here is some info from my nephew Ben G
interesting results, the decision to go with the 543 over the 541
was made due to the fact that he is a slalom skier and wakeboarder
typically with 3 fat sacs and couple of 200+ lb buddies
(it looks much better in excel)
Boat Prop Test Sheet
Boat Tuning
Idle RPM 700
Base Timing 11.0
Boat Performance
Start Air Temp 57 F / Cloudy
End Air Temp 59 F / Cloudy
Start Water Flat with a slight ripple from light wind Pics below
End Water Flat with a slight ripple from light wind Pics below
Start Fuel Level Just over 1/4 tank
End Fuel Level 1/8 tank
Weight in Boat 460 lbs (Drew , Ben, Tools)
13x13 Sandcast Prop 13x11.5 Acme Prop 543 Difference between 2 props
Run 1,Run 2,Average,Run 1,Run 2,Average,#1 vs #1, #2 vs #2,Ave Vs Ave
RPM at this speed
15mph 1720 1710 1715 1910 1920 1915 190 210 200
20mph 1960 1960 1960 2130 2150 2140 170 190 180
25mph 2260 2220 2240 2540 2540 2540 280 320 300
30mph 2640 2640 2640 2990 2970 2980 350 330 340
35mph 3150 3140 3145 3500 3510 3505 350 370 360
40mph 3800 3820 3810 4020 4070 4045 220 250 235
WOT rpm 4370 4380 4375 4530 4530 4530 160 150 155
WOT mph 44.1 43.62 43.86 43.62 43.62 43.62 -0.48 0 -0.24
In-gear > 35mph time
8.1 8.2 8.15 7.41 7.48 7.445 -0.69 -0.72 -0.705
35mph > 15mph time
6.67 6.54 6.605 6.16 6.17 6.165 -0.51 -0.37 -0.44
Test Specs
For all RPM measurements a digital Tach was used
For all static MPH measurements a GPS was used
For dynamic measurements (accleration / deceleration) analog speedometer was used. Hence the exact number is not accurate do to lag in the speedometer, but the change from prop to prop is accurate
Boat has a slight hesitation when going from idle to WOT, when the boat did not hesitate off the line with a new prop the time was 7.12 seconds
Boat was power tuned before start of test.
