Thanks Phill, that is consistent with the school of thought that F12 should aim at somewhere around 12 y.o. and up (or perhaps a couple of younger kids). And both RG's and Scarecrow's designs with boards and a stayed mast and the possibility of trapezing seem appropriate for the slightly older group rather than the very youngest kids just starting out. However it would be helpful to get comment from both of them on whether they see things this way.