I am really happy learning all I can about these little airplanes I just went and picked mine up this weekend it also has the belly board with holes in it and I was reading to your email towards the end you said that it would be handy to have them tied in with the regular flaps and it’s funny that you said that because that is exactly how mine work anytime you put down the flaps it automatically pulls the board down with it I am really looking forward to getting the airplane put back together and flying the tail number is 6GM if anyone has any history or knowledge about it
Sent from my iPhone > On Dec 13, 2020, at 7:44 PM, Mike Stirewalt via KRnet <krnet@list.krnet.org> > wrote: > > >> "For anyone using a belly board on their KR's . . ." > > Joe, when I first got my plane from Steve I looked into the "holes vs > solid" question and learned that the dive bombers such as the Douglas SBD > used holes in the flaps to reduce weight and, more importantly, to reduce > aerodynamic stress related to turbulance in the dive. Seems like having > holes would create _more_ turbulance, but my memory (such as it is) tells > me the holes were used primarily to reduce turbulence in the dive. > Controllability issue as I recall. > > Mine (Ken Cottle's) came with holes. After concluding from what I'd read > and heard that a solid flap would be more effective, I taped over my > holes with some heavy duty tape to see if I could tell a difference. It > seemed to be more effective with the holes covered. The tape didn't last > long and I planned to cut some plugs to match the circles and thus > restore the flap to a solid plane, but the improvement was so small I > never got around to it. My fuselage is only 24" wide and my flap only > extends to 30 degrees so using belly board or not using it doesn't make > much difference, although I always do use it. > > Flying Jim Morehead's full-width KR-2 with a belly board (no holes) was > not only wider than mine but in addition, extended to 45 degrees (or > perhaps a bit steeper - can't remember) and was extremely effective. > Landing his tri-gear KR with belly board fully extended was an exquisite > pleasure, allowing a very steep and slow approach.. His extension > mechanism was much more rugged than mine. On 3345KC Ken had used a > fairly flimsy extension mechanism that someone, perhaps Rand, had > designed. I've seen the same design on other KR's. It works, but Jim's > design was far better. > > BTW, these belly boards also lower stalling speed by a little, adding > lift as well as drag, so are really nice to have. I assume you've got > conventional flaps on your already-built aircraft. > > ******************* > > A truly ideal design would be split flaps, or even normal hingeflaps, but > linked to a belly board. The design seen on the Mustang II or DC-3 or > Cessna 310 is what I'm referring to, although the term belly board > doesn't exactly apply with those planes.. > > From what Sparky has mentioned regarding the effectiveness of his stub > wing hinged flaps, he says they hardly make any difference. A large, > steeply angled belly board such as Jim Morehead had works extremely well > though. I'd forego the holes. > > Mike > KSEE > > > > ____________________________________________________________ > Sponsored by > https://www.newser.com/?utm_source=part&utm_medium=uol&utm_campaign=rss_taglines_more > > 'We Will Not See His Like Again' > http://thirdpartyoffers.juno.com/TGL3141/5fd6c32387ea643231797st01vuc1 > Wisconsin Justice Takes Trump Lawyer to Task > http://thirdpartyoffers.juno.com/TGL3141/5fd6c323ab61143231797st01vuc2 > US Treasury Gets Hacked, Sources Say > http://thirdpartyoffers.juno.com/TGL3141/5fd6c323cf7e943231797st01vuc3 > _______________________________________________ > Search the KRnet Archives at > https://www.mail-archive.com/krnet@list.krnet.org/. > Please see LIST RULES and KRnet info at http://www.krnet.org/info.html. > see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change > options. > To UNsubscribe from KRnet, send a message to krnet-le...@list.krnet.org _______________________________________________ Search the KRnet Archives at https://www.mail-archive.com/krnet@list.krnet.org/. Please see LIST RULES and KRnet info at http://www.krnet.org/info.html. see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change options. To UNsubscribe from KRnet, send a message to krnet-le...@list.krnet.org
