[PSUBS-MAILIST] vertical thruster orientation

[David Colombo via Personal_Submersibles]

Cliff. I never noticed any sediment plooms while entangled on the bottom,
but maybe I was distracted.
David

On Sat, Aug 11, 2018, 9:45 AM Cliff Redus via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> 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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