The Murphy Builders Site

-----Original Message-----
From: mike.davis@dcsol.com
[mailto:mike.davis@dcsol.com]On Behalf Of
N.Smith
Sent: Tuesday, August 10, 2004 1:26 AM
To: rebel-builders@dcsol.com
Subject: Time to Takeoff for float planes


Hi All

I've just uploaded an excel spreadsheet produced from
an article in SPA's
Water Flying July/Aug 2004 by Paul Armstrong which is
based around a formula
from EDO and Leon Kaplan.

Simply enter engine HP, total float buoyancy, wing
area, MTOW, and prop type
in the blue area's and it comes up with a time on the water.

I've had to upload it to Elite/float installations as
I cannot get it to go
into the software section (Mike...could you sort this
for me when you get a
chance please ?)

Comments please only about the accuracy of the
equation - NOT about my
skills with Excel :-)

Thanks

Nigel
Elite 745E




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-----Original Message-----
From: mike.davis@dcsol.com
[mailto:mike.davis@dcsol.com]On Behalf Of
Legeorgen@aol.com
Sent: Tuesday, August 10, 2004 4:25 PM
To: rebel-builders@dcsol.com
Subject: Re: Time to Takeoff for float planes


I saw this article in SPA magazine for float take off
times too and plugged
in my own numbers (same as yours Walter) for gross
weight and It showed a take
off time of 26 seconds, if I remember right.

I have not seen the formula Nigel posted but I would
guess you either
miscalculated or the formula was not copied correctly.

I believe it was intended for a rough estimate as it
did not take into
consideration the pitch of the prop if it was a fixed
pitch blade. But they did say
it was accurate with most aircraft.

Bruce