RE: RC multihulls?
The only german production multihull, the 'Butterfly' of GRAUPNER - and a bit smaller than 48 inches - was the only production trimaran made of ABS, with alloy crossbars - weight 3,3 kg ready-to-sail ->
Unfortunately the floats where too slim and the A-rigg sailarea was only 0,5m2, instead of 0,9m2!
-> and it had such a mast buoyancy made of ABS - 16 x 4 cm!
I have checked the german net, but I didn't find a single pic of the boat with that 'thing' installed on the mast top!
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Maybe if you do a search with google -> pictures -> butterfly -> trimaran -...- or something like that!
PS:
I just read in the 'other' forum,
even William Hojnacki, who had four 'Nightmares', and by now sold all of them again, liked the performance of my boats a lot!
He just din't find anybody else, who DARED to sail these boats - and he didn't like to sail alone!!!