somehow this message tripled. sorry... From: chrisprata at live.com To: krnet at list.krnet.org Subject: RE: KR> Flaps versus belly board versus spoilers List-Post: krnet@list.krnet.org Date: Wed, 14 Jan 2015 16:24:20 -0500
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 > > > _______________________________________________ > Search the KRnet Archives at > http://tugantek.com/archmailv2-kr/search. > To UNsubscribe from KRnet, send a message to KRnet-leave at list.krnet.org > please see other KRnet info at http://www.krnet.org/info.html > see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org > to change options > > > _______________________________________________ > Search the KRnet Archives at http://tugantek.com/archmailv2-kr/search. > To UNsubscribe from KRnet, send a message to KRnet-leave at list.krnet.org > please see other KRnet info at http://www.krnet.org/info.html > see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change > options
