John: It seems to me there was an issue called the "Secondary Stall" that my instructor said was potentially very dangerous but that was 43 years ago and beyond a vague recollection I recall little of the issue. My training was in Cessna 150s.
Don ------------------------------------------------------------------------ Martindale Family wrote: > Hi Bill, > > Please elaborate on the Aerospace Department's conclusions. > > Seems to me a pitch up would occur in these circumstances only if the > aircraft had its weight behind the CoG and that component is in excess of > the lift available from the tailplane under forward stick. Obviously I'm > missing something here and why isn't it reported from other Diehl wings > currently flying. I agree, whatever it is it is potentially dangerous. > Critically, does the nose actually drop at the stall itself after the pitch > up immediately prior it? > > Cheers John > > John Martindale > 29 Jane Circuit > TOORMINA NSW 2452 > AUSTRALIA > > ph: 61 2 66584767 > email: johnja...@optusnet.com.au > website: www.members.optusnet.com.au/johnjanet/Martindale.htm > ----- Original Message ----- > From: "countryhomeprint" <countryhomepr...@bellsouth.net> > To: "KRnet" <kr...@mylist.net> > Sent: Friday, April 14, 2006 6:47 AM > Subject: KR> Horizontal stab stall > > > KR-netters > > > > After consulting with the Aerospace Department at Mississippi State > > University concerning the pitching up of my KR-2 upon stall approach, a > > probable cause has been reached. The Horizontal Stabilizer is stalling > > prior to the wing stall. This may be caused by the longer wing by Dan > > Deihl. This creates a very dangerous condition. There are three ways to > > prevent this condition. (1) Increase the stabilizer area by increasing by > > several inches the length of the stab. The standard flat stabilizer is > > only about 50% as efficient as a stabilizer with a true airfoil which > > leads to the 2nd method of prevention. (2) Change the stab airfoil to a > > true airfoil which will increase the efficiency of the stab. And (3), > > Don't stall the aircraft, keep the airspeed well above stall. > > It has been noticed that some KR-2 builders constructed a true airfoil > > rather than the flat stab shown in the plans. Maybe it should be noted to > > other KR builders to do the same. > > You guys who have true airfoil stabs, where did you get your plans, > > technical info., etc. I would like to change my stab to a true airfoil. > > > > Maybe if I put Armorall on my horizontal stabilizer my problem will be > > solved. > > > > I'm still finding dingle berrys after that close call. > > > > Bill Page > > boliverp...@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 > > _______________________________________ > 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
