hi hadley and all prop suggestion

[Benny1963]

1978 wahler style mckee 17ft
1983/1985/ crossflow 175 runnin57 mph with sst1 21 p at 5800 still got a little left no limit packs waterpressure good .
have now rasied two bolt holes water pressure still good with top hole filled .
runnin same 21p sst 1 very thin by the way ,58 mph at 6200 with a little left
shoul i go up in pitch or change design to turbo or raker any suggestions
by the way im not runnin 6200 but for a second to see what its pullin im keeping it at 5800 they say the harmonics on the crossflow doesnt like 6200 to 6400 above they say they will stay together but i wont chance it i have a
motor project underway 2,0 liter merc and xp motor as well thanks

 

[Benny1963]

Re: hi hadley and all prop suggestion

come on guys should i go up in pitch.
or should i run a really aggresive 21 with my new motor hight
my prop now is thin im just wondering if a new prop with some cup left in it
with same pitch will kill off some of what ive gained about 400 rpm by jacking up

 

[Randybeall]

Re: hi hadley and all prop suggestion

You say your 21 sst is very thin? What exactly do you mean by that, is it reworked to death? A new prop exactly the same might get more bite and get what you want. My answer would be yes, go for increased pitch. You have done the right adjustments and are now over what you should be in engine speed. Should give you even more top speed, as if it is necessary. Remember, water is very unforgiving at high speed when something goes wrong.