Today's Message Index:
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1. 09:16 AM - float rigging (Peter C)
2. 11:29 AM - Re: float rigging (Noel Loveys)
Message 1
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Is anyone aware of any significant document that goes into detail on the
various aspects of hanging floats on an aircraft?
I've heard the assorted rules of thumb about step placement and angle
and have successfully mounted floats before but I'm curious about what
is behind some of the ideas and the affects of deviating from them.
For example one formula says mount the step 1/4 (or 1/3) of the WIDTH of
the float behind the cg. Where does this come from? How does float width
affect this?
Another says mount the step so as to intersect a line drawn 6 degrees
aft of the cg. This imples that height of the rigging affects step
placement.
What are the factors affecting height above the floats?
Why is loading never mentioned? In other words wouldn't the step
position be of more interest to the cg at gross than empty cg?
Surely there is a reference book on this somewhere. I was not successful
with google searches.
Thanks
Peter
Message 2
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the recipe I use for locating the installation point for floats is:
*Obtain one float
*Obtain a small body of water .
*Put the float in the body of water.
*Start filling the front compartment of the float and continue until the
float floats level.
*Remove the float from the body of water.
Now it gets tricky
*Obtain a stick about two feet long and 4'-10' in diameter ( about the
size
of a nice stove billet )
*Rest the float on the stick so the stick supports the keel of the
float
and roll it ahead until the float is balanced.
*Measure the distance back from the front of the float the stick is.
*drain the water out of the float.
*Mount the floats so the CG of the plane is the same distance back from
the
front of the floats as the measurement tow steps ago.
Install the float so the AOA of the plane is about 1-3deg up.
No mixing required
No oven stove or refrigerator
Also no ballast required to get the plane up on step.
Weakness of recipe:
For planes that are tandem seating the overloading of the back seat will
cause the tails of the floats to sink. For such planes put the CG over
the
balance point of the floats when the plane has a medium load...with the
landing gear removed.
The whole idea is to get the plane to float more or less level at rest
in
the water.
There are some who intentionally float planes like the super cub with
too
much weight forward. These planes require carrying ballast in the back
seat
to enable the plane to get up on step. They also enable the plane to
carry
a whopping big load behind the pilot.
Noel
-----Original Message-----
From: owner-seaplane-list-server@matronics.com
[mailto:owner-seaplane-list-server@matronics.com] On Behalf Of Peter C
Sent: Monday, March 12, 2007 1:46 PM
Subject: Seaplane-List: float rigging
Is anyone aware of any significant document that goes into detail on the
various aspects of hanging floats on an aircraft?
I've heard the assorted rules of thumb about step placement and angle
and
have successfully mounted floats before but I'm curious about what is
behind
some of the ideas and the affects of deviating from them.
For example one formula says mount the step 1/4 (or 1/3) of the WIDTH of
the
float behind the cg. Where does this come from? How does float width
affect
this?
Another says mount the step so as to intersect a line drawn 6 degrees
aft of
the cg. This imples that height of the rigging affects step placement.
What are the factors affecting height above the floats?
Why is loading never mentioned? In other words wouldn't the step
position be
of more interest to the cg at gross than empty cg?
Surely there is a reference book on this somewhere. I was not successful
with google searches.
Thanks
Peter
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