[PSUBS-MAILIST] "Torpedo"-build

Mon Sep 12 19:28:42 EDT 2016

The air motor is a air demanding beast, it worked on my Log salvage ROV because the entire thing was air powered and had a surface supply line.Hank 

    On Monday, September 12, 2016 5:02 PM, Stephen Fordyce via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Hi Lasse,
I made a rig to run a cheap air drill off a SCUBA tank a while ago. It worked, but used a frightening amount of air on the surface, and increasing amounts at depth (ie. Theoretically twice as much at 10m). While drilling a couple of sample holes in steel, the 12L (80c.f.) SCUBA tank lasted about 5 min!A quick Google indicates maybe I was doing something wrong (or asking too much of it) and that typical flow rates of 5cfm would give run time of 16min.I would compare that to a diver propulsion vehicle (DPV)/"scooter" - I recently did a 7km/4hr cave dive with one of these.  With a custom lithium ion battery I designed, it weighed the same amount as a SCUBA tank. With lead acid batteries it's probably still good for more than twice the SCUBA tank.Cheers,
Steve
On 13 Sep 2016 7:48 am, "JimToddPsub via Personal_Submersibles" <personal_submersibles at psubs.org> wrote:

Using a battery powered drill motor might be more prudent and referring to it as an ROV.  Sure it changes the design somewhat, but an air trail on the surface might scare the heck out of people.  Where would you be testing it and at what depth?Jim

Sent from my iPhone
On Sep 12, 2016, at 1:25 PM, Alec Smyth via Personal_Submersibles <personal_submersibles at psubs. org> wrote:

Hi Lasse,
You're very well regarded here, we all know you and have for a long time. But may I suggest that in today's world someone who did not know you and came across such a project (for instance a Youtube video of it) might not react the same way? There are people whose full time job is spotting security threats, and what is really a completely innocent initiative might cause them concern. They can be expected to err on the side of caution with regulations or prohibitions of some sort. In short, I would suggest for the sake of everyone, this idea although fun is probably not advisable given the current state of affairs. It pains me to say so, because I used to build canons and bombs for fun when I was a 12 year old, but times have changed. 

Cheers,
Alec 
On Mon, Sep 12, 2016 at 7:44 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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