im MartinB

I'm hoping to get some people to share there Arneson setups so I can start to get an idea what size props to be shopping.
Twin engine
V-bottom 31'
Current ratio 1.32
Torq expected 900
Speed predicted 100-105
Prop diameter 17-18"
Rake 18 deg

So using this information I show a 28 pitch prop with 14% slip gets in the low 100s... Based on this I think the 1.32 ratio should be doable and no need to spend 5k having them converted to 1.56. I would greatly appreciate any help from those willing to share their existing set ups. I've found plenty of posts with what props, but without knowing the ratio it doesn't help.

green lightning

I have a 35 non-step Fountain, my engines put out around 800hp , I run a set of asd7's with a 1.32 gear ratio and in good conditions I can go 105mph . My best overall set of props are 18dia 20*rake 31pitch.

im MartinB

Thank you! That helps a lot. What rpms do you reach at the 105? Would you by chance know your cruise rpm and speed?

green lightning

When the boat reaches 105 I am turning about 5500 rpm . I don't pay much attention to my cruse speed and rpm but the info is in my prop testing log book and i can take a look , what do you consider your cruse speed to be ?

im MartinB

Usually cruise about 3500 rpm.

green lightning

Depending on how the trim is set but usually at 3500rpm i am traveling about 68 to 70 mph

glassdave

rake is everything with Arnesons, eighteen degrees minimum. Big diameter and more blades after that.