Prop, slip, gears, speed calculation

[verytricky]

Once apon a time a saw a great method to calculate prop slip, speed of engine, speed in the water and hulll 'calculation number'

I would like to get these calculations.

Possibly boatmad should have a new section called 'calculations? '

[Matt]

Same link as I posted on yer other thread should cover it.

[streamlined propellers]

quicksilver produce a propslip calculator part no 90-86147A 1 and it costs about a tenner