Reply
 
Thread Tools Search this Thread
 
Old 20 July 2014, 18:40   #1
Member
 
Country: UK - Scotland
Town: West Scotland
Boat name: Orca
Make: Humber Ocean Pro 5.5
Length: 5m +
Engine: Tohatsu 115 TLDI
Join Date: Oct 2007
Posts: 168
Tohatsu prop

Hi guys,
My Tohatsu 115hp tldi has a 19" stainless prop on it. 5.5m Humber Ocean Pro lightly loaded can hit 50mph (which is fun) and prop seems perfect for the (lightly laden, 3 up) boat, reaching proper revs at WOT. My issue is when the boat carries a good bit of weight. I dive and the boat is primarily for diving. When we have 5 divers and their kit in a moderate sea the boat won't plane, manages about 6mph and 2500rpm at WOT. Chucking someone and their kit out allows me to (finally) get on the plane and hit a dizzy 18mph with 4000rpm at WOT. My mates bigger Tornado (5.8m) with a 90 2 stoker on it easily leaves me in its wake. I guess I need a different prop. I'm not a speed junkie but would like the boat to get a decent turn of speed when heavily laden. I'm looking at dropping the pitch on a new prop. Thinking of either a 16" or 15". Think dropping to a 17" wouldn't be enough. Any ideas what would suit best?

Also any ideas who would supply Tohatsu props in the UK? Cant find any anywhere.

Ta.
__________________

__________________
Mr Flibble is offline   Reply With Quote
Old 20 July 2014, 20:10   #2
RIBnet supporter
 
MustRib's Avatar
 
Country: UK - England
Town: Newcastle
Boat name: Merlin
Make: RB4 Gemini 550
Length: 4m +
Engine: Tohatsu 90C
Join Date: Sep 2006
Posts: 1,048
Try checking these guys out
I have bought from them previously with no problems.
Home page

Other than that keep an eye on Ebay if your looking for a bargain.
Sometimes suitable props come up.
__________________
MustRib is offline   Reply With Quote
Old 21 July 2014, 00:37   #3
Member
 
Country: UK - England
Town: Truro-Cornwall & Brazil
Boat name: Bananas in Blue
Make: Humber Destroyer 5.5
Length: 5m +
Engine: E-Tec 115
Join Date: Jun 2007
Posts: 385
My Destroyer 5.5 with an E-tec 115 can just hit 46 miles an hour with a 19" prop though I do have the XL shaft with the V6 gearbox and a lower final drive ratio which makes it less top speed orientated and more of a load carrier. The speed does drop off as you add weight but I can easily get up to 35 mph with 7 or 8 in the boat.

For diving I'd probably look for a 4 blade rather than 3 and try a 15" initially though from what you have described you may even need to drop to 13". Steel developments mentioned by mustrib are probably your best bet.
__________________
Markyboyo is offline   Reply With Quote
Old 21 July 2014, 03:59   #4
Member
 
lukewhiting's Avatar
 
Country: UK - England
Town: swanage
Make: Thundercat
Length: 4m +
Engine: Tohatsu 50
Join Date: Apr 2012
Posts: 932
Proppeller solutions are great! The guy really knows his stuff
__________________
lukewhiting is offline   Reply With Quote
Old 23 July 2014, 07:44   #5
Member
 
Country: UK - Scotland
Town: West Scotland
Boat name: Orca
Make: Humber Ocean Pro 5.5
Length: 5m +
Engine: Tohatsu 115 TLDI
Join Date: Oct 2007
Posts: 168
Thanks guys, I'll give steel developments a call with the view to perhaps a 15" 4 blader.
__________________
Mr Flibble 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 11:54.


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