Mounting 1800 Floats
Posted: Sat Feb 18, 2012 12:08 am
Bruce
The angle you refer to is called the throat angle. If you set your float
tops level, and use a smart level on your a /c floor, you should see a 2 to
3 degree nose up angle ( in relation to the floats)on your a / c. This
combined with the 3 degree angle of incidence of your wing will give you
aprox. 4.5 to 5 degrees throat.Rebels fly well with 5 degrees, and I have
flown them with 6 degrees. 4 would be as low as I would go, it will give you
a little more cruse speed, but make it slower off the water. one more thing
to look at, your float step should be at 45% wing cord in level flight. With
a / c in level flight attitude, mark 45 % cord on your wing, tape plumb bob
string at that point, plumb bob line should hit the step of the float.
I have flown both Rebels and Elete and SRs rigged this way and they work.
Changing strut length after the fact is easy with the extra holes Murphy
puts in the strut ends.
One thing I would recommend you do is to add something to your cable eyes to
keep them from closing, this can happen on rough water,and will loosen your
brace cables considerably.
hope this helps.
Keith
----- Original Message -----
From: <Legeorgen@aol.com>
To: <murphy-rebel@dcsol.com>
Sent: Friday, January 02, 2004 6:50 PM
Subject: Re: Mounting 1800 Floats
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The angle you refer to is called the throat angle. If you set your float
tops level, and use a smart level on your a /c floor, you should see a 2 to
3 degree nose up angle ( in relation to the floats)on your a / c. This
combined with the 3 degree angle of incidence of your wing will give you
aprox. 4.5 to 5 degrees throat.Rebels fly well with 5 degrees, and I have
flown them with 6 degrees. 4 would be as low as I would go, it will give you
a little more cruse speed, but make it slower off the water. one more thing
to look at, your float step should be at 45% wing cord in level flight. With
a / c in level flight attitude, mark 45 % cord on your wing, tape plumb bob
string at that point, plumb bob line should hit the step of the float.
I have flown both Rebels and Elete and SRs rigged this way and they work.
Changing strut length after the fact is easy with the extra holes Murphy
puts in the strut ends.
One thing I would recommend you do is to add something to your cable eyes to
keep them from closing, this can happen on rough water,and will loosen your
brace cables considerably.
hope this helps.
Keith
----- Original Message -----
From: <Legeorgen@aol.com>
To: <murphy-rebel@dcsol.com>
Sent: Friday, January 02, 2004 6:50 PM
Subject: Re: Mounting 1800 Floats
andI have the Rebel hoisted and all 4 float lift struts bolted to the floats
attackRebel. No diagonal struts yet. MAM manual says to check your angle of
tonow. I want 2.6*.
To check the angle of attack against the leveled floats I assumed I needed
andrest the aircraft on the struts first. As I began to lower the aircraft
therest all the weight on the lift struts (no diagonal struts yet) everything
begins to tilt back and the rear struts are no longer vertical and 90* to
forfloats (as I assume it must be).
I stopped resting all the weight on the struts and floats at this point
thefear of tweaking the attach points on both plane and floats.
The diagonal struts hold the aircraft from tilting back but I can't mount
itdiagonal struts now because I don't know what my of attack is yet! Or does
MAM'smatter? At what point does one rest the aircraft on the floats? Before or
after the diagonals are installed?
Last, I here 2.6* is the right angle to mount the wings to the floats.
placedmanual calls out for a 5/32" gap between the fuselage and level when
allalong the cabin bottom. But I have more like 1-5/32". not sure what that's
*-------------------------------------------------------------------------*about. All the struts are made to the manuals correct lengths and specs.
I can measure the angle anyway when I figure out how and when to rest the
plane on the float struts and measure it.
Bruce 357R
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