Good day Colin. Would you happen to have a couple close up pictures of the tail wheel on your KR-2 ?
Thanks Jamie :) Sent from my iPhone > On Mar 2, 2023, at 3:13 PM, MS <propbala...@att.net> wrote: > > > Having flown aft-cg most of the time in my bush work, especially in Africa, > I'm not as sensitive to the issue qs Colin. It does make the elevator more > sensitive and the plane less "stable" which requires one to stay on top of > the elevator with more attention and to give a few extra knots to approach > and landing but aft-cg to start with empty is not something to build into the > basic structure. You need to have an even starting point before loading it > with stuff. > > More important than the vert stab which is fine as per plans is the rudder, > which I've always found to also be fine as per plans. A little more wouldn't > hurt but the standard has always been sufficient for stiff crosswinds. I've > never found it to be lacking in authority for takeoff either. It's strong > crosswinds that can be the problem although as I've mentioned, it's fine as > is. Re takeoffs, Ken Rand was taking off at FlaBob in the early days and got > blown into the airport boundary fence on takeoff so perhaps he enlarged it in > further designs or perhaps he was just careless that day. FlaBob gets strong > winds coming in from the desert and can be turbulent. > > Just noticed the subject of this post is "Horizontal stabilizer KR-2". My > response has been as if the subject was "Vertical Stabilizer & Rudder". > Sorry. > > Mike Stirewalt > KSEE > > > > > > On Wednesday, March 1, 2023 at 06:12:56 PM PST, colin hales via KRnet > <krnet@list.krnet.org> wrote: > > > Hi Jamie, > > With regards to solid proven advice, I can solidly say, I didn't extend the > fin forward. I don't have any stability issues so my advice is that there is > no need to extend the fin. But if you want to extend forward the fin an inch > or two, I can't see any harm. > > But I am blue in the face because I say this until I am blue in the face, > stability is all to do with centre of gravity. The standard KR2 might be > pitch sensitive to those who fly jumbo's but there are no yaw issues with the > plane. > > Far more of an issue is engine torque. Depending on how much power you will > have will depend on how much corrective rudder you need to counteract engine > torque, adding to the fin isn't going to help that one bit. Since there is no > offset built into the fin, as there is on many other aircraft, size is not > really an issue. > > For clarification, some aircraft have the fin offset to counteract > permanently engine torque, so you don't need a rudder trim tab or to keep so > much rudder in when taking off or climbing with full power. The KR2 fin is > set in line with the fuselage centre line for simplicity. Also, VW engines > you need to offset the fin to the right, Continetal or lycoming, off to the > left, because they rotate in opposite directions. So to save confusion, on > such a plane where engine choice is open, the fin is set down the middle with > no offset. > > I came across a Midget Mustang where the owner cursed it because he could > never keep it straight on take off. I was asked to look into it and quickly > discovered that the original builder of many previous owners had put the fin > offset bracket on the wrong way. Swapping it around made the pilot a lot > happier. > > So my personal advice is to build it light and keep a forward C of G and > keep to the plans. One less issue for your inspector to study. Where I live, > that type of deviation from the plans would require lots of paperwork. > > I know this hasn't answered your question perfectly, but the advice is sound. > > > CH. > -- > KRnet mailing list > KRnet@list.krnet.org > https://list.krnet.org/mailman/listinfo/krnet > -- > KRnet mailing list > KRnet@list.krnet.org > https://list.krnet.org/mailman/listinfo/krnet
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