If the spring pressure on the flap is adequate. Rememeber that you might have some negative pressure in there on transients and the flap will always be operating, so make sure it is stout. Some have a built in latch that you can open on command. BTW, I ran into low intake pressure that was due to blocked filter that caused the alt air door to open all the time. Having the thing moving a lot will cause a broken intake air flapper-and possible parts ingestion.
Marc W.
> From: "John Slade" <sladerj@bellsouth.net>
> Date: 2005/06/17 Fri PM 10:59:50 EDT
> To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
> Subject: [FlyRotary] Installing an air filter
>
> OK, its time for some peer review.....
>
> Who was it that asked for pictures of my air filter installation?
> The description is at http://www.canardaviation.com/cozy/chap29f.htm#rumble
>
> The alternate air source is a simple hinged flap which opens inward and has
> a lip to seal it and stop it opening outward. The theory is that the flap
> will close when the plenum is pressurized. If the air filter gets blocked,
> then the pressure change will open the flap and the turbo will draw air from
> inside the cowl.
>
> Think it'll work?
> John (Rusty - just look at the pictures)
>
>