Joe, I think it can be made to work with the extra drag you are installing, but there are a couple of issues with your plan.
#1), Your KR can land much slower than 70 mph. You should be able to touch down around 55 mph if you hit your approaches right. That's an approximate speed because it depends a lot on which wing you have, flaps, weight, etc. With flaps and RAF 48 Diehl wings, I stall at 52 mph. Your KR can be build to land slower than mine. #2) Hard braking at high speed isn't all that great on my KR. I know if I touch down a bit hot and want to brake hard, I'll get quite a bit of chatter from the glass gear flexing back. I simply can't brake hard until I get slowed down a bit. I've got good Cleveland brakes in excellent condition. It's the gear legs that flex a bit, but my gear legs are longer than others, so that "may" be the root of the high speed chatter. #3) Before I put flaps on my KR, I landed at a short runway where I had to drop over a tall tree at the end of the runway. I picked up too much speed dropping in over the tree, so forced the plane on the runway a bit fast and figured I'd brake hard to make the end of the runway. I came very close to sailing off the end of the runway. Even the good Cleveland disc brakes were fading pretty badly by the end of the runway. This experience convinced me to add flaps to my KR. You've already addressed this issue, but the point is that even the best 5:00x5 brakes will fade as they get hot. You may want to consider going to a larger 6:00x6 brake with low profile tires. Larry Flesner had his KR configured that way for a few years. #4) You don't say whether this is grass or really smooth, but braking action isn't very good on grass, and even less so with every little bump in the grass. The smaller the tires, the less traction you're going to have on the grass. Again, I think it can be done, but there are a few issues to be worked out and a lot of practice to get there. -Jeff Scott Los Alamos, NM > I feel that I should provide full disclosure in my response to your question. > I fly out of a 1200 foot grass strip. I have no problem taking off and > landing. I have not flown out of my airfield with my KR2 yet but I have put a > lot of thought into the situation and I believe that the KR2 can be safely > flown out of a 1200 foot strip.? > > Touchdown should be at about 70 mph. I plan to have some high quality > hydraulic disc brakes. Touch down at the edge of the field and begin braking. > I have a tail dragger so the fuselage will remain level until the speed is > low enough to drop the tail. A bellyboard or airbrakes could be helpful.? > > I am very interested in how things work for you. ?Please keep me informed. > ?I'm at least a few months out before I am ready for taxi testing.? > > Joe > Sent from my Verizon Wireless 4G LTE smartphone > > <div>-------- Original message --------</div><div>From: Pierre via KRnet > <krnet at list.krnet.org> </div><div>Date:02 > > > > I installed both flaps (20" X 12" inboard) as well as a belly board > (clearance 2" hanging 90 degrees down). The idea is to use flaps on approach > and use speed brake after touchdown. I will be testing on a 3,000 feet > strip, but my personal strip is only 1,200 feet, so want to see if I can > land within the 1,200 feet limit employing both systems in the sequence > described above. > > > > Has anyone tested the amount of speed loss per 10 degree implementation of > the belly board in straight and level flight? For example a 10 degree > deployment reduce speed by 10 knots at 1,700 rpm. Also any advise or > comments wellcome, both possitive and negative. > > > > The plane is now extremely close to finally testing and hopefully flightJ > > > > Take care! > > Pierre > > KR2S (98% compelted) > > Wittman Tailwind (80% completed) > > _______________________________________________ > 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 >
