[PSUBS-MAILIST] Vertical thrusters

[Alec Smyth via Personal_Submersibles]

Hi Dave,

Looking good! Surely there is a 11" diameter hole coming in the bottom of
that tunnel? You wouldn't want to draw water in horizontally and expel it
vertically - you'd want it to come in directly from the bottom and go out
the top. And once you had that hole, the thruster maybe could also go a
little lower, so that the prop was just below grade on the top skin. But
the latter suggestion seems to me much less important than the first.

Best,
Alec

On Sat, Jul 4, 2020 at 1:47 PM David Colombo via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Ok guys, looking for comments on potential issues with vertical thrusters.
> This morning I laid in the first vert thruster in the wing to mock up the
> attaching bracket to the hull. The twelve inch hole will go thru the wing.
> The questions are:
> 1) hold the prop flush with top surface or raised  slightly. I will be
> fabbing a grill cover.
> 2) as the prop can draw water from the bottom as well as thru the thruster
> tube, any concerns with prop wash being pushed out more laterally vs
> vertically. Wondering if i need to have a collar at least as deep as the
> prop?
>  You might be also wondering why I have 101 lb vertical thrusters. Never
> know when you might need to do a barrel roll maneuver.
> I appreciate the feedback
> David
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