The Hook would be your problem. Get a "yardstick" or suitable 3' or so straight edge and get under the boat with one end of the stick at the rear edge of the transom and the other parallel to the keel pointed forward. The Hook will easily show up as a gap like in the Hook picture.
If that...
Like other props from other suppliers, like a couple of Mercury Laser (I and II) the ports are there to allow air (engine exhaust) bubbles to flow across the blades reducing the density of the medium allowing the engine to rev. faster like would happen with a shallow pitched prop.
Once up and...
I think blade numbers and diameter would be a constant for a comparison...in short, you have a rig that has a certain engine that uses a certain range of diameters......small range and diameter change is a function of the prop design....the more "Rake" on the blades, the smaller (slightly) the...
I had both the Mercury 2 stroke 90 HP (I3) and 115 HP...both the I6 and the I4 versions manufactured later with loop charging. They share the same mid section and lower unit. The gear ratio on the 90 is 2.33:1 while the 115 is 2.0:1. Remembering a Merc. sales brochure back in the 1990's when...
Charts exist showing the HP penalty as a function of altitude. 5k' is getting on up there and you may have half as much HP as you (and most of us) would have/do have at sea level. I'd say you would be looking at a significant reduction in pitch for desired performance.
Prop shops will loan...
I use Go-Fast.com slip calculator. It has a zero slip column and then using the inputs to the chart, with your actual speed vs zero slip speed, you get your % of slip. Big heavy loads slip a lot as do cruising speeds where a lot of the boat is in the water.
Easy planing boats with the right...
I used to run my tower of power high in the water with the prop partially out of the water as I could hear the blades beating the water making a humming noise.....as you mentioned I too developed a leak in the water jacket cover and never thought about it was due to running like I was. Live and...
Nobody (as I could tell) mentioned trim tabs. Your comment about people sitting in stern seats....aka adjacent to the engine just magnifies your stern heavy condition. Next the load you are wanting to carry in that boat is a lot......a lot more than I would expect to have in that boat.
Next...
Looks like a Wren. I had one (apparently) that decided to make a seasonal home in my shop. Been about 5 years now. A very busy bird when she has babies in the nest. She has a beautiful voice. This years 3 hatchlings have just left the area on their own. Spiders have all but...
Is water moving out from behind the engine when you apply throttle?
No, then prop isn't being driven as suggested above or engine isn't shifting into F gear like you are telling it.
Yes, 15" lower unit on a 20" transom would be a problem. Need new water in front of the prop to get propulsion...
My family grew up with larger boats too. Got to the point where it was too large on land and too small on the water. Finally quit searching for the ultimate solution to both conditions.
Well sir, that depends on the boat and what's in it. I had an 18' alum. bass boat with a 90 Merc. and SS Ballistic 24P prop., 1 hole up off the transom. The picture in my Avatar is that boat kissing 50 with just me. My fastest hole shot was with the engine at 90* to the hull. Hole shot was...
With all that said, correct trim position IS definitely a BIG part of how a prop (any prop) performs on your boat!!!!! There is a correct position for your hole shot with your water toys, and a totally different position for you wanting to get max speed out of your rig......regardless of the...
