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The biggest problem you face in an aluminum boat is having the EM motor cavitate out of the water. This happens because your main motor still sits high out of the water even off plane. Whereas on a heaver glass boat, the main motor is quite a bit more submerged.
This is the biggest problem with them, and the reason I wouldn’t own one. My cousin has one mounted on his 17′ fish and ski boat. They work OK as long as the weather is good, definitely a heck of a lot better than nothing, but get any kind of a wind and chop going, (which seems like ALWAYS where I live), and they quickly become useless. If you’re trying to maintain any kind of a speed in those conditions, you’ll drain batteries in a big hurry. (Any electric will have that problem.) To get anywhere close to 5mph, you’ll have the EM at max, and it won’t last long.
The other factor is that your boat control with them is really poor. You’re limited to the turning radius of your outboard, which just isn’t enough in less than ideal conditions, and, even for trying to get snags loose and things like that, you just don’t have the mobility. On top of that, you have to sit at the steering wheel to control the boat.
Personally, I’d go with a good bowmount with AP hands down. I’ve had this “discussion” lol with a few of the folks over at walleyecentral, and they were quite adamant the other way, but they also were all running big Rangers, and had every other option available to them as well.
Waxy