The Dinghy Derrick has been extensively tested on our rigs using both Zodiac and Avon GRP RIBs with double floors. We water ballast the compartment between the floors, and add a 4 to 6 HP 4-stroke motor.
A typical analysis of this load is:
Zodiac Cadet RIB 290 Neo 65 kgs -or- Avon Rover RIB 280 61 kgs
Yamaha 4/6 HP wet weight 28 kgs -or- Mariner 4HP 27 kgs
Water ballasting at 50% of total void of 78 litre 39 kgs
Total test load 130 kgs/ 286 Lbs
ARK Marine Ltd. certify the maximum service load to be 130 kgs (286 Lbs) excluding the weight of the Derrick itself of 44 Kgs.(97 Lbs)
The installation kit carries strain gauge readings from the test rig to assist the fitter.