Johnson 70hp VRO has now 13x21 Solas Amita 3 aluminum prop.
Boat is Argo 17 race boat, this combination is capable to +/-50kn. (with cleaver etc.)
Solas says that this prop has wide blade design ment especially for 4-stroke engines.
Johnson revs 5600 wot and takes 39kn, with wife an kid in boat.
Now, considering more top speed, I have an opportunity to buy a 13.25x23",OMC Renegade for reasonable good price. However 4th blade and 2" gain in pitch makes me wonder... Is it too much?
I have a jack plate and there's fairly much to lift engine more. I think Renegade would work much better lifted than Amita.
But how this "wide blade design" alu compares to 4-blade steel?
Is it worth to try or do I see revs drop under 5000?
Opinions are welcome.
Boat is Argo 17 race boat, this combination is capable to +/-50kn. (with cleaver etc.)
Solas says that this prop has wide blade design ment especially for 4-stroke engines.
Johnson revs 5600 wot and takes 39kn, with wife an kid in boat.
Now, considering more top speed, I have an opportunity to buy a 13.25x23",OMC Renegade for reasonable good price. However 4th blade and 2" gain in pitch makes me wonder... Is it too much?
I have a jack plate and there's fairly much to lift engine more. I think Renegade would work much better lifted than Amita.
But how this "wide blade design" alu compares to 4-blade steel?
Is it worth to try or do I see revs drop under 5000?
Opinions are welcome.