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Malcolmbru(at)aol.com
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 Posted: Tue Sep 19, 2006 5:45 pm Post subject: Short Takeoff DAVE |
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I have a KF2 what is flaperon differential? how do I know if I have it? my 2 was finished in 2000 michigan kit foxer
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Lynn Matteson
Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan
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| Posted: Tue Sep 19, 2006 7:09 pm Post subject: Short Takeoff DAVE |
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Apply the flaperons to one side or the other and see how much one side
goes up versus the other side going down. Differential means that one
side moves more or less than the other. In the Kitfox...as with most
planes that I know of...the up-going aileron/flaperon moves further
than the down-going one. This is so that the adverse yaw is reduced. If
both flaperons moved the same amount, the nose of the plane would move
opposite to the direction of the intended bank, and you would have a
BUNCH of adverse yaw. We still have some in the Kitfox's, but I believe
in the model IV's they reduced the adverse yaw a significant amount
with flaperon differential.
Lynn
On Tuesday, September 19, 2006, at 09:45 PM, Malcolmbru(at)aol.com wrote:
| Quote: | I have a KF2 what is flaperon differential? how do I know if I have
it? my 2 was finished in 2000 michigan kit foxer
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Lynn
Kitfox IV-Jabiru 2200
N369LM |
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Richard Rabbers
Joined: 09 Jan 2006
Posts: 114
Location: Benton Harbor, MI - USA
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| Posted: Tue Sep 19, 2006 7:57 pm Post subject: Re: Short Takeoff DAVE |
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I believe that differential flaperon travel was intruduced with the model IV.
Various tweaks larger rudder, longer fuse.. provided more effective directional control, but I was told that more than 'normal' rudder was needed to overcome adverse yaw on my model I. The plane would just fly yawed, until correction was applied.
Malcolm.
How does your model II respond?
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Richard in SW Michigan
Model 1 / 618 - full-lotus floats (restoration) |
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dave(at)cfisher.com
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| Posted: Wed Sep 20, 2006 4:07 am Post subject: Short Takeoff DAVE |
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Lynn you are right and the ratio seems to be about 2 to 1 and it greatly
reduces the adverse yaw.
Plus I don't think there is any chance of flapperon reversal as there was a
cahnce on early models if you went over about 15 degrees.
The IV also used a larger chord flapperon as well as a symetrical one. With
that being said the IV model can get more degrees of flap down although alot
have limited theirs to 20 degrees or so. The only real benefit for the
extra 10 to 15 degree not using a limiter is that you will get alot more
lift and quicker takeoff with 30 to 35 degrees of flapperons but with that
comes extra drag and you will want to bleed them off slowly as you get out
of ground effect.
I another trick would be to use full flap deflection just prior to lift off
to get that extra "pop" , This is a real attribute for float flyers and even
landplanes.
For a short field take off goes like this --- Brakes on when they work --
tail up -- NO FLAPS - WIDE OPEN THROTTLE
Start your roll and tail will likely fall a bit -- stick full ahead to keep
tail up and alter your stick to keep your wing at about a zero angle off
attack.
when it ready ( about 30 IAS ) full FLAPS - I Mean FULL 30 to 35
Degrees and aft stick
once airbourne the full flaps will not allow the best acceleration so start
to bleed them off slowly to 20 degrees or so and will will be going up in a
hurry.
I routinely take off this way , does anyone else use this method ?
Maybe we should all do some videos and post them for others to share some
good tips on improving all of our Kitfox Flight qualities?
Dave
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Ben-PA
Joined: 11 Jan 2006
Posts: 44
Location: Berwick, Pa
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| Posted: Wed Sep 20, 2006 4:44 am Post subject: Re: Short Takeoff DAVE |
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| dave(at)cfisher.com wrote: |
......For a short field take off goes like this --- Brakes on when they work --
tail up -- NO FLAPS - WIDE OPEN THROTTLE
Start your roll and tail will likely fall a bit -- stick full ahead to keep
tail up and alter your stick to keep your wing at about a zero angle off
attack. when it ready ( about 30 IAS ) full FLAPS - I Mean FULL 30 to 35 Degrees and aft stick once airbourne the full flaps will not allow the best acceleration so start to bleed them off slowly to 20 degrees or so and will will be going up in a hurry.
I routinely take off this way , does anyone else use this method ?
Maybe we should all do some videos and post them for others to share some good tips on improving all of our Kitfox Flight qualities?
Dave--- |
I'm glad to hear of this technique, Dave. I am still a student pilot and wanted to take off w/full flaps but was concerned about the nose down pitch. Do you find that pulling full flaps wants to plant the nose in the dirt? I have a Model 5 and the nose really pitches down if I pull them at altititude. I usually take off with half flaps. If I can get off quicker with full flaps, I will add some pitch to my prop for cruise.
I have a friend with a Pacer who uses the pull-the-flaps-technique you described.
Thanks!
Ben
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cliffh(at)outdrs.net
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| Posted: Wed Sep 20, 2006 5:54 am Post subject: Short Takeoff DAVE |
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This is standard short field take off in Super Cubs and Cessna 180s
Floran H.
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dave(at)cfisher.com
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