Everybody thanks for the reply. We gonne use the 8 till 14 range. I think with our leadingedge fuel thanks this should not a problem. Then result of the weight mesurment is 198 kg without engine. But we calculaties the pant and filter in it. All the instrument And seatbelts radio's enz enz. I think we can be happy with this result. Now the calculations can be started. I can use the sheet of the kr net. ( with my own dimension) Thanks Stef
-- Steph and his dad are building the KR-2S see http://www.masttotaalconcept.nl/kr2 >----Origineel Bericht---- >Van : krnet at list.krnet.org >Datum : 20/08/2015 01:27 >Aan : krnet at list.krnet.org >Cc : john_martindale at bigpond.com >Onderwerp : Re: KR> weight and balance > >Hi Sid > >It is not that the centre of lift for the RAF48 wing has been inaccurately >mapped. That would have been well calculated by the wing designers (not Stu >Robinson) and has little or nothing to do with the aircraft it is put on. >Rather the issue is that the CoG envelope for the KR2 was set too broadly >and perhaps somewhat arbitrarily at 8" to 16". > >We know that flight in the rear 2" or so has whiskers on it and in fact in >Australia in the early days the authorities downright banned it. > >However, this does not mean that the forward limit at 8" is also incorrect. >I think reducing it to 6" may be ill advised without proper analysis and you >may find difficulty in raising the nose at low airspeeds such as in the >flare. > >As I have explained previously you cannot simply equate Centre of Lift with >Centre of Gravity because the balance is the outcome of four vectors, the >other two being thrust and drag. Further, the CoL varies with Angle of >Attack and at the stall moves backwards lending support to a nose down >tendency that aids in recovery. If the CoL is actually 2" further forward as >you claim then this design aspect would be compromised. > >I suspect the problem with your aircraft is not the CoL but the fact that it >was tail heavy and too far back in the envelope as you have correctly >addressed. It is not necessarily to do with an inaccurate mapping of the >CoL. Please do not blame the designer for what is essentially a construction >error. There are many KR2s flying without a problem and have been for years. > > >Cheers 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 Sid Wood via >KRnet >Sent: Wednesday, 19 August 2015 5:54 AM >To: krnet at list.krnet.org >Cc: Sid Wood >Subject: Re: KR> weight and balance > >The KR-2 Plans have a serious error regarding Weight & Balance. The >designer, Stu Robinson, chose the RAF48 Center >of Lift 2 inches to far forward......snip > > > >----- >No virus found in this message. >Checked by AVG - www.avg.com >Version: 2015.0.6125 / Virus Database: 4401/10469 - Release Date: 08/19/15 > > >_______________________________________________ >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 >
