Running dry

[noisemaker]

I can't find it but there was a ratio for running dry i was gonna show a friend.. but here is my new build

 

[noisemaker]

Pics won't load

 

[kwanjangnihm]

The formula never changes. 6lbs per available hp. This assumes about 3.5 to 4lbs of thrust per hp from the prop.

Ultimately you want a thrust to weight ration of around 0.5 or better. The higher that ratio the less often you get off to shake the rake.

 

[terrible ted]

The formula never changes. 6lbs per available hp. This assumes about 3.5 to 4lbs of thrust per hp from the prop.

Ultimately you want a thrust to weight ration of around 0.5 or better. The higher that ratio the less often you get off to shake the rake.

Where or how do you calculate your thrust?

 

[Slidin Gator]

Where or how do you calculate your thrust?

This assumes about 3.5 to 4lbs of thrust per hp from the prop.

The 4 lbs per Hp figure is where 1,200 lbs from a 300 Hp angle valve 540 comes from. That is really under optimum conditions, like without a boat and cage in front of it. 3.5 lbs/Hp is more realistic

 

[terrible ted]

Well motor builder estimates 350 @ 3200 am pushing 3 without a gear box, really a total rebuild to replace \crank and add gear