Radio course inside the Solent as the winds were light and needed to get into Yarmouth before it filled up. Big fleet start so a bit crowded at the pin end but managed to squeeze through and got the kite up down to the Hill Head. Beat back up the Solent and started OK but quickly seemed to slow with the rest of the fleet going past us. Tried a few things but couldn't get the boat to go but no joy and ended up finishing behind all the Impalas. Checked the folding prop and that seemed to be OK but a bit later whilst moored up a big lump of weed appeared from under the boat so perhaps that was stuck round the keel slowing us down.