Prop Formula

[dave h]

WHAT IS THE PROP FORUMLA FOR FIGURING SPEED ?

DAVE

[rob vaughn]

I can tell you but just go here......Prop Calculator (www.rbbi.com/folders/prop/propcalc.htm)

Most put in 10% for slip, but I say 15% at least.

[Raceman]

10% has always worked out to a pretty good average for me. I've seen a few (very few) down around 8 and a few about 12 or so, but haven't had any as high as 15 yet.

[dave h]

HOW DO YOU KNOW WHERE YOU ARE AT ?

I JUST SPUN MY ALLISON XR2002 575LBS WITH A 98 2.5 WITH A 24P HOSS AT 9100RPM. I WENT TO THAT PROP CAL. AND IT SAID LIKE 98.5 MPH MY GPS SAID 103.2 MPH SO WHAT DO YOU THINK ?????????


DAVE

[Raceman]

Sounds like your prop slip is down around 7% or so, instead of 10. I'd think that's believable.

[rob vaughn]

I'll tell everyone, in the classified ad, that RACEMAN, says the top speed of this, to be 38.7 MPH. :D :D

It will pull a 210lbs. person up, on two ski's.....