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Old 04 September 2012, 09:47   #31
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Watching this thread with interest
You and me both
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Old 05 September 2012, 02:01   #32
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340 Airdeck 20hp Merc 4 stroke, 9.25 10p (std) 2 large adults, 18 L fuel, fair amount of gear - 37 km/hr.

Just got induction tach so WOT / pitch games can begin. May also try raising motor (want 40km just cause).
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Old 05 September 2012, 03:11   #33
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any idea how fast a merc 7.5 2 stroke on a 3metre SIB would go? inflatable hull
My 2.85m Zodiac SIB would do 14-15 mph with a Mariner 6hp 4 stroke on it, with two of us on board plus some gear. So I would imagine yours will do 16-18mph with a 7.5hp
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Old 07 September 2012, 12:24   #34
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just taken my newly acquired merc 7.5hp 2 stroke out for first time today, 19mph WOT on a 3 metre hulled SIB
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Old 07 September 2012, 19:28   #35
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3.6m Avon Rib, 30hp Yamaha. Two guys, 23L fuel and light gear. 32mph
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Old 11 September 2012, 09:34   #36
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Ash,

What prop are you using. I have the same set up (with exception of brand outboard 15hp Johnson) and I consistently get 21mph on gps and just once hit 22. If I am short changing myself at prop, it might be worth the price of admission. Is the 25 more or less consistent or a one time thing. I'd hate to think my Johnson is that weak (pun not intended, lol). I know those last few MPH are difficult.
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Old 11 September 2012, 21:19   #37
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Originally Posted by lineofsight View Post
340 Airdeck 20hp Merc 4 stroke, 9.25 10p (std) 2 large adults, 18 L fuel, fair amount of gear - 37 km/hr.

Just got induction tach so WOT / pitch games can begin. May also try raising motor (want 40km just cause).
Here is a hint for induction tachs - before leave home take them apart and seal them properly... was non-functional for this attempt.

However, on the water boat + motor + 300 pounds passenger & gear saw 41.5 km/hr. Max speed on GPS once home shows 45km/hr but it may not have turned off before being put away thus could have picked up speed on way home. So this means just have to try again Can say got a little bouncy above 40... good fun.
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Old 11 September 2012, 21:32   #38
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Aquarius Mini-Cat 11'6 stock 2011 25hp tohatsu four stroke short shaft 35mph



Aquarius Aqua-Cat 13'3 stock 2011 tohatsu 50hp long shaft 51mph

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Old 12 September 2012, 08:23   #39
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Mk3 Futura 30Hp 2 Stroke - 32mph
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Old 12 September 2012, 08:30   #40
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3.1 Zodiac, hard floor, 1 adult +35l fuel

8hp gave a steady 20 mph. on GPS
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