Re: Converting GW 24 Explorer from single to twin engine...H
Enclosed transom... sorry, missed that in your first post. That certainly takes a big "variable" out of the mix. I don't have your exact model, but I think the dimensions are pretty close and I can run (GPS) 45MPH in the right conditions. Having the engine on a bracket (which I do) helps with performance. Hurts backing up at low speeds, though - but trimming the motor up so the prop wash is directed more under the hull helps some. But of course twins will help some with that, too. Although since they are so close together they won't provide the benefits that you would see in a wider beam boat - but still better than a single.
Boy, you go through engines, huh? How many hours on your 225? Although many, many people go large distances off shore with a single, I do understand the notion of wanting redundancy. Aside from costs, what about fuel economy (in regards to going long distances off shore)? I'm assuming you have a good idea of your current setup. Is there any way you can find out how much fuel you'll burn with the twins? I imagine it will be more, but I do not know by how much. Just something else to research!