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 <fles...@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 > > > > _______________________________________ > to UNsubscribe from KRnet, send a message to > krnet-le...@mylist.net > please see other KRnet info at http://www.krnet.org/info.html
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