Hmmmm, is there room betyween the prop disc, and the ailerons, on a KR1? I also
wonder what a split condition would do, could the ailerons overcome that?
As to the jets using them after touchdown, apparently they also use them in
flight. I found a youtube video of that, passenger was filing the wing, and the
spoilers came up at the back of the wing. The plane was rumbling a bit. Must
have been to slow down?
Also, the B52 Bomber "America's diplomat in the skies" uses spoilers instead of
ailerons, IIRC.
> Date: Wed, 14 Jan 2015 12:43:50 -0800
> To: flesner at frontier.com; krnet at list.krnet.org
> Subject: Re: KR> Flaps versus belly board versus spoilers
> From: krnet at list.krnet.org
>
> HI Larry,
>
> Not sure what you mean by "the KR is not a design that call for spoilers"?
> They definitely kill LIFT which takes care of the "floating problem" of the
> KR.. They would work on any airplane when placed in the proper location.
>
> I've got several Moni motorgliders which utilize them and they will float
> like a KR if you don't use them. Originally a set of doors were installed on
> both sides of the main wheel pant, but the most it did was cause a nose down
> pitch attitude. Spoilers were the solution.
>
> If you're using spoilers, you don't have to "point the nose down to dirty up
> the air flow".. They will stop the wing from "flying" very effectively. In
> a lot of cases you actually have to keep power in to cut down on the descent
> rate to keep the plane flying.
>
> I know there are other homebuilt designs using spoilers. One type raises up
> out of the wing like a pair of scissors. The ones on my airplanes deploy
> like a belly board except they are on top of the wing. You don't need very
> big ones to kill the lift. Normally installed outside the prop diameter in
> the root portion of the wing for best lift killing..
>
> All these designs work well. You just need to figure out which one you want
> to use, how easy they are to build/install and enjoy!
>
> Just my .02.
>
> Ron
>
> --------------------------------------------
> On Tue, 1/13/15, Flesner via KRnet <krnet at list.krnet.org> wrote:
>
> Subject: Re: KR> Flaps versus belly board versus spoilers
> To: "KRnet" <krnet at list.krnet.org>
> Date: Tuesday, January 13, 2015, 6:11 PM
>
> +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>
> Spoilers are used primarily on gliders to kill excess lift
> in order
> to steepen the approach to landing and also on large
> commercial
> aircraft to kill lift after touchdown to transfer the weight
> to the
> landing gear. The KR is not a design that call for
> spoilers. The
> only shortfall, if you can consider it a shortfall, is the
> need for
> deployable drag in the landing approach. It is a very
> slick design
> that makes speed control in landing a bit
> tricky. It will also
> float after the flare if too much speed is carried on the
> approach.
>
> Effective flaps or a speed brake are both proven solutions
> to speed
> control on landings. The speed brake is probably the
> simplest to
> build but effective flaps may offer other benefits beyond
> simply
> adding drag. If you're building to fly, go with what's
> proven. If
> you want to experiment and try new things, go for
> it.............
>
> Larry Flesner
>
>
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