Prop size and pitch 36 ET

[902dlw]

What is the size and pitch of the prop on 36 ET with Cummins 450hp?

[AK_Albin36]

I've been wondering the same on my Cat 450 hp single (36 ET). My survey says its a 26" diameter LH prop. I back calculated the pitch using my speed/rpm table. If its a 22 inch pitch, the slip is 0.39. Planning to check the stamp on my next haul.

Any other single screws out there who have seen their prop stamp during a haul?

Below is my performance table. 1/2 Fuel, 1/2 water, flat water, semi-dirty bottom
EvenTide Fuel Cap: 380 gal
Gear Ratio 2.063

(Sorry for the formatting... best I could do in the body of the post)

RPM____GPH___Kts___NMPG____Range(nm)
900____1.5____5____3.33_____1267
1000____2____5.5____2.75____1045
1150____2.5____6____2.40____912
1240____3____6.5 ____2.17____823
1335____3.5____7____2.00____760
1402____4_____7.5___1.88____713
1480____4.5____7.9___1.76____667 (best slow cruise - trim tabs up, ~30% load)
1550____5.4____8.2___1.52____577
1600____6_____8.5___1.42_____538
1700____7_____9_____1.29 ____489
2000____10____10____1.00 ____380
2400____16____14____0.88 ____333 (best fast cruise - trim tabs max down, ~70% load)
2550____18____15____0.83 ____317
2650____20____16____0.80 ____304
2800____23____17____0.74 ____281

[Almeister]

I have Sophie-Christine under extensive survey at the moment, she has the Cummins 450 CTA. The prop is a bronze 4 blades 26" diam with 25" pitch. If you can see the following picture...

[AK_Albin36]

My 2004 with single Cat 450 is confirmed as 26 X 22.
My top end motor rpm is 2800 rpm with a transmission gear ratio of 2.063