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
