[PSUBS-MAILIST] Manipulators

[Alan]

One more question Vance & I'll leave you in peace
for a week.
For a small non commercial submersible operating to 500 ft
that has a very limited use for a manipulator other than it being there 
just in case we come across some item of value. Is a pneumatic manipulator a good
option? Air is already there & wouldn't be consumed much because
of the limited use. No noise & expensive space consuming hydraulic system.
And as you say there are options for lifting heavier items.
Thanks,
Alan

Sent from my iPad

> On 25/01/2014, at 8:01 am, Joe Perkel <josephperkel at yahoo.com> wrote:
> 
> 
> I particularly liked the PVC tube with the furled lift bag and air source, now that's got real "get work done" utility.
> 
> It seems to me that a permanently mounted air source terminating just aft of the claw is a natural companion set-up for anyone with a manipulator on a PSUB. 
> 
> Joe
> 
> Sent from Yahoo Mail for iPad
> 
> From: Alan James <alanlindsayjames at yahoo.com>; 
> To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>; 
> Subject: Re: [PSUBS-MAILIST] Manipulators 
> Sent: Fri, Jan 24, 2014 6:09:42 PM 
> 
> Thanks Vance,
> that's shed some light on the subject.
> Alan
> 
> From: Vance Bradley <Vbra676539 at AOL.com>
> To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
> Sent: Saturday, January 25, 2014 5:42 AM
> Subject: Re: [PSUBS-MAILIST] Manipulators
> 
> Alan,
> I've seen the discussion. The smallest sub I know of with a manipulator on board is the Deepworker. No exfra tanks there. Metacentric vs CG works in all directions. Yes, you get movement and no it's not a problem in my experience. I did operate the bigger subs but also smaller ones, to include Aquarius, briefly in a DW, plus three different K-boats, so speak with some experience. You put everything you imagine on a small sub, you get a big sub. In any case, It's probably best to think of a psub as a work in progress. Get the boat done, go play, scratch head, get more work done, go play, scratch head......and so it goes.
> Vance
> 
> Sent from my iPhone
> 
>> On Jan 24, 2014, at 3:20 AM, Alan James <alanlindsayjames at yahoo.com> wrote:
>> 
>> Vance,
>> a couple of people have mentioned lately the problem of the shifting of
>> balance as you reach out with a manipulator & have talked about countering it with
>> trim tanks. Is it a big deal if you go nose down, tail up? Possibly more of a problem working on a 
>> vertical face than picking something up off the bottom. 
>> Some of our subs will be a lot smaller than the working subs you were in so the problem would be 
>> accentuated in our case.
>> Can you give us some of your experience on this thanks & in your opinion is it worth messing
>> about with the trim while operating the manipulator.
>> Alan
>> 
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