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Ok, a brief trail report for you....
5.4m Searider with Mariner 75hp 2 stroke
Max Rpm: 5600
Max Speed:35.9knts
Load 2 people plus 50ltr fuel
Prop: 18" Vengeance
5.4m Searider with Mariner 90hp 2 Stroke
Max RPM: 5400
Max Speed: 38.2knts
Load: 2 people plus 50ltr of fuel
Prop: 20" Laser 2
5.4m Searider With Mariner 75hp Optimax
Max RPM: 5500
Max Speed: 33.7
Load: 2 Plus 50ltr fuel
Prop: 18" Vengeance
75hp Optimax lifted up one hole on Transom
Max RPM: 5600
Max Speed: 34.7knts
Load 2 Plus 50ltrs fuel.
Prop: 18" Vengeance
We did try a huge amount of different props but these are the best results out of each prop trial. We never tried the 115 Opti as it was not needed. Annoyingly i cant find the 90opti results!. We also tested engine with various weights from 200kg upto 600kg.
Also worth a note the Dyno results for the above engines.
Mariner 75hp 2 stroke Dyno run @ 81.2hp
Mariner 90hp 2 stroke Dyno run @ 94.2hp
Mariner 75hp Optimax Dyno run @ 74.8hp
Mariner 90hp Optimax Dyno run @ 90.0hp
We also found that every boat is different!, and some are faster than others. We had a 5.4 Searider here a while ago with a 90hp 2 stroke on that on a good day would top 40knts.
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