[chbot] Building a Sea Pearch ROV

[Richard Jones]

Traditional yachts use a stern gland to seal the prop shaft. Here is a
diagram: http://www.sea-dreamer.com/subject_page.asp?subject=Stern%20Gland&pagename=2
I have a tub of waterproof grease that I use to seal the stern gland
and I could let you have a little blob. But I suspect vaseline will be
about as good and more friendly to youngsters.

Richard

On Sat, Oct 1, 2011 at 11:51 AM, Kay edgecumbe <kayedgecumbe at hotmail.com> wrote:
> one of the tricks i use for air pump on my sub was to use the servo arm to
> start the pump and at the same time the back of the servo arm released the
> kink in the air hose so that the air trapped in the rise fall ballast only
> flowed if the motor pump was activated ---very reliable
>
>> Date: Fri, 30 Sep 2011 17:03:02 -0500
>> From: kerry at manukadesign.co.nz
>> To: chchrobotics at lists.linuxnut.co.nz
>> Subject: Re: [chbot] Building a Sea Pearch ROV
>>
>>
>>
>> Quoting Mark Beckett <m.beckett at amuri.net>:
>>
>> > Looks like a great idea.
>> > Hadn't thought of sealing a motor in wax.
>> >
>> > Do you have access to Cat 5 patch cable (its more flexible than
>> > ordinary single strand)?
>> > I'm picking a couple of 20m lengths should be enough.
>> >
>> >
>> > Mark
>> >
>>
>> Yeah using wax just seems too simple. I would be interested in finding
>> out what sort of depth you could get these down to before you get
>> water leakage. In older designs they used a layer of vaseline at the
>> shaft end of the motor then an epoxy to seal the rest.
>>
>> I work for Molten Media so lengths of patch cable are no problem. Yeah
>> I was assuming two cables the first one for controlling the 3 motors
>> and the other plus the two extra strands from the first for any other
>> things like cameras, light, etc.
>>
>> What got me onto this project in the first place was talking with Mark
>> Atherton about building an electric fishing torpedo - like this:
>> http://fishingtorpedo.co.nz/company.html without spending the better
>> part of $1200 to $1400, and I was having some trouble getting my head
>> around sealing the prop, he lent me a book on diy rov's which included
>> the Sea Pearch which seemed like a great testbed for larger rov's or a
>> fishing torpedo.
>>
>> Kerry
>>
>>
>>
>>
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