Jack plate and prop testing

Quote:

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Originally Posted by Baker343

Let me back up. Check the last 3ft of running surface to make sure your hull doesn't have a hook

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I'll check it again but when I used a long straightedge to measure the prop to pad it looked good.

Have you done a black box delete? Oil injection delete? If not do both

Oil injection delete is done. I do not think this gen XR6 can have a black box delete like the earlier ones; the only black box on the motor is for the ignition system.

So as an update there will be more testing tomorrow:
- I am going to try the same Trophy Plus 25P at 3.25" prop-to-pad which is as low as the jackplate will go without remounting the engine. That's lower than the lowest from the first round of testing.
- Then I am going to switch to a practically brand-new Tempest Plus 24P I just scored and incrementally raise the jackplate from there.
- Test conditions will be close to the same as before. Lake, temperature, wind, boat load.

Then I'll come home and crunch the data, think about it, pick the prop, and sell off either the Trophy or the Tempest. Again I already have a 21P Trophy+ for slower and heavier work; this testing is for the go-fast, fishing-solo prop.

Well... That prop test did not happen today. A testing trip with two ended up being a fun trip for four so I reinstalled the 21P Trophy+ and we cruised and tubed around on that all day.

What I did confirm is that with four adults in the boat, 30 gallons of gas, and miscellaneous gear that the 21P Trophy+ will definitely work as the heavy load all-purpose prop. It topped out at 50 MPH (gps) at 5800 rpm with four in the boat, and at 45 mph with three in the boat and one being towed on the tube.

Again this XR6 is set up by Mercury not to run above 5800 rpm so I believe that 50 mph wall was an rpm limitation and not a drag limitation; in other words, 21P was not too much prop. With a light load it would be too little (but I knew that already).

I'll report back when I complete testing with the other two props.