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pj.ladd(at)btinternet.com
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 Posted: Sun Jan 20, 2013 3:31 am Post subject: Aileron trim-drag question |
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Hi Beauford,
your mention of the flying qualities of an 8x4 plywood sheet,plus the foot of snow outside my window at the moment reminded me of this.
Many years ago, certainly 50, we had a long and hard winter (by UK standards). Snow was deep and persisted for some time.
I lived at the edge of Salisbury Plain with lovely snow covered slopes.
The family ran a builders merchant so with a couple of small hardboard sheets, about 4x2 , pinched from stock, my brother and I launched ourselves across the snow. In a sitting position with a bit of sash cord holding the leading edge up we proved the theory sound..
Next question. Will it be better with a larger board?. Will we go faster lying down.?
In increments we increased the board size until we arrived at 8ftx4ft board, and a prone position holding up the leading edge with our hands.
In the meantime the snow had hardened, become more icy, and more slippery.
I launched from farther up the hill than ever before and immediately hit the highest speed yet. Also on the larger board I could not drag my toes in the snow to brake.
Speed built up, the bumps seemed to flatten out, I was holding the leading edge up and sure enough, up she came.Flipped into a roll and dumped me on my back going a rate of knots. The board disappeared down the hill.
Nothing was broken but we confined our efforts to a 6x4 board afterwards.
I wish I still had that body which just bounced. If I did it now I would be in hospital for a couple of weeks.
Happy days
Pat
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pj.ladd(at)btinternet.com
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| Posted: Sun Jan 20, 2013 3:45 am Post subject: Aileron trim-drag question |
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I had a roll trim issue on my VW powered MKIIIC but decided to fix it with the optional Kolb adjustable rear attachment fitting. >>
Hi Rick,
I had the same on my Xtra and fixed it the same way. Just the way the designer intended.
With the Hauck mod. to correct for sitting off the centre line she shows no tendency to roll at all.
Pat
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Richard Pike
Joined: 09 Jan 2006
Posts: 1671
Location: Blountville, Tennessee
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| Posted: Sun Jan 20, 2013 5:06 am Post subject: Re: Aileron trim-drag question |
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When I rebuilt the FSII after its wadding up event, I tried one of the Kolb adjustable rear spar attachment brackets, and it was reasonably successful. The airplane flies square in the bubble hands off, but it did still require a small trim tab on one aileron. No longer required one on the rudder, the spar bracket adjustment made that one unnecessary.
As a side note, by adding some dihedral, a FSII can readily be trimmed to fly hands off. Dihedral does not enable a MKIII to do this.
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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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byoungplumbing(at)gmail.c
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| Posted: Sun Jan 20, 2013 7:14 am Post subject: Aileron trim-drag question |
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when I rebuilt, I increased the dihedral a bit and my mkiii went from
negative roll stability to neutral roll stability... I believe that if I
had increased the dihedral a bit more it would have gone positive.
boyd young
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