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Post by gnrphil on Sept 1, 2021 10:46:41 GMT -6
I just repowered with a Suzuki DF250 and took a wild ass guess with a 19 pitch prop, motor is mounted too low so will need to be raised.
Figured I'd post up performance numbers to document the changes, maybe it will help someone in the future.
Motor in top hole (all the way down)
14x19 watergrip prop
41.6 MPH @ 6200 RPM (still have some throttle left but didn't want to over rev).
Trying a 21 pitch this weekend.
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Post by gnrphil on Sept 7, 2021 11:09:29 GMT -6
So no change in motor height,
15X21 watergrip prop
45.7 MPH @ 6200 RPM.
We're on the right path, gonna raise the motor two holes this week.
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Post by Juan on Sept 7, 2021 13:02:51 GMT -6
That's faster than me.  What's the max recommended rpm at WOT? I thought it was 6,000. |
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Post by gnrphil on Sept 7, 2021 13:22:49 GMT -6
It's 6100 but hard to tell with the analogue tech as it's incremented every 200, should've got the fancy digital tach  |
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Post by gnrphil on Sept 13, 2021 10:09:46 GMT -6
Raised the motor two holes
15X21 Watergrip prop
40 Mph @6200 Rpm
Motor still looks a tab low
Gone backwards here which I suspect is prop cavitation, Gonna try a 16X23 prop next.
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Post by freezerfiller on Sept 14, 2021 10:07:55 GMT -6
Any fuel economy numbers? I think I'd drop it a hole and retest before I went with another prop...
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Post by gnrphil on Sept 14, 2021 13:11:07 GMT -6
Any fuel economy numbers? I think I'd drop it a hole and retest before I went with another prop... Around 10 GPH before, around 12 GPH now. Spoke to Ken at Prop Gods, He suggested a larger diameter 21 pitch so going with that, the motor is still too low. |
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Post by gnrphil on Sept 19, 2021 11:23:27 GMT -6
Solas Rubex L3 Plus 15 3/4 x 21,
45 Mph @ 6200 Rpm,
9-10 Gph @ 4200 Rpm 30 Mph cruise.
Going back in the right direction, The Suzuki doesn't like the smaller diameter props.
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Post by freezerfiller on Sept 19, 2021 16:45:16 GMT -6
Nice.
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Post by gnrphil on Oct 17, 2021 19:31:38 GMT -6
Raised the motor up another hole, AV plate is now where it should be.
16X21.5 Suzuki prop
46.6 Mph @ 6000 Rpm
32 Mph @ 4000Rpm 10 GPH cruise speed.
Happy with that.
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Post by Juan on Oct 18, 2021 6:43:11 GMT -6
Looks like good numbers to me.  It took me a while to get used to the look of the bigger Suzuki props. Mine is only 16 x 18.5 and I thought that was big.  |
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Post by gnrphil on Oct 18, 2021 8:30:41 GMT -6
Looks like good numbers to me. It took me a while to get used to the look of the bigger Suzuki props. Mine is only 16 x 18.5 and I thought that was big. Yeah was looking at it yesterday and thought of you, years ago we were discussing props and you quoted a song "big wheels keep on turning". |
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Post by freezerfiller on Nov 21, 2021 16:58:13 GMT -6
Nice. 3.2 mpg is pretty sweet
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Post by gnrphil on May 24, 2022 7:21:49 GMT -6
Quick update here, last time out I managed 49.5 Mph @6100 Rpm with 3/4 tank of fuel running with the current. |
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It took me a while to get used to the look of the bigger Suzuki props. Mine is only 16 x 18.5 and I thought that was big. 