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Float Flyr
Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland
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 Posted: Tue Jun 19, 2007 2:51 pm Post subject: OT..RE: Re: Nose wheel and weight & balance for Classic IV |
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Luis I like the idea of driving the plane up on the scales before every flight... I'm on floats 
Not only that, on wheels my weight would disappear from the plane when I got out to read the scales
Why didn't I think of that???
[img]cid:653054722(at)19062007-344D[/img]
Noel Loveys, RPP, AME intern
Campbellton, Newfoundland,
Canada
Kitfox Mod III-A, 582, B box, Ivo IFA
Aerocet 1100s
noelloveys(at)yahoo.ca (noelloveys(at)yahoo.ca)
Do not archive
[quote] --
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Noel Loveys
Kitfox III-A
Aerocet 1100 Floats |
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smokey_bear_40220(at)yaho
Guest
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| Posted: Wed Jun 20, 2007 8:08 am Post subject: OT..RE: Re: Nose wheel and weight & balance for Classic IV |
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Noel,
You've got it made. Just mark your floats fore and
aft for displacement and balance....use fine
graduations...... our Michel in Norway probably has
the formulas to use.
Need calm waters....
Floats nose down = FWD CG
Floats nose up = AFT CG (-:
Floats under water = over gross 
Kurt Schrader
S-5/NSI turbo
Florida and panama
Just kidding
Do not archive
--- Noel Loveys <noelloveys(at)yahoo.ca> wrote:
| Quote: | Luis I like the idea of driving the plane up on the
scales before every flight... I'm on floats
Not only that, on wheels my weight would disappear
from the plane when I got out to read the scales
Why didn't I think of that???
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| Quote: | Noel Loveys, RPP, AME intern
Campbellton, Newfoundland,
Canada
Kitfox Mod III-A, 582, B box, Ivo IFA
Aerocet 1100s
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Park yourself in front of a world of choices in alternative vehicles. Visit the Yahoo! Auto Green Center.
http://autos.yahoo.com/green_center/
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Float Flyr
Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland
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| Posted: Wed Jun 20, 2007 10:36 am Post subject: OT..RE: Re: Nose wheel and weight & balance for Classic IV |
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It's easier than that...
When I get aboard of the plane if it floats too nose down (never happened) I am nose heavy and if the sterns of the floats dip under then I'm too tail heavy... All I have to do is watch how much I load into the plane. Also the more weight I put in the plane the further back the CG moves so seeing the tails of the floats dip would mean I'm waaay over loaded.
Never the less, I still do my W&B before each flight... Never know when I'll fly another plane... maybe even on wheels or skis.
[img]cid:168373418(at)20062007-0887[/img]
Noel Loveys, RPP, AME intern
Campbellton, Newfoundland,
Canada
Kitfox Mod III-A, 582, B box, Ivo IFA
Aerocet 1100s
noelloveys(at)yahoo.ca (noelloveys(at)yahoo.ca)
Do not archive
[quote] --
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Noel Loveys
Kitfox III-A
Aerocet 1100 Floats |
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Michel
Joined: 10 Jan 2006
Posts: 966
Location: Norway
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| Posted: Wed Jun 20, 2007 12:31 pm Post subject: OT..RE: Re: Nose wheel and weight & balance for Classic IV |
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On Jun 20, 2007, at 6:07 PM, kurt schrader wrote:
| Quote: | ...... our Michel in Norway probably has the formulas to use.
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Er ... I am not sure which formula you are referring to Kurt but ...
here is how it's done for yachts.
You design a hull (float) with a designed waterline i.e. what you wish
to be the waterline when built. From the section drawing and for each
station (traditionally divided in ten stations from bow to stern) you
use a planimeter to measure the surface of each of them under the water
line. Then you multiply it by what is called the Simpson's multiplier,
which is: 1, 4, 2, 4, 2, 4, 2, 4, 2, 4, 1. From that, you get the
function which you multiply by the arm (0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
10) and get the moment.
Just like for the aircraft weight and balance, the sum of the moments
divided by the sum of the functions gives the center of longitudinal
buoyancy in sections from section 0 (there where the bow meets the
water).
If you want then have the seaplane to float on that waterline, you have
to balance your place (including the floats!) so that its center of
gravity is exactly over the center of buoyancy.
Another formula that can be used to calculate the displacement (which
is the actual weight of the plane), is: 2/3 x the sum of the functions
in feet x 16/9 x the station spacing in feet.
That will give you the volume in cubic feet, which when multiplied by
64 (for sea water) will give you the displacement in pounds.
If that calculation doesn't match your calculated weight, the seaplane
won't float on that waterline.
Now, a planimeter, which is an instrument made of articulated arms, a
lead weight and a counter, is not commonly found in not cheap to
purchase. Instead of that, one can divide the stations into small
geometric surfaces such as trapezes and triangles and calculate the
surface of each then add them.
.. and if you want to know why I am using U.S. measures it is because
I learnt yacht design from someone who worked many years with Sparkman
and Stephens in New York!
Cheers,
Michel Verheughe
Norway
Kitfox 3 - Jabiru 2200
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Float Flyr
Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland
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| Posted: Wed Jun 20, 2007 2:10 pm Post subject: OT..RE: Re: Nose wheel and weight & balance for Classic IV |
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Michel:
The frightening part of all that is I think I followed all of it.
When I install floats for the first time I generally take one float and fill the front compartment with water until it floats level. Then I find the CG of it which is also the CB (centre of buoyancy) doing this in February is next to impossible!
[img]cid:826480922(at)20062007-089C[/img]
Noel Loveys, RPP, AME intern
Campbellton, Newfoundland,
Canada
Kitfox Mod III-A, 582, B box, Ivo IFA
Aerocet 1100s
noelloveys(at)yahoo.ca (noelloveys(at)yahoo.ca)
Do not archive
[quote] --
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Noel Loveys
Kitfox III-A
Aerocet 1100 Floats |
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smokey_bear_40220(at)yaho
Guest
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| Posted: Fri Jun 22, 2007 6:26 am Post subject: OT..RE: Re: Nose wheel and weight & balance for Classic IV |
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--- Michel Verheughe <michel(at)online.no> wrote:
| Quote: | On Jun 20, 2007, at 6:07 PM, kurt schrader wrote:
> ...... our Michel in Norway probably has the
formulas to use.
Er ... I am not sure which formula you are referring
to Kurt but ... here is how it's done for yachts.
..........................................
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That is what I meant Michel. And you probably pulled
that out of memory too.
Do not archive
Kurt Schrader
S-5/NSI turbo
Florida and panama
Shape Yahoo! in your own image. Join our Network Research Panel today! http://surveylink.yahoo.com/gmrs/yahoo_panel_invite.asp?a=7
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