Seems my Yamaha 6hp 2 stroke
was actually an 8hp or close enough. Inspection
of the exhaust
revealed the washer had been removed, and the carb had a larger main jet than original specified on the 6hp.
It would propel my 2.6m air floor dinghy
to the dizzying heights of 15-17knts one up and 11-12knts two up.
I since changed to a 2.6m aluminium rib
, weighing the same as the old air floor dinghy
. On this rib
will push me along at 15knts, but will not plane at all two up.
Dropping down to an 8.5" x 6.5" prop may help a little (currently running 8.5" x 7.5"), but I'm not convinced. The aluminium rib can only carry 300kg vs 500kg of the same sized air floor dinghy, so there's a lot less buoyancy.
I'm wondering if the small additional power of the Tohatsu 9.8 2 stroke
is worth the outlay. The Yamaha 15hp would be nice, but the weight is too much. 26kg is about all I can manage moving around.