[PSUBS-MAILIST] Commercial question

[Sean T. Stevenson via Personal_Submersibles]

Phil - I'm curious as to what your take is on LiFePO4 batteries. Did you
investigate these before you made the switch?

Sean


On 2014-05-13 19:33, Phil Nuytten via Personal_Submersibles wrote:
> Re: HP per ton -- We are now running the big 'Newt-screws' (unofficial
> name) on both the dual and single DeepWorkers. The single two thousand
> footer comes in at just over two tons and has 20 HP (4 X 5HP combined
> vertical and horizontal) These units can be dialled back to any rating
> up to a max of 5 HP  -if you want to conserve batteries and don't need
> the extra oomph -- we've also switched to LiOH battery packs. 3 times
> the duration at half the weight -- what's not to like??
> Phil
>  
> *From:* Vance Bradley via Personal_Submersibles
> <mailto:personal_submersibles at psubs.org>
> *Sent:* Tuesday, May 20, 2014 5:28 PM
> *To:* Personal Submersibles General Discussion
> <mailto:personal_submersibles at psubs.org>
> *Subject:* Re: [PSUBS-MAILIST] Commercial question
>  
> Which may explain why that big anvil in back kicks such serious ass,
> even with Captain George's dinky prop.
> Vance
>
> Sent from my iPhone
>
> On May 20, 2014, at 8:08 PM, Jon Wallace via Personal_Submersibles
> <personal_submersibles at psubs.org
> <mailto:personal_submersibles at psubs.org>> wrote:
>
>> That puts K-350 at the heavy power end, a strong 2HP per ton if you
>> include the maneuvering motors.
>> Jon
>>
>> On 5/20/2014 8:21 AM, via Personal_Submersibles wrote:
>>> Better a question for Phil, I think. Gamma has 2 hp and weighs 2
>>> tons. PC-12 had a combined 13 hp for 8 tons (10 main plus two
>>> horizontal and one vertical maneuvering thruster). The Pisces boats
>>> used a pair of 5 hp thrusters for 12-12 tons. So it is beginning to
>>> look like about 1 to 1.5 per ton, now that I think about it.
>>> Vance
>>

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