[PSUBS-MAILIST] Fwd: Minkota 101

[David Colombo via Personal_Submersibles]

Hi Cliff, all good points. I may have to change my order for my two rear
thrusters as I have the ability to make them bigger as they are not in a
thruster tube. And an extra 24 lbs of thrust wouldn't hurt either. The
question is how will the SeaQuestor handle 426lbs of thrust in acrobat mode?
David

On Fri, Aug 31, 2018, 6:11 AM Cliff Redus via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> David, I think this Minni Kota 101 to 112 migration is a good thing for
> those of us that use the MK troweling motors as low cost thrusters. The
> main reason is the base line thrust increased by 11% because of more
> power. My boat is already set up to handle 60 amps per motor so this
> increase current is not an issue.  I can use the same ducted nozzle I am
> using now but will have to redesign the supports.  Because the body is a
> large diameter (4.5" OD vs 4" OD), this means that the aftermarket prop
> makers like Kipawa have already come out with a 3 bladed prop (Kipawa
> 112).  Because the motor diameter is larger, their 3- bladed prop
> diameter is larger. This means I can take this cheap $35 prop and turn it
> down to fit in my existing nozzle.  This solves one of my problems which is
> having an inexpensive blade that is wide at the tip to minimize pressure
> leakage from the high pressure side to the low pressure side cause by
> putting an open water prop in a ducted nozzle.  This should boost the
> performance of this cheap prop both from being a better match with the
> nozzle and the 11% baseline improvement in power of the motor. As to seals,
> I am not sure what changes they have made (MK 101 have two lip seals) but
> since we pressure compensate these motors, the load on the seals in low
> anyway.  All in all, I think this good new for psubbers that use the MK
> lower units as thrusters.  I can see another R-300 project in the works
> which would be to upgrade to these lower units and repeat the bollard
> thrust test to see how they perform.
>
> Cliff
>
> On Fri, Aug 31, 2018 at 12:31 AM David Colombo via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>>
>> Hi Guys, I just contacted my guy to purchase my last 4 Minnkota 101
>> trusters. For those that may be considering the 101 series, it will be soon
>> replaced with the 112 series. According to my guy, who services electric
>> motors, says he will be now having more business as the new series has
>> substantially weaker seals and that the new motor is also larger in
>> diameter and needs 60A breakers. Not good news for us submariners.
>>
>> On another note the SeaQuestor Hull is progressing. Next week we fit the
>> forward pilot sail, aft hp air tank rack, thruster rack, along with the bow
>> camera mount, t-rings, and hull support rails. next week is going to be
>> exciting.
>>
>> Best Regards,
>> David Colombo
>>
>> 804 College Ave
>> Santa Rosa, CA. 95404
>> (707) 536-1424
>> www.SeaQuestor.com
>>
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