Weight and Balance was calculated using the standard method. It was calculated 2 times by two different A & P's using aircraft electronic scales at the Raspet Flight Research Lab at Mississippi State University. Both calculations using 2 different datum points gave results within 1/4 inch of each other. I was sitting in the plane when the pilot calculation was made. Bill boliverp...@bellsouth.net
----- Original Message ----- From: "Jim Faughn" <jfau...@socket.net> To: "'KRnet'" <kr...@mylist.net> Sent: Thursday, March 30, 2006 9:24 PM Subject: RE: KR> cg with Deihl wing skins > Did you actually measure the CG when you were sitting in the plane or is > this a theoretical calculation? > > Jim Faughn > 891JF > > -----Original Message----- > From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net] On Behalf > Of countryhomeprint > Sent: Thursday, March 30, 2006 11:21 AM > To: KRnet > Subject: Re: KR> cg with Deihl wing skins > > Larry, my cg falls about an inch from the front limit empty. With full gas > it falls about 3/4 inch from front limit. This was determined with two > calculations with two different datum points. Each fell at approximately > the > > same distance from the front limit. With a 180 # pilot, the cg falls > approximately 1 1/2 inches from the front limit. With the cg this far > farward it could create a tail heavy situation. > However, as the craft slows, the back stick forces become less. The > incidence is exactly as the plans call for. I used an electronic level to > determine this. The dihedral is exactly as the plans call for, again > determined by electronic level. Also the twist at tip is right on. Ball > was > centered. Reaction was such that there was instant stick forward and it > recovered. Stall was never reached, however, the airspeed was reading > between 48 and 50 mph. > After Sun n Fun I am going to place 10 pounds forward and re-calculate the > cg. Then 15 lbs., 20# --- until I reach the center of the cg range. Then a > careful flight will be made. Verified level flight at 2500 feet at 2800 > rpm > is 135 mph. > > Bill Page > boliverp...@bellsouth.net > > ----- Original Message ----- > From: "Larry&Sallie Flesner" <fles...@verizon.net> > To: "KRnet" <kr...@mylist.net> > Sent: Thursday, March 30, 2006 8:25 AM > Subject: KR> cg with Deihl wing skins > > >> >> >>> 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. >>>Bill Page >> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ >> >> As others have mentioned, the Diehl skins should have no effect on the >> C.G. >> range of your KR. Their only difference,over the plans built wing, is a >> bit of >> additional length. Can you give us more info on the stall / pitch-up? >> Where >> EXACTLY does the C.G. of your KR fall in relation to the plans? What did >> you do to recover or did the KR recover on it's own by dropping the nose? >> Do you know the angle of incidence your wing is set at? Did it require a >> lot >> of back stick to hold the nose up to approach the stall? Was the ball >> centered >> at the time of "pitch-up"? Consider the following. If it's a CG problem >> and >> your KR is tail heavy, the recovery would seem difficult or >> impossible. If it's >> nose heavy, and you stalled the HS / elevator, it seems the nose should >> have >> pitched down. There are too many variables between KR's to GUESS what >> your problem might be without additional info. >> >> While my KR is stretched 24 inches, the wing and tail are plans built and >> set to "plans" angles. My KR has a VERY GENTLE stall with complete >> aileron and elevator control up to and through the stall. I get no wing >> break off or other unexpected reactions. This seems to be the "normal" >> stall characteristics for most KR's and how your KR ought to perform. >> I can understand your wanting to determine the cause before additional >> testing. When unexpected things happen in a new airplane it can scare >> the hell out of you. >> >> Larry Flesner >> >> >> _______________________________________ >> 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
