The Murphy Builders Site

Just a quick note to advise that I had changed Howard's angle of attack, on
1800 amphib floats, from 2 degrees to 2.7 degrees (lowered one bolt hole on
the rear top attach fitting) while he was away on a holiday and he flew it
home today and did some playing around. He says it lands much nicer onto the
steps sweet spot and when taking off he can now fully rotate without hitting
the tails of the floats on the water. You wouldn't think that 0.7* would
make much difference, but Howard is amazed at the difference.

This measurement is of course the difference between using the float top as
ZERO and the bottom of the cabin floor in a nose high attitude. I believe we
are to add 4 degrees to this to get the true angle of attack, to the
theoretical cord line, so this would actually be 6.7 degrees.

Regards,
Wayne






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That's very interesting. I mounted my floats last year,
and if I remember correctly, set mine at 2.5 degrees. I
believe MAM's last plane on floats, the Elite, was set
at 2.1. I left my struts with available bolt holes up
or down, so I could do some further adjustments on mine
as well if needed. At least, now I know not to try with
less of an angle. Now I wander if it might be worth
trying 3 degrees.

Currently, I do find a huge range in my take-off times
depending on weight and wind. If lightly loaded and a
strong wind, I can be off in 10 seconds, but if heavily
loaded and no wind, it can be 25 seconds and more. The
other thing I learned, was to do a quick pump up of my
wheels just before take-off, as sometimes there is a
leak down of cylinders, and I'm sure one of the rear
wheels drags down below the step a bit.

Walter

-----Original Message-----
From: murphy-rebel@dcsol.com
[mailto:murphy-rebel@dcsol.com]On Behalf Of
Wayne G. O'Shea
Sent: Wednesday, October 02, 2002 11:09 AM
To: murphy-rebel@dcsol.com
Subject: Rebel -Float installation - angle of attack


Just a quick note to advise that I had changed Howard's
angle of attack, on
1800 amphib floats, from 2 degrees to 2.7 degrees
(lowered one bolt hole on
the rear top attach fitting) while he was away on a
holiday and he flew it
home today and did some playing around. He says it
lands much nicer onto the
steps sweet spot and when taking off he can now fully
rotate without hitting
the tails of the floats on the water. You wouldn't
think that 0.7* would
make much difference, but Howard is amazed at the
difference.

This measurement is of course the difference between
using the float top as
ZERO and the bottom of the cabin floor in a nose high
attitude. I believe we
are to add 4 degrees to this to get the true angle of
attack, to the
theoretical cord line, so this would actually be 6.7
degrees.

Regards,
Wayne




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Howard does NOT have the McKenzie STOL kit, is that correct?
Ken

"Wayne G. O'Shea" wrote:

Just a quick note to advise that I had changed Howard's angle of attack, on
1800 amphib floats, from 2 degrees to 2.7 degrees (lowered one bolt hole on
the rear top attach fitting) while he was away on a holiday and he flew it
home today and did some playing around. He says it lands much nicer onto the
steps sweet spot and when taking off he can now fully rotate without hitting
the tails of the floats on the water. You wouldn't think that 0.7* would
make much difference, but Howard is amazed at the difference.

This measurement is of course the difference between using the float top as
ZERO and the bottom of the cabin floor in a nose high attitude. I believe we
are to add 4 degrees to this to get the true angle of attack, to the
theoretical cord line, so this would actually be 6.7 degrees.

Regards,
Wayne

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That's right Ken, no STOL kit on Howard's and FWIW Jack Weibe returned his
aircraft
to a lower nose attitude after trying a more nose up attitude. He didn't
like the way it jumped off the water!!

Wayne

On 10/11/02 10:28 AM, KLEHMAN@ALBEDO.NET wrote to MURPHY-REBEL:

-> Howard does NOT have the McKenzie STOL kit, is that correct?
-> Ken
->
-> "Wayne G. O'Shea" wrote:
-> >
-> > Just a quick note to advise that I had changed Howard's angle of attack,
on
-> > 1800 amphib floats, from 2 degrees to 2.7 degrees (lowered one bolt hole
on
-> > the rear top attach fitting) while he was away on a holiday and he flew it
-> > home today and did some playing around. He says it lands much nicer onto
the
-> > steps sweet spot and when taking off he can now fully rotate without
hitting
-> > the tails of the floats on the water. You wouldn't think that 0.7* would
-> > make much difference, but Howard is amazed at the difference.
-> >
-> > This measurement is of course the difference between using the float top
as
-> > ZERO and the bottom of the cabin floor in a nose high attitude. I believe
we
-> > are to add 4 degrees to this to get the true angle of attack, to the
-> > theoretical cord line, so this would actually be 6.7 degrees.
-> >
-> > Regards,
-> > Wayne
->





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