44xs rpm

[topomichracer140m]

What should a 44 be running for rpm?

[Yellowjacket]

Here is the power curve for a properly built 44xs according to Mike Wienandt. The full report on this test is in this thread here on Hydroracer….. The full report is linked to in that thread in the first post.

https://hydroracer.net/forums/forum/main/technical-discussion/4241-tohatsu-50d2-merc-44xs-dyno-data

Bottom line is that power is falling fast over 7000 rpm and you're pretty much done by 7200. The only reason you may want to turn it faster is to use a prop with lower pitch so you get off the corners faster, but you're going to run out of breath on the high end so there are limits as to how low you can go. You don't want too tall a prop because the south end of the power curve is around 6000 rpm, and if you come off the corner too low in rpm you won't have good acceleration coming off the corner.

[topomichracer140m]

Thank you!

[pearson95m]

Dear topomichracer140m,
Run it around 2500... I think that's a good number to hit for you.

[topomichracer140m]

Lol....Gee...thanks Junior!

[pearson95m]

From what I understand, that is the preferred rpm to distract 🦌 from running out onto the course... just sayin

[topomichracer140m]

Ya gotta watch those critters at Top O!