Reply With QuoteThank you guys so much for your help in this project planner. After the research here and in other forums as well, I have decided to go with a '19 gulling. I am going to try to find a used boat that is in need of an engine and pump to cut the cost enough to off set the purchace of a dual drive pump set up. Both pumps will run A impellers. The Cadillac is a torque motor-not a horse power motor, and the dual jet drive is a torque application. Herald Bruce of Dual Drive inc. (714-993-2664)was very helpful and had much test data to draw from. Acording to him, a 500 pound '19 gullwing running dual jets and set up with the correct impellers will see mid 80mph top speeds without getting the engine above 4500 rpms (my horsepower peak) and the 3200 rpm torque peak of 611 footpounds turning two pumps will deliver unbeleivable acceleration. That style of boat should be stable up to 100+ mph should I decide to upgrade the motor at a later date. I chose the gullwing over the tunnel hull because the Cad can push the gullwing to the speeds I want and I can keep more manuverability.
The Cadillac engine I will be using is a copy of the stroker engine build up in Street Rod magazine, It is at 9.5:1 compression and uses pump gas. If memory serves correctly, it is 535 cubic inches.
Trivia: during the dyno test on that motor-the dyno pumps could not put enough pressure on the engine to measure its true torque until it was almost at 2000 rpms. They had to use a computer to calculate the off idle torque. Estimated torque at 1500 rpms-going by memory here-was 350 foot pounds. I can't find that article, if anyone has it, please publish the correct readings if that was wrong. A comment by the owners of the dyno machine (published in the article) was that they requested dyno testing time to be limited because they were afraid the engine would break the dyno....... Don't take my word for it-look up the article and argue with the author. Point being, that engine begs for a dual drive set up, and I feel that in this combination in a light weight boat is going to put out performance numbers that are so impressive no one will beleive the claims-which means I'll get a lot of races, and hopefuly an article done on the boat in a maganine.
I welcome any comments or suggestions. If anyone contacts Dual Drives Inc., please tell Harold that "Cody"-the guy who wants to build the "Cadillac gullwing" sent you. Maybe I will get a discount for the free advertising- ha ha. If I get my money together by January, I hope to have this HOT BOAT in the waters of Arkansas next summer.
