Float angle vs Cruise Speed

[Walter Klatt]

OK, will let you know if I do, but will not likely be
before the end of the summer. I have a few trips
planned for the next 2 months, and won't have a lot of
time for experimenting. And of course, if YOU do it,
we'll want to hear from you...

Walter

-----Original Message-----
From: mike.davis@dcsol.com
[mailto:mike.davis@dcsol.com]On Behalf Of
Wayne G. O'Shea
Sent: Sunday, June 22, 2003 4:17 PM
To: murphy-rebel@dcsol.com
Subject: Float angle vs Cruise Speed


I mounted Howard's at 2.6* last fall as
well. He was about 2.1 before if I
remember correctly, but I never asked him if
he picked up any speed.

As for FOKM, it was mounted pretty flat on
the 1500's (less than 2* to the
belly I'm sure) so now with it going to 2.6*
in flight the floats are now
slightly nose down in level flight cruise. I
have the feeling that this
makes them similar to putting the flaperons
in reflex and takes some lift
out of the floats (the air is now seeing a
wedge shape........ instead of
the air hitting more under the nose of the
floats when they were flatter).
Less lift = less drag = higher cruise!! It's
a fair amount too, as it only
did about 92 to 94 MPH with the wheels up on
the 1500's and now it's happy
to do 100mph.

If you drop a bolt down on the back to check
things out let us know what
happens to your speed Walter!! When I did
Howard's I thought I would have to
make new rear X-cables, but really the
overall distance doesn't change more
than 1/16ths of an inch by dropping a full
hole and all I had to do was
loosen the TB's to drop and then tighten
back up and safety.

Cheers,
Wayne

----- Original Message -----
From: "Walter Klatt" <walter.klatt@shaw.ca>
To: <murphy-rebel@dcsol.com>
Sent: Sunday, June 22, 2003 3:25 PM
Subject: RE: Great way to spend a Friday!

Hmmm, very interesting that you observed

higher cruise

with more negative angle on your floats. I

would have

thought it would be the other way around. Mine are
about -2.5 (as best I can measure) and was

considering

lowering the rear struts one hole which

should put them

closer to -3. That may further improve

take off due to

the higher angle of attack when at the

sweet spot on

water. However, it was my understanding that the
trade-off was slower cruise because of more drag.

Did I see a past post where you set

Howard's to -2.9 or

so? Do you know what happened to his cruise?

I am pretty happy with both my take off and cruise
right now, but am always interested in

more performance

if it can be had.

Walter (grounded today with rain and low cloud)

-----Original Message-----
From: mike.davis@dcsol.com
[mailto:mike.davis@dcsol.com]On Behalf Of
Wayne G. O'Shea
Sent: Friday, June 20, 2003 4:32 PM
To: murphy-rebel@dcsol.com
Subject: Great way to spend a Friday!

Flies like a dream and
is even quicker now in cruise
with the floats mounted at -2.6* to the
belly vs a much flatter mount when
it was on the "1500's".

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[Wayne G. O'Shea]

I mounted Howard's at 2.6* last fall as well. He was about 2.1 before if I
remember correctly, but I never asked him if he picked up any speed.

As for FOKM, it was mounted pretty flat on the 1500's (less than 2* to the
belly I'm sure) so now with it going to 2.6* in flight the floats are now
slightly nose down in level flight cruise. I have the feeling that this
makes them similar to putting the flaperons in reflex and takes some lift
out of the floats (the air is now seeing a wedge shape........ instead of
the air hitting more under the nose of the floats when they were flatter).
Less lift = less drag = higher cruise!! It's a fair amount too, as it only
did about 92 to 94 MPH with the wheels up on the 1500's and now it's happy
to do 100mph.

If you drop a bolt down on the back to check things out let us know what
happens to your speed Walter!! When I did Howard's I thought I would have to
make new rear X-cables, but really the overall distance doesn't change more
than 1/16ths of an inch by dropping a full hole and all I had to do was
loosen the TB's to drop and then tighten back up and safety.

Cheers,
Wayne

----- Original Message -----
From: "Walter Klatt" <walter.klatt@shaw.ca>
To: <murphy-rebel@dcsol.com>
Sent: Sunday, June 22, 2003 3:25 PM
Subject: RE: Great way to spend a Friday!

Hmmm, very interesting that you observed higher cruise
with more negative angle on your floats. I would have
thought it would be the other way around. Mine are
about -2.5 (as best I can measure) and was considering
lowering the rear struts one hole which should put them
closer to -3. That may further improve take off due to
the higher angle of attack when at the sweet spot on
water. However, it was my understanding that the
trade-off was slower cruise because of more drag.

Did I see a past post where you set Howard's to -2.9 or
so? Do you know what happened to his cruise?

I am pretty happy with both my take off and cruise
right now, but am always interested in more performance
if it can be had.

Walter (grounded today with rain and low cloud)

-----Original Message-----
From: mike.davis@dcsol.com
[mailto:mike.davis@dcsol.com]On Behalf Of
Wayne G. O'Shea
Sent: Friday, June 20, 2003 4:32 PM
To: murphy-rebel@dcsol.com
Subject: Great way to spend a Friday!

Flies like a dream and
is even quicker now in cruise
with the floats mounted at -2.6* to the
belly vs a much flatter mount when
it was on the "1500's".

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