[ARC5] copies

[Geoff]

Those exhaust stacks provided rapid scavenging of the exhaust gases similar 
to the short headers on dragsters. Im not sure when special tuning of the 
lengths to provide the best hp increase came along but I believe it was in 
the 50's.

Now its all up to the computer.


----- Original Message ----- 
From: "Kenneth G. Gordon" <kgordon2006 at frontier.com>
To: "Alan Morriss" <mohawk at clara.co.uk>
Cc: <Arc5 at mailman.qth.net>
Sent: Friday, August 17, 2012 3:17 PM
Subject: Re: [ARC5] copies


> On 17 Aug 2012 at 19:52, Alan Morriss wrote:
>
>> Incidentally , everyone I know who heard zeros says the same
>> thing about the engine note. i would imagine it was due to the design
>> of the exhaust system .alan G4GEN
>
> The Zero had very short exhaust stacks surrounding the cowl. They were
> designed specifically to provide some "thrust".
>
> Later in WWII, some Allied radial-engined planes were also designed the
> same way.
>
> This is what gives the Zero its distinctive sound.
>
> BTW, there is a youtube video of one of the very few restored Zeros which
> still has an original Sakae engine. The videos shows the engine being
> started, run up, and the plane taxiing and flying. It does most definitely 
> have
> a very distinctive sound.
>
> On a slightly different note, the P-51's cooling system was also designed 
> to
> provide some positive thrust. This compensated for the air-drag loss 
> caused
> by the radiator system of almost all other water-cooled aircraft of the 
> time
> which didn't have such compensation. The P-51's cooling system design and
> implementation resulted in essentially zero effect on airspeed, rather 
> than a
> loss. At some power-settings, it actually reduced fuel-usage and increased
> engine efficiency.
>
> Ken W7EKB
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