Reply
 
Thread Tools Search this Thread
 
Old 13 March 2007, 23:59   #11
Member
 
Country: UK - Wales
Town: swansea
Boat name: Too Blue
Make: BLANK
Length: 8m +
Engine: Suzuki DT225
Join Date: Mar 2004
Posts: 12,791
Props just aren't suited to gearboxes. That's why planes use variable pitch instead of change gears.
__________________

__________________
codprawn is offline   Reply With Quote
Old 14 March 2007, 05:57   #12
Member
 
Pete7's Avatar
 
Country: UK - England
Town: Gosport
Boat name: April Lass
Make: Moody 31
Length: 9m +
Join Date: Aug 2001
Posts: 4,850
Quote:
Originally Posted by codprawn View Post
Props just aren't suited to gearboxes. That's why planes use variable pitch instead of change gears.
Being able to wind up a diesel until the turbo really kicks in then changing up would be an advantage in getting a boat on the plane. However I suspect the costs of developing such a system is the main draw back.

Pete
__________________

__________________
.
Ribnet is best viewed on a computer of some sort
Pete7 is offline   Reply With Quote
Old 14 March 2007, 06:12   #13
Member
 
Cookee's Avatar
 
Country: UK - England
Town: Salcombe, Devon, UK
Boat name: BananaShark
Make: BananaShark
Length: 10m +
Engine: 2xYanmar 260 diesels
Join Date: Mar 2003
Posts: 4,225
The Trimax in Buzzis RIB is the same system fitted to the Sunseekers, he has just made it fit the hull as one unit.
__________________
Cookee
Originally Posted by Zippy
When a boat looks that good who needs tubes!!!
Cookee is offline   Reply With Quote
Old 14 March 2007, 06:19   #14
Member
 
Country: UK - England
Town: Over here
Boat name: S.S. Nobstick
Make: Three Wise Monkeys
Length: 3m +
Engine: 44lbs of thrust....
Join Date: Nov 2003
Posts: 2,115
Quote:
Originally Posted by Pete7 View Post
Being able to wind up a diesel until the turbo really kicks in then changing up would be an advantage in getting a boat on the plane. However I suspect the costs of developing such a system is the main draw back.

Pete
Rip out that ropey ol' Coal burner and put a proper engine in... there's another option.
__________________
Jono is offline   Reply With Quote
Old 14 March 2007, 06:43   #15
Member
 
Pete7's Avatar
 
Country: UK - England
Town: Gosport
Boat name: April Lass
Make: Moody 31
Length: 9m +
Join Date: Aug 2001
Posts: 4,850
Quote:
Originally Posted by Jono View Post
Rip out that ropey ol' Coal burner and put a proper engine in... there's another option.
Oi, thats my pride and joy at least some of us on here have got a boat, even JK .......
__________________
.
Ribnet is best viewed on a computer of some sort
Pete7 is offline   Reply With Quote
Old 14 March 2007, 07:41   #16
Member
 
Country: UK - England
Town: Over here
Boat name: S.S. Nobstick
Make: Three Wise Monkeys
Length: 3m +
Engine: 44lbs of thrust....
Join Date: Nov 2003
Posts: 2,115
Quote:
Originally Posted by Pete7 View Post
.... at least some of us on here have got a boat, even JK .......
*ahem*.. you'd be amazed at what's in my shed....
__________________
Jono is offline   Reply With Quote
Old 14 March 2007, 16:38   #17
RIBnet admin team
 
Nos4r2's Avatar
 
Country: UK - England
Town: The wilds of Wiltshire
Boat name: WhiteNoise/Dominator
Make: Ballistic 7.8/SR5.4
Length: 7m +
Engine: Opti 225/Yam 85
MMSI: 235090687/235055163
Join Date: Jul 2005
Posts: 12,645
RIBase
Quote:
Originally Posted by Jono View Post
*ahem*.. you'd be amazed at what's in my shed....
Is that amazed or disgusted?
__________________
Need spares,consoles,consumables,hire,training or even a new boat?

Please click HERE and HERE and support our Trade Members.

Join up as a Trade member or Supporter HERE
Nos4r2 is offline   Reply With Quote
Old 16 March 2007, 05:58   #18
Member
 
Country: UK - Isle of Man
Town: port st mary
Boat name: Orange Peel
Make: Delta
Length: 5m +
Engine: Mercury 90
Join Date: May 2006
Posts: 96
?
__________________
Mouldy is offline   Reply With Quote
Old 16 March 2007, 06:01   #19
Member
 
Country: UK - Isle of Man
Town: port st mary
Boat name: Orange Peel
Make: Delta
Length: 5m +
Engine: Mercury 90
Join Date: May 2006
Posts: 96
Quote:
Originally Posted by codprawn View Post
Props just aren't suited to gearboxes. That's why planes use variable pitch instead of change gears.
Is this for acceleration? Essential for a plane even on water (anyone got a flying boat? I'd like a go - Free self contained accommodation for 2 in the Isle of Man for 100th anniversary TT celebrations in June to the lucky winner)

Once the boat speed is achieved at 4/5ths open throttle, wouldn't a higher gear drop the engine revs and maintain prop revs assuming the engine has the torque to manage the gearing?
You'd lose reponsiveness if the speed over water and engine revs drop - current, headwind etc - so perhaps an automatic/autopilot/cruisecontrol combo is required. Come on AquaTechs - sort it out not just for top end sunseekers - I bet a widebody 7mCoastline would be perfect - top cruising speed at 1/3rd throttle, extended range...
__________________
Mouldy is offline   Reply With Quote
Old 16 March 2007, 12:16   #20
Member
 
Cookee's Avatar
 
Country: UK - England
Town: Salcombe, Devon, UK
Boat name: BananaShark
Make: BananaShark
Length: 10m +
Engine: 2xYanmar 260 diesels
Join Date: Mar 2003
Posts: 4,225
Quote:
Originally Posted by Mouldy View Post
Is this for acceleration? Essential for a plane even on water (anyone got a flying boat? I'd like a go - Free self contained accommodation for 2 in the Isle of Man for 100th anniversary TT celebrations in June to the lucky winner)

Once the boat speed is achieved at 4/5ths open throttle, wouldn't a higher gear drop the engine revs and maintain prop revs assuming the engine has the torque to manage the gearing?
You'd lose reponsiveness if the speed over water and engine revs drop - current, headwind etc - so perhaps an automatic/autopilot/cruisecontrol combo is required. Come on AquaTechs - sort it out not just for top end sunseekers - I bet a widebody 7mCoastline would be perfect - top cruising speed at 1/3rd throttle, extended range...
Actually you really don't need a gearbox for most smaller boats under around 30 feet - the acceleration is acceptable and they rev out at top speed, so a gearbox is just an unnecessary expense! (and pointless)
__________________

__________________
Cookee
Originally Posted by Zippy
When a boat looks that good who needs tubes!!!
Cookee is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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





Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 11:46.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.