08-16-2005, 11:57 AM #1
Ran with new prop pitch, great results.
I got the prop back from PPG and it made a world of differance.
I belive it is a 14 1/4- 19 1/2
I still was able to pull 8100 rpm's all day long. air temp was 92 or so with water temp at 92 as well.
I saw a little heat fade today for the first time and lost 50 rpm's by the end of the day. I did remove the coolant and installed water and water wetter with no antifreeze and I belive that it hurt. I am going back to 50/50 mix with water wetter added.
Every pass was 70 mph with a few 71.5's.
Does everyone think I am about right on top speed?
It still slips out of the hole, tach jumps to 8100 drops down to 7400 or so and builds back up. I wonder if I can get rid of that or leave well enough alone?
I know I am going to try the nozzle rings and try and restrict flow a little and see if the slip goes away and maybe speed comes up?? Also the tailcone spacer.
08-16-2005, 12:02 PM #2
Good deal David!
I think if you go with a slightly smaller nozzle it will help your cavitation out of the hole. It may kill your RPM's enough to cause you to lose speed though. You never know though, you could increase in speed too. It's just something you have to play with.
I think putting a tad bit more pitch in the leading edge will get rid of the cavitaion.
08-16-2005, 12:06 PM #3
The 14- 1/4 or the 19 1/2?
Do you think the top speed is about right?
08-16-2005, 12:09 PM #4
Neither... PPG will know what to do to eliminate the cavitation from the hole.
Your speeds sound good for in the heat.
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