Malta Fishing Forum
International Game Fish Association
News:
 
*
Latest Gallery Pictures






WEATHER FORECASTS
Luqa Station Malta North Virtual Buoy West Coast Dingli Cliffs Cirkewwa Mellieha
Pages: [1]
  Print  
Author Topic: How to find the gear box ratio  (Read 1682 times)
0 Members and 1 Guest are viewing this topic.
offken
Premium Member
Active User
***
Offline Offline

Posts: 40



« on: September 08, 2009, 19:34:16 CET »

I have two hurth Hsw 250 A gear boxes in my boat and I would like to know there ratio, the problem is that there is no name plates on them . Can some one tell me how can I find the ratio please .
                                 Thanks
Logged

Coronett powered by twin Isuzu 2.8
Granitu
Active User
***
Offline Offline

Posts: 1505


« Reply #1 on: September 08, 2009, 19:45:58 CET »

normally they are 2:1

the instructors manual should have
Logged

Good season so far.....
nando_s
VIP Member
Active User
*****
Offline Offline

Posts: 43



« Reply #2 on: September 08, 2009, 21:17:39 CET »

I have two hurth Hsw 250 A gear boxes in my boat and I would like to know there ratio, the problem is that there is no name plates on them . Can some one tell me how can I find the ratio please .
                                 Thanks

Hi offken, there are two available options for that gearbox. In the first case the forward and reverse ratio is the same namely 2.737 : 1. The second configuration you have different forward and reverse ratios, 2.737 : 1  and 2.227 : 1. Which ratio is used as forward in this case depends if you are using a right hand or left hand prop.

Although most gearboxes for light duty and pleasure are 2:1 or close enough you cannot assume anything. Each boat/prop/engine setup is unique.
Logged
joe
Active User
***
Offline Offline

Posts: 141


« Reply #3 on: September 08, 2009, 23:06:55 CET »

turn the main shaft one full rotation and see when looking at the prop how much it will turn.
Logged
nando_s
VIP Member
Active User
*****
Offline Offline

Posts: 43



« Reply #4 on: September 09, 2009, 08:50:04 CET »

Here is the spec sheet for your gearbox. Note that Hurth changed all the gearbox model names and this is what your HSW 250 A is equivalent to today.

* DS-ZF_25_MA.pdf (453.25 KB - downloaded 180 times.)
Logged
Pages: [1]
  Print  
 
Jump to:  

Recent Posts
[February 21, 2017, 17:58:04 CET]

[February 12, 2017, 14:35:53 CET]

[February 01, 2017, 05:40:37 CET]

[January 14, 2017, 14:31:24 CET]

[January 12, 2017, 21:59:32 CET]

[January 03, 2017, 14:24:20 CET]

[December 27, 2016, 14:19:50 CET]

[December 21, 2016, 21:24:04 CET]

[December 19, 2016, 14:07:25 CET]

[December 17, 2016, 20:26:05 CET]

[December 09, 2016, 12:28:21 CET]

[November 30, 2016, 15:51:29 CET]

[November 24, 2016, 07:53:23 CET]

[November 21, 2016, 17:28:42 CET]

[November 21, 2016, 06:19:12 CET]
Powered by MySQL Powered by PHP Powered by SMF 1.1.21 | SMF © 2015, Simple Machines | TinyPortal v0.9.8 © Bloc

Valid XHTML 1.0! Valid CSS! Dilber MC Theme by HarzeM