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Old 12 May 2015, 08:15   #11
Locozodiac's Avatar
Country: Other
Town: Lima-Peru
Boat name: Nautile
Make: Sea Rider Boats
Length: 4m +
Engine: Tohatsu 18 /30 HP
Join Date: Sep 2007
Posts: 1,706
Factory engines with delivered props gives very good performance on light to medium light applications, usually at near full wot factory stated rpm. Install the induction tach, go for a wot spin you alone with lightly loaded boat on ideal flat calm, no wind water cond. and check achieved max wot rpm, compare them to engine's factory wot parameters to check if inside safe ones.

That engine revs 5-6K rpm, check if in that range, can play with prop pitch to be at or very near 6K. One -, + prop pitch is around 150-200 rpm difference,

Happy Boating

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Old 23 May 2015, 15:02   #12
tuskar's Avatar
Country: Ireland
Town: Waesfjord
Make: Excel sd 2.9
Length: under 3m
Engine: Mariner 8hp 2S 1986
Join Date: Nov 2014
Posts: 56
Hi folks,
Got the tach meter during the week and got out on the river today for a run myself and a passanger 14st each .The engine clocked 6400 rpm. ie with the 8 ' pitch prop. So am I correct in calculating an 11 or even 12' prop would be suitable ? The recommended rpm is 5500rpm

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