Reply
 
Thread Tools Display Modes
 
Old 08-15-2014, 11:59 AM   #21
Guru
 
ranger42c's Avatar
 
City: Maryland
Country: USA
Vessel Model: 42' Sportfish
Join Date: Aug 2013
Posts: 3,159
Quote:
Originally Posted by Wzdr02 View Post
So.... To liveaboard florida and the bahamas and the islands, a Viking or Hattaras in the 40-44 foot range is a bad Idea?

Don't think I saw where anyone said that. I'd probably even go bigger, budget permitting, since living aboard can get a bit cramped... for me. Couldn't do it on our 42 sportfish. Might be better (more room) on a motor yacht in that range, if you like that sorta thing. YMMV.

-Chris
__________________
Advertisement

__________________
South River, Chesapeake Bay
ranger42c is online now   Reply With Quote
Old 08-15-2014, 12:08 PM   #22
Guru
 
ranger42c's Avatar
 
City: Maryland
Country: USA
Vessel Model: 42' Sportfish
Join Date: Aug 2013
Posts: 3,159
Quote:
Originally Posted by FF View Post
Firts of all any boat cruising at hull speed is very very expensive. Hull Speed is a sailors concept , enough free wind and even a Tahiti Ketch can do it.

Cruising at SL, (the square root of the waterline) is the usual cheap spot,actually .9 to 1,15 times SL, depending on the boat.Light skiney boats do better than fat heavy roomarans.

Cruising at hull speed, SL times 1.34 will cost at least 2x the fuel, and on many boats 3x the SL fuel burn.

On some lighter boats it is actually cheaper to get up on the plane , where wave making resistance drops , and the nautical MPG goes down.

Puttering about at trawler crawler speeds is fine in an old high speed vessel, just forgetabout hull speed, you cant afford it.

I think I understand your point, but I'd say words like "very, very" can cover a very, very wide range.

Our hull speed (LWL of about 39') is approx. 8.4 kts, and our nominal fuel burn at ~8.2 kts gives us about 1.7 NMPG. SL is about 6.3 kts, and we get about 2.9 NMPG at ~6.5 kts.

Yes, 1.7 is very, very bad compared to 2.9. And yes, cruising at SL is relatively cheap (in the grand scheme of "things boat" compared to theoretical hull speed.

OTOH, when we cruise at ~22-23 kts, where the hull is usually most comfortable when were on plane, we're only getting about .7 NMPG.

So there's very, very... and then there's very, very.

-Chris
__________________

__________________
South River, Chesapeake Bay
ranger42c is online now   Reply With Quote
Reply

Thread Tools
Display Modes

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 Off
Pingbacks are Off
Refbacks are Off





All times are GMT -5. The time now is 12:58 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012