Because I'm barely smart enough to occasionally realize at least som of what I don't know, I'll not comment personally on this thread, but it's a subject I have found interesting for many years...stability and control. Let me simply quote a Mr. Don Stackhouse, who I believe once was a propeller engineer,
"...dynamic stability is linearly proportional to tail surface area, but proportional to the SQUARE of the tail moment arm, so extremely short tails tend to have poor dynamic stability.". Don knows airplanes. The comments he posts regularly to the electric flight RC bulletin board I monitor, are most informative. I've yet to see anyone successfully challenge him on any subject aerodynamic...not just propellers. Don manufactures airplane kits and has a web site with many Q/A posts I believe the KR group would appreciate reading. I'll lookup the URL and post it. -Lloyd Schultz Ron Freiberger wrote: > Most of that crap is smoke and mirrors. Anyone who thinks lengthening the > tail 14 inches will fix it probably also believes in Leprechauns. I don't > tell my leprechaun story lightly. > > Ron Freiberger > mailto: rfreiber...@swfla.rr.com > > -----Original Message----- > From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net]On Behalf Of > Oscar Zuniga > Sent: Tuesday, June 03, 2003 12:30 PM > To: kr...@mylist.net > Subject: KR>it's something to do with the elevators > > Ameet writes- > > >When the distance between the HS and the wing is small (short couple) like > >in the KR > >the NP is close to the surface with the higher lift (the wing) which leaves > >less > >static margin for the CG and hence the inherent pitch sensitivity. > > If any airplane should be short-coupled and pitch sensitive (just by > observation), it would be the Questair Venture. But it isn't (read the > flight test info at http://www.airbum.com/pireps/PirepQuestairVenture.html ) > so it must be "something to do with the elevators" ;o) Far better minds > than mine have tackled this issue and have come up with redesigned tails, > aerodynamic counterbalances, different linkage ratios, biasing springs, and > other things to change the pitch feel of the KR, and the jury is still out > on many of these things because they haven't flown yet. But I'll bet that > by this time next year there will be some actual data posted here, so stay > tuned. > > Oscar Zuniga > San Antonio, TX > mailto: taildr...@hotmail.com > website at http://www.flysquirrel.net > > _________________________________________________________________ > STOP MORE SPAM with the new MSN 8 and get 2 months FREE* > http://join.msn.com/?page=features/junkmail > > _______________________________________________ > see KRnet list details at http://www.krnet.org/instructions.html > > _______________________________________________ > see KRnet list details at http://www.krnet.org/instructions.html
