I'm working on the new boat. She's a 1928 Oday 25:
The previous owner of my 1982 25 was kind enough to replace her outboard with a brand new 9.9hp mercury. Unfortunately the new motors weight exceeds the capacity of her original Garelick mount. I purchased a new mount (model 71091) to better stabilize the outboard and support it’s weight.
Photo [Outboard mounted on new Easy Lift, bolted to rear of flatbed]
Photo [Garelick 71091]
The 25 has a reverse raked transom which requires a wedge to correct the angle of the outboard prop. The original O'day wedge has too small a footprint for the new Garelick mount with its 10"X10" bracket. I've removed the original part and molded the new fiberglass/gelcoat shell for the replacement.
Photo [Foam mock -up of replacement wedge above. Its only got a few degrees of positive angle. I'm trying to strike a balance between prop angle in the water and lifting angle to get the outboard up. The old bracket was darn near impossible to lift at all. Had to tilt the outboard to get the lower unit out of the water and left the undersized bracket down.]
Photo [The yellow mold I made for the new wedge next to the final shell with it's pretty gel coat. FYI, I think I found a good recipe for tinting gel coat to match O'day off white. Holler at me if you need it.]
Photo [The new wedge next to the old.]
PPhoto [Inside view of the new wedge. Not the rubber filler on the inside of the original unit. I had a better picture of the inside of the old one, but Apple changed it's photo format just to mess with me and I can't post it on the forum.]
I'm at a crossroads regarding the filler material for the new wedge. The original was filled with some kind of mysterious hard rubber of unknown pedigree. Does anyone have any suggestions what this might be?
I've thought about filling with epoxy or poly resin but I'm already concerned with the weight of the motor/mount/wedge/transom reinforcement combo. I'm also concerned with the exotherm of such a large pour getting dangerous or ruining the shell... aaaaand epoxy ain't cheap in that kind of volume.
I've already cut and shaped some marine plywood that I could epoxy in, but I really don't like the idea of wood so close to the waterline. One point of moisture entry and the core will be rotten and all this hard work down the tubes.
Photo [Yucky wood core option.]
There's a seller of gallons of RTV silicone online that has caught my attention. Any thoughts on using it as a filler rubber? Will silicone properly bond to the poly resin inside surface? If I go this route I'll test it in a sacrificial shell of the same material before committing to pouring into the actual wedge, but I'd love to hear what you have to say before I spend the money to have a gallon of silicone shipped to the house.
http://siliconedepot.com/premium-10...ckets-and-pails-available-in-multiple-colors/
The previous owner of my 1982 25 was kind enough to replace her outboard with a brand new 9.9hp mercury. Unfortunately the new motors weight exceeds the capacity of her original Garelick mount. I purchased a new mount (model 71091) to better stabilize the outboard and support it’s weight.
Photo [Outboard mounted on new Easy Lift, bolted to rear of flatbed]
Photo [Garelick 71091]
The 25 has a reverse raked transom which requires a wedge to correct the angle of the outboard prop. The original O'day wedge has too small a footprint for the new Garelick mount with its 10"X10" bracket. I've removed the original part and molded the new fiberglass/gelcoat shell for the replacement.
Photo [Foam mock -up of replacement wedge above. Its only got a few degrees of positive angle. I'm trying to strike a balance between prop angle in the water and lifting angle to get the outboard up. The old bracket was darn near impossible to lift at all. Had to tilt the outboard to get the lower unit out of the water and left the undersized bracket down.]
Photo [The yellow mold I made for the new wedge next to the final shell with it's pretty gel coat. FYI, I think I found a good recipe for tinting gel coat to match O'day off white. Holler at me if you need it.]
Photo [The new wedge next to the old.]
PPhoto [Inside view of the new wedge. Not the rubber filler on the inside of the original unit. I had a better picture of the inside of the old one, but Apple changed it's photo format just to mess with me and I can't post it on the forum.]
I'm at a crossroads regarding the filler material for the new wedge. The original was filled with some kind of mysterious hard rubber of unknown pedigree. Does anyone have any suggestions what this might be?
I've thought about filling with epoxy or poly resin but I'm already concerned with the weight of the motor/mount/wedge/transom reinforcement combo. I'm also concerned with the exotherm of such a large pour getting dangerous or ruining the shell... aaaaand epoxy ain't cheap in that kind of volume.
I've already cut and shaped some marine plywood that I could epoxy in, but I really don't like the idea of wood so close to the waterline. One point of moisture entry and the core will be rotten and all this hard work down the tubes.
Photo [Yucky wood core option.]
There's a seller of gallons of RTV silicone online that has caught my attention. Any thoughts on using it as a filler rubber? Will silicone properly bond to the poly resin inside surface? If I go this route I'll test it in a sacrificial shell of the same material before committing to pouring into the actual wedge, but I'd love to hear what you have to say before I spend the money to have a gallon of silicone shipped to the house.
http://siliconedepot.com/premium-10...ckets-and-pails-available-in-multiple-colors/