John: I was not fully aware of all the details of the Cardinals elevator stall problem but just thought it might be a relevant place to look for clues.
My connection with the early Cardinal is that I had my one and only emergency landing in one of the anemic 150 HP models with the laminar flow wing in the So. California desert 1/2 way between Palm Springs and the Colorado River on Easter Sunday 1971. TTAF&E 1150 hrs wrist-pin boss on the left rear piston failed! Full power on final 1300 rpm to dragit in as slow as possible with the "Barn-Doors " full down could not read the panel for the vibration. All in all an experience I never wish to repeat.---- never wrinkled the aircraft and set it down in less than 600 ft. Don ------------------------------------------------------------------------ Martindale Family wrote: > Bill and Don > > I own a Cardinal and have test flown them. The underside of the elevator > used to stall at extreme back pressure resulting an uncontrolled pitch down > of the nose. This was cured using inverted slots as you say but the point I > am making is that it is a different issue to the stall of the main wing > where you want the nose to drop to recover. The Cardinal issue occured > during the flare when you want to keep the nose up and it wouldn't leading > to a porpoise. It was not an issue for the stall you are talking about....in > fact it helped!! Bill's problem sounds more like a CoG problem, ie., to far > back such that the elevator cannot lift the tail to decrease AoA on the main > plane....or perhaps the elevator travel is limited/incorrectly rigged. > > Regards John > > Martindale Family > 29 Jane Circuit > TOORMINA NSW 2452 > AUSTRALIA > > ph: 61 2 66584767 > email: johnja...@optusnet.com.au > web: http://www.members.optusnet.com.au/johnjanet/Martindale.htm > ----- Original Message ----- > From: "D F Lively" <riksh...@interl.net> > To: "KRnet" <kr...@mylist.net> > Sent: Thursday, March 30, 2006 1:53 PM > Subject: Re: KR> cg with Deihl wing skins > > > Bill: > > > > I can not address this with respect to KR aircraft but do have knowledge > > of an elevator stall problem in the early units of a certified craft that > > led to ADs. The early Cessna Cardinals(177s) with the Laminair flow wing > > had such a problem That crafy has a "Flying Tail" and is a high wing. > > Cessna cured that problem by adding LE slots to the elevator. I do not > > know whether it help or not but perhaps some examination of the elevator > > stall problem assciated with the Cardinal problem may serve as a basis for > > understandin of elevator stall problems cause and cure. Perhaps a direct > > inquiry of Deihl himself will shed some light. > > > > Just a suggestion as it sounds way to importent to let slide. > > > > Don > > ------------------------------------------------------------------------ > > > > countryhomeprint wrote: > > > >> Recently the first flight was made in 880AB. As with most any > >> experimental aircraft a few problems occur. Question? Is the cg range for > >> Dan Deihl wing skin wings the same as for the standard KR-2 wings? > >> N880AB's cg falls within the limits for the standard KR-2, however my KR > >> feels tail heavy. I am unable to establish a true stall due to the > >> uncontrolled pitching up of the wings prior to stall. It feels as if the > >> horizontal stab and elevator are stalling prior to the wings. This > >> happened during the first stall approach and a stall approach will not > >> happen again until the problem is solved. Has anyone experienced this? > >> Anyone have a thought as to WHY. This could be a dangerous situation. > >> > >> 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 > > _______________________________________ > 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
