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Old 28 October 2005, 08:36   #11
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The reason I ask is the best I managed from a Tohatsu 6.6m with 150 Opti was 55mph down southampton water on a very flat calm day with 19" inch prop. If you have managed to get a Solent which is similar but heavier lay up to do 57 mph thats some going, fast boat.

Xpertski, if it helps a 6.5m Ribtec with old type 150 Mariner did 38 knots. You could spend a lot of time testing to get the humber to go a little faster but would it be useable speed? or would the bigger prop, higher engine height etc mean that acceleration was compromised and make it a less enjoyable boat and what would happen when you put lots of people on board ?

Pete
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Old 28 October 2005, 08:58   #12
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Yes, really, with about 20% full tank. Trim was spot on. Measured with GPS. Conditions were perfect. It is a fun and fast boat.
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Old 28 October 2005, 09:05   #13
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There are almost enough of these Solents about to have a race series
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Old 28 October 2005, 09:10   #14
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Perhaps a short one at 56 l/hr! However, normal cruise at 25 knots is 20 l/hr.
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Old 28 October 2005, 09:45   #15
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well well...... give me my yams anyday!!!!!!!!!!!!!!! - although I would have preferred suks when re -engined in july.

I believe that the suk is slightlly more advanced than yams- but quite frankly dont know i thing about it. All I know is that i turn the key and they work-- and they run bloody well.

Jonathan
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Old 28 October 2005, 09:55   #16
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I am a bit concerned about how well a 19" pitch prop will push my boat along - it may be too fine for a heavy boat with 500 litres of fuel.

Am I right in thinking that a 19" 4 blade will behave more like a 21" 3 blade or doesn't it make much of a difference - also as I have a transom jack will loweing the prop in the water overcome the fine pitch?
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Old 28 October 2005, 10:06   #17
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Quote:
Originally Posted by codprawn
I am a bit concerned about how well a 19" pitch prop will push my boat along - it may be too fine for a heavy boat with 500 litres of fuel.

Am I right in thinking that a 19" 4 blade will behave more like a 21" 3 blade or doesn't it make much of a difference - also as I have a transom jack will loweing the prop in the water overcome the fine pitch?

Sorry codders, on the second bit.. pass. On the first - its more trial and error and good trim. With the 225 go for a 23". On my 250 yams - the 25" gives 56.knts - but loosing 500 rpm. Johnny Fuller should advise you on this.
The 19" is probably not the right one for a 225... but its realy trial and error.

Jonathan
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Old 28 October 2005, 10:34   #18
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Quote:
Originally Posted by Pete7
There are almost enough of these Solents about to have a race series
Can you say Tohatsu one design? (although I suspect this is what you are alluding too Pete.)
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Old 28 October 2005, 10:45   #19
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Quote:
Originally Posted by codprawn
I am a bit concerned about how well a 19" pitch prop will push my boat along - it may be too fine for a heavy boat with 500 litres of fuel.

Am I right in thinking that a 19" 4 blade will behave more like a 21" 3 blade or doesn't it make much of a difference - also as I have a transom jack will loweing the prop in the water overcome the fine pitch?

Pop it in the water and find out?

I'm sure the builders will be carrying out some trials and will try a couple of different props.
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Old 28 October 2005, 11:00   #20
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Quote:
Originally Posted by Searider
Pop it in the water and find out?

I'm sure the builders will be carrying out some trials and will try a couple of different props.

that is the only way - but I supplied the engine and prop - asked for a 21" but they sent a 19" - maybe I will keep that one for high speed light work and get another for when fully laden.
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