A little crazy?

[TinLizzy]

[TinLizzy]

[TinLizzy]

[TinLizzy]

I had moved my helm forward 18 inches, which shrunk the cabin the same amount. I was able to get an additional 130 gallons of fuel onboard. Now I hold 280 gallons total. I still have some fit and finish to do, but over all it was worth it in my mind. We travel to a National Park that is 70 miles dock to dock, 60 miles of open Lake Superior. The gas out there was $8.62 a gallon last summer. So now I can make a round trip with plenty of reserves and not have to buy fuel over there.

[TinLizzy]

The last few pics were of my Garmin chartplotters showing the speed of 31mph at 3,000 rpm. Getting a 1.3 mpg with a pair of 454 Chevy's.

[TinLizzy]

I also just picked up a set of used Bravo 3 duoprop outdrives that I will install this coming season. After I tear them apart to make sure the internals are good. This should also improve my efficiency.

[TinLizzy]

Don't mind the big hole in top of the dash, it was a temp spot to mount the chartplotter while doing the water test. It has been covered.

[TinLizzy]

I'm thinking something happened to the amount of views on this thread. It was at 10,000 a couple months ago, now it says 2.4 million. Maybe the google algorithm directs them here from the thread title?

[Tracy]

I also just picked up a set of used Bravo 3 duoprop outdrives that I will install this coming season. After I tear them apart to make sure the internals are good. This should also improve my efficiency.

I am very curious what kind of performance increase these give you.
I have driven many boats with them and know "seat of the pants dyno" the difference is massive.
I have never seen a conversion with before and after specs to see what it actually does.

[TinLizzy]

Tracy, I also am very curious. On a 25 Bayliner flybridge with a single 454, my father switched out a bravo 2 for a 3 about 15 years ago. It gained about 3 to 5 mph at 3200 cruise. Pessimistically I think it will run about 32 to 33 mph at my cruise rpm of 3,000. Optimistically, I will be tickled if it will run about 35 mph. The drives came with 24 pitch props, which may or may not work, I won't know until my first water test. I have a single set of 26 pitch, so I would have to get one more set if the 24's don't work. I pulled the prop shafts out and looked at the gears and bearings and they looked good, so hopefully I can get a few years out of them.