REFLECTOR: Duct ventillation

[scott at tnstaafl.net]

> 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