Reply
 
Thread Tools Display Modes
 
Old 02-24-2014, 06:58 PM   #21
Guru
 
CaptTom's Avatar
 
City: Southern Maine
Country: USA
Vessel Name: Cygnus
Vessel Model: Prairie 36 Coastal Cruiser
Join Date: Dec 2012
Posts: 1,373
Why is full displacement a requirement for you? I'm only asking because when I was looking, I too was in the hull-speed-only camp. My theory was that I wanted to go farther and more comfortably, and was willing to go slower to achieve that.

I ended up with what you see on the left, a 36' Prairie. It's technically a semi-displacement. It can go above hull speed, but only at great cost in fuel. I have no intention of doing so very often, and could easily live without it. My point is that I'm glad I didn't limit my search to only FD hulls.
__________________
Advertisement

CaptTom is offline   Reply With Quote
Old 02-24-2014, 07:14 PM   #22
Guru
 
City: Pensacola
Country: USA
Join Date: May 2012
Posts: 748
Quote:
Originally Posted by psneeld View Post

Hey my first post suggested that us tweeners are so bad....
Lol you're evil. :-)
__________________

Blue Heron is offline   Reply With Quote
Old 02-24-2014, 07:29 PM   #23
Guru
 
Nomad Willy's Avatar
 
City: Concrete Washington State
Country: USA
Vessel Name: Willy
Vessel Model: Willard Nomad 30'
Join Date: Oct 2007
Posts: 13,707
Quote:
Originally Posted by Larry M View Post
You should be. Good list.

Except for the Sundowner and I don't know about the Prarie.
__________________
Eric

North Western Washington State USA
Nomad Willy is offline   Reply With Quote
Old 02-24-2014, 07:56 PM   #24
Enigma
 
RT Firefly's Avatar
 
City: Slicker?
Country: Bumpkin?
Join Date: Oct 2007
Posts: 9,995
Greetings,
__________________
RTF
RT Firefly is offline   Reply With Quote
Old 02-24-2014, 08:03 PM   #25
Senior Member
 
bikeandboat's Avatar
 
City: Maumelle, AR
Country: United States
Join Date: Jan 2013
Posts: 106
The reason for wanting to consider a FD hull is somewhat technical. The short of it is that a Full Displacement hull speed can be attained with a small engine running at its most efficient speed VS a SD hull, such as the one I have with a 200 HP Perkins, will run at or just over hull speed at a failry low RPM which is not the optimum for that engine. This explanation is simple to say the least.
bikeandboat is offline   Reply With Quote
Old 02-24-2014, 08:33 PM   #26
Guru
 
psneeld's Avatar
 
City: Avalon, NJ
Country: USA
Vessel Name: Freedom
Vessel Model: Albin 40
Join Date: Oct 2011
Posts: 15,877
Quote:
Originally Posted by bikeandboat View Post
The reason for wanting to consider a FD hull is somewhat technical. The short of it is that a Full Displacement hull speed can be attained with a small engine running at its most efficient speed VS a SD hull, such as the one I have with a 200 HP Perkins, will run at or just over hull speed at a failry low RPM which is not the optimum for that engine. This explanation is simple to say the least.
Most of this crowd is way past that level...that's why some of us are saying a semi at displacement speeds is going to be very economical, very close to a displacement hull economy, but you have way more options.

My 40 is way bigger and heavier than your 34 but only has a 120 instead of 200hp...most of the time I wish it were a 75-80hp engine but even that little diff in economy isn't going to amount to much if the rest of the boat isn't a good fit for me in the long run.
psneeld is offline   Reply With Quote
Old 02-24-2014, 08:33 PM   #27
Guru
 
O C Diver's Avatar
 
City: Fort Myers, FL... Summers in Crisfield, MD
Country: USA
Vessel Name: Slow Hand
Vessel Model: Cherubini Independence 45
Join Date: Dec 2010
Posts: 4,813
Quote:
Originally Posted by bikeandboat View Post
The reason for wanting to consider a FD hull is somewhat technical. The short of it is that a Full Displacement hull speed can be attained with a small engine running at its most efficient speed VS a SD hull, such as the one I have with a 200 HP Perkins, will run at or just over hull speed at a failry low RPM which is not the optimum for that engine. This explanation is simple to say the least.
Think out side the box.

Bought my Cherubini in January with a Cummins C 450. Hull is somewhere between SD and SP. Purchased a 4 cylinder John Deere (107-137 HP) and will do the swap this summer. The motor is almost an even dollar swap as the one coming out is low hours, still made, and in demand. Will use same transmission and shaft. Will need to change wheel and plumbing. Lot easier to put a smaller motor where a bigger one was.

Here is my point, you may find a fuel guzzling SD that is a hard sell. Save enough on the purchase to repower.

Ted
__________________
Blog: mvslowhand.com
I'm tired of fast moves, I've got a slow groove, on my mind.....
I want to spend some time, Not come and go in a heated rush.....
"Slow Hand" by The Pointer Sisters
O C Diver is offline   Reply With Quote
Old 02-24-2014, 08:42 PM   #28
Dauntless Award
 
Wxx3's Avatar
 
City: New York, NY
Country: USA
Vessel Name: Dauntless
Vessel Model: Kadey Krogen 42 - 148
Join Date: Jan 2013
Posts: 2,312
great list.
__________________
M/Y Dauntless, New York
a Kadey Krogen 42 Currently https://share.delorme.com/dauntless
Blog: https://dauntlessatsea.com
Find us: https://share.delorme.com/dauntless
Wxx3 is offline   Reply With Quote
Old 02-24-2014, 08:43 PM   #29
Dauntless Award
 
Wxx3's Avatar
 
City: New York, NY
Country: USA
Vessel Name: Dauntless
Vessel Model: Kadey Krogen 42 - 148
Join Date: Jan 2013
Posts: 2,312
Quote:
Originally Posted by psneeld View Post
Most of this crowd is way past that level...that's why some of us are saying a semi at displacement speeds is going to be very economical, very close to a displacement hull economy, but you have way more options.

My 40 is way bigger and heavier than your 34 but only has a 120 instead of 200hp...most of the time I wish it were a 75-80hp engine but even that little diff in economy isn't going to amount to much if the rest of the boat isn't a good fit for me in the long run.
and that's (only 120 hp) is one of the reasons your boat is so economical at displacement speeds.
__________________
M/Y Dauntless, New York
a Kadey Krogen 42 Currently https://share.delorme.com/dauntless
Blog: https://dauntlessatsea.com
Find us: https://share.delorme.com/dauntless
Wxx3 is offline   Reply With Quote
Old 02-24-2014, 08:44 PM   #30
Master and Commander
 
markpierce's Avatar
 
City: Vallejo CA
Country: USA
Vessel Name: Carquinez Coot
Vessel Model: 2011 Seahorse Marine Coot hull #6
Join Date: Sep 2010
Posts: 10,262
Quote:
Originally Posted by bikeandboat View Post
The reason for wanting to consider a FD hull is somewhat technical. The short of it is that a Full Displacement hull speed can be attained with a small engine running at its most efficient speed VS a SD hull, such as the one I have with a 200 HP Perkins, will run at or just over hull speed at a failry low RPM which is not the optimum for that engine. This explanation is simple to say the least.
So true. Most mid-sized boats have two engines or at least one engine totaling 160 to 400+ horsepower. Less than 100 is needed for hull speed. I've got 80 and it's plenty to push 14 tons.
__________________
Kar-KEEN-ez Koot
markpierce is offline   Reply With Quote
Old 02-24-2014, 09:18 PM   #31
Guru
 
Brooksie's Avatar
 
City: Cape Cod, MA
Country: USA
Vessel Name: Island Seeker
Vessel Model: Willard 36 Sedan
Join Date: Oct 2007
Posts: 954
Quote:
Originally Posted by bikeandboat View Post
The reason for wanting to consider a FD hull is somewhat technical. The short of it is that a Full Displacement hull speed can be attained with a small engine running at its most efficient speed VS a SD hull, such as the one I have with a 200 HP Perkins, will run at or just over hull speed at a failry low RPM which is not the optimum for that engine. This explanation is simple to say the least.
That is a good reason but a better one is the FD's ability to carry weight (fuel stores) and its superior seakeeping not only in following conditions but in head seas.
Brooksie is offline   Reply With Quote
Old 02-24-2014, 09:31 PM   #32
Senior Member
 
bikeandboat's Avatar
 
City: Maumelle, AR
Country: United States
Join Date: Jan 2013
Posts: 106
Quote:
Originally Posted by Brooksie View Post
That is a good reason but a better one is the FD's ability to carry weight (fuel stores) and its superior seakeeping not only in following conditions but in head seas.
I very much agree. When explaining why I wanted a FD in place of the SD I own I tried to keep it more simple than not. Thanks for bring up these points.
bikeandboat is offline   Reply With Quote
Old 02-24-2014, 09:51 PM   #33
Veteran Member
 
City: Long Beach, CA
Country: USA
Vessel Name: FREEDOM
Vessel Model: 40 BLUEWATER PILOTHOUSE TRAWLER
Join Date: Feb 2014
Posts: 60
Here's my 40' Bluewater Pilothouse Trawler. FD 9 knot max with 428 gallons of fuel....it's a long range tank. Currently in full restoration mode with re-power in the future. Looked for a long time until I came across her.
Attached Thumbnails
Click image for larger version

Name:	FREEDOM II.JPG
Views:	117
Size:	94.6 KB
ID:	27649  
Capt. JB is offline   Reply With Quote
Old 02-24-2014, 10:00 PM   #34
Guru
 
N4712's Avatar
 
City: South FL
Country: U.S.A
Vessel Name: Oliver
Vessel Model: Nordhavn 47 Hull# 12
Join Date: Apr 2013
Posts: 3,613
Quote:
Originally Posted by Capt. JB View Post
Here's my 40' Bluewater Pilothouse Trawler. FD 9 knot max with 428 gallons of fuel....it's a long range tank. Currently in full restoration mode with re-power in the future. Looked for a long time until I came across her.
More pics!!!!!!!!!!Please!!!!!!!!!
__________________
Thanks, Oliver
M/V Oliver
Nordhavn 47 Hull #12
N4712 is offline   Reply With Quote
Old 02-24-2014, 10:10 PM   #35
Veteran Member
 
City: Long Beach, CA
Country: USA
Vessel Name: FREEDOM
Vessel Model: 40 BLUEWATER PILOTHOUSE TRAWLER
Join Date: Feb 2014
Posts: 60
I will get some more next week. I've totally changed the layout, started fiber-glassing the decks, and the list goes on...I'll post my progress.

-Josh
Capt. JB is offline   Reply With Quote
Old 02-24-2014, 10:55 PM   #36
Senior Member
 
nwboater's Avatar
 
City: Whidbey Island WA
Country: USA
Vessel Name: MV Kika
Vessel Model: Selene 47 Ocean Trawler
Join Date: Oct 2008
Posts: 187
Not to be critical of different hull types... but you need to experience the unique feel and motion of a heavy-built FD boat working through head seas or riding on top a following sea. I've owned semi-displacement boats and now a Willard 40 from the seventies. With her tanks full (350 water, 600 fuel) and single Lehman turning at 1500 rpm, Northstar shoulders along at 7+ knots in comfort and considerable economy (1.5gal/hr). For most recreational boating, the difference between SD and FD is academic -- until the wind picks up and seas turn nasty, that is when I'm grateful for the extra heft that comes as "standard equipment" on a full displacement boat.
__________________
Richard Soto
MV Kika, Selene 47 Ocean Trawler
nwboater is offline   Reply With Quote
Old 02-24-2014, 11:08 PM   #37
Al
Guru
 
Al's Avatar
 
City: ketchikan, Alaska
Country: usa
Vessel Name: 'SLO'~BELLE
Vessel Model: 1978 Marben-27' Flybridge Trawler Pilothouse Pocket Cruiser[
Join Date: Apr 2012
Posts: 1,690
Wow! I am amazed-Healhustler. Awaiting Eric's complete explanation on what a FD and SD hull conforms to. I would guess that the vast majority of the boats you named have the same bottom configuration or very close, to our 27 Marben which Eric has classified as SD. Following his classification, I did in deed acquire a "New Build" Marben production sheet that clearly identified the hull as a SD. confirming Eric. So having said, I would believe that a hull that BikeandBoat seeks has to be modeled on a North Sea hull, Alaska classic Halibut schooner, early Alaskan troller, or a motor sailer sans the mast and gear. or accept a larger boat in a SD and as suggested-slow it down. That is what we do. I can accept being a SD and run it as a FD. Just saying.
Al
Al is offline   Reply With Quote
Old 02-24-2014, 11:38 PM   #38
Guru
 
healhustler's Avatar
 
City: Longboat Key, FL
Country: USA
Vessel Name: Bucky
Vessel Model: Krogen Manatee 36 North Sea
Join Date: Oct 2009
Posts: 4,178
Quote:
Originally Posted by Capt. JB View Post
Here's my 40' Bluewater Pilothouse Trawler. FD 9 knot max with 428 gallons of fuel....it's a long range tank. Currently in full restoration mode with re-power in the future. Looked for a long time until I came across her.
Sure love that Bluewater. And is that a real.Portuguese Bridge? Looks like a heavy vessel. More pics!
__________________
Larry

"I'd rather be happy than dignified".
healhustler is offline   Reply With Quote
Old 02-25-2014, 12:20 AM   #39
Veteran Member
 
City: Long Beach, CA
Country: USA
Vessel Name: FREEDOM
Vessel Model: 40 BLUEWATER PILOTHOUSE TRAWLER
Join Date: Feb 2014
Posts: 60
Yes, yes (33,000 lb displacement), and I will definitely get more pics...and to comment on what NWboater stated, the stability of a FD is very noticeably on those rough days. The wife and kids feel extremely safe and this is key.
Capt. JB is offline   Reply With Quote
Old 02-25-2014, 01:30 AM   #40
TF Site Team
 
Bay Pelican's Avatar
 
City: Chicago, IL
Country: USA
Vessel Name: Bay Pelican
Vessel Model: Krogen 42
Join Date: Oct 2007
Posts: 2,785
Great list, thanks
__________________

__________________
Marty
Bay Pelican 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 04:34 AM.


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