Shocker First Maiden Run -- ESC Literally BLOWS through Hull

[iop65]

look what German boaters do :they run 2200kv motors on 6s all day long in their cats
what size motors do you use for turning those 38 mm 3 -blades?

[flraptor07]

And as far as warranty goes, in this case they'll laugh at you!! Sorry but true....

[dmitry100]

iop65: http://tenshock-motors.de/Tenshock-B...ole-TSCZ2240_1

[iop65]

dmitri ; these are some pictures concerning your question
cooling lines in my jet-boat :

inside.jpgintake bottem.jpgoutlet.jpg


you get the idea how to improve the flow i guess

as you can see , still have to do some spraycan work :-)

[iop65]

that are good and powerfull motors but i guess that everything should be perfect for that set-up to work
when using 6s with this : not much room for errors!!
i would say that's for pro's

perhaps using/trying something less hot for starters?

[tlandauer]

Does it help to use some water pumps for this sort of thing, or is a good proper cooling flow sufficient most of the time?

Also, how do you guys suggest I repair those cracked seams in the front of the hull-- that the pressure from the burning ESC created? Perhaps it might be a good idea to lay an extra layer of CF.

Looking at how even sunlight seems to peak through soo easily... kind of scary what could happen if it ever hits a wave going like only 70mph.

Do I need to put down an entire 1-2 layers of CF everywhere, or just in the more vulnerable areas like seams, mounts, etc?
Which one of you has a how-to follow along about putting down CF inlays/reinforcement :)

This is known, you can see -thru the hull. One of the reasons I have not gotten the Zonda is that I don't entertain ripping everything down to do a CF layer which is needed if you intent to go fast.
As for the separation, you have to reinforce , hopefully you can get that far for a patch of CF or FG cloth. I personally don't like two-part expansion foam, but if after the repair and there is no way to have a lay up in front, this may be an alternative option.

[tlandauer]

Nobody thinks 1900kv is too much for 6s? Alrrrighty thennnnn. Burn em if ya got em I guess. Seems we have this kv discussion every spring.

1900kv on 6s is going to produce plenty of amps. If you were running at partial throttle the amperage would have been even higher. Then run it for multiple minutes that way? Amperage kills ESC. Sometimes before the thermal cutoff even has a chance to do it's thing. A simple stuff tube bend too tight could have blown the speedo. A burr on the stub.

I beat the crap out of my Seakings. I haven't been able to burn one.

Everytime when i say this, someone will always say I have been running kvs near 2000 with 6s without any problem, I stopped saying that because what do I know, lol......

[Luck as a Constant]

You can get away with higher kv motors on 6s in a twin. A single you may be asking for trouble however


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[Ken Haines]

Nobody thinks 1900kv is too much for 6s? Alrrrighty thennnnn. Burn em if ya got em I guess. Seems we have this kv discussion every spring.

1900kv on 6s is going to produce plenty of amps. If you were running at partial throttle the amperage would have been even higher. Then run it for multiple minutes that way? Amperage kills ESC. Sometimes before the thermal cutoff even has a chance to do it's thing. A simple stuff tube bend too tight could have blown the speedo. A burr on the stub.

I beat the crap out of my Seakings. I haven't been able to burn one.

I agree with Terry,
Really need to target 30,000 RPM (+/- 2000), unless you are attempting SAWS records.
The props just loose efficiency above this range anyway. Your props are the tool to go faster
but starting from that target area of 30,000 rpm. Use 3.7 volts per cell as your loaded cell voltage.
That means 3.7 x 6s = 22.2 volts loaded. Then multiply by the 1900....wow 42,180 RPM.
If you really want to run a 6s setup try staying at 1500 KV or lower motors.
Just my 2 pennies.

[kfxguy]

You can get away with higher kv motors on 6s in a twin. A single you may be asking for trouble however


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Agreed. Especially with 38-42mm props. 30k rpm is the old way of thinking. Technoloy have moved forward, I'm not sure why people's thinking hasn't.

[ray schrauwen]

What actual 6 pole 1900kv motors are you running???? You never mentioned brand or size.

Before you reinforce the hull you need to clean the crap in the cracks left behind by the magic smoke or glue will not take. After the huill is stripped and cleaned out, flush with 99% isopropyl alcohol.

I see you have the bec disconnected on one good ESC but, were you using bec on the burnt ESC?????

Aslo... was the side that popped the side that was doing most of the turning???

[tlandauer]

iop65: http://tenshock-motors.de/Tenshock-B...ole-TSCZ2240_1

I think he uses these^^^

[kfxguy]

What actual 6 pole 1900kv motors are you running???? You never mentioned brand or size.

Before you reinforce the hull you need to clean the crap in the cracks left behind by the magic smoke or glue will not take. After the huill is stripped and cleaned out, flush with 99% isopropyl alcohol.

I see you have the bec disconnected on one good ESC but, were you using bec on the burnt ESC?????

That's a good valid question there. The thing about the whole situation that gets me is one Esc was cool and it happened when he was walking with the boat. Not while running it. I honestly think if something wasn't hooked up wrong (like the bec thing) that he got a defective Esc. It happens. Those are good escs but you can get a defective anything.

[ray schrauwen]

I'd like to see a pic of the burnt ESC to see if the cap on board blew up as that is usually what the bang comes from then the smoke after... Yep, defects do happen... Drag, those are decent motors.

[iridebikes247]

Make sure the timing is set correctly, I've seen some escs get smoking hot because of incorrect timing....not setup.

Escs burn but its usually user error (i've done it), maybe the timing was wrong. I would try out a 442 2 blade next time out btw. As for the whole rpm thing....1900kv on 6s is fine as long as the motor works properly. Have you seen others use this motor with good results? A 6 pole is def harder on stuff than a 4 pole but I don't think the margin is enough to push you into failure. This boat should have come back quite cool.