At 10:47 AM 8/18/2006, you wrote: >I am considering adding flaps to my KR2 at a later stage, and the time is >right to make provisions for them. > I wonder which design would be more >efficient, aerodynamically speaking? What the standard KR needs for a more comfortable landing approach is DRAG and the speed brake is the simplest way to achieve that.
I agree with Larry with only one change in description of use in flight. On my standard plans built KR2 with Dan Diehl wings and all else standard dimensions, when I deploy my speed brake to 25 degrees, I usually do on base leg, so I have gone from 110 mph on downwind to 100 on base, and then the brake which noticably causes a down pitching moment increasing my visibility, while slowing the plane to 90 to 95 mph. Turning final I rollout and then apply brake to 50 degrees, and the effect is the same as 40 degrees of flaps on the older November model C 172's, my KR makes a constant descent as if on a slide, with no buffet or shudder, and slowing to 80 mph. I round out approximately 200 feet from the runway end, over the extended threshold (It is an Air Carrier airport, so has commercial style runways) I round out into ground effect, approximately 10 to 20 feet AGL. This slows me to 75 mph immediately, and that is quickly followed by the dramatic slowing caused by the brake. Some where between 60 and 70 (I am looking outside completely, so not sure on speed) I allow it to sink to what "feels" like just before touching and the raise the nose slightly to hold her off. When the sink returns I "roll" the mains onto the runway the same way one might smooth icing onto a cake, slow and steady. Normally I get just a slight chirp, and bump, and I follow that with continued forward pressure to hold the tail up until it begins to fall on its own. At full nose down stick on rollout with the tail up, I can gently begin applying the brakes to shorten my rollout, and once the tail is down, full aft stick holds it down during taxi. Hope this helps your decision... Colin Rainey brokerpi...@bellsouth.net <mailto:brokerpi...@bellsouth.net> _______________________________________ Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net please see other KRnet info at http://www.krnet.org/info.html
