youngbull said...You are better off refining 1 thing Macro - finish the cat first

Work on cat is still in progress.
1. I did permanently close holes for centre boards - because at 30 km/h water was gushing like fountain through this openings

I used PVC pipe cut in half and screwed to the hulls - but there is water ingress into one hull. Good > 100 L in one 5 hour ride !! So I need to improve , turn cat upside down and completely laminate.
2. Next - above 20 km/h behind each hull quite big wave is created and water splashing, creating wash and wave. I have to find a way to create mould and make fibreglass sharp ending extension 1.0 to 1.5 m long. That should substantially reduce drag.
3.At this moment cat is going very nicely 22 km/h with 2 persons on board with 6HP Suzuki motor and fuel consumption is around 1 liter per hour.
Unfortunately I could not present the most recent trials on Google map because my smart phone was somehow damaged by this splashing water one trip. Luckily was insured and replacement should arrive soon. This time I need better waterproof case and the cheap one wasn't so good.
www.google.com/maps/d/viewer?mid=1QKkX8TwbAUY0vu_ZSG4FwDMQcWY&msa=0