Bubble injection behind the step on seaplanes

Yep! The concept works. The basic idea is at least 100 years old.

Some racing speed boats use this.

JP


"Adam Aulick" kirjoitti
...
I have been reading up on seaplanes (Seaplane Operations, by Cesare Baj and
Dale DeRemer) and one frequently repeated fact is that it is very hard to
get a seaplane up on the step on glassy water, because the lack of bubbles
under the float/hull causes the heel of the float/hull to adhere to the
water surface.

This seems like an easily solved problem -- inject bubbles behind the
step. Clearly if it were that easy it would be common practice. What am
I missing?

Here is my hull profile at the step:

To Heel -- Step -- To Bow
_____________________
O| /
x|______________________/


When moving at speed through the water, it seems that at point O there
should be a circulating eddy or turbulence, and at point x there should be
significant suction, yes? So if we attach at point x a hose, whose one
endpoint is at x and the other is above waterline, without any further
mechanics the low pressure at x should be sucking air through the hose and
introducing a trail of bubbles, slipping past the turbulence at O and
running along the undersurface of the heel. If we put in a bunch of such
hoses, or one long hose running along the back of the step with a bunch of
holes spaced along it, we should get a lot of bubbles. Yes?

What am I missing?

~Adam