charlemith20
17.06.2021 11:42:19
Recommended for 4.2L V6 Offshore outboards, 225-300hp. Yamaha SDS propellers require special hardware to operate, which is included with Yamaha 4.2L V6 Offshore and 3.3L V6 four stroke "XA" models.
See full version: Saltwater Series II Prop 6D1-45972-00-00
Recommended for 4.2L V6 Offshore outboards, 225-300hp. Yamaha SDS propellers require special hardware to operate, which is included with Yamaha 4.2L V6 Offshore and 3.3L V6 four stroke "XA" models.
Recommended for 3.3L outboards, 250-300hp. more
Recommended for 3.3L outboards, 250-300hp.
Recommended for 3.3L outboards, 250-300hp.
Recommended for 4.2L V6 Offshore outboards, 225-300hp. Yamaha SDS propellers require special hardware to operate, which is included with Yamaha 4.2L V6 Offshore and 3.3L V6 four stroke "XA" models. more
This illustration shows how the SDS keyed washer engages the prop hub.
Yamaha SDS components include the keyed washer in the foreground and the splined rubber damper, shown here in place over the prop shaft. The damper mates to the shaft with a splined bronze insert, and is press-fit into the prop. It’s been removed from the prop here for clarity. more
Innovation takes the "clunk" out of shifting gears at Yamaha.
SDS serves a purely aesthetic purpose – to eliminate the “clunk” sound that is the take-up of freeplay, mostly in the shifting mechanism and bevel gears in the gearcase, when the motor is shifted into gear. The SDS hub features a splined rubber damper mated to splines within the stainless steel prop hub. The rubber damper, which is a softer material than was used in previous prop hubs, acts like a torsion spring and allows the prop to rotate about 3/8-inch before engaging a keyed washer against slots in the prop hub. When thrust is initially applied, instead of banging against the driveline the prop now sort of gently “snugs up” to the prop shaft. No more clunk.
When assembled, the keyed washer fits into slots in the prop tube. When the motor is shifted into gear, the prop twists against the tension of the rubber damper until the keys on the washer engage with the slots in the prop hub, creating a solid connection between the prop shaft and the propeller. more
As I mentioned, this is a cosmetic enhancement. Yamaha says SDS does not enhance gear-train durability. Outboards have always smacked into gear, but as the motors have become quieter and quieter, that clunk has sounded louder and louder. These motors are supposed to be refined. Motors that go clunk don’t belong on a $250,000 boat. [links]
There are a bunch of 230 owners on here with various motors, and they may have some prior experience to share with you. I will move this topic to Props and Performance where it will fit in better.
Jun 30, 2017 #2 2017-06-30T21:37
Yeah, RPM at top speed (with motor optimally trimmed) will tell us if the current prop is too big or too small. If you're at or near 6000 RPM you probably don't want a smaller prop, even though that would improve hole shot. On the other hand, if your top end RPMs are low, say 5000-5400, then you could probably go with a smaller prop.
Jul 02, 2017 #10 2017-07-02T20:20 [links]
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