REFLECTOR: Alternate Air

[Terry Miles]

Andy,
Yep, and mine is much the same.  Spring closed, vacuum opened.  I looked,
sorry not pics.
Terry


-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of doug.holub at tx.rr.com
Sent: Friday, July 18, 2008 8:05 PM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: Alternate Air

I'm doing my alternate air this week, too. I've got a fiberglass elbow that
connects to the air intake. I'm cutting a square flap out of the bottom of
that, and then putting it back in with a springy hinge on one edge. (That
springy hinge will be one or two plies of bid.) When there is normal air
pressure at the intake, the flap will remain closed. If something clogs the
air filter, the resulting vaccuum will open the flap.

After I thought of doing it this way, I checked online to see if anyone else
had done it that way. I found a couple of production airplanes that had
"automatic alternate air" which were springy hinged flaps. One was the SR22,
I think. It also has a microswitch on the flap so that the pilot will know
when alternate air is being used.

Doug Holub
Waiting on the propeller. 68/78 two blade Prince P-tip. I ordered it in
January.

---- Andy Millin <amillin at sbcglobal.net> wrote: 
> For those running an intake filter.  I am looking for ideas on
implementing
> an alternate air source.  I would love to hear and see (if you have the
> picture).
> 
>  
> 
> Thanks,
> 
>  
> 
> Andy
> 
>  
> 
> =====================================
> 
>  
> 
> Andy Millin
> 
> amillin at sbcglobal.net
> 
>  
> 

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