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Author Topic:   Engine Brackets and Gas Useage

RFK posted 07-11-2001 06:39 AM ET (US)
Got a brochure for Powerboat Report which had a provocative statement implying that engine bracket use brought increased gas useage with it. Any truth to that statement?
Clark Roberts posted 07-11-2001 06:56 AM ET (US)
RFK, engine bracket sets motor back from transom and allows it to be raised! Higher engine mounting means less underwater drag from lower unit and this results in increased fuel mileage and better all around performance... how much depends on a host of factors like prop, trim angle, etc. in concert with the raised engine! Look at page 28 Cetacea and you will see a 13 with a power set-back bracket and a 25hp Yamaha... this rig is awsome and will run mid 30's top speed and run on plane in 10 inches of water.. note that the 8" set-back allowed me to use a short shaft (15") motor on the 20" transom.... no blow out on take off or hard turn.. takes a lot of tweeking and fiddling but worth the effort. Currently I run a 5" setback on a 15'(40 Merc) and an 8" setback on a 21 Revenge (135 Merc). Also use Doel-Fins on all! Happy Whalin'... clark.. Spruce Creek Navy
hauptjm posted 07-11-2001 10:14 AM ET (US)
RFK, What issue did you see this in? I'm curious if it was a misprint or ignorance! Brackets have long established track records of [i]improving[i/] not only fuel mileage, but also performance. I've been fortunate to be able to compare my bracketed 18OR to an otherwise standard 18OR with identical engine, and the difference is obvious. In fact, the boat I compared to is lighter than mine, because mine is a full transom version and his is a standard notch transom. I'm guessing I weigh probably 200lbs. more, yet I was faster, quicker out of the hole and use less fuel.

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Author	Topic: Engine Brackets and Gas Useage
RFK	posted 07-11-2001 06:39 AM ET (US) Got a brochure for Powerboat Report which had a provocative statement implying that engine bracket use brought increased gas useage with it. Any truth to that statement?
Clark Roberts	posted 07-11-2001 06:56 AM ET (US) RFK, engine bracket sets motor back from transom and allows it to be raised! Higher engine mounting means less underwater drag from lower unit and this results in increased fuel mileage and better all around performance... how much depends on a host of factors like prop, trim angle, etc. in concert with the raised engine! Look at page 28 Cetacea and you will see a 13 with a power set-back bracket and a 25hp Yamaha... this rig is awsome and will run mid 30's top speed and run on plane in 10 inches of water.. note that the 8" set-back allowed me to use a short shaft (15") motor on the 20" transom.... no blow out on take off or hard turn.. takes a lot of tweeking and fiddling but worth the effort. Currently I run a 5" setback on a 15'(40 Merc) and an 8" setback on a 21 Revenge (135 Merc). Also use Doel-Fins on all! Happy Whalin'... clark.. Spruce Creek Navy
hauptjm	posted 07-11-2001 10:14 AM ET (US) RFK, What issue did you see this in? I'm curious if it was a misprint or ignorance! Brackets have long established track records of [i]improving[i/] not only fuel mileage, but also performance. I've been fortunate to be able to compare my bracketed 18OR to an otherwise standard 18OR with identical engine, and the difference is obvious. In fact, the boat I compared to is lighter than mine, because mine is a full transom version and his is a standard notch transom. I'm guessing I weigh probably 200lbs. more, yet I was faster, quicker out of the hole and use less fuel.