Good morning Gregory,
The red and black boat is a Karelson "low profile" hull (notre dam) Gary Finlay plans to 1/8 scale, approx 44 inches long. It was originally built to be electric, but having messed about with some brushless motors and lipos i decided they werent for me .Being on a limited budget the engine came from my collection of glow engines. the engine is an old but brand new HB 61 PDP Stamo helicopter engine, I stripped it down , polished all the cases, replaced the original perry carb with a slightly bigger bore asp carb , crossed drilled the head to accept to alloy tubes which were then threaded to accept 5mm brass nipples, The engine was run with a 11inch aero prop and turns approx 13500 rpm, im hoping this will be enough to at least get the boat on plane but i dont know, i would think it produces about 1.5 hp. the boat weighs 10 lbs . It has yet to see water! I am hoping one of the older members here could suggest a starting point for a propellor size, the engine has a rear shaft on which i mounted a small fan from an old hirobo helicopter engine. we will see!
The blue boat is the "o boy oberto hull " again from Gary Finlay plans, it is again to 1/8 scale , approx 44 inches , weighs 12 lbs, has very interesting sponsons, which caused me some headaches, it is powered by an old , but completed rebuilt os 65 vrm engine , should be interesting !has approx 3 hp, i have yet to decide on an exhaust system , as i dont really want a huge tuned pipe hanging out the back.
The unfinished boat is a reworking of the Gary Finlay plans of the Ted Jones classic roundnose. I had always like the look of the dropped sponson boats , i reworked the plans to show open , dropped sponsons, it is to 1/6 scale , being some 56 inches long by 24 inch beam,it has a lot of stainless steel on it , the cowl front panel , transom etc and seems like a monster!It will have mahogony and red cedar planked decks, I think it will weigh approx 22 lbs finished, which at the moment is a concern to me! As yet I have not decided what engine it will have ,I have another two brand new HB61 stamo helicopter engines which I am considering making into a twin inline , overdriving them by 1.5 times , on the other hand it may have a sthill chaisaw engine! I dont know
This is new territory for me, It is some 40 something years since I built model boats , how things have changed. My experience in the past was old "merco 61" "webras" and "ED" engines! Now everybody seems to have huge amounts of power , and the engines all cost a kings ransom, I am afraid I am somewhat "old school"
No matter, its just a hobby! which I am once again enjoying, one of these days I will actually get a boat into the water, the lake at Ribkata, is actually only 30 metres from my front door!
However , time for a coffee, it is now cold here in the mountains in the mornings , I hope you have a good day in Plovdiv my friend, and I hope that we may meet soon
doscoro Doug