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Posts: 349
| Motor: 2006 Suzuki DF60 Tiller
Gear Ratio: 2.42
Spec WOT RPM Range: 4700 - 5300 (this seems low, but it's what I've found for this motor)
Current Prop: Solas Amita 3 - 13.5 D x 15 P
Current WOT RPM: 5100-5200 (could get more with trimming up, but the boat starts to porpoise)
Negative 5° wedges installed - no help other than I can now trim back to 0° on plane
Originally mounted on the lowest holes, but I moved it up 2 holes and no change in porpoising. Cavitation plate is out of the water when on plane and boat handles great... No cavitation when turning.
2 batteries in the front half of the boat and my heaviest gear like the anchor is stored in the front storage compartment. I get less porpoising with passengers up front or a full tank of gas.
Performance: Good hole shot, WOT RPM are exactly in the spec and I get 30-31 mph WOT. I can trim up to the sweet spot at 3/4 throttle and cruise at 25 mph. If I trim up past 0° at WOT the boat starts to porpoise immediately until I trim back down.
My goal is to be able to trim up enough at WOT so I can get into the sweet spot and take all torque off the motor for easier steering.
Every other boat I have driven or owned, I can trim up at WOT until the prop cavitates or motor hits the RPM limit. This boat just starts to porpoise immediately.
I've considered a 13.75 D x 13 P prop but I'm hesitant to pitch down as that will most likely put me over max RPM and hurt top end speed.
I've considered a hydrofoil but my cavitation plate is well out of the water when on plane so I don't see how that would help.
Let me know if you need any other info, thanks!! | |
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