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Float on landing

 
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kerrjohna(at)comcast.net
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PostPosted: Fri Sep 07, 2007 8:33 am    Post subject: Float on landing Reply with quote
after a lengthy discussion on the Kitfox list regarding float on landing and doing some testing in my kitfox to determine the efficacy of maintaining 1.3 times stall speed on approach I decided to try the same thing with the RV9.

I climbed to pattern altitude plus 2000 feet and configured for landing: full flaps 1200 rpm. With this setup I practiced a variety of manuevers that might be required in landing while maintaining 65IAS. The RV9 was perfectly stable in all manuevers and indicated 400-450 rate of decent.

With regained confidence I returned to the pattern a proceded to make a couple of landings. Again holding 65IAS as precisely as possible I had two of the best landings in a long time. Gone was the hunting for the ground while excess speed bled off.

Flying can really be a Zen experience.

John Kerr
Logan UT
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chenoweth(at)gwi.net
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PostPosted: Sat Sep 08, 2007 4:23 am    Post subject: Float on landing Reply with quote
Bill,
Like John I'm also a Kitfox builder/flyer so my frame of reference is that. When you say "back comes the power" what do you mean? In my case I go to idle, stay high, slip to landing without flaps, and almost never touch the power. In something over 300 hours that has worked well. I'm using two-stroke power and consider this landing technique good practice in case of a power failure. I'm with him on the 1.3 and then a bit less on short final.

My assumption is that this technique (idle power and slips) will not be appropriate with the 9, right? Also, are you three-pointing, wheel landing, or something else. I'm using what amounts to a barely flying three-point.

And, thanks for the gap seal info.
Bill


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aurbo(at)ak.net
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PostPosted: Sat Sep 08, 2007 8:20 am    Post subject: Float on landing Reply with quote
Bill,

Abeam the numbers, what throttle setting are you using? How many RPM's.

Do you know how many RPM's it is that simulates "zero thrust" in the 9?

Have you done any "wheel landings" yet?

Mike
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ceengland(at)bellsouth.ne
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PostPosted: Sat Sep 08, 2007 12:22 pm    Post subject: Float on landing Reply with quote
Chenoweth wrote:
Quote:
Bill,
Like John I'm also a Kitfox builder/flyer so my frame of reference is
that. When you say "back comes the power" what do you mean? In my case
I go to idle, stay high, slip to landing without flaps, and almost never
touch the power. In something over 300 hours that has worked well. I'm
using two-stroke power and consider this landing technique good practice
in case of a power failure. I'm with him on the 1.3 and then a bit less
on short final.

My assumption is that this technique (idle power and slips) will not be
appropriate with the 9, right? Also, are you three-pointing, wheel
landing, or something else. I'm using what amounts to a barely flying
three-point.

And, thanks for the gap seal info.
Bill

Can't speak for the -9, but it works for Luscombe 8A, Globe/Temco Swift,

C-150 taildragger, Thorp T-18, RV-4, BD-4...And it works works with or
without flaps on the planes that have flaps. (There are a few certified
planes that placard against slips with full flaps.) My biggest gripe
about the -4 is that the rudder is too small to get a decent slip. (I
learned to fly in the Luscombe.) Smile

My experience with the -4 & fixed pitch prop is that anything over an
idle setting (with idle speed set below 700rpm) will result in almost
endless float. The -4 will fly until you run out of gas at around
1500rpm. Anything over ~70mph/60kts results in long rides above the
runway, even at idle power. I'd expect the -9 to be much worse at those
speeds.

*A constant speed prop changes everything.*

Charlie

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