Zonda 42 twin sea king 180's

[paulejr]

and the brand new boat will only hit 18 mph. batteries are new 5000ah , 50c , 22.2 v. 6s and each ESC gets its own battery. I have changed batteries , changed TX/RX, I do not have a program card for this and the instructions for doing the LVC change via the tx is beyond my control. I don't think it is LVC as both times I tried to run this boat was with fully charged pack showing max v test before installing them. the factory wants a video of the bench test as well as wanting me to manually do the LVC instead of auto ..This boat is one month old.

[Panther6834]

Others will be better equipped to help you...but, I am curious as to why you're running batteries in a boat with such low C ratings. Although my slower/smaller boats run packs with continues C ratings in the 50-75C range, all of my larger/faster boats run packs that have a minimum C ratings of 100C (most are 120-150C). Also (since you posted no info), could it be the props?


~ More peace, love, laughter, & kindness would make the world a MUCH better place

[paulejr]

Well, when i ordered the boat, the nomenclature stated 50c or higher. as i was looking for higher V and 6s I figured these Admirals would be a good start. I have a pair of 100 C G2's at 3s 11.2v and could try them in series on one of the ESC/motors? Any the factory just got involved saying they thought the LVC was the problem but they both test 22.2 v prior to running so the auto feature should see that they are not in harms way for being bad as all the cells test at max v 4.1., yes 24.4 v total at the wire. bench test , both motors sound the same and I sent them a video . tried to post here but too large a file. As for the props, they are TFL factory 40mm x 1.9.

[Panther6834]

Instead of trying to post video, it's easier to just post the link to the video. When several others wanted to see the dual rudder conversation I did on a ProBoat Shockwave, that's how I did it.


~ More peace, love, laughter, & kindness would make the world a MUCH better place

[Bande1]

if it really is LVC you shouldnt change the settings because there's something very wrong with the batteries if they're voltage sagging that bad. try your 3s in series for sure. does it spin up to high RPM out of the water without load on the motors?

[paulejr]

connect in series both batteries to just one of the two esc's ? ok here is the Youtube. this is with the 50c batteries on full charge 24.2 v

. https://youtube.com/shorts/mnLdrOKo9OY

[Xrayted]

OP, are you using a Futaba transmitter by chance? If so, Futaba, for some reason decided many years ago to use a throttle signal that is reversed compared to all other vendors.

This means you have to set it to reversed in the transmitter in order for it to be seen as normal by most ESC?s. What will happen is that It will think that forward is reverse. If you run the throttle as normal in the TX, it will only run about 15 to 20 miles an hour because the reverse function on a marine ESC is throttle limited and runs very slowly

it will also prevent you from getting the proper tones to calibrate the throttle endpoints on the transmitter, so if I had to guess, it certainly sounds like your throttle signal is backward based on the symptoms you describe, and those ESC’s you have do have the reverse function active from the factory, and this is not a function you want to use on a fast electric boat

Once you get this sorted, you can simply set the reverse portion of the throttle channel endpoints in your radio to zero to kill reverse until you get a program card to disable it within the ESC

[Panther6834]

connect in series both batteries to just one of the two esc's ? ok here is the Youtube. this is with the 50c batteries on full charge 24.2 v

. https://youtube.com/shorts/mnLdrOKo9OY

You set the video as "private". That makes only you can view it. Need to change setting to "public".


~ More peace, love, laughter, & kindness would make the world a MUCH better place

[vvviivvv]

You also have to take battery C ratings with a pinch of salt...


Do you really think 150c 5000MAH batts can provide 750 amps / need too? true C rating is rare and this is something to be aware of.

I have 65C / 130C burst packs in a boat that is 140mph+ and this is no tiny boat, its 60"

[paulejr]

changed to pubic as is my first You tube and no street signs .... ha i found it!
I started out with a Futaba 3pv. then after much aingst i switched to a Spektrum and got the same results. 15-18 mph. when the mono it came from runs very well. so now my UL-19 pukes at 20 mph as well.. must be the water. but its thrl switch is not functioning so... frustrating.

[Panther6834]

changed to pubic as is my first Youtube and no street signs .... ha i found it!

Nope...still private...lol


~ More peace, love, laughter, & kindness would make the world a MUCH better place

[Xrayted]

C ratings on all Lipo’s are marketing nonsense. 99% of all packs are 30 C or less no matter what is on the label. This is not a Battery or LVC issue.

[paulejr]

ok try again.
also vvviivvv , I have no clue what you are talking about . I am too new to FE to understand the jargon and be able to apply it to a conclusion that is success for me on this problem.

[paulejr]

I ordered a programmable card but will take eons to get here ... ( it seems ). Waiting to hear from the factory but tech says my bats were clipping/ sagging voltage????? and the ESC's ( both ) were shutting down to the reduced speed... huh

[Xrayted]

Did you read my post #7 above regarding your throttle channel in the radio being reversed? What you’re describing is exactly what happens if it is reversed, or “not reversed” if using a Futaba radio. You don’t need a program card to solve this