[PSUBS-MAILIST] Minn Kota 101 - thread spec

Mon Jul 21 11:50:57 EDT 2014

Hi Cliff\Alec\All,

Sorry Cliff, I just banged that email off quick without remembering you are
one of the proper engineers in the group.  Im sure you don't need my boy
scout tips.!  The problem for me is that there seems to be a fair bit of
air stuck, obviously trapped by the protruding nipple.  When I say "a fair
bit", I mean the tube seems to be about half full no matter how much I
swing it around and top it up.  Ive tried various methods to get shot of it
and there always seems to end up this bit.  Hence the little plug idea
which I agree, introduced another potential leak point.  I'll think about
it for now.

Alec, yes I was pleased with how the wheels turned out.  I did it by hand
and there was only one wheel that was a bit wonky!  10 wheels per side.
Cant wait to test it out next weekend!
Regards
James

On 21 July 2014 16:30, Alec Smyth via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Wow, love those wheels, I think they look great and will work even better.
> You didn't skimp on the number of them either!
>
>
> On Mon, Jul 21, 2014 at 8:40 AM, James Frankland via Personal_Submersibles
> <personal_submersibles at psubs.org> wrote:
>
>> Hi Guys,
>> Of course there are different ways of doing it.  I think the problem is
>> in my case that i cant get that last bit of air out which is why im
>> thinking of that vent at the back end, if it will fit there.  I'd also
>> thought of putting a fuel bulb or similar in the line to allow a larger
>> reservoir.  I paid quite a lot for my motors and I really do not want to
>> bust them.  Oh, Alecs mail just dropped in.  Yes, those bellows are similar
>> to the fuel bulb idea.  Ive actually bought several little fuel bulbs as a
>> test.  I think i might rig one up and see how it goes.  Also i cant trim
>> off the inside of the pipe nipples as I made them from stainless.  Could
>> replace them i suppose.  hmm.
>>
>> Anyway, on another subject, have a look at my new wheels, im really
>> pleased with them, although im not sure they look quite as good as the
>> skids.  Only got one side on so cant tell you how they work, but so far so
>> good.
>> Regards
>> James
>>
>>  
>>
>>
>>
>>
>> On 21 July 2014 12:19, via Personal_Submersibles <
>> personal_submersibles at psubs.org> wrote:
>>
>>> The o-ring bucket for the shaft seal and the body seals are not actually
>>> designed for any sort of internal head pressure on the M-Ks. That said,
>>> I've seen some modified to improve the groove shape and tank tested to
>>> failure, which happened at the equivalent of 1200'. This exercise included
>>> a modification to the shaft penetration recess to allow for a ceramic pump
>>> seal installation. I think you will find that Karl S. compensates (with
>>> air) to ambient, and does a lot of diving with little or no trouble. The
>>> simple tube compensator (which serves as its own reservoir, I might add) is
>>> a time honored compromise. Cheap and effective. Snoopy uses them
>>> successfully. Mine work just fine, too.
>>> Vance
>>>
>>>
>>> -----Original Message-----
>>> From: Alan James via Personal_Submersibles <
>>> personal_submersibles at psubs.org>
>>> To: Personal Submersibles General Discussion <
>>> personal_submersibles at psubs.org>
>>> Sent: Mon, Jul 21, 2014 5:59 am
>>> Subject: Re: [PSUBS-MAILIST] Minn Kota 101 - thread spec
>>>
>>>   Hi James,
>>> I could generate some robust discussion here, but I don't think the wrap
>>> around tube is a very good idea.
>>> If you look at professional oil compensation units, they are set at
>>> about 4-5psi above ambient pressure &
>>> have reservoirs to compensate for oil loss & for oil expansion as it
>>> heats up.
>>> From past posts, Emile & Carsten had all soughts of trouble with oil
>>> compensating & Emile changed to
>>> rim thrusters. I have read a previous post where someone quotes a guy
>>> with years of experience modifying minnkota
>>> motors for underwater use, as saying that 3 out of 4 can operate down to
>>> 100ft without any compensation. I think this may be part
>>> of the reason the wrap around tube seems to work. Still, if water gets
>>> in there will be some protection from the oil.
>>> Cheers Alan
>>>
>>>
>>>   ------------------------------
>>>  *From:* James Frankland via Personal_Submersibles <
>>> personal_submersibles at psubs.org>
>>> *To:* Personal Submersibles General Discussion <
>>> personal_submersibles at psubs.org>
>>> *Sent:* Monday, July 21, 2014 9:17 PM
>>> *Subject:* Re: [PSUBS-MAILIST] Minn Kota 101 - thread spec
>>>
>>>   Hi Cliff,,
>>> Others may disagree with this, but ive got a suggestion.  If your oil
>>> compensating the motors and are going to add the wrap around tube\bladder
>>> as per Alecs Snoopy, I would suggest, adding a vent hole somewhere near
>>> the aft bearing.  With my setup, ive put the tube going around the motor
>>> and its all ok.  But, I just cannot get the last dregs of air out.  No
>>> matter what I do.  I suspect that its because the pipe nipple protrudes a
>>> mm or so into the casing and so will not allow the last bit of air out.  It
>>> really irritates me and I worry that the motor is not properly
>>> compensated.  So, I am going to make a modification to the motor like this
>>> pic.  I think this will work, the suspect bit is mating the plug against
>>> the slightly domed motor case.  I think a large rubber washer should seal
>>> it.   The i should be able to rotate the motor and remove the last dregs of
>>> air.  What do you think?
>>> Thanks
>>> James
>>> 
>>>
>>>
>>>
>>>
>>> On 19 July 2014 01:38, Clifford Redus via Personal_Submersibles <
>>> personal_submersibles at psubs.org> wrote:
>>>
>>>
>>>
>>>   Thanks
>>>
>>>
>>> Cliff Redus
>>>
>>> On Jul 18, 2014, at 7:26 PM, Alec Smyth via Personal_Submersibles <
>>> personal_submersibles at psubs.org> wrote:
>>>
>>>  Hi Cliff,
>>>
>>> It is a parallel thread, 1 1/8" - 18.
>>>
>>> Best,
>>>
>>> Alec
>>>
>>>
>>> On Fri, Jul 18, 2014 at 8:04 PM, Cliff Redus via Personal_Submersibles <
>>> personal_submersibles at psubs.org> wrote:
>>>
>>>    Does anyone have any documentation on the Minn Kota 101 main support
>>> female thread spec?  It does not look like a tapered pipe thread and the
>>> threads per inch look to great. I put a digital caliper on this at it read
>>> 1.064-1.07 inches for the minor diameter.  I measured the threads and it is
>>> 18 threads per inch.    I looked in the machine handbook and the closest
>>> that comes is a 1-1/8  UNEF (Extra fine thread series).  The major and
>>> minor diameters for a 1-1/8" UNEF are 1.1250" and 1.0649"  respectively.
>>>
>>> Can anyone confirm this?
>>>
>>> Cliff
>>>
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>>
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