REFLECTOR: Duct ventillation

[Laurence Coen]

A leaky exhaust might not smell but I wouldn't want that creeping up front. 
Be careful of what you wish for.

Larry Coen
N136LC

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From: <scott at tnstaafl.net>
Sent: Thursday, October 22, 2009 12:34 PM
To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
Subject: Re: REFLECTOR: Duct ventillation

>> At, say, an airspeed of 150 kts the dynamic pressure available is about
>> 14"
>> H2O.
>
> If you mean the differential pressure between entry and exit, that's
> excellent!  Most of the cooling experts say that no matter everything else
> if the differential pressure isn't high enough you won't cool the engine.
>
>> Block the wiring ducts at the firewall to prevent the flow of air 
>> forward.
>> This is a good idea anyway, because if ever there is an event of fire in
>> the
>> cowl, you don't want it going up the ducts.
>
> I've always thought that too but, somebody on the list did mention some
> incident where he smelled something and put down to investigate. It would
> have been a serious problem but the slight airflow carrying the smell
> through the duct alerted him to it in time.
>
> Scott
>
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