New prop less rpm

[crow]

I had to change props I got a different brand same pitch and diameter but lost around 1000 rpms but speed is the same what causes this and is it a good or bad thing

[bigbluechevy454]

One or the other wasn't reading the pitch in the same spots some read the middle of the blade some read leading edge etc

[Hoss Marine Propellers]

Something is definitely off between the two propellers???
Too drop 1000 rpm & still run the same speed with supposedly the same pitch/dia. is way off!
The pitch would have to be considerably different for that to happen.
Any chance the tachometer messed up at the same time?

[staylor]

I could understand a 200-300 rpm difference if the two props were very different designs from different firms- but a 1000 rpm change could be the tach- as Tim posts- or it could be that someone just stamped the wrong pitch on it. I had a similar issue once with 2 Merc Props that were stamped 11 pitch for a 25 hp. One ran much lower rpm; I had a prop shop check it and found it was a 14.
Doug

[south599]

is there a chance that you went from one brand where the blades were say 13 1/2 long. to the new one thats say 14 1/2in long? any change in if you went from a 3 blade to a 4 blade.

[toyomirage02]

and no it will not be a good idea to bog ur motor that much either,