> [Original Message]
> From: Mark Jones <flyk...@charter.net>
> To: KR Net <kr...@mylist.net>
> Date: 4/10/2011 8:39:07 AM
> Subject: Re: KR> Tri gear tail first on runway
>
>
>
> Ok, for the full story see the e-mails below. I am larger than the
average
> KR pilot and when I built my KR I took this into consideration. I added
two
> inches in fuselage length forward of the main spar thus moving the
firewall
> forward. This resulted in a CG range measured from the datum (forward
tip
> of
> spinner) of 62 to 70 inches. My CG is not in the aft range nor is it it
> anywhere close to it. With full tanks my CG is at 64.2 inches and at
empty
> tanks it only moves forward to 63.2 inches. I have no header tank. If I
fly
> a 150lb passenger with full tanks the CG is at 66 and empty it is at
65.4.
> The only time I have hit the tail was when I approached landing at a very
> steep angle and at a very slow speed. My tail tie down ring sticks down
> about 2 inches. My wing incidence is set at the specs for the AS504x
> airfoil. I never hit my tail anymore.
>
> Mark Jones (N886MJ)
> Stevens Point, WI
> E-mail: flyk...@charter.net
> Web: www.flykr2s.com
>
>
>
> > ----- Original Message -----
> > From: "Larry&Sallie Flesner" <fles...@frontier.com>
> > To: "KRnet" <kr...@mylist.net>
> > Sent: Thursday, April 07, 2011 3:51 PM
> > Subject: KR> Tri gear tail first on runway
> >
> >
> >
> >>
> >>I have a tri-gear plans-built KR-2 with standard Diehl gear. Stub wing
is
> >>set at 3.5 degrees AOA in level attitude. With the tail skid pushed
down
> >>5
> >>inches off the level concrete, my inclinometer shows an AOA of 14
degrees.
> >>With the tail skid on the concrete the AOA goes to 17.5 degrees. My
> >>conclusion: I would stall the wing before the tail skid touches the
> >>runway.
> >>Not accounted for is the low wing ground effect, static load on the
gear
> >>and
> >>use of flaps on the above data versus actual flight performance. I
> >>suppose
> >>it would be possible to momentarily touch the skid to the runway by over
> >>controlling with PIO. Another possibility is planting the tail on the
> >>runway with max aft cg and full elevator deflection.
> >>Sid Wood
> >
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+++++++++++
> >
> >
> > Mark Jones was the individual that posted saying he has had his tail
> > touch on landing. His KR is a 2S so the longer fuselage would be
> > closer to the ground in the same attitude. He is also flying the
> > "new" foil and I have no idea what the "critical AOA" is on it. If
> > he followed Langford's suggestion, he may have set his wing at less
> > than 3.5 degrees, maybe closer to 2.0 degrees. I'm guessing his tail
> > tie down ring is 1.5 inches in diameter. Also, if he hasn't lost
> > weight since the last Gathering, his CG is a bit aft. :-) (sorry
> > Mark, couldn't pass that one up. I'll owe you a beer at the next
> > Gathering )
> >
> > Larry Flesner
> >
> >
> > _______________________________________
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> >
>
>
>
> _______________________________________
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