Aerotec 420 Transom mod, +55 mm
Here finaly some pictures regarding the 55 mm transom mod of my Bombard. As the increase in height is as much as 55 mm and having a 55 kg engine, decided to go for a permanent solution, target to get it as strong as original.
Used marine plywood, epoxy glue, epoxy putty, epoxy primer and epoxy polyurethane finishing paint. Started the project by removing everything that is possible to remove from the transom.
Drilled "oversize" all old holes, to reach fresh plywood. Holes filled by hardwood plugs and epxy glue. Plugs sanded down so that they where covered with epoxy putty when even with transom. The extension part was made by glueing marine plywood to achieve 30 mm thicknes, equal to the transom.
Then by using a milling tool(newer used one before so needed to practise on som leftower wood) made a 8 mm wide and 20 mm deep "gap" in both transom and to the new extension part. Then made a 36 mm deep and 7 mm thick "counter part" to put in to the gap. Glued with epoxy. To further increase strenght, made from 12 mm marine plywood supports on both side of the transom, agin glued with epoxy.
Everything covered with primer and finishing paint. On top of the transom put a aluminum piece to reduce the risk of water going into the transom due to wear of the paint where the engine is attached. As always in my project, heavily underestimated the amount of work envolved, but still quite happy with the outcome. The mod did not add much weight, feels wery strong. Now engine is at about correct height, might be even higher but this is enough for now.
fun on a boat is inversely proportional to size...sort of anyway