Snikwah
August 23, 2014, 12:16:58 PM *
Welcome, Guest. Please login or register.

Login with username, password and session length
News: SMF - Just Installed!
 
   Home   Help Search Login Register  
Pages: 1 [2]
  Print  
Author Topic: hobby king jet unit photos  (Read 6676 times)
bentley marshall
Full Member
***
Posts: 102


View Profile Email
« Reply #15 on: September 07, 2011, 11:13:26 PM »

it has a bronze bush in the rear now so will slot that and put a hole in the back
Logged
Dana W
Jr. Member
**
Posts: 60


View Profile Email
« Reply #16 on: November 10, 2011, 06:43:44 AM »

Have you tested this pump yet Bentley ?

                                       Dana
Logged

DaVette Boats
bentley marshall
Full Member
***
Posts: 102


View Profile Email
« Reply #17 on: November 10, 2011, 11:03:15 AM »

no i havent had a chance yet i still need to get a hull
Logged
LUV2squirt
Full Member
***
Posts: 195



View Profile
« Reply #18 on: January 19, 2012, 08:40:49 PM »

Hobby King #JETPUMP/13388 CNC Precision Jet Boat Drive - X-Large
December 2011 Production Batch:

Just received one of the Hobby King pumps. It took about 30 days to
ship one from Hong Kong to Colorado, USA. Not bad considering holiday
season.

Still no instructions included with the pump.

Overall Appearance: excellent

Referring to the earlier observations made in this thread (hobby king
jet unit photos) I will try to evaluate the current production.

Impeller Bearings and Seal: Appears to be same components as before.
  -Both bearings are marked "NMB SINGAPORE 608D". Finding spares for
the 608D should not be a problem. I think this bearing is commonly used
in skateboards which makes it available from many distributors. Ceramic
options may be available also.

  -The seal is marked "INA G 10-17-3 05-1". This seal is a little more
difficult to locate. It can be searched for by the term "INA G10173"
also.

Impeller Shaft: Fits the bearings and bushing well. No lateral motion
can be felt. The shaft is a good quality stainless steel as there is
no magnetic attraction.

Impeller: The impeller's set screw engages a flat on the impeller
shaft. The set screw is about 4mm long and only uses about one half
of the available threads. Changing this set screw to one about 6-8mm
long will provide better retention and be kinder to the aluminum threads
in the impeller hub.

Stator Bushing: I also wonder if either water flow or some means to
allow greasing might prolong it's life span.

Other than the impeller's set screw (too short) I don't know any
way HK could improve this product. HK does need to make some spare parts
available separately and maybe a master kit (shaft, bearings, seal,
impeller and stator bushing).
« Last Edit: January 28, 2012, 06:08:33 PM by LUV2squirt » Logged

LUV2squirt
Model Jet Boat Dot Com
We Do Impossible !!!  (Vitaly)
LUV2squirt
Full Member
***
Posts: 195



View Profile
« Reply #19 on: January 19, 2012, 08:49:37 PM »

Edited this post Jan. 28, 2012

The pics in my previous post have been resized. I hope this size works better.
« Last Edit: January 28, 2012, 06:10:48 PM by LUV2squirt » Logged

LUV2squirt
Model Jet Boat Dot Com
We Do Impossible !!!  (Vitaly)
Dicko
Sr. Member
****
Posts: 276


View Profile
« Reply #20 on: January 19, 2012, 09:22:57 PM »

to resize pics you can email them to yourself & that usually gives you an opption to shrink them, alternatively, microsoft photo editor is a good option.

I have one of these for a friend ready for install.  they are probably the best unit onthe market currently available, however there is two thiungs they can quickly and easliy improve.

1 - overlapping impeller blades
2 - having the bucket fit inside the rear of the pump like the Swashdrive Gen II to reduce backwash and improve thrust.

Another thing they can do is use sealed bushes instead of bearings on water contacted areas.  Water is a harsh environment for bearings and is one area of increased wear.  I'd also like to see a stator with grease pump nipple like the Swashdrive Gen II. 

These are just my thoughts on this pump.
Logged
LUV2squirt
Full Member
***
Posts: 195



View Profile
« Reply #21 on: January 20, 2012, 09:01:18 AM »

Lubrication of the impeller shaft:

If the seal provided works reasonably well then the two bearings should
survive OK if repacked at least once per year with grease (polyurea might
be optimal especially if using a high RPM purpose built marine engine).

My concern is having no significant water flow thru the stator bushing
(combined cooling and lubrication) or the means to add grease easily and/or
daily. The contacting surface of the shaft and the stator bushing will
generate significant heat. Even with the normal water flow passing thru
the pump (which cools the stator and the shaft) I'm guessing the heat surge
will cause rapid wear in the brass. Just a tiny bit of grease added
frequently would help a lot. If the stator tip is not thick enough to
support a Zirk (AKA Zirt) then perhaps a grease port could be drilled and
capped with a small socket cap screw? Then the grease "pocket" could be
injected (filled daily) with a needle. Might help with the friction/heat
issue......

Another good question is whether or not the bushing is an Alemite substance
or common brass. Other than a statement by the manufacturer I don't know
how to test and determine which it might be. Even if it is Alemite (which
I doubt) I would prefer to provide it with a little grease. If it is not
Alemite then the common brass is going to be screaming for grease.

I resized a pic using WIN 7's Paint application (Resize And Skew tool).
XP's Paint has a similar tool but it's labeled "Stretch And Skew". My camera
is already set to make small pics so I've resized one 30% using Paint. This
post should include a test upload (Grate and countersink screws) so I can see
if this helps with pic size.
Logged

LUV2squirt
Model Jet Boat Dot Com
We Do Impossible !!!  (Vitaly)
Snikwah
Administrator
Full Member
******
Posts: 169


View Profile Email
« Reply #22 on: January 21, 2012, 12:58:20 AM »

irfan veiw is a good little program to adjust pictures, resize , compress and make thumbnails.

Pretty good for 422kb file!

see attachment
Logged
LUV2squirt
Full Member
***
Posts: 195



View Profile
« Reply #23 on: January 21, 2012, 06:18:03 AM »

Years ago I used LViewPro for resizing pics - that worked great. Now I run
IRFanView but I've never figured out how to resize with it. Windows' Paint
makes resizing pretty simple - that's good for me 'cause I need simple when
it comes to manipulating graphic files.

Was wondering if anyone has ever removed the stator bushing? I would love
to pop it out but am hesitant to try as HK is still not offering any spare
parts. I sure don't want to crack my stator with my curiosity. LOL. I'm
betting that bushing is an off the shelf item from some supplier. Might come
in handy if we figure out how to remove them and insert replacement bushings.
Logged

LUV2squirt
Model Jet Boat Dot Com
We Do Impossible !!!  (Vitaly)
thefarside
Jr. Member
**
Posts: 71


View Profile
« Reply #24 on: January 21, 2012, 02:11:40 PM »

FYI to resize pictures in XP I use MS "image resizer" found here http://windows.microsoft.com/en-US/windows/downloads/windows-xp under "Power Tools". It is FREE and works great.


John
Logged
Snikwah
Administrator
Full Member
******
Posts: 169


View Profile Email
« Reply #25 on: January 22, 2012, 05:07:12 PM »

Now I run IRFanView but I've never figured out how to resize with it.

to resize with IRFanview click the Image tab then resize or

Ctrl +R
Logged
LUV2squirt
Full Member
***
Posts: 195



View Profile
« Reply #26 on: January 28, 2012, 06:13:10 PM »

OK. Thanks to everyone with help on the pics.
Logged

LUV2squirt
Model Jet Boat Dot Com
We Do Impossible !!!  (Vitaly)
LUV2squirt
Full Member
***
Posts: 195



View Profile
« Reply #27 on: February 09, 2012, 07:21:21 AM »

The metric flange bearings from Global Industrial (aka Global Equipment)
size = 6x9x12x2; Item No. T9AB350115 have not shipped. Called customer service
yesterday and did not make any progress AFAICT.

These are not easily found in the US. No big deal. I will cut a couple bearings
from 1/2 in. brass rod. Won't be as durable as an impregnated bearing but with the
grease pocket mod and the ease of inserting/removing properly fitted flanged bearings
this should be satisfactory for me.

If the one's from Global ever do show up, that is probably a much better solution
for having new replacements on hand and I will report if they ever do come through.
Logged

LUV2squirt
Model Jet Boat Dot Com
We Do Impossible !!!  (Vitaly)
Pages: 1 [2]
  Print  
 
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.11 | SMF © 2006-2009, Simple Machines LLC Valid XHTML 1.0! Valid CSS!