KR Heads, Regarding the "postage stamp" size flaps on the KR2S, I built them in and I would disagree. They are useful in lowering the stall speed by maybe 5 mph in stall tests I have done at altitude. Glad I made the effort to build them.
They also are a big help to forward visibility when landing ( nose down view). I wish I had also installed the belly board to reduce the floating down the runway syndrome in ground effect. Cheers Chris G KR2S 250 hours -----Original Message----- From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net] On Behalf Of Peter Diffey Sent: Wednesday, August 03, 2011 5:17 PM To: KRnet Subject: Re: KR> Flap and belly board combination. Hi, I am no expert, but as far as I can figure, a belly board will increase drag but will not increase lift, so will not allow a lower landing speed. The belly board drag will allow a steaper approach, it will also help you bleed off speed during the roll out. Whether the kr2 flaps have any significant effect on stall speed is a moot point, I doubt if anybody has done any design analysis. Looking at the flaps on my std kr2 I doubt if they do much to stall speed. The easiest way to keep down the safe landing speed is to build light - I thought hemlock was a sort of poison :) Pete -- Sent from my Android phone with K-9 Mail. Please excuse my brevity. Rodger Nicolls <bandenok...@gmail.com> wrote: Phil and Larry, Thank you for the replies. I am looking at dropping the stall/landing speed, increasing the visibility, and contending with a heavier empty weight (using hemlock, 10% heavier than spruce, with extended fuselage). I have moved the controls in front of the rear spar and plan to use the entire area behind the spar for the flaps. On anther note: I completed building my gear legs: 50 layers S-glass-BID and 38 layers S-glass-UNI, with a total compressed/cured thickness of .80". Now I just need to get the mount welded. If anyone is interested in the story (with pictures) of an experimental Cub being destroyed by a calving glacier, let me know and I'll forward those to you. It's a shame that after spending all that time on a lovely project to see it lost in a matter of seconds. I will continue to build. Thanks, Rodger _____________________________________________ 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 _______________________________________ 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
