F18 = 180kg min boat weight. ( have no problem moving my Tiger about but some people bitch about it). F18 is the fastest growing cat class in the world and is a ton of fun. I was sailing my Tiger for a while single handed last Saturday and had no dramas. Went like stink and felt very lively. Dunno about righting it solo. If you can get a TheMightyHobie18 upright then the Tiger/F18 should be similar.
F18s can be righted solo given enough wind (12k+). I single hand mine occasinally but I do usually carry a righting bag just in case. The boat behaves so differently with so little weight on it - it's quite a thrill. I have righted it twice solo and twice with the crew still on the high hull (their weight initially works against the righting effort up there). I weight 175lbs.