All, check this out...a propeller slip calculator for the iPhone and iPad....
http://itunes.apple.com/us/app/prope...459768648?mt=8

I have the Hering calculator for Android. It's free Neat Apps a becoming more and more available.
http://www.androidsoftware.us/Applic...alculator.html

Just tried a search on my iphone and not finding it.

You should just have to click the link that I posted... Not sure why it's not coming up... Works for me...

I searched for "propeller slip" in the App store and found it, works great.

Livorsi prop slip gauge works even better

X2 but the app is nice for when you just want to play with the numbers!

Purchased!

Quick couple questions though.....

1. how come none of these calculators you see on the Internet or this one take into consideration a twin vs. single setup? Wouldn't the top speed be different if you have a twin setup?

2. Along the same lines wouldn't it be important to know how many blades your running on the prop? Correct me if I am wrong but in the real world if you kept all the numbers the same (speed, pitch, WOT RPM, gear ratio and simply changed from a three blade to a four blade I don't believe the boat will run the same speed??

Thanks

Agreed... But for .99 cents... I'll take the app lol.

Good points however, single versus twin setups, the main goal is to make your prop as efficient as possible. The calculation gives you the options to manipulate the "what if's". I agree that there is more to it... IE hull condition, cat vs. Deep v, stepped v vs. Conventional, ect...