Thank you for accepting me into this superb forum!
I recently purchased a beneteau antares 8.80 with the df300 fitted, my first outboard boat!
When I picked it up I was very disappointed with the performance, I’d struggle to get 25kts at wot, it would only rev to 5500rpm and fuel burn was terrible!
I have taken advice but cannot get a definitive answer to my question of what is the correct prop for this setup. The engine was mounted too low, this has been put up about an inch and it’s correct now. Now down to the prop, I took off the original 15 1/4 x 19 and replaced it with a 16 x 17. The revs rose to 5650 and the speed to 33kts, was pretty pleased with this but have been advised that these engines need to rev so we have changed it to a 15 1/2 x 17. Instantly the revs have gone up to 6200 which I think is correct based upon suzuki information but the speed has dropped to 30kts.
This confused me a little, I understand the diameter being reduced has made it lose a bit of speed but I’d have thought the extra rpm would have overcome this.
So my question is what should I use, what would be the best prop for general cruising, would the 16 diameter prop be more economical at 22kts or would it be labouring? Is the engine going to be better on fuel revving a bit higher but under less load with the 15 1/2 prop.
Should I be trying a different prop?
Any advice is more than welcome and thanks for a fantastic forum!
Regards
Stuart
I recently purchased a beneteau antares 8.80 with the df300 fitted, my first outboard boat!
When I picked it up I was very disappointed with the performance, I’d struggle to get 25kts at wot, it would only rev to 5500rpm and fuel burn was terrible!
I have taken advice but cannot get a definitive answer to my question of what is the correct prop for this setup. The engine was mounted too low, this has been put up about an inch and it’s correct now. Now down to the prop, I took off the original 15 1/4 x 19 and replaced it with a 16 x 17. The revs rose to 5650 and the speed to 33kts, was pretty pleased with this but have been advised that these engines need to rev so we have changed it to a 15 1/2 x 17. Instantly the revs have gone up to 6200 which I think is correct based upon suzuki information but the speed has dropped to 30kts.
This confused me a little, I understand the diameter being reduced has made it lose a bit of speed but I’d have thought the extra rpm would have overcome this.
So my question is what should I use, what would be the best prop for general cruising, would the 16 diameter prop be more economical at 22kts or would it be labouring? Is the engine going to be better on fuel revving a bit higher but under less load with the 15 1/2 prop.
Should I be trying a different prop?
Any advice is more than welcome and thanks for a fantastic forum!
Regards
Stuart
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