[PSUBS-MAILIST] "Torpedo"-build

[Alan via Personal_Submersibles]

Lasse,
thinking more about this; the air drill would probably be the equivalent
of about 500W, so maybe 30 minutes run time. You could place a solenoid
valve after the first stage regulator, then you could turn the air on & off through
your RC. Most solenoid valves are 12 or 24V & the RC recievers only put out 5V, 
so I am thinking you could run the solenoid valve off a 12V brushed
speed controller.
As Alec intimated; this has the potential to be a cheap torpedo. A local N.Z. man
made World news & was watched by the authorities, for showing people how
to make an exorcet missile for under $5000-.
Maybe make it look like a boat!
I wonder if there are any cheap pneumatic  tools that are non corrosive that could
be adapted for other functions on the submarine!
Alan

Sent from my iPad

> On 13/09/2016, at 7:34 am, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Lasse,
> you will need to have an arial above water for the RC.
> Is this going to be manned? If it is, maybe you could circulate
> the exhaust & use it to breath from. 
> I would try & calculate how long your motor would run for &
> compare that with an electric motor & batteries.
> On one dive forum they estimated that it would take 3000W of energy for
> 7 minutes to fill a 12L tank to 230 bar. So the very maximum you would 
> get out of one tank is the equivalent of running a 1500 W motor ( Minnkota 101)
> for 14 minutes.
> Alan
> 
> 
> Sent from my iPad
> 
>> On 13/09/2016, at 7:09 am, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>> 
>>   Lasse,
>>                 I was thinking it would be fun to build a probe similar to what you have in mind.  Could be used to gather various data.
>>  
>> Brian
>> 
>> --- personal_submersibles at psubs.org wrote:
>> 
>> From: Lasse Schmidt Westrén via Personal_Submersibles <personal_submersibles at psubs.org>
>> To: Alan James via Personal_Submersibles <personal_submersibles at psubs.org>
>> Subject: Re: [PSUBS-MAILIST] "Torpedo"-build
>> Date: Mon, 12 Sep 2016 17:33:04 +0200
>> 
>> Thank you Hank,
>> 
>> A lot of useful info, we have not been thinking about the exhaust air so we will implement that Into the design. Thank you!
>> Any other thoughts are welcome!
>> 
>> Cheers Lasse
>> 
>> 
>> Den 12 sep. 2016 2:14 em skrev "hank pronk via Personal_Submersibles" <personal_submersibles at psubs.org>:
>> Lasse,
>> I have experimented with air drills as thrusters on a log salvage ROV and it worked well, as long as you add an exhaust pipe to the drill.  The exhaust air must be carried away from the propeller.  This works but the drill will not last long, it is the gear box that fails.  I would suggest a smaller prop and go with a die grinder or any air tool with no gear head.  The vane motor will last a long time.
>> Hank
>> 
>> 
>> On Monday, September 12, 2016 5:45 AM, Lasse Schmidt Westrén via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>> 
>> 
>> Hey guys,
>> 
>> My crew friends at submarine Malen are planning to build a torpedo-ish machine to fool around with in the evenings. 
>> We are thinking of taking a scuba-tank, connecting a simple motor from an air drill and connecting a propeller to it. We are planning to use RC for steering and heading hold via a gyro. 
>> Have anyone tried and have input on this?
>> 
>> Cheers, Lasse
>> 
>> 
>> 
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