Hello AAC. I have been trying to get this thread out for a while now. I have a couple thrust questions in relation to a trolling motor i am designing to work with a smaller, more cost efficient battery opposed to a Marine Deep Cycle. With new technologies in the electric motor world, it is easier than ever to get large amounts of torque out of a motor that does not use that much power. My design consists of a 12v motor with a drive shaft going down to a 90 Degree gear box that connects straight to the prop shaft. Im looking for around 3000 RPMs in a motor. The math says a majority of motors that can produce this kind of RPMs will be able to push my little 200lb boat at a decent pace. Now I'm coming hear to hear a few suggestions on parts. Any decent size 12v motor with an RPM rating of 3000 will work for this project. If anyone has done a similar project and has a product/brand recommendation that would be great. Next is the 90 degree gear box. I have seen someone with a similar project take on out of an old grinder that has a 3:1 ratio. This is where i need a little help. I know these are a little pricey, but i want a good quality box that doesn't break the wallet. Lately and arguably the most difficult part of this project is the battery. I want the motor to last approximately 1.5-2 straight hours of operation. Something light and cost efficient would be ideal. All Help is greatly appreciated!