From: krnet-bounces@mylist.net
To: John Bouyea <krnet@mylist.net>
Subject: KRnet Digest, Vol 346, Issue 75
Date: 5/17/2004 9:00:27 PM

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Today's Topics:

   1. Re:  Air brake holes/ C.G. (Ray Fuenzalida)


----------------------------------------------------------------------

Message: 1
Date: Mon, 17 May 2004 20:10:13 -0700 (PDT)
From: Ray Fuenzalida <ray_pilot@yahoo.com>
Subject: Re: KR> Air brake holes/ C.G.
To: KRnet <krnet@mylist.net>
Message-ID: <20040518031013.48279.qmail@web42002.mail.yahoo.com>
Content-Type: text/plain; charset=us-ascii

Is there any kind of guidance on these holes in the
speed brake?  I have a belly board (speed brake) and
it is solid.  I can easily put holes in it.  What is
the optimum size hole and number?  Does layout matter?
Ray
--- larry flesner <flesner@midwest.net> wrote:
> >In yours experience how many holes I can make in my
> belly air brake and
> which diameter.
> 
> >I've tested my KR2 with a passenger on board at
> take off weight of 483 kgs
> ( about 1063 lbs.) and C.G. at 26,9 % wing chord.
> >Ewerythig OK but now the pitch is VERY sensitive.
> >I've landed with some difficulties with 15 kts of
> wind not exactly in axis
> ( cross??) but i can use again my plane :-))
> >Ciao
> >Franco Negri
>
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> 
> I've never read anything scientific about holes in
> airbrakes so all I
> have is my experience.  You can see my speed brake
> at:
> 
> http://home.hiwaay.net/~langford/flesner/19.jpg
> (speed brake)
> 
> The holes are 3/4" as that is one of the hole cutter
> saws I had.
> I seem to recall the holes are to help create extra
> drag.  One of
> the U.S. Navy WWII torpedo planes had a speed brake
> with
> lots of large holes.
> 
> Your C.G. location is approx where mine is with just
> me (200 lbs)
> and full fuel (25 gal).  My KR is standard but has a
> 24" stretch
> on the fuselage.  At that C.G. my KR still handles
> well.  Even
> with an additional 150 lbs in the passenger seat it
> does not
> seem to be overly sensitive.  The controls are light
> at all C.G.
> locations for me but it has yet to feel over
> sensitive.
> 
> Larry Flesner
> 
> 
> 
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End of KRnet Digest, Vol 346, Issue 75
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