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victorbravo(at)sbcglobal.
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 Posted: Sat Jun 04, 2016 11:56 pm Post subject: Counterbalance / Kolb Modifications |
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Racer Jerry, thank you again. I did indeed find the later addendum in the plans that shows the aileron counterbalance. The information and drawing was right where you said they would be, on Page 24.
So that now verifies what I had suspected, the FireStar does indeed need and/or benefit from the counterbalances. So whether I build stock ailerons or center-driven ailerons, they need to be balanced.
Just to be able to calibrate myself and stay out of trouble, would one of the more experienced members on this list please post a detailed listing of which modifications are OK for me to discuss here and which ones are not. I see several modifications mentioned by others, but it seems that it is a big problem when I want to discuss them.
Somebody give me a hand and explain which people are approved to talk about upgrading/strengnthening/problem-solving, and which problems or weak spots are approved to be mentioned or actually discussed. It's kind of mysterious to me.
Bill Berle
www.ezflaphandle.com - safety & performance upgrade for light aircraft
www.grantstar.net - winning proposals for non-profit and for-profit entities
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Richard Pike
Joined: 09 Jan 2006
Posts: 1671
Location: Blountville, Tennessee
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| Posted: Sun Jun 05, 2016 4:46 am Post subject: Re: Counterbalance / Kolb Modifications |
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If you are thick skinned enough, you can talk about anything you want. For instance, when I came out (pardon the expression) with putting my gas tank in the upper center section of the wing, I had several people crawl all over me because if I turned the airplane upside down in a bad crash, it would break the tank, and nobody with any sense would do it that way. Yeah, whatever, go look at some pictures of the deHaviland Tiger Moth.
In hindsight, spending the time & money to put the tank directly behind the seats would have been less hassle over the years, but as long as you keep ethanol away from it and use top quality fuel line, it does OK up top.
At one time vortex generators were a source of lively contention, but that seems to have settled down.
But none of that directly answers your question, so here goes: Unmentionable? Ferguson aircraft, period. Posting anything about the Fergy is like asking Muslims about the Fatherhood of God and the Sonship of Christ...
Restricted? Seafoam postings are only permissible on six month intervals.
Known problems? FS & FSII lower landing gear/axle fittings. Tubing wall is too thin and will break in a hard landing. Modify, update or plan on bad things to happen, your choice.
Early gear legs that don't go far enough up into the gear leg sockets. Hard landings will bend or break the socket.
Twinstar fuselages at the rear fuselage attach point are marginal. I have seen them break when abused. Not sure exactly why, perhaps the H section insert at that point is not the same as on the FSII? Don't know.
The MKIII horizontal tail does not have as much control authority as you would wish if you are carrying a heavy passenger and using a lot of flaps. A decent flare at low airspeeds (exacerbated by vortex generators) in this condition is very problematic. Solution is to gap seal the elevators to the stabilizers and add vg's the the underside of the horizontal stab.
The rudder post below the fuselage needs to be braced to support side loads generated by the tail wheel on rough ground.
That's all I can think of at the moment, maybe some of the other old timers can add to this list?
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_________________
Richard Pike
Kolb MKIII N420P (420ldPoops)
Kingsport, TN 3TN0
Forgiving is tough, being forgiven is wonderful, and God's grace really is amazing. |
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Rex Rodebush
Joined: 10 Jan 2006
Posts: 209
Location: Branson West area, Missouri
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| Posted: Sun Jun 05, 2016 9:00 am Post subject: Re: Counterbalance / Kolb Modifications |
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Just a comment on the Mark III horiz. stabilizers. I have an early Xtra in which a few months after I bought the kit the stabilizers were enlarged. Some time later they went back to the "standard size". I asked Norm at the time if I should change them back and he said don't bother. I have done a full stall landing with a 220# passenger. I weigh around 185#. No problems on the flair. Don't know if the larger stab. had any effect or not.
BTW. My CG is on the aft border line.
Rex
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patrickjladd(at)hotmail.c
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