[PSUBS-MAILIST] Brushless Thrusters
hank pronk via Personal_Submersibles
personal_submersibles at psubs.org
Sun Sep 7 16:50:37 EDT 2014
Brian,
Vance would know better than me, but I think if you keep the rpm under 1,000 you can use an o ring for a seal. I thought Perry did that in the early subs to 1,000 feet.
Hank--------------------------------------------
On Sun, 9/7/14, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
Subject: Re: [PSUBS-MAILIST] Brushless Thrusters
To: "Personal Submersibles General Discussion" <personal_submersibles at psubs.org>
Received: Sunday, September 7, 2014, 4:42 PM
Brian,
You can use a simple
mechanical seal, that is what the K subs have. An 891
Chesterton mechanical seal is good fo 600 psi, that is what
Gamma had when I got it. You can buy them on ebay for 100
bucks. Build the shaft to fit the seal, and your
sailing.
Hank--------------------------------------------
On Sun, 9/7/14, Brian Cox via
Personal_Submersibles <personal_submersibles at psubs.org>
wrote:
Subject: Re:
[PSUBS-MAILIST] Brushless Thrusters
To:
"Personal Submersibles General Discussion" <personal_submersibles at psubs.org>
Received: Sunday, September 7, 2014, 4:29
PM
I
talked to a hydraulics guy a few days ago about making a
seal for my motor pod. I told him I had a
high pressure
tank that I wanted to turn a
shaft inside the tank to stir
the contents
at 250 psi, ( didn't want his eyes to
glaze over if I mentioned submarine !) Anyway he
directed
me to a system using a bronze
fitting that would tighten
down these rings
he called "cheverons" they are
mating rings of a very high durometer . the bronze is
for
mating with stainless . I would have
to machine an
assembly for this , but once
I have my shaft size (1 inch
most likely) I
will be able to size everything
accordingly. Brian
---
personal_submersibles at psubs.org
wrote:
From: hank pronk
via Personal_Submersibles
<personal_submersibles at psubs.org>
To:
personal_submersibles at psubs.org
Subject: Re:
[PSUBS-MAILIST]
Brushless Thrusters
Date:
Sun, 7 Sep 2014 07:07:20 -0700
Alan
When I upgraded the
cartridge seal in Gamma, I needed a pretty
Beafy thrust
bearing, it was no problem to
get. have since changer to
Magnetic. I think you could replace the bushing
in a
thruster with a ball bearing and never
look back.
Hank
From:
Alan via Personal_Submersibles
<personal_submersibles at psubs.org>;
To:
Personal Submersibles General
Discussion <personal_submersibles at psubs.org>;
Subject:
Re: [PSUBS-MAILIST] Brushless
Thrusters
Sent:
Sun, Sep 7, 2014 1:43:49 PM
Hi Hank,the kort
nozzle on the Indonesian thruster looks a bit
Naff. ( I am designing an art work
here.)I could get a price for the unit
without
kort nozzle, butI'm wondering
if I could
build something for 1/2 that
price.There are some
reasonably priced
brushless motors about.I
don't know
that I could just retro fit a thrust bearing
inside the can of the motor.I tried to put
a
thrust bearing for reverse inside my
brushed thrusters,
butcouldn't find one
with a thin enough
section to fit.Also the
motors are a bit
expensive to just buy
& hope you can fit
one.How did you fit
the thrust bearing on Gamma?
Did the
propellor shaft extend out the backof
the
motor?Alan
Sent from my
iPad
On 7/09/2014, at 7:22 pm, hank pronk
via
Personal_Submersibles <personal_submersibles at psubs.org>
wrote:
Allan
Dont
worry about
thrust bearings to much. They are aesy to get,
I bought one for Gamma , real heavy duty for
80 dollars.
Personally I would just use a
good quality bearing and
replace it once a
year for 8 bucks, if it is a small
thruster. Are you not happy with the
Indonesia thrusters?
Or to pricey?
Hank
From:
Alan via
Personal_Submersibles
<personal_submersibles at psubs.org>;
To:
Personal Submersibles
General
Discussion <personal_submersibles at psubs.org>;
Subject:
[PSUBS-MAILIST] Brushless
Thrusters
Sent:
Sun, Sep 7, 2014 11:58:56 AM
Hi people,
I've
spent several hours today looking at brushless
thrusters
& wonder if anyone else has
looked at them or got any
ideas. There is
the Indonesian thruster I posted a few weeks
back at US 2,200. There is also the Haswing
Protruar 2hp
that Emile has; however they
state that it's for fresh
water only,
& I think Emile said it was a bit noisy.
The inrunner motors that have the winding
on
the outside, seem a good option as they
cool through
convection to the can. They
also need higher revs for torque
&
require a planetary gear box or similar. ( which a lot
have built in)
I was
looking at the
option of making my own
thruster, however the motor would
require a
thrust bearing & I don't
know of
any that would have one other than
maybe
a high powered battery operated drill.
Any
thoughts, suggestions thanks.
Alan
Sent from
my
iPad
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