Bill,
Thanks for the info. please keep me posted. This one airplane has a
very low canopy, but the original length with the small tail. The
wings are Diehls. Keep me informed, as I certainly don't have the
qualifications of your test pilot, but have to fly this in a similiar
configuration to yours. Bobby
> Bobby, My pilot is a high time (18,000 hr.) pilot, test pilot for the
> Raspet
> Flight Research Lab at Mississippi State University with experience in
> hundreds of aircraft. He has experienced this before in the "Marvel"
> research aircraft where the wing area was increased without proportionally
> increasing the horizonatal stabilizer area. This occurred at that time.
> The
> horizontal stabilizer area was increased and the problem was solved. It
> became stable through full stall. You might like to communicate with some
> other KR-2 builders who did build a true airfoil horizontal stabilizer
> (not
> flat on top) and seek their opinion. My problem could be caused by the
> changes I make in the fuselage. My canopy sits 3-4 inches higher than the
> standard, it is very sleek with very little drag. I used a dragonfly
> canopy
> and built the turtle deck to fit. (I get 135 mph indicated at 2800 rpm).
> After I put wheel pants on it and some fairings elsewhere I hope I will
> get
> a little higher MPH.
> Thanks for your interest. I will keep you posted as to the results of
> increasing the area of my horizontal stab.
> Bill Page
> boliverp...@bellsouth.net
>
> ----- Original Message -----
> From: <bo...@hatconversions.com>
> To: "KRnet" <kr...@mylist.net>
> Sent: Thursday, April 13, 2006 7:19 PM
> Subject: Re: KR> Horizontal stab stall
>
>
>> Bill,
>> I spent lots of time in my Mustang II with guys that were used to
>> flying General Aviation aircraft. Every one wanted to fly it. In all
>> the time I had it (800+hours) I can't remember anyone that was
>> successful at a stall sequence the first time. With out fail,
>> everyone over controlled it going into the stall, and more critical,
>> coming out. We either ended up in an accelerated stall or a couple of
>> times it actually snapped upside down.
>> Don't know what your qualifications are, but is there a chance it
>> would be worth letting a high time experimental pilot test fly it, or
>> maybe get one of the active KR2 guys to come fly it for you?
>>
>> The reason I am asking these questions is I have an original
>> fuselage
>> with a set of Diehl wings almost ready to fly. Keep us updated.
>> Bobby
>>
>>
>>
>>
>>
>>
>> Bill,
>>> KR-netters
>>>
>>> After consulting with the Aerospace Department at Mississippi State
>>> University concerning the pitching up of my KR-2 upon stall approach, a
>>> probable cause has been reached. The Horizontal Stabilizer is stalling
>>> prior to the wing stall. This may be caused by the longer wing by Dan
>>> Deihl. This creates a very dangerous condition. There are three ways to
>>> prevent this condition. (1) Increase the stabilizer area by increasing
>>> by
>>> several inches the length of the stab. The standard flat stabilizer is
>>> only about 50% as efficient as a stabilizer with a true airfoil which
>>> leads to the 2nd method of prevention. (2) Change the stab airfoil to a
>>> true airfoil which will increase the efficiency of the stab. And (3),
>>> Don't stall the aircraft, keep the airspeed well above stall.
>>> It has been noticed that some KR-2 builders constructed a true airfoil
>>> rather than the flat stab shown in the plans. Maybe it should be noted
>>> to
>>> other KR builders to do the same.
>>> You guys who have true airfoil stabs, where did you get your plans,
>>> technical info., etc. I would like to change my stab to a true airfoil.
>>>
>>> Maybe if I put Armorall on my horizontal stabilizer my problem will be
>>> solved.
>>>
>>> I'm still finding dingle berrys after that close call.
>>>
>>> Bill Page
>>> boliverp...@bellsouth.net
>>> _______________________________________
>>> Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp
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>>> please see other KRnet info at http://www.krnet.org/info.html
>>>
>>
>>
>> _______________________________________
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>>
>
>
>
> _______________________________________
> Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp
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> please see other KRnet info at http://www.krnet.org/info.html
>
