Go Back  Offshoreonly.com > Technical > General Q & A
Drive train losses >

Drive train losses


Drive train losses

Old 01-25-2002, 05:57 PM
Thread Starter
Join Date: Feb 2001
Posts: 1,519
Likes: 0
Received 29 Likes on 8 Posts
Post Drive train losses

Is there a general formula for determining losses through the drive train?

An HP500 delivers 470 HP @ 5200 to the prop through a Bravo drive, a 900SC delivers 850 HP @ 6000(?) RPM to the prop through a VI dry sump. These numbers define the efficiency of those drivetrains at the given RPM. But what happens above and below the RPM at which these numbers are measured?

I don't believe that these losses are a constant HP loss or a constant % HP loss. My guess is that these losses go up as some power of RPM.

Any mechanical engineers out there?
tomcat is offline  
Old 01-25-2002, 11:21 PM
Join Date: Jan 2001
Location: PA and MD
Posts: 1,461
Received 2 Likes on 1 Post

Hi, I was looking at BAM's site yesterday reading everything for the zillionth time but they have a 'trans dyno' which can dial in a rpm and measure on a strain guage how much HP is requuired to achieve that rpm. Now how about hooking up the input shaft of a bravo 1 or input of trans and TRS drive and measure the Hp required to spin at 2,3,4,5,6,7,8000 rpm. I think that is what you need. My computer here at work is doing great with excel. I'm wandering around and getting a feel for it and it seems to work for all my data. I'm still playing. Thanks.
cobra marty is offline  
Related Topics
Thread Starter
Last Post
General Q & A
01-12-2007 09:30 AM
Pure Energy
General Boating Discussion
09-29-2003 04:10 PM
General Boating Discussion
06-26-2002 06:00 PM

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Quick Reply: Drive train losses

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell or Share My Personal Information -

Copyright © 2023 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.