@johnny44 I exhausted every other possibility. I had just been waiting for the opportunity to pull the boat into shallow water to do the swap. Finally got it yesterday.
No response yet from Hill but I just emailed them last night so not expecting to hear back immediately. In the meantime I will try to measure the pitch myself.
Well, they replied promptly and said this has never happened before and asked me to ship the props back. They said they would send a prepaid label but I haven’t received one yet.
I think I will have them analyzed by a prop shop before I send them. It would be nice to know from an impartial source what the issue is (pitch or cupping or…?).
Here’s my experience 18p vs 20p on the 2008+ 350/360 with 6.2L / 377 and Bravo 3. Same day same weather conditions. Boat was probably 200 pounds lighter (fuel burn) with the 18p.
Note that I have about 1000lbs of dinghy + hardware on my platform and therefore I needed the extra push of 18p. Without the dinghy 20p is perfect for the 350/360 in my opinion.
20p @ 28mph
18p @ 28mph
So +250 rpm to maintain same speed. Exact same fuel burn despite higher rpm. I don’t love having to run at higher rpm but the boat planes wayyyyyyy quicker now. There are a lot of areas where I have to come off plane and then pop back on plane again so this is good for me.
I've done a bit of reading regarding mixing pitches on Bravo 3. I think I will do one more test (if the weather permits) and put the 20p on the rear (stern side) and leave the 18p on the front (bow side).
I've done a bit of reading regarding mixing pitches on Bravo 3. I think I will do one more test (if the weather permits) and put the 20p on the rear (stern side) and leave the 18p on the front (bow side).
Comments
Will report on the difference between the 20p and the 18p on my 350EC.
20p @ 28mph
18p @ 28mph