My KR2 is a first generation model having been started in 1977.It started out as a no electric retract at 550lbs.Through the years and mods,it is now an electic start fixed gear taildragger and the fuel is still in the header at 650lbs.The engine,a VW moved forward about 2 inches and the battery 12lbs. is mounted behind the aft spar just behind the passenger seat.To date the largest passenger has been 230lbs..Pilot is 180lbs.and fuel capacity 24 gallons in the header.Only in the case of long xcountry flights would I ever put more than 15 gallons in.I have only experienced aft cg issues with a passenger but even then were manageable not recommended.The aircraft flies best in the middle not forward or aft.Tommy W.
On Tue, May 12, 2015 at 8:24 AM, Ken via KRnet <krnet at list.krnet.org> wrote: > Hi Jeff > > That is exactly the point I was aiming to yesterday. The addition of a > single pound in the tail would require perhaps five times more in the nose > due to the differences in distance from the CG to the tail than the the > distance from CG to the nose. It is quite likely the balance weight on the > elevator is good to have but unnecessary for the KR-2 since much of it's > top speeds have shown that most of the KR-2 have exhibited little or no > concern. > > Adrian Carter and I were both building our own KR-2 at the same time in > Calgary and we were always concerned with how to keep our projects light. > That needs to remain the principle target with the KR-2. I am getting > close to finishing my plane many years after Adrian's. I haven't commented > on anything over the years but perhaps I should rather than just reading. > > Thank you > Ken R Nathan KR-2 C-FKRN > > > On 5/11/2015 11:34 PM, Jeff Scott via KRnet wrote: > >> Hi John, >> >> You are correct in that the fuselage was extended to address elevator >> sensitivity and the firewall moved forward to move the engine forward to >> make the plane easier to balance. Sid just stated it a different way by >> saying the wing was moved back by 2". Either statement is correct. I >> don't think the CG envelope changed at all between the 2 and 2S as far as >> CG range relative to the wing cord. >> >> I don't know why Sid's plane is so terribly tail heavy, but adding a ton >> of weight to it isn't the way I would go about fixing it. As someone >> pointed out, he has balance weights on the elevator. Those are really >> unnecessary on the KRs. I'd lose those in a heartbeat. When I rebuilt the >> tail on mine to a much larger elevator and stab, I designed it to >> accommodate a set of balance weights, but when it came down to it, I >> couldn't convince myself to add 4# of lead to the tail. >> >> Sid seems determined to fly his plane as equipped. That seems fool hardy >> to me and others have implied the same on the net. Hopefully he won't hurt >> himself in it. >> >> Best regards, >> >> -Jeff >> >> >> >> Hi Jeff >>> >>> I thought the -2S had the rear fuselage extended to reduce elevator >>> sensitivity and had the firewall moved forward to compensate by altering >>> the >>> engine mount position. I can well understand then why you correctly >>> needed >>> to add weight up front in various ways without building the firewall >>> extension. I wasn't aware that RR changed the CoG envelopes as well to >>> reflect any changes to wing position. >>> >>> I sincerely hope Sid has a successful flight but I don't understand his >>> reluctance to get his conclusions verified by a professional given the >>> stakes. To me it's a no brainer given the magnitude of the weights >>> apparently needed. >>> >>> Regards John >>> >>> >>> John Martindale >>> 29 Jane Circuit >>> Toormina NSW 2452 >>> Australia >>> ph:61 2 6658 4767 >>> m:0403 432179 >>> email:john_martindale at bigpond.com >>> web site: >>> >>> -----Original Message----- >>> From: KRnet [mailto:krnet-bounces at list.krnet.org] On Behalf Of Jeff >>> Scott >>> via KRnet >>> Sent: Tuesday, 12 May 2015 4:03 AM >>> To: krnet at list.krnet.org >>> Cc: Jeff Scott >>> Subject: Re: KR> Ballast weight installation >>> >>> Sid brings up a good point here, especially for builders that are early >>> on >>> in their projects......snip >>> >>> >>> >>> ----- >>> No virus found in this message. >>> Checked by AVG - www.avg.com >>> Version: 2015.0.5863 / Virus Database: 4342/9752 - Release Date: 05/11/15 >>> >>> >>> _______________________________________________ >>> Search the KRnet Archives at http://tugantek.com/archmailv2-kr/search. >>> To UNsubscribe from KRnet, send a message to KRnet-leave at list.krnet.org >>> please see other KRnet info at http://www.krnet.org/info.html >>> see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to >>> change options >>> >>> _______________________________________________ >> Search the KRnet Archives at http://tugantek.com/archmailv2-kr/search. >> To UNsubscribe from KRnet, send a message to KRnet-leave at list.krnet.org >> please see other KRnet info at http://www.krnet.org/info.html >> see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to >> change options >> >> >> > > _______________________________________________ > Search the KRnet Archives at http://tugantek.com/archmailv2-kr/search. > To UNsubscribe from KRnet, send a message to KRnet-leave at list.krnet.org > please see other KRnet info at http://www.krnet.org/info.html > see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change > options >
