Hamish thanks for the tip on the Ballards transformer on ebay i now only need to pick it up.
I now have one converted trainset transformer good for one plane on a 2 meter line.
i have one variable transformer good for one plane on up to 4 meter line.
i have one ballards transformer good for two planes on 4 meter lines or one on a 5 meter line.
2 poles 1 single and 1 twin, enough flying wire for all, 8 motors 5 sets of plans and enough balsa to build 5 planes.
Just add kids and wait for the havoc to begin.