Overpropped; What to do? - Page 4 - SailNet Community
LinkBack Thread Tools
post #31 of 32 Old 04-19-2013
Senior Member
Join Date: Jan 2013
Location: Montreal, QC, Canada
Posts: 363
Thanks: 0
Thanked 14 Times in 13 Posts
Rep Power: 5
Re: Overpropped; What to do?

The sweet spot is hull speed and maximum torque without current and head winds. Resulting in a smaller engine to supply the needs.
Max torque is at a lower rpm on electric motors, diesels and then gasoline engines, in that order.
I've been thinking that Bombardiers new passenger jet, is gearing the turbines prior to the combustion turbines, in an effort to reach maximum torgue at the desired cruising speed.
Pitch is a combination of the angle of attack of the blade and its surface area. If you cut only its surface area, theen the blade will achieve a lesser distance thru the water than before it was cut.
sony2000 is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
post #32 of 32 Old 04-20-2013
Senior Member
tommays's Avatar
Join Date: Sep 2008
Posts: 4,304
Thanks: 1
Thanked 34 Times in 34 Posts
Rep Power: 9
Re: Overpropped; What to do?


It is a motor with mechanical fuel injection which is THE problem being resolved

The mechanical fuel injection system will input excessive fuel based on throttle setting regardless of the RPM the motor makes

The extra fuel does bad things to motor and it is as simple as that

Any displacement hull will have a Huge prop slip number due to the need to NOT drag a bucket size prop through the water when sailing

1970 Cal 29 Sea Fever

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

1981 J24 Tangent 2930
Northport NY

If a dirty bottom slows you down what do you think it does to your boat
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Last edited by tommays; 04-20-2013 at 07:02 AM.
tommays is offline  
Quote Quick Reply Share with Facebook

Quick Reply

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


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

Email Address:


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
overpropped vs underpropped groundhog Gear & Maintenance 45 12-19-2012 10:20 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