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Old 20 July 2014, 22:40   #1
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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: 172
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.
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Old 21 July 2014, 00:10   #2
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Country: UK - England
Town: Newcastle
Boat name: Merlin
Make: RB4 Gemini 550
Length: 4m +
Engine: Tohatsu 90C
Join Date: Sep 2006
Posts: 1,080
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.
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Old 21 July 2014, 04:37   #3
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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: 386
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.
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Old 21 July 2014, 07:59   #4
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Country: UK - England
Town: swanage
Make: Thundercat
Length: 4m +
Engine: Tohatsu 50
Join Date: Apr 2012
Posts: 968
Proppeller solutions are great! The guy really knows his stuff
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Old 23 July 2014, 11:44   #5
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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: 172
Thanks guys, I'll give steel developments a call with the view to perhaps a 15" 4 blader.
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