[PSUBS-MAILIST] Lurker finally surfacing!

Mon Aug 27 23:45:04 EDT 2018

Jim,
with regard to your bearings; I am using deep grove ball bearings to take
the axial thrust from the propeller. I was told the thrust bearings require more
precise tolerances & the deep grove ball bearings would be fine.
You mentioned you were using a 10hp motor; the link below is a 11.5hp motor &
it is developing 254lb thrust https://www.max-power.com/product/18-electric-tunnel-thrusters/5115-electric-tunnel-thruster-ct-125
So choose a deep grove ball bearing that is rated for a 250lb axial load.
If they don't state the axial load when you look at the bearing description it is 
generally a certain percentage of it's maximum radial load (forgotten).
Cheers Alan

> On 28/08/2018, at 2:11 PM, james hughes via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Hi Jon,
> Thank you for your advice!  I've not looked at the motor pod drawings of the K250 in more than a decade because when I first started out I bought two 40# thrust motors from the Kent Corporation and figured I would just use those.  Looking at the drawings now I can't seem to see the details I think I would need build (or tell my nephew how to build) such a part.  It's not clear to me what kind of seal to use (many other parts Captain K. was spacific about, like o-rings and valves) or the size.
> Thank you for your recomendation for All Seals Inc.  I bookmarked their website some weeks ago and intend on paying them a visit next week (I've got to wait until I get paid on Saturday).  Fortunately, I live only a few miles from their Lake Forest location. I think I've seen a seal that will work for me in their catalog and a calculation that shows how much room I need (after compressing the spring) to firmly hold the seal in place inside the through hull connection.  Now I need some education in bearings.  There is another site that I may contact about those if no one on this list has a recommendation for me.  Thanks again!
> God bless, Jim
> On Monday, August 27, 2018, 9:49:40 AM PDT, Jon Wallace via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> 
> Welcome Jim.  If I'm understanding your need correctly, won't the K-250 motor pod drawings work for you since they employ a mechanical seal.  Obviously the dimensions would have to be bumped up but the engineering should work. 
> 
> All Seals Inc (allsealsinc.com) is a potential resource for seals. 
> 
> Jon
> 
> 
> From: james hughes via Personal_Submersibles <personal_submersibles at psubs.org>
> To: personal_submersibles at psubs.org 
> Sent: Monday, August 27, 2018 12:13 AM
> Subject: [PSUBS-MAILIST] Lurker finally surfacing!
> 
> Good evening All,
> My name is Jim and I’ve been a lurker on this list for many years now.  Long before now I’ve intended on making my presents known to the whole group (I’ve contacted several members off list over the years) but have always seemed too busy to do so… Well, now I’ve pretty much got all the time in the world and am using much of it to finish building my sub…
> Here’s a little about me: I’m 56.  Retired navy Chief (I was a corpsman).  Just finished earning a BS in marine biology thanks to the GI bill.  Now I’m finally finishing the behemoth that’s been sitting in my brother’s backyard for nearly 15 years now…
> My boat started as a modified K250 (for which I have blueprints) but morphed into something of a money pit since the day I saw and bought a “real bargain” (a giant pressure vessel) at a wrecking yard.  The pressure vessel that I’m using for my hull is 12.5’ long, 5’ in diameter and 5/8” thick.  It would have cost about $15K new, but I got it for $300!  My boat will be named “Pipedream” when it’s done because my original idea called for the hull section being made from a piece of pipe.  I don’t plan on going deeper than 100 feet and will likely stay above 60 feet most of the time.
> One of the reasons I’ve finally surfaced on this list is to ask for help.  Does anyone have a working plan / blueprint of a through hull connection for a drive shaft?  Or can someone direct me to one?  I’ve got a 10 horsepower motor for propulsion that I plan on using to turn a 1 inch diameter, 5 foot long shaft with a 12” propeller.  I’ve read all I can find about mechanical seals and watched all the youtube videos on them that I could find…. Can anyone recommend specific mechanical seals and bearings (manufacturer / source or catalog number)?  My nephew in Texas works at a machine shop and assured me that with the equipment he has, that he can make anything I ask for if I can only get him a basic blueprint or plans for a part with the seals and bearings that I need inside.  I need to wrap up the issue with the through hull ASAP as the guy who has done most of my welding is moving next month and I don’t want to get someone new to put that part in (the welder I have is VERY good at what he does).  I would be very grateful if someone could help me with this particular issue.  Thanks in advance for any advice or help!
> God bless, Jim
> 
> 
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