Performance curves for Universal M30 - SailNet Community
 
LinkBack Thread Tools
post #1 of 5 Old 07-30-2009 Thread Starter
Junior Member
 
Join Date: Jun 2004
Posts: 5
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Performance curves for Universal M30

Has anyone ever seen performance curves for universal diesels? I know they must exist but I have never seen them published. I'd like to see a fuel burn vs. RPM curve for my M30 (24hp).
dcmeigs is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #2 of 5 Old 07-30-2009
Senior Member
 
JimsCAL's Avatar
 
Join Date: May 2007
Location: Glen Cove, NY
Posts: 2,809
Thanks: 2
Thanked 70 Times in 65 Posts
Rep Power: 9
 
You'll never find one like that because fuel consumption vs RPM is dependent on the boat and prop in addition to the engine. Diesel fuel consumption per horsepower (lbm/hp-hr) is pretty constant in the middle to upper middle part of the operating range. The power it takes to push the hull through the water increases with about the cube of speed. So a 25% increase in speed takes twice as much power, more as you approach hull speed.
JimsCAL is offline  
Quote Quick Reply Share with Facebook
post #3 of 5 Old 08-01-2009 Thread Starter
Junior Member
 
Join Date: Jun 2004
Posts: 5
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Quote:
Originally Posted by JimsCAL View Post
You'll never find one like that because fuel consumption vs RPM is dependent on the boat and prop in addition to the engine.
Here is link a to a typical yanmar performance curve. It's on the second page. http://www.yanmarmarine.com/uploads/.../BY/6BY260.pdf

The curves are predicated on a prop choice that yields a proper RPM vs HP curve. What this really means is a predictable manifold pressure curve.

These curves are common in aircraft engines (required as a condition for certification) and they are expressed on a pair of graphs that begin with manifold pressure and RPM and then transisition to fuel burn on the second chart. It's really the same thing except that since our boats normally have a fixed pitch prop the relationship between manifold pressure and RPM is fixed and therefore known for a given prop. The assumption is made that the boat is proped correctly.

I'd like to see these curves for the Universal M30.
dcmeigs is offline  
Quote Quick Reply Share with Facebook
post #4 of 5 Old 08-01-2009
Chesapeake Sailor
 
wwilson's Avatar
 
Join Date: Jul 2000
Location: Herrington Harbor, MD
Posts: 579
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 16
 
wwilson is offline  
Quote Quick Reply Share with Facebook
post #5 of 5 Old 08-02-2009
Senior Member
 
JimsCAL's Avatar
 
Join Date: May 2007
Location: Glen Cove, NY
Posts: 2,809
Thanks: 2
Thanked 70 Times in 65 Posts
Rep Power: 9
 
The standard way engine performance curves are presented are HP, torque, and Specific Fuel Consumption versus engine RPM. Tests are run on a dyno at full throttle. See www.betamarinenc.com/722.htm for an example.
JimsCAL is offline  
Quote Quick Reply Share with Facebook
Reply

Quick Reply
Message:
Options

By choosing to post the reply above you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Register Now



In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.


User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
THE Yacht Builder List T37Chef Boat Review and Purchase Forum 26 07-08-2011 05:51 AM
Basic Downwind Performance, Part Two Zack Leonard Racing Articles 0 11-06-2003 07:00 PM
The Ultimate Performance Cruiser SailNet Racing Articles 0 06-27-2002 08:00 PM
Mainsail Controls for Performance Dan Dickison Racing Articles 0 07-04-2001 08:00 PM
Performance Basics for Routing Michael Carr Seamanship Articles 0 11-16-2000 07:00 PM

Posting Rules  
You may post new threads
You may 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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome