[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
RE: [PSUBS-MAILIST] Side Thruster Options
It will not work as over pressure vale..
vbr Carsten
"Brent Hartwig" <brenthartwig@hotmail.com> schrieb:
>
>
>
> Hello Alec,
>
> Your reminded me of one reason I didn't wish to go with air compensated thrusters. It was a slow bleed into the interior of a K-250 that George was running, that made the hatch dome pop out when he started to ascend, and he was lucky to of survived. This is also why I plan to install a over pressure valve much like the larger one that is installed on the KSS. Except I'll be mounting mine in the bottom of the sub so it can also be used to drain the sub after a wet exit training exercise.
>
>
>
> Regards,
> Szybowski
>
>
>
>
> Subject: RE: [PSUBS-MAILIST] Side Thruster Options
> Date: Fri, 12 Jun 2009 09:14:20 -0400
> From: Alec.Smyth@compuware.com
> To: personal_submersibles@psubs.org
>
>
>
>
>
>
>
>
>
>
>
>
>
>
> Hi Dan,
>
> I recall a past thread in the past on this topic, it
> must be in the archives. Mine were air compensated when I bought Snoopy but
> I switched to oil because the way the air compensation was originally
> implemented, a little air bled into the cabin raising the interior
> pressure. So I've run the same exact motors in both air and oil. I cannot
> tell the slightest difference. They seem to have exactly the same power, and
> even make exactly the same sound. In retrospect, I wish I'd measured the current
> draw so I could compare that, but I'm afraid it's too late. Either method works
> just fine.
>
>
> thanks,
>
> Alec
>
>
>
>
>
>
>
> The contents of this e-mail are intended for the named addressee only. It contains information that may be confidential. Unless you are the named addressee or an authorized designee, you may not copy or use it, or disclose it to anyone else. If you received it in error please notify us immediately and then destroy it.
>
>
> From: owner-personal_submersibles@psubs.org
> [mailto:owner-personal_submersibles@psubs.org] On Behalf Of Dan
> H.
> Sent: Friday, June 12, 2009 8:08 AM
> To:
> personal_submersibles@psubs.org
> Subject: Re: [PSUBS-MAILIST] Side
> Thruster Options
>
>
>
> If I were to do it again I would also go with a Minkota
> or similar for me thrusters. I built mine from standard DC
> motors. They're ambient pressure inside and have ceramic shaft
> seals. It was a lot to go through and not cheep when all was done.
> The worse is the weight of them.
>
> Speed controllers aren't really necessary on fractional
> horse powered thrusters like side thrusters because of the mass of the
> sub. It doesn't react fast. Just pulsing them on and off is
> sufficient. Where I do recommend a speed controller is on the rear
> thruster so you can slowly cruse, skimming the bottom.
>
> Has anyone done any experimenting with oil filling
> thrusters to determine if there is an increase in electrical current draw or
> reduction in thrust do to the drag of the swirling oil and maybe some floating
> of the brushes?
>
> Dan H.
>
>
>
>
> ----- Original Message -----
> From:
> glen
> brown
> To: personal_submersibles@psubs.org
>
> Sent: Friday, June 12, 2009 5:05 AM
> Subject: Re: [PSUBS-MAILIST] Side
> Thruster Options
>
>
> Hi Brent
> I am also planning on using Min Kota 's on my K350 I am
> also thinking of splitting my front mbt for better view of my hydraulic
> manipulator you got any thoughts.
> All the best
> glen south Africa
>
> ----- Original Message -----
> From:
> Brent Hartwig
> To: PSUBSorg
> Sent: Friday, June 12, 2009 12:23
> AM
> Subject: [PSUBS-MAILIST] Side Thruster
> Options
>
>
>
> Greetings James,
>
> I'm also planning
> on installing small mostly off the shelf thrusters on the sides of my K boat
> to reduce drag and simplify things. I've been planning on using 36
> volt Minn Kota 101 saltwater thrusters, like Frank, and I believe Vance are
> using and oil compensate them. Last I checked those thruster were
> running $250 each with the speed controllers going for $150
> each.
>
> I'll have to check my notes, but I believe Karl Stanley
> is using 6 of the 36 volt Minn Kota saltwater thruster that he has oil
> compensated, and has used down to 2500 fsw. Two for vertical thrust
> and four in the stern. Are you expecting to go that deep James. ;}
>
> I
> like the idea of using the existing flexible shafts on some motors that Alec
> mentioned. I expected that I would clamp mine on in a similar manor as Frank
> has done, since I'm not sure of the long term saltwater durability of my
> favorite brand of duck tape.
>
> I see the need to beef up the side thru
> hulls, and was planning on looking closely at how Dan beefed his up. With
> the new tangle guard configuration I'm planning, I don't expect the
> thrusters will sustain any real damage unless the Euronaut or the like plays
> to rough with my sub.
>
> Regards,
> Szybowski
>
>
>
>
> > Subject: RE:
> [PSUBS-MAILIST] Subdate
> > Date: Thu, 11 Jun 2009 17:46:21
> -0400
> > From: Alec.Smyth@compuware.com
> > To:
> personal_submersibles@psubs.org
> >
> > Hi James,
> >
> >
> 1. Do people just buy the standard Minn Kota outboard motor complete
> >
> with the bracket, leg, controls, handle, battery etc and just modify
> the
> > motor part? or can you get just the motor and prop on its
> own?
> >
> > AS: You can buy just the parts you need cheaper than
> the whole thing, I
> > recommend www.trollingmotorparts.com.
> >
>
> >
> > 2. Whats the through hull design? A straight forward twin
> O ring
> > through hull on the outboard shaft?
> >
> > AS: I
> would not go with the standard pipe because it just isn't strong.
> > In
> fact some motors come with plastic pipes designed to be flexible so
> >
> the shaft bends when you hit something, rather than break off. On
> the
> > side thrusters, I've got heavy through-hulls. I did use the
> stock pipe
> > on the stern thruster, because that one doesn't go
> through the hull. The
> > through-hulls are just a SS bar stock with an
> external shoulder to
> > prevent the thing from being pushed in, and
> bored to whatever minimum
> > inside diameter you need for the cables
> and potting. Do not just pot the
> > cables, you have to put in solid
> conductors so the pressure doesn't wick
> > along the cable strands. I'd
> recommend machining some vice flats on the
> > through-hull too, for the
> day you need to unscrew a thruster that's been
> > on there a few years.
>
> >
> >
> > 3. Compensation. Oil, ambient air pressure
> regulator?
> > I've had both but like oil compensation the best because
> it's the
> > simplest (not a single moving part). I just changed the oil
> a couple of
> > days ago. I expected it to be laden with carbon
> deposits, but it came
> > out looking like new despite being in there
> for 4 years. Admittedly I
> > put very few hours on the sub, but it
> still surprised me that the oil
> > came out looking as clear as the day
> it went in. And yes, it WAS oil not
> > water that came out...
> >
>
> > :)
> >
> > Alec
>
>
>
>
>
>
>
>
> No virus found in this incoming message.
> Checked by AVG -
> www.avg.com
> Version: 8.0.339 / Virus Database: 270.12.63/2169 - Release
> Date: 06/11/09 05:53:00
>
>
>
************************************************************************
************************************************************************
************************************************************************
The personal submersibles mailing list complies with the US Federal
CAN-SPAM Act of 2003. Your email address appears in our database
because either you, or someone you know, requested you receive messages
from our organization.
If you want to be removed from this mailing list simply click on the
link below or send a blank email message to:
removeme-personal_submersibles@psubs.org
Removal of your email address from this mailing list occurs by an
automated process and should be complete within five minutes of
our server receiving your request.
PSUBS.ORG
PO Box 53
Weare, NH 03281
603-529-1100
************************************************************************
************************************************************************
************************************************************************