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Old 28 August 2008, 02:36   #21
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Originally Posted by Downhilldai View Post
Mine's the same - most I've seen is 5200rpm
Mine's never seen more than 5200 rpm either
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Old 28 August 2008, 11:47   #22
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Yeh, but you might not get any more speed! I assum you're going to find a prop to give you those extra revs?
No Andy 42knts is good enough for me.im running the 21" stainless that came as standard. Although i do have a 19" stainless i could play around with.Just getting out on the water will be good enough at the moment, with this crap weather.hopefully september may be a little better.
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Old 28 August 2008, 20:58   #23
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Ooooh that looks very nice

Sorry to hear about the top speed though, even my stinky old 2 stroke powered Humber goes faster than that (about 38kt usually, on 115hp, have seen over 40kt lightly loaded). The chances of a new rib are receding into the middle distance these days so I guess I will never have to worry about it
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Old 29 August 2008, 07:48   #24
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forgot to mention. im not running at max rpm yet, got to try and squeeze another 400revs somehow

What RPM are you reading at 42kts?
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Old 29 August 2008, 10:34   #25
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What RPM are you reading at 42kts?
5,100 revs, there was probably a bit more trim to use as well. i am running with a bit extra weight though, extra seating.aux,double Aframe,and so on,
what top end are you achieving with the 150.Waverunner is running a 115 on his humber 5.5 destroyer, managing 40 knts, he couldnt quite catch me. which i was surprised about as the destroyer is a lighter boat. untill he re-
props and then it could be a different matter.I might have to invest in a 175
ecu.
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Old 29 August 2008, 10:37   #26
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These shots are on Port Philip Bay.
buy the way, the boat looks stunning
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Old 29 August 2008, 14:02   #27
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...what top end are you achieving with the 150....
Max I've hit is 46kt, trimmed out, with just me aboard and not much fuel. It's set-up with cav plate 50mm above keel pad, 21" Laser II prop and with the motor trimmed out, I can rarely get more than 5000rpm, which gives 43-44kt, with 2 on board and around 100 litres of fuel. It also has heavy 2" double A-frame and a fair load of kit on board, but only 2 single seat pods. My aft pods are removable - they've never been out of the garage
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Old 29 August 2008, 18:20   #28
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buy the way, the boat looks stunning
Thank you I think so too!
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Old 30 August 2008, 07:49   #29
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Quote:
Originally Posted by Downhilldai View Post
Max I've hit is 46kt, trimmed out, with just me aboard and not much fuel. It's set-up with cav plate 50mm above keel pad, 21" Laser II prop and with the motor trimmed out, I can rarely get more than 5000rpm, which gives 43-44kt, with 2 on board and around 100 litres of fuel. It also has heavy 2" double A-frame and a fair load of kit on board, but only 2 single seat pods. My aft pods are removable - they've never been out of the garage
interesting. and even more interesting is according to our local mercury dealer
the 135 is now dearer than the 150. is this true and any ideas why.

Dai, is yours a long or extra long. mine is allso set at 2.5" above the keel pad.
and have you tried different props. Although 46knts on a 5.8 is enought to
clear any bad hangover.
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Old 30 August 2008, 09:25   #30
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Quote:
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...the 135 is now dearer than the 150. is this true and any ideas why.
No idea - they're the same basic motor, except the 135 has a lower ratio gearbox.

Quote:
Originally Posted by Top banana View Post
Dai, is yours a long or extra long. mine is allso set at 2.5" above the keel pad.
and have you tried different props. Although 46knts on a 5.8 is enought to
clear any bad hangover.
No, it's 20" mid (longshaft). Have also tried a 19" Laser II, which gave better acceleration, but less top end and still only hitting 5000rpm, but that was with the motor mounted 20mm lower, so it may rev a bit more with the 19" on the current ride height - will have to give this a try. Haven't got any other props to try.

Edit:
Proper bit of thread hijacking here
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