Is extreme cavitation and violent bouncing normal on a stock BL SV?

[beetleman]

I recently got the SV, and did the standard stuff I read in this forum, such as epoxying the wood, moving the antenna to the hull, siliconing all the hardware, etc. Since both battery holders were not glued to the hull on arrival, I set them up with hook and loop so that they can be moved back and forth in the hull for balancing (securing the batteries to them with rubber bands). Other than that the boat is bone stock.

On the maiden voyage the boat refused to go on plane and cavitated horribly. Squeezing more throttle rendered a violent bounce that seemed very bad for the boat. After a few tries I got the courage to squeeze the throttle even more despite the bouncing, and eventually it sort of got on plane - still terrible handling though. Moving the batteries up to 3 inches forward did not do much.

After a few more tries the boat died in the middle of the pond. After retrieving it I checked to find it was dry inside (taping the hatch works) and touching the motor and ESC felt a little hot, but did not seem like an overheat. The rudder fin responded to the transmitter, but the motor didn't. I had to disconnect a battery and reconnect and arm the ESC to get it back to life. Does the stock ESC have a built-in heat protection auto-shutoff or a failsafe? Otherwise, what's going on with this supposedly uber-boat?

Is this normal behavior of a stock SV out of the box?

[Raydee]

LOL Uber-Boat....I never heard that claim before on a Super Vee. The Super Vee is a great little boat but you will most likely need to get yourself some OSE adjustable trim tabs on the boat. They make a big difference and will stop the nose from bobbing up and down once you have them adjusted correctly. How long were you running before the boat cut off? Keep in mind that if you were letting off the throttle and getting back on because of the front end bouncing it is very possible that you over heated the ESC. Brushless ESC's like to be run wide open for best efficiency. When you start running part throttle on a Brushless esc it causes heat and will cause your esc to go into thermal protection. Get yourself the adjustable trim tabs, sqeeze that trigger and hold it wide open as much as possible.

[beetleman]

I didn't think the trim tabs have any effect in such low speeds of cavitation. I was running for about 5 minutes of which none was in full throttle, so I guess it did overheat. But shouldn't it kick back in after cooling down?

Do you know if there's a built-in failsafe in the stock ESC?

[kck741]

I know you said bone stock but are you useing the stock prop

[Ctonez]

what batteries are you using?

[raymund629]

Bouncing and not planing were the problems on the first few runs on my Super Vee. Then l got the OSE adjustable trim tabs. Now my Super Vee runs very smoothly. And i'm also running a cf48 prop which has less cavitation.

[kck741]

also with the stock SV you cant ease into the throtle you go W.O.T

[beetleman]

I know you said bone stock but are you useing the stock prop

Yes, I'm using the stock prop.

[beetleman]

what batteries are you using?

I am using 2 Venom 3300 NiMH batteries.

[beetleman]

also with the stock SV you cant ease into the throtle you go W.O.T

What does W.O.T mean?

[beetleman]

Thanks guys for your answers. I don't think the stock trim tabs are an issue because this behavior happens at low speeds, but I may be wrong.

Two questions that are still unanswered:

1. Does the stock ESC have a built-in failsafe (for signal loss)?

2. Shouldn't the ESC kick back in after cooling down when the boat is dead in the middle of the pond because of an overheat?

Thanks

[raymund629]

Yes, what does W.O.T. mean?

[Eodman]

Wide Open Throttle W.O.T.

[Daveo]

Thanks guys for your answers. I don't think the stock trim tabs are an issue because this behavior happens at low speeds, but I may be wrong.

Two questions that are still unanswered:

1. Does the stock ESC have a built-in failsafe (for signal loss)?

2. Shouldn't the ESC kick back in after cooling down when the boat is dead in the middle of the pond because of an overheat?

Thanks

The ESC does have a low voltage cuttoff. It is set to stop at 60% discharge from the initial voltage of the battery. So if you put in a full peaked battery the cut off will stop at 60% of full discharge. The ESC checks the voltage when it gets armed and then calculates the cutoff from the initial voltage reading. And no it will not come back on untill the batteries are unplugged. I have had first hand experience with this.

I also had an issue getting the boat to get on plane. My problem turned out to be the batteries. I went with lipos and have had no such problems since.

[raymund629]

Can someone please explain what is meant by WIDE OPEN THROTTLE or W O T?