OK, my last post was just a tease to get everyone listening...#8-)
As this forum started I described my overheating
problems and we discussed the possibilities and I made some changes. The discussion continued and we ended up concerned about the propeller
after I reported that it was probably 18x18 since that is what the spare was. Turned out it was 19x18...even worse. Now will THAT cure the overheating?
You were quite right, it did. Thats the way a discussion forum is supposed to work, discuss, try, and solve.
4-108 engine with no load 600 to 4000 RPM
We are going for 3600 RPM (90%) under load.
The 19x18 prop gave 2200 RPM max
At 2000 RPM it gave 5.0 Knots and tengine temp of 200F
The 18x13 prop gives 3600 RPM max (right on the button of 90%)
At 2000 RPM it gives 5.0 knots and 170F engine temp
At 2500 RPM it gives 6.0 knots and 170F engine temp (thermostat temperature)
At 2600 RPM it gives 6.2 knots and 170F engine temp
I am predicting it will hit hull speed
(6.8 Knots) at 3000 RPM and 170F but I have not yet tried it.
In any case, I believe that I have the cleanest and most efficient cooling
system on the planet right now because I went over it with a fine toothed comb before discovering it was NOT the cooling
system that was causing the problem...#8-)
As to improved performance, I find that getting alongside at my berth which requires a bit of backing and filling is much easier and more predictable when backing. Yesterday I laid it up to the wharf single
handed and then jumped ashore to tie her, no assistance needed. Usually someone jumps ashore to keep me off the concrete but this time I laid it against the fenders without a problem.
Thanks to everyone on this Forum for all the suggestions. Its fixed!!!