the P-51 did.  The P-39 was an earlier design originated
when
> Army Air Corp doctrine didn't foresee the need for high altitude
escort
> and most were sent to the Eastern front so the aircraft didn't warrant
the
> sorts of changes that transformed the P-51A into a P-51D.  The Allies
> didn't care for them but the Soviets did.
> 
> > It also had bad snap spin characteristics.
> 
> Another one of those things that could have been dealt with like the
P-
> 38's
> tuck-under problem.
> 
> > The P-39 never got Superchargers. They were intended to get them
from
> > the begining but never did. They had some cooling issues with the
engine
> > burried in the fuselage.
> 
> I'm pretty sure the P-39's did get a single speed supercharged version
> of the Allison but they didn't get the turbo-supercharged version,
except
> for test models.  I believe the Wright Field engineers relocated and
> reduced the inlet for less drag.  The resultant inlet wasn't capable
of
> feeding
> the greater demands of a turbo-supercharger.
> 
> > What was the deal with the Allison that made it a dog?  With turbos,
> > didn't it work out okay in the P-38's ?
> 
> Yes it did.  In a P-38L, it's max power at sea level was 1475 HP but
it
> was also turbocharged and could retain it's power at higher altitude.
> In the P-51A and P-39's, it was installed without turbocharging so the
> power was only 1100 HP and that dropped with altitude (above 11K ft).
> The P-51 was built to a British contract.  After evaluating the
non-turbo
> Allison models, the RAF found them lacking and fitted the more
powerful
> Rolls-Royce Merlin.
> 
> Dan Jones
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