Expected Cruising Speed? - Page 2 - SailNet Community

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > General Interest > General Discussion (sailing related)
 Not a Member? 


Like Tree3Likes
Reply
 
LinkBack Thread Tools
  #11  
Old 06-12-2013
wooling's Avatar
Junior Member
 
Join Date: Jun 2013
Location: North Germany, near Hamburg
Posts: 23
Thanks: 4
Thanked 5 Times in 4 Posts
Rep Power: 0
wooling is on a distinguished road
Re: Expected Cruising Speed?

But not with 2200 rpm...... ;-)
Reply With Quote Quick reply to this message Share with Facebook
  #12  
Old 06-12-2013
jackdale's Avatar
Senior Member
 
Join Date: Dec 2008
Location: Calgary, AB, Canada
Posts: 8,966
Thanks: 27
Thanked 54 Times in 51 Posts
Rep Power: 7
jackdale will become famous soon enough
Re: Expected Cruising Speed?

Quote:
Originally Posted by wooling View Post
But not with 2200 rpm...... ;-)
True

The review posted showed 7.5 at 2500 rpm.

Other factors include

prop
bottom
towing
etc..
__________________
__________________
ISPA Yachtmaster Offshore Instructor Evaluator
Sail Canada Advanced Cruising Instructor
IYT Yachtmaster Coastal Instructor
ASA 201, 203, 204, 205, 206, 214
As I sail, I praise God, and care not. (Luke Foxe)
Reply With Quote Quick reply to this message Share with Facebook
  #13  
Old 06-12-2013
jimrafford's Avatar
Senior Member
 
Join Date: Jan 2011
Location: ct
Posts: 591
Thanks: 0
Thanked 13 Times in 13 Posts
Rep Power: 4
jimrafford is on a distinguished road
Re: Expected Cruising Speed?

We have a cs 40 w/ a 43hp volvo. About 19000lb disp. We cruise at a little over 7 and see 8.5 wot.
Jim
__________________
S/V Deja Vu
CS 40
Reply With Quote Quick reply to this message Share with Facebook
  #14  
Old 06-12-2013
Bene505's Avatar
Glad I found Sailnet
 
Join Date: Jul 2008
Posts: 3,724
Thanks: 6
Thanked 42 Times in 41 Posts
Rep Power: 8
Bene505 will become famous soon enough Bene505 will become famous soon enough
Re: Expected Cruising Speed?

Quote:
Originally Posted by wooling View Post
But not with 2200 rpm...... ;-)
The last bit of power makes the smallest difference. So 2200 rpm ought to be reasonably close to the 2500 rpm number.

Regards,
Brad
__________________
.
.
Great minds discuss ideas;
Average minds discuss events;
Small minds discuss people.
.
The best minds discuss sailing. I don't know why. It's a mystery!
.
Reply With Quote Quick reply to this message Share with Facebook
  #15  
Old 06-12-2013
grumpy old man
 
Join Date: Apr 2011
Posts: 3,793
Thanks: 1
Thanked 81 Times in 77 Posts
Rep Power: 4
bobperry will become famous soon enough
Re: Expected Cruising Speed?

8.4 knots is a bit optimistic at that rpm IMHO .
__________________
Please visit my blog. It's fun to read.


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

Bob's Blog ....

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


Please also visit my new web site
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Quick reply to this message Share with Facebook
  #16  
Old 06-12-2013
Member
 
Join Date: Mar 2008
Posts: 89
Thanks: 33
Thanked 4 Times in 3 Posts
Rep Power: 7
lowtide is on a distinguished road
Re: Expected Cruising Speed?

Quote:
Originally Posted by jackdale View Post
In theory

sqrt39.3*1.34 = 8.4 knots
The waterline is 35' 5" (35.4), so;

sqrt 35.4 * 1.34 = 7.97

Just like the review says.....


'
Reply With Quote Quick reply to this message Share with Facebook
The Following User Says Thank You to lowtide For This Useful Post:
jackdale (06-13-2013)
  #17  
Old 06-12-2013
travlineasy's Avatar
Morgan 33 O.I. Perryville
 
Join Date: Dec 2010
Location: Maryland
Posts: 2,630
Thanks: 3
Thanked 82 Times in 68 Posts
Rep Power: 5
travlineasy will become famous soon enough
Re: Expected Cruising Speed?

All those formulas make assumptions, ie..., clean bottom, perfect prop, dead calm conditions, etc..., most of which never seem to exist. I suspect that 7 would be very optimistic, and 6 would be somewhat more realistic under perfect conditions. Put some crud on the bottom, a couple barnacles on the prop, and 5 is about it.

Just sayin,

Gary
Ferretchaser likes this.
Reply With Quote Quick reply to this message 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:

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

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Solar Prices expected to go lower to $.70/watt h20man Electrical Systems 8 02-02-2012 11:32 AM
Is Retirement All You Expected and More ? wind_magic General Discussion (sailing related) 11 06-25-2010 08:23 PM
Expected starting current from 2GM? scraph Diesel 2 05-16-2010 06:34 PM
cruising speed beneteau 40 ronikokernoot Beneteau 4 08-29-2008 04:21 PM
Harder to pull than expected davidpm General Discussion (sailing related) 8 07-01-2008 11:45 AM


All times are GMT -4. The time now is 04:03 AM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012

The SailNet.com store is owned and operated by a company independent of the SailNet.com forum. You are now leaving the SailNet forum. Click OK to continue or Cancel to return to the SailNet forum.