Why does the 255 FSH Sport H have different impellers on the port and starboard engines?

[FSH 210 Sport]

Pretty sure it will be the NSX series…

https://jetboaters.net/threads/best-chartplotter-surface-mount-for-2023-ar190.43225/#post-672928

 

[TeenGee]

I started a new thread about side scan transducer installation.

https://jetboaters.net/threads/fsh-25x-side-scan-transducer-location.43847/

 

[MilesPrower]

Pretty sure it will be the NSX series…

https://jetboaters.net/threads/best-chartplotter-surface-mount-for-2023-ar190.43225/#post-672928

The Sport H that's pictured on the Yamaha website definitely has an NSX flush-mounted on its helm. With that said, during the first model year of the Sport E, Yamaha had photos of a prototype Sport E on its website that did not match the production Sport E in many features.

I would not use an NSX as my primary MFD, as I already stated in the post that @FSH 210 Sport kindly linked. The NSX is the bastard-child of the Simrad/Lowrance/Navico family right now. It doesn't fully support all of the shared features that the rest of the Navico ecosystem handles seamlessly out-of-the-box.

If I bought a Sport H today, I'd mount an NSS 12 evo3S above the wheel to use as my primary MFD (like I've done with my Sport E), and then I'd use the NSX as a sonar-imaging screen (like I do with my Sport E's factory-installed Go12 XSE). The S3100 sonar module (which I mentioned in the other thread) will allow you to run Active Imaging HD transducers for side-scan with a Fish Reveal overlay on the NSS and NSX simultaneously:

S3100 Sonar Module | Simrad USA

The compact S3100 sonar module brings Active Imaging™ HD to NSS™ and NSO™ Evo™3S displays for enhanced clarity and additional underwater views.

www.simrad-yachting.com

The only potential downside is that the NSX doesn't currently support single-point «Go To» autopilot commands — which might prevent you from touching a point on the side-scan scroll and commanding the trolling motor to take you to the location that corresponds to that point. But I haven't played with an NSX, so I don't know the answer to this. ?‍

Meanwhile, we've managed to completely de-rail this thread. That's what happens when you ask a geek or two to join the conversation.

 

[MilesPrower]

BTW, the NSS12 evo3S is on sale nationwide until end of this week:

Simrad Nss12 Evo3s Combo Multi-Function Chartplotter/Fishfinder - No Hdmi Video Out Port

Simrad NSS12 evo3S Combo MultiFunction ChartplotterFishfinder No HDMI Video OutportNSS12 evo3S Combo MultiFunction ChartplotterFishfinder No HDMI Video OutportImproved Charting experience with the iMX8 processorWith a 2X faster page loading t...

www.hodgesmarine.com

Simrad NSS12 evo3S Marine Display - C-MAP Charts & Advanced GPS Navigation | West Marine

Enhance your boating experience with the Simrad NSS12 evo3S Marine Display. Featuring US C-MAP charts, this high-resolution, multifunction display offers advanced GPS navigation, seamless integration, and fast performance. Ideal for serious boaters. Shop now for top-quality marine electronics!

www.westmarine.com

The NSS12 evo3S Halo 20+ bundle was on sale too. It looks like it's now out-of-stock online, but it's still available in certain West Marine locations:

NSS12 evo3 S Multifunction Display with C-MAP Charts, HALO 20+ Bundle | West Marine

Check out our NSS12 evo3 S Multifunction Display with C-MAP Charts, HALO 20+ Bundle and more from West Marine!

www.westmarine.com

 

[TeenGee]

Un-derailing.

https://jetboaters.net/threads/simrad-nsx-v-garmin-8412-un-derailing-255-fsh-sport-h-have-different-impellers.43881/

 

[Westie]

The Sport H doesn't have an articulating keel because its pumps don't always steer together. In other words, if it had a keel, which pump would it follow? Also, the keel would just add rotational resistance when the boat is being commanded to turn in place. So as y'all have surmised already, I bet the lack of an articulating keel required Yamaha to go back to impellers with different pitches in order for the boat to track straight(ish) ?, especially when the boat is "launching" on plane.

On a related note, during the first few months of owning my Sport E, I adjusted the angle of my pumps several times to adjust the boat's tracking without sacrificing straight-line speed. Eventually, I landed on one of the pumps and its associated Cobra fins "heeled out" slightly more than the other one — relative to the articulating keel. When I initially installed the fins, I mistakenly started with the keel centered... which caused the boat to pull to the side. And then I remembered that the boat came from the factory with the keel closer in angle to one pump vs. the other, and that's when I realized that the pumps are not counter-rotating, so the boat will tend to pull to one side.

I haven't been on a Sport H myself, but coincidentally, I caught up with my salesperson at my dealership a couple days ago when I was picking up my Sport E from its annual maintenance. She was raving about how the Sport H tracks so much better and is easier to dock, and that if she had the money, she would choose a Sport H without fins over a Sport E with fins, just on steering precision alone. (She was the person that originally convinced me to add Cobra fins to my first jet boat.)

On a side-note, I also adjusted the position of my transom-mount Active Imaging 3-in-1 transducer many times during a full day of testing on flat water with no wind, because even 1/2'' change in transducer position affected tracking and speed. (I've since mounted a second AI 3-in-1 so that each one is responsible for scanning its associated side.)

@MilesPrower I am curious to know which direction did your Sport E track before making the jet pump adjustments (Starboard or Port) and which jet pump did you toe out and by approximately how much to get it to track straitish?