[PSUBS-MAILIST] vertical thruster orientation

[Cliff Redus via Personal_Submersibles]

I only saw them on deep dives where the bottom was more silty.  Shallow dives had sandy bottoms.

Sent from my iPhone

> On Aug 11, 2018, at 12:44 PM, David Colombo via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> 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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