Benchmarking the 20 footer

[FishStretcher]

I hope to test the 20 footer with a 13.25 x 15 plus hydroshield, then without, then with no hydroshield and a 13 x 17. Will report back. Yamaha F100 power. Non ethanol gas. No tabs, no T-top. I know the first setup is 28 knots or 33MPH. Awesome hole shot and planing. I know the 13 x 17 is no faster and poor hole shot with the hydroshield.

[McGillicuddy]

Fishstretcher, make sure you note the prop make and model. As you know the different shapes do different things. Are you using one of the Solas props now?

[FishStretcher]

Yeah. Amita 4 for both. Aluminum.

I did hold plane at under 10 knots (9.5)with the hydroshield and 13.25 x 15 prop. 31MPH with two guys and full tank. 5800 RPM

[FishStretcher]

I haven't had a chance to benchmark it yet- some family stuff in the way. But I did verify 5.0 nmpg/5.7mpg for island trips in buzzards bay. 19-20 knot cruise at 4500 RPM, pretty much exclusively. 2 guys, and a few hundred lb of gear on board. That was a 70 mile average. Of which, 12 nautical miles are at headway speed.

[FishStretcher]

Ha. Singlehanded gets worse mileage. 61 nautical miles and 13.2 gallons. That's about 4.6 nautical miles per gallon. With a little umbrella rig trolling and hammering into a crappy buzzards bay quartering chop at slightly slower cruise like 17-18 knots. That might explain it.

[eggsuckindog]

Be sure you have the motor set high enough and your not dragging the foil - if its the correct height it will plane at lower speeds as well - with an Alum prop prolly 1" above the hull bottom at the cav plate

[FishStretcher]

Originally Posted by eggsuckindog

Be sure you have the motor set high enough and your not dragging the foil - if its the correct height it will plane at lower speeds as well - with an Alum prop prolly 1" above the hull bottom at the cav plate

It is a hydroshield- Fr. Frank turned me on to them. It is under the prop, so it is first in the water and last out. But the anti-ventilation plate is up out of the water on a hard plane, I think.

I don't know of anyone planing at below 10 knots? At least when i trim right. I think I am doing well?

At 80% trim up, I blow out and hit between 5900 and redline. At 50% trim, I hit 5800 RPM. At 20% (80% down), I am at 5700, so I think I am pretty good. Redline is 6000.

It looks like I am at 9-10.5% slip at WOT slogging the hydroshield thru the water. 28.0 knots on a 13.25 x 15P 4 blade. Assuming it is 15" pitch on the nose...

I never got to try pulling the hydroshield. Maybe later this year.

[eggsuckindog]

Sounds pretty good overall, 10 knots is dreaming your right - try and figure out what you have