Mailing List flyrotary@lancaironline.net Message #20177
From: Jim Sower <canarder@frontiernet.net>
Subject: Re: [FlyRotary] Re: Air Cleaners-Screens
Date: Tue, 12 Apr 2005 23:03:00 -0500
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
<...  I can only find out by putting the plane in a wind tunnel and releasing a swarm of bees ...>

Or talk to someone who ran the Air Venture race from NC to Dayton to OSH in '93.  Some of the plastic planes accumulated so many bugs in a swarm near Dayton that it affected the flying surfaces and a couple of guys had to land at > 100 kias because the wings wouldn't fly any slower. 
Like they were in ice ... Jim S.

Al Gietzen wrote:

 

One situation that I can think of, that is very likely to occur would be flying into a swarm of bugs. Even a coarse screen such as Al has installed could easily become clogged with dead bugs choking off all intake air and causing the engine to stop running.

 

Hard to imagine where I could run into such a density of bugs; however, if I have a theory that they would not get in the intake.  The scoop is located behind the maximum diameter of the fuselage.  The bugs (that didn’t get smashed) would be accelerated outward away from the fuselage as the plane passed by, and because of their greater momentum (than the air), would not come back toward the surface sufficiently to enter the scoop as the fuselage converges.

 

OK; at least that’s the theory.  I can only find out by putting the plane in a wind tunnel and releasing a swarm of bees J.

 

Oh; BTW Jerry, the air here in coastal CA where the prevailing breeze is off the ocean has very little dust.  And the Velocity will never (I hope) take off from a dirt strip.

 

Al

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