KR> Mains possition
Hi Barry I'm no aeronautical engineer but it seems to me you need to get more weight forward of the CoG and this is not achieved by moving the wheels. Once the wheels have left the ground their position becomes irrelevant and if you can't get the tail up with forward stick at that point then it is because the CoG is too far back or your elevator is rigged wrongly or too small to be effective. Wheel location is more to do with tendency to ground loop I think because if the CoG is too far behind the axles then it can more easily overtake the wheels in a loop. I just feel a bit uneasy about your solution and suggest some expert advice might be timely. Regards John John Martindale 29 Jane Circuit Toormina NSW 2452 AUSTRALIA ph: 61 2 6658 4767 mobile: 0403 432179 email: john_martind...@bigpond.com -Original Message- From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net] On Behalf Of Barry Kruyssen Sent: Monday, 12 July 2010 8:07 AM To: 'KRnet' Subject: KR> Mains possition Hi When I crashed my KR2 4 years ago, during the rebuild I move the mains forward to give more weight on the tail wheel when empty. This worked fine solo. 2 up there is too much weight behind the CofG and the main wing started to fly before the tail plane. Full forward stick and the tail was still on the ground and with the angle of attack and ground affect the aircraft lifted off the ground in a very nose high attitude and mushed there, tail still on the ground. I pulled the power and it flopped back on the ground. No one hurt, no damage to the KR2. I need to move the mains back, but how far? The question to you tail dragger builders with non stock KR2 undercarriage, is how far in front of the CENTER of the CofG is the center of the axle with the plane in the flying attitude? Thanks Barry Kruyssen k...@bigpond.com ___ 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 No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.830 / Virus Database: 271.1.1/2997 - Release Date: 07/12/10 04:36:00
KR> Mains possition
At 05:07 PM 7/11/2010, you wrote: >The question to you tail dragger builders with non stock KR2 undercarriage, >is how far in front of the CENTER of the CofG is the center of the axle with >the plane in the flying attitude? >Barry Kruyssen ++ I checked my "Tony Bingelis" books, before we lost power and lights in storm that rolled through, and he says the rule of thumb is as follows: Plane in level flying attitude, find the point (on the top longeron in our case) for the C.of G. From that point drop a line to the floor at an angle in the range of 15 to 20 degrees forward. That would / should be the contact point of the tire to the ground for the main gear on a conventional geared aircraft. I think ( going from memory here) that my axle is pretty much in line with the lead edge of my wing. With an airplane as light as a KR, where the pilot is such a high percentage of the gross weight, you will probably have to settle for light tail weight with no one on board. Whenever I carry a passenger, I always make sure I can get the tail up well before lift off to insure I have a flyable airplane. Remember, my opinion is worth what you pay for it. :-) Larry Flesner
KR> Mains possition
Hi When I crashed my KR2 4 years ago, during the rebuild I move the mains forward to give more weight on the tail wheel when empty. This worked fine solo. 2 up there is too much weight behind the CofG and the main wing started to fly before the tail plane. Full forward stick and the tail was still on the ground and with the angle of attack and ground affect the aircraft lifted off the ground in a very nose high attitude and mushed there, tail still on the ground. I pulled the power and it flopped back on the ground. No one hurt, no damage to the KR2. I need to move the mains back, but how far? The question to you tail dragger builders with non stock KR2 undercarriage, is how far in front of the CENTER of the CofG is the center of the axle with the plane in the flying attitude? Thanks Barry Kruyssen k...@bigpond.com
