That's the way I heard it too.
Jack
----- Original Message -----
From: <lm4@juno.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Wednesday, June 30, 2004 7:57 AM
Subject: [FlyRotary] Re: Temps finally down


> Guy's,
> I don't know a lot about this but I'll dare to comment anyway.
> Many planes were built with a scoop way back on the fuse.
> The German military thought the little scoop back on the fuse was
> too risky so they had it moved to the front.  This caused the prop to
> approach the inlet, pushing air into the rad, and as it passed by it
> would pull the air back out again causing overheating problems.
> North American solved this by moving the scoop back to where
> it is now. The little scoops back on the fuse were still having
> problems and someone came up with the notion that the boundry
> layer was deflecting off the fuse and into the scoop, causing
> an air dam. N.A.s answer to this was to pull the rad inlet away
> from the fuse and the boundry layer. It seems to have worked.
> Hope I'm not too far off here.
> Larry Mac Donald
> Rochester N.Y.
> do not archive
>
>
> On Wed, 30 Jun 2004 07:52:21 -0400 "Steve Brooks" <steve@tsisp.com>
> writes:
> > Ed,
> > I would like to have more information on the reason for keeping the
> > boundary layer air out.  My current scoop is open, and lets in both.
> If the
> > boundary layer air needs to be excluded, then my next scoop will have
> to be
> > like the P51 scoop which does exclude it.  I never really understood
> why.
> >  Looks like I may have to have another look at Bulents' scoop.  His
> > is made like the P51.
> >
> > Steve
>
>
> >>  Homepage:  http://www.flyrotary.com/
> >>  Archive:   http://lancaironline.net/lists/flyrotary/List.html
>