Unspoken assumptions, like no long runways. Seaplanes have
both "real" and rules-derived problems. Historically, many
seaplanes required headwinds for takeoff with a full load,
which I didn't want for a TL10 design. And the rules have
problems with water speed calculations augmented by wings
for lift. The rules for planing compare water thrust with
loaded weight, without loopholes for this special case.
IIRC, RL Seaplanes may also be designed to take advantage of the wing in
ground effect, greatly increasing lift (up to 40%) if the plane is within
1x-1.5x its wingspan of the ground...
http://en.wikipedia.org/wiki/Ground_effect_in_aircraft
-
Eric Funk
"Knowledge Brings Fear" -- Motto of Mars University, Futurama
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