Logo
Prev
search
Print
Rotate
Help
Bookmark
Contact
Next
Contents
All Pages
Browse Issues
Home
'
Boating NZ : FREE TO READ March 2014
Contents
performance of planing powerboats. The fundamentals of his original work have not changed and now form the basis of a range of performance prediction software. The key variables available to the designer are deadrise angle – the amount of vee in the bottom, beam at the chines and LCG position. Plugging these into the software will output the required horsepower for a given speed, the running trim at that speed and whether the boat demonstrates dynamic instability in pitch – known as porpoising – and a few other useful numbers. Savitsky’s method was based on a prismatic form; ie, constant deadrise along the length. While adjustments can be made for varying deadwise, warp and thrustline, for simplicity this discussion will assume constant deadrise. But why do we need deadrise? For three main reasons: if we had only flat-bottomed boats, every wave encountered at speed would be a tooth-rattling back breaker, and the boat would run flat, at low trim angle, A good understanding of your boat's trim assists in a more comfortable ride and economical running. replace your existing Bearing with henleys propellers & marine ltd email: enquiries@henleyspropellers.com WeB: www.henleyspropellers.com thordon sxl from 25mm to 10 metre bearings for marine & industrial applications availaBle from new zealand 0314-4 50 Boating New Zealand March 2014 Feature__future concepts_March14.indd 50 19/02/2014 3:11:50 p.m.
Links
Archive
FREE TO READ April 2014
FREE TO READ February 2014
Navigation
Previous Page
Next Page
