Miss Geico Help

[koontek]

So got the new ESC installed and was setting up the receiver and I notice smoke was already coming out of the motor. Seems like I might have a bad motor? The battery's where not charge (storage voltage) and I didn't even have a prop installed! Here is short video I took. Motor temp got up to over 150 degrees right away, same with the ESC.

https://photos.app.goo.gl/g2jZN5rjjCebEHny8

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With that being said, maybe I should start looking for a different motor?

[fweasel]

150* from both the motor and and ESC on a bench, and that temp was through an empty water jacket... yeah, that's not right. Hopefully your new ESC isn't damaged too.

[koontek]

150* from both the motor and and ESC on a bench, and that temp was through an empty water jacket... yeah, that's not right. Hopefully your new ESC isn't damaged too.

I think the ESC is still okay. What would you guys recommend for a new motor? Should I go with just the stock Dynamite 2000KV or is there a better motor I can get for my money now? It would be paired up to the Turnigy 180Amp ESC.

[fweasel]

The new 36mm 1900kV Dynamite motor from the Shockwave and Miss Geico Twin has proven to be a solid runner, but I'm not sure what they price it out as a replacement part. Might not be competitive with other brands like SSS or Leopard in a similar size. I've run the slightly older DYNM3831 2000kV motor in many of the probat 29" cats and it's pretty good for the price.

[koontek]

The new 36mm 1900kV Dynamite motor from the Shockwave and Miss Geico Twin has proven to be a solid runner, but I'm not sure what they price it out as a replacement part. Might not be competitive with other brands like SSS or Leopard in a similar size. I've run the slightly older DYNM3831 2000kV motor in many of the probat 29" cats and it's pretty good for the price.

The Dynamite Motor 3674 1900Kv 4 Pole Brushless Marine Motor (DYNM3915) is $110.00 but currently backorder.

The A3650-2000Kv, 6-Pole, Water-Cooled, Marine Motor (DYNM3831) has been discontinued but it looks like Steve has a couple of them still in stock @ $65.00

The 3674 looks to be a lot longer can but not sure how much benefit I would feel from the 3650 in this setup. Are you running 6s on the 3650?

[fweasel]

Yes, I've run that motor on 6S in several boats.

[koontek]

I just wanted to update you guys on this project. With COVID 19 going on it was almost impossible to find a replacement motor. I ended finding a Dynamite 3674 1900KV 4 pole (the stock motor that came in the Sonicwake 36") from a seller on eBay. I swear at the time it was the only one available for sale! Got that finally wired in last night and will be looking forward to getting her out on the water!

Just wondering what brand of batteries is everybody running nowadays? The only matching pair of 3s battery's I currently own are some Traxxas 5000mah that I got in a package deal. They are showing some age and I know will not keep up with the demands. I have had some good luck with SMC with my 1/8th race program and was looking into picking up a pair of these https://www.smc-racing.com/index.php...product_id=555

Also, are you guys running xt60 or xt90 connectors? I'm leaning towards switching from my deans to xt60 connectors as I'm thinking xt90 might be a little overkill for this setup? Let me know your thoughts on this guys. Thanks!

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[fweasel]

I use the Turnigy Graphene batteries, both the original and the newer Panther version. They're excellent performers that have been well tested, but a bit larger then most, and certainly cost more. Turnigy's new Rhino batteries are said to be a very similar chemistry to the original Turnigy Graphene, at a much lower price point. Hard to get at the moment. It's also been suggested that the current China Hobby packs are identical to the Turnigy Panthers, again, at a fraction of the price. Not only do they appear to be identical in physical dimensions, there are some good test results on RC Groups that also lead to this correlation.

Twist ties make for better battery connectors than a Deans plug, so you can't do any worse. I think the new XT90 plug has antispark built in, which is a nice feature, but are only rated for 90A. EC5's have a higher rating of about 120A. Personally, I use Castle 6.5mm connectors on my 3S packs, which are rated at 200A. I use a lot of those packs in series for 6S.

[koontek]

Finally got her out to the local casting pond yesterday, the first time she's ran in 3 years...

Ran her with dual 3s batteries wired in series for 6S total power with the K45 prop. got up on plane no problem but the top speed was okay. Wasn't super slow but not super fast either. I would of hope for more speed but the motor and ESC temps were really low. Maybe she has some room for improvement. After about 5 mins of running, something got disconnected. I heard the motor scream but no movement. I for sure thought the prop came off but after getting her back (btw never go out again without a recovery boat!) the prop still attached. Pulled out the flex cable and it didn't break but failed. Not sure what happen? Maybe you guys can let me know what went wrong?

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[koontek]

Here is the running video before the flex shaft failed

[fweasel]

It looks like you have a reverse cable installed, and as such, were spinning it the wrong direction. Doing so, causes it to unwind, increase in diameter, and cause massive amounts of friction. You're going to need a new collet, a new flex cable, a new teflon liner, and possibly a new brass stuffing tube if that was damaged.

Think of the flex cable like a spring, it needs to be spun in the direction that tightens the coils.