[PSUBS-MAILIST] Diver propulsion vehicle project

Fri Jan 24 02:33:53 EST 2014

The Tahoe benchmark from 2009 tested a couple of scooters with similar prop and shroud as the one I'm using. Bollard pull was around 35-46 lbs with power consumption in the range of 450W-520W. The motor I'm using peaks at around 700W so I think I will get a slightly higher thrust. The report can be read here: http://www.tahoebenchmark.com/pdfs/2009/2009TahoeBenchmarkV2.pdf

- Jon

> Den 23. jan. 2014 kl. 23:07 skrev vbra676539 at aol.com:
> 
> Thanks Jon. It looks to me that this could be a good alternative for the home builder. Any idea of the bollard pull your unit will produce? Even at Norwegian prices, I think you could probably build something like I'm thinking about for a thousand dollars--or 6000 kroner, whichever comes first.
> Vance
> 
> 
> -----Original Message-----
> From: Jon Eide Pettersen <jon at pettersen-prod.com>
> To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
> Sent: Thu, Jan 23, 2014 4:24 pm
> Subject: Re: [PSUBS-MAILIST] Diver propulsion vehicle project
> 
> Vance,
> The motor and controller was 244$ including shipping, duct and shroud was around 200$ including shipping and import fee. Magnets, bearings and sensors were around 100$ in total I think. Batteries will be around 125$, and I spent 80$ on delrin. The tube which is the main body was kindly donated from a business that liked my project, and the aluminium stock I was lucky have left over from a previous project. Keep in mind that Norway is quite expensive so some of the parts are propably cheaper elsewhere. Anyway, I think a total of 750$ sounds right.
> 
> The motor is probably intented for some kind of industrial use, as it is very heavy and thick-walled. Here is a thread from endless-sphere with some pics and testing of the 800w edition: http://endless-sphere.com/forums/viewtopic.php?f=30&t=45443&sid=c3f78cf1221ba9251d90820d229764e1
> 
> - Jon
> 
> 
> Den 23.01.2014 20:10, skrev vbra676539 at aol.com:
>> Jon,
>> Might as well ask. What's your total investment going to be? This looks like a pretty good experimental option for subs, at the very least. I'm with you on the motors. It will be interesting to see just how tough they are.
>> Vance
>> 
>> 
>> -----Original Message-----
>> From: Jon Eide Pettersen <jon at pettersen-prod.com>
>> To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
>> Sent: Thu, Jan 23, 2014 1:24 pm
>> Subject: Re: [PSUBS-MAILIST] Diver propulsion vehicle project
>> 
>> Thanks for the kind words!
>> 
>> The nozzle/shroud has an inside diameter of around 303mm at the narrowest. Both the nozzle and the prop are replacement parts for the commercial DPVs made by dive-xtras. The shroud cost 70.50$, while the propeller kit is 67$. I bought it directly from dive-x here: http://www.dive-xtras.com/cart/pc/viewPrd.asp?idproduct=42&idcategory=7. 
>> 
>> A nice feature with the propeller is that it has variable pitch, and that the blades can be replaced individually. However, the blades are plastic and I'm not sure how well they would survive an impact or entanglement. The scooters from dive-x have a clutch to save the prop in case this happens. Here is a drawing of the propeller assembly used by dive-x: http://www.dive-xtras.com/pages/support/diagrams/linedrawings/propellerassembly.pdf
>> 
>> I bought the motor from www.goldenmotor.com. I'm not impressed by the build quality, but it was very cheap and hopefully it will work. They also have 650w and 800w editions of the same motor, perhaps this would be suitable for use in a submersible? http://www.goldenmotor.com/BLDC%20Motors%20for%20Light%20Weight%20Trikes.jpg
>> 
>> 
>> - Jon
>> 
>> 
>> Den 23.01.2014 16:16, skrev vbra676539 at aol.com:
>>> And barring that, how about a 36 volt 3/4 hp PM motor, housing and drive? It would be sweet to cook something DIY up that could be built by a competent home machinist.
>>> Vance
>>> 
>>> 
>>> -----Original Message-----
>>> From: Alec Smyth <alecsmyth at gmail.com>
>>> To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
>>> Sent: Thu, Jan 23, 2014 9:10 am
>>> Subject: Re: [PSUBS-MAILIST] Diver propulsion vehicle project
>>> 
>>> Hi Jon,
>>> 
>>> Welcome! That is a nicely documented project, and very timely since we recently had threads about kort nozzles and magnetic couplers. Quick question... could you tell me what diameter that nozzle (aka shroud) is and how much it and the prop cost? I'm curious about adapting those to trolling motors.
>>> 
>>> 
>>> Best,
>>> 
>>> Alec
>>> 
>>> 
>>>> On Thu, Jan 23, 2014 at 8:47 AM, Jon Eide Pettersen <jon at pettersen-prod.com> wrote:
>>>> Hi!
>>>> 
>>>> I'm currently designing and building a diver propulsion vehicle with a magnetically coupled drive. I will use a 48v 500w BLDC motor intended for electric trikes, powered by 4 SLA batteries coupled in series.
>>>> 
>>>> I'm posting my progress at my personal website, http://pettersen-prod.com/project/dpv/index.html. 
>>>> 
>>>> Anyway, hope you find this interesting! I hope to build a submersible in the future, but this will suffice until I have the funding and knowledge needed :)
>>>> 
>>>> 
>>>> Regards, 
>>>> Jon Eide Pettersen
>>>> _______________________________________________
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