Cobalt Boats Forum

Headed to the dealer tomorrow.. Pretty hard contact- although I’ve seen, and heard of much worse. (At least I didn’t have to be towed in) Doesn’t make it any easier to swallow once it finally caught up to me. I’ve been on this lake for 15yrs, traveled this route 100x without issue. This is my first ...

I’m on lake Champlain in northern VT. Roughly 98’ elevation.. I suppose I’ll have the chance to opt for the F5 prop- struck an unmarked reef finger at about 3k rpm’s yesterday. Damaged lower unit, and bent inner prop. Very minor vibration following, but pulling to initiate the repair. Tail end of th...

WOT is throttle is closer 52-5500 RPM- even at these RPMS I’m nowhere near 50mph. Not imperative that I’m running at this speed, Just trying to rule out and potential issues.

Just seems at high rpm’s for the speed I’m getting

That’s a good question- I can’t imagine anyone being pleased with the performance. We’re a young family- love the boat, have only put about 25hrs on thus far. We’re on a big lake, so at cruising speeds often. Clocking low 40s at 5krpm has been a concern all summer. Happy to find the forum, appreciat...

Thanks for the reply- I assumed there was an issue with the current setup

Happily upgrade the prop if that’s the solution. Just seems like this motor is working awfully hard to get me into the low 40’s.

Is this a general/recognized compliant for this motor with the F4 prop?

1st season with 2015 26SD Has the 380HP VP DPS - from what I’ve read, top speed should creeping on 50mph.. At WOT roughly 5100rpms I’m barley into the low 40’s with half tank and 2 passengers I’m pushing 4K rpm’s to get 30mph! Has the F4 prop- unaware of current pitch etc. Possible prop/shaft/couple...

Thank you!

That’s the next step- I don’t have RF dealer local to me. I’ll give them a call direct and start fishing for some info.

Appreciate the help. I’ll circle back here with updates

Thank you for this! Found and was accessing via the head compartment. Bad news however, I traced the issue to the black box itself.(not wiring, touchpad issue) The model of the current unit is theRFX4000-sx, and is discontinued. Looks as if it’s an easy swap out, but I’ve been unable to locate one. ...

Much appreciated!

Happy find the chat. I’ll head down to the marina and poke around a bit more, I’ll update the thread if I can locate

Hoping for some assistance here- 2015 26SD. Intermittent operation of main head unit (RFXMR5BB) both control pads at the helm and stern effected as well. Rockford suspect the black box being the issue, as all head units are displaying the same intermittent operation (constantly resetting, bouncing f...