[PSUBS-MAILIST] vertical thruster orientation

[Cliff Redus via Personal_Submersibles]

I tend to agree with Alec's assessment of vertical thrusters.  Having said
that, I have tried it both ways, slightly positive and slightly negative
and response feels about the same for my boat which has the vertical
thrusters pointing up.  In Lake Tahoe dives, we used slightly negative
approach and did see some bottom conditions particularly for the deep dives
when the thrusters kicked up the bottom silt.  for sandy bottoms, it did
not make much difference.

Cliff

On Thu, Aug 9, 2018 at 9:23 PM, Alec Smyth via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Hi Jon,
>
> There is indeed much less thrust in reverse, plus my latest props that are
> supposedly more efficient also make a bothersome noise when reversed. I'd
> hate to run the thrusters in reverse the whole time during a dive. I orient
> them so they push the sub down, and dive slightly buoyant. That has two
> advantages. The prop wash is directed away from the bottom, so you don't
> ruin visibility. And if something malfunctions, the sub surfaces as a
> fail-safe.
>
> Best,
> Alec
>
> On Thu, Aug 9, 2018 at 8:35 PM Jon Wallace via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>>
>> For those of you using fixed thrusters for vertical diving and ascent, I
>> am curious if you orient the normally "forward" thrust to propel your
>> vessel upwards or downwards.  My assumption is that there is less thrust
>> produced in the "reverse" direction of a minn-kota than the "forward"
>> direction.  I have been thinking that I probably want to orient my motors
>> to produce maximum thrust for surfacing rather than diving, but not sure it
>> matters.  Opinions?
>>
>> Jon
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>
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