Feilding page 4

Pontoon Crane

Brian Jones, Wellington with his Pontoon Crane. This is a variation of Super Model Leaflet Number 28. These cranes floated on "pontoons" and were moved around a harbour or dock to where they were needed.

Another Super Model Leaflet Model: Stiff Leg Derrik, Number 6 by Bruce Geange. The original model used an electric motor, but here Bruce has used his replica Meccano vertical steam engine.

Stiff Leg Derrik Crane

Construction Crane

Construction Crane, by Simon Moody, Wellington. The tower was 7 feet tall with a 7 feet long jib. Level luffing was accomplished using the Topliss System. The jib was raised and lowered by imitation hydraulic rams, cylinders of which were made from part 216 cylinders joined by bolts and couplings on the inside acting as captive nuts. 6mm screwed rod pushed out 3/8" brass rod so that the threaded section could not be seen.

On this type of crane a wire rope comes off the jib a short way up and this pulls a tail weight out under the crane as the jib is lowered to a greater radius. In Simon's model this was reproduced but it also stretched 5 large springs concealed in the body of the crane to counteract the load of the jib on the rams. The tail weight was a large mass of lead that balanced the jib.

Simon also makes replica parts which you can view a list of at the ISM site.