While I must agree with your comments, Ferg, there is a way to use the NACA
inlet to do the job, thanks to our old friend Bernoulli. See
http://hyperphysics.phy-astr.gsu.edu/hbase/fluids/aspir.html for a brief
description of an aspirator, a device for generating low pressure by using
higher pressure flow. Many of us are probably familiar (from chem lab) with
the scheme shown in the hyperlink where water is used to generate air flow
into the tee, but the same principle works with compressed air in the
straight leg of the tee to create a vacuum in the side arm of the tee.
Clever guy, Bernoulli.
Best regards,
Rob Housman
Europa XS Tri-Gear A070
Airframe complete
Irvine, CA
-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com]On Behalf Of Fergus Kyle
Subject: Re: NACA vent placement (was RE: Europa-List: Gel Coat)
----- Original Message -----
From: "qcbccgalley" <cgalley@qcbc.org>
Subject: Re: NACA vent placement (was RE: Europa-List: Gel Coat)
| NACA vents are INlets not outlet vents. They don't work as outlets.
Right. I've noted several mentions of using the vent for evacuating the
cabin air. The NACA inlet was chosen to operate the engine inlets for the
F93 version of the Sabre. It is designed to induce intake from high speed
flow without incurring great drag. . It will do nothing for cabin outlets or
any other reverse flow. Might as well cut a hole.
Ferg
A064
|