Thanks for the info. You are right in that these pumps are heavy, but talk about solid construction. From what I remember, even with the weight of these SS drives, the boats were still wicked fast and maneuverable. I like the idea of the extra weight as it'll keep the intake well in the water with less air intake.
I have a mould for a jet sprint hull, was thinking of making a few hulls and setting this drive in it.
I remember reading that Craig was working on some new technology. He had stated that prop drives are ~30% efficient and jet drives are ~36% efficient. He went on to state that his new drive was upwards of 60-70%, was working on patents. Never heard anything past that.