G23 Surf Set Up

[greggmck]

Read this post...

https://www.planetnautique.com/vb5/m...php?pid=617932

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[Daveed]

I wanted to respond back with tweaks I've made thus far, share the results, and (I hope) get some more input as to what my next steps should be.

Last weekend I set out with a crew of 4. I left the 250 lbs os lead in the bow and filled the ballast tank in the bow, leaving the rear ballast tanks and fat sacs empty. Weather conditions were pretty good (for North Texas), wind around 5 mph. We started early enough when there was little traffic on the lake so the water was reasonably calm.

I dropped the speed to 11.1, NSS and NCRS both to 0 and started a test run with a port side wave. As I expected, the wave was pretty short and not very long, but it was clean. I did notice water splashing up the starboard side where the swim deck meets the hull (noteworthy because I've not seen this before).

Next, I slowly added ballast to the stock ballast tanks in 10% increments. At about 30%-30% the wave looked big enough to surf on, so I threw a surfer out in the water, continuing to add water to the rear tanks in 10% increments, settling on 50%-50%. Now, because of the day to day inaccuracies of the ballast tank levels, I believe this to mean that the stock ballast tanks are about 100% full. I di verify throughout the day that the Fat Sacs were indeed empty.

Next, I moved 50lbs of lead to under both of the tower bases, leaving 150 in the bow and increase the speed to 11.3 mph. The wave was still clean and very friendly, meaning long enough to be able to get back in the pocket after a momentum loss and not so tall that it creates a big curl at the bottom of the wave that wants to grab the nose of the board.

Of note, the splashing on the starboard side at the swim deck continued. Also, I heard more of the exhaust note than ever before, I'm guessing because the rear of the boat wasn't so loaded down with Fat Sac ballast

Overall, I'm extremely pleased with the findings of the day, and I experienced the most enjoyable surfing of the year.

I guess my next step will be to add more lead ballast in the locations indicated in the graphics above.

[FLKeysSurf]

Update on our G25 setup. Per earlier note, our 2019 G25 had an additional bow sac and two 600# sacs in the lockers, which was epic wave at NSS=0 and NCRS=5 but lower NCRS just washed out. After lots of tweaking/testing:

- We sped-up from 11.2 to 11.7 mph, and that seemed to "wake-up" the entire system. First, higher speed obviously extends the wave, but at very minor impact to wave height and zero effect on push/power. Second, since we have a cleaner, longer wave, the effect of NCRS is much more noticeable. Third, the higher speed provides more consistency, with minor speed deviations having less effect (this may only be important for us, since we are on the ocean). The speed increase has been the biggest AH-HA moment for us.

- Settled on 450# sacs in the lockers along with the 450# bow sac. We can still run NCRS=5 to get a massive, fun steep wave, but can now use NCRS to tune the wave down. Interestingly, this setup closely replicates the location of stock ballast, so boat still sits and rides level, just a little lower in the water (i.e., our additional ballast has little effect on overall center-of-gravity). When we had the 600# sacs in the lockers, the G handled like a slammed old-school wakeboat, but with the 450# sacs it rides and handles like a sports car again. (Crazy that 300# in the back would make that big a difference when the entire setup is >10,000#).

We are not pro-level, so do not notice the goofy/regular side discrepancies and do not bother with the extra 200# on port side.