Arnesons prop rotation
 

I know it's been beat to death here but haven't seen it talked about with a surface drive. Currently the props spin in and wondering the advantage if any of spinning them out. I'll give you quick details of what and how she runs. Boat is a 40' single step Hustler classic with 480HP Yanmars, ZF 280 trans 1.118:1 ratio, and #8 Arnesons. Props are 17.5" 39P 18R 5 blade Mercury CNC 1,500HP rated. Getting on plane needs full tab and about a 300ft. It's really not that bad. On plane with drives fully sunk and no tab she runs 65 at 2,800ish RPMs. As I trim up to Zero on the drives speed increases to about 70. With a little tab and a little more trim best I've seen is 74. I'm really not looking for maximum top speed with this boat. Like I tell my friends, if I wanted a 100mph boat I would of bought one. Plan is to make long trips on the Great lakes. I get roughly 2.5 miles to the gallon at 55mph. Ok back to driveability, she will start the chine walk and or porpoise if you get greedy with the trim. At around 70 on some days in some conditions you can feel/hear the boat riding on its step? It's really weird, it's almost like it settles. The water sounds differentt the drives and motor tone even changes. I can't repeat that with the same settings every time. Honestly only had it happen a few times. The boat is heavy, full cabin with generator, AC, hot water heater, the works. The 74 I've seen was fully loaded as heavy as she can get. Full fuel and water tanks. Now all that being said, what do you think the results would be spinning props out? Also she docks easy now, so if out makes that better I'd be really impressed. To swap rotation the transmissions just need a few wires reversed I believe, and obviously the props swapped side to side.

That is how the ZF transmissions work to counter rotate. Motor input has to be standard rotation then the transmission reverses the direction. That's right off the ZF site. https://cimg7.ibsrv.net/gimg/www.off...06c00595b.jpeg

I've never seen a surface drive boat that spins out

A quick Google image search and it's like 50/50 on rotation.https://cimg2.ibsrv.net/gimg/www.off...94e9520070.jpg
https://cimg7.ibsrv.net/gimg/www.off...6a9b508f8d.jpg

I have tried both directions on my Cigarette and I prefer turning out.

Can I ask why and what drives you're running? What was the biggest difference? Looking at all the images on Google of surface drives I noticed almost all the bigger boats turn out. Our boat is heavy compared to a stripped down go fast.

I would call the transmission maker with the model number and ask , because I know of someone who put the props on the wrong side and thought he would just run them in reverse and the transmissions did not last 2 minns

If the direction can be swapped without a lot of work I would try it , because no two boats react the same, when I spun it in it would try to push the whole boat out of the water ,when I spun it out it wanted to suck the the back of the boat down and push the front up.