# 15 Stepped Hulls

Lorne CampbellTechnical

Steps are all the rage these days in planing craft, and particularly so in the continuing development of the RIB. They were introduced at the beginning of the 1900s and … Read More

# 14 Propellers

Lorne CampbellTechnical

There is some logic behind propellers despite the ‘Black Art’ image but they are complicated devices. Lorne Campbell helps to demystify this issue. Since they are the things which move … Read More

# 13 Blueprinting

Lorne CampbellTechnical

Blueprinting is a colloquial term for bringing any piece of machinery as manufactured to its specification as designed. The term is well known when applied to engines but less understood … Read More

# 12 Trimming devices

Lorne CampbellTechnical

The fastest RIB is no use if you can’t control it.  Assuming a conservative, fairly heavy boat with its centre of gravity (CG ) not too far aft, throttle and … Read More

# 11 Porpoising

Lorne CampbellTechnical

A porpoise ‘porpoising’ looks smooth and energy efficient; a boat doesn’t and isn’t!   This action is constant, rhythmic pitching up and down of an out of trim planing craft … Read More