cant work out how to delete a dupicated post ?

cant work out how to delete a duplicated post ??

I just erase and write duplicate post. Now, to your prop. You need the pitch and diameter of what you are running. Mainly pitch. It is gonna be in the 19 to 23 range. Around 20 inches, 2 inches of pitch will raise or lower full throttle rpm by roughly 10%. So if you are running a 23 and getting 4800, a 21 would increase rpm by nearly 500.

wow thanks, thats EXACTLY what i needed to know. i am out there in two weeks so can then understand where i am going with it.
my i am 4800 when i need to be 5300 so about 10% off.
what happens if i am not 20" but bigger.
whats that effect ?

It is still very close. At 30 inches of pitch, 2 inches will be 6.66 percent. At 15 inch pitch, 2 inches will be about 13 percent.

ok brilliant thanks. i have something to play with now. i will be down in spain soon ans can start with looking at whats on it