ProBoat UL19_76mph!

[sammyha]

I took this one off the back burner after purchasing a pair of MaxAmps 3s 5200mAh 175C discharge spec lipos. They are worth every penny I might add. Here's a link to the video of my best SAW run so far with the UL19...

https://youtu.be/7jyo76JVkyU

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[Bande1]

So you ran 2000kv on 6s? I was assured by the most legit long time racers here on OSE that those kind of RPM's will blow an ESC up. And anyone who makes videos of themselves doing over 30k RPM is hiding the fact that they destroyed their boat.

[sammyha]

what comes stock in that boat? what prop? motor?

It's a 3656mm, 2000kv motor. Running on a 120 amp ESC. It came with a 1716 stainless steel prop.

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[fweasel]

The only facts here are the designer of that boat recommended propping down when running 6S. The included prop was intended for lap racing on 4S. The stock setup can handle 6S for shorter speeds runs, with increased heat and obviously shorter run times.

The other fact is that MaxAmp Lipos are a giant waste of money. If you got the performance you wanted out of them, you're an excellent driver and the boat is setup properly. I would suggest another well respected brand of battery in the future for even more performance at a lower price point.

[sammyha]

The only facts here are the designer of that boat recommended propping down when running 6S. The included prop was intended for lap racing on 4S. The stock setup can handle 6S for shorter speeds runs, with increased heat and obviously shorter run times.

The other fact is that MaxAmp Lipos are a giant waste of money. If you got the performance you wanted out of them, you're an excellent driver and the boat is setup properly. I would suggest another well respected brand of battery in the future for even more performance at a lower price point.

fweasel, please advise me on a better lipo! These are noticeably better than what I had. But what's the gold standard?

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[Xrayted]

Sammyha, check out the first page of the Lipo testing thread link below that has been running for more than a decade. These guys do yearly controlled load testing of a variety of packs due to the fact that C ratings are known to be marketing nonsense, and the maxAmps brand has been the running "joke" of the lipo world the entire decade they have been testing them. Thunder Power is also right there with them, and they have the same high price/garbage quality, preying upon the uninformed that will believe the marketing hype

They are bottom of the barrel, barely 15C garbage packs that are being sold at 2-3 X what far better lipo brands out there are sold for. The results on the first page are always kept up to date with the latest load testing, broken down into weight categories and what load each pack could handle without failing completely.

The Max Amps 5000 mAh pack lasted literally ONE second under a 125A load before the voltage sagged down to 3.7V per cell, and consistently comes into last place in their various testing. 125A currents are nothing for FE boats which usually average much higher currents. Compare that same 125A constant load test to an SMC pack that held for a whopping 71 seconds at that same load, and for less than half the MA pack cost!

https://www.rcgroups.com/forums/showthread.php?1767093-Battery-Load-Test-Comparisons

SMC is the current best performing lipo you can buy today, is US owned and based with actual customer service directly from the owner. Even "if" the MaxAmps was exactly as good as SMC (its nowhere close), you still paid 3 times as much as a same pack from SMC with much better performance would have cost you.

https://www.smc-racing.com/index.php?route=product/category&path=67_119

[sammyha]

Sammyha, check out the first page of the Lipo testing thread link below that has been running for more than a decade. These guys do yearly controlled load testing of a variety of packs due to the fact that C ratings are known to be marketing nonsense, and the maxAmps brand has been a literal "joke" of the lipo world the entire decade they have been testing them.

They are bottom of the barrel, barely 15C garbage packs that are being sold at 2-3 X what far better lipo brands out there are sold for. The results on the first page are always kept up to date with the latest load testing, broken down into weight categories and what load each pack could handle without failing completely.

https://www.rcgroups.com/forums/showthread.php?1767093-Battery-Load-Test-Comparisons

SMC is the current best performing lipo you can buy today, is US owned and based with actual customer service directly from the owner. Even "if" the MaxAmps was exactly as good as SMC (its nowhere close), you still paid nearly three times as much as the same pack from SMC with much better performance would have cost you.

https://www.smc-racing.com/index.php...ry&path=67_119

Thank you

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[fweasel]

I currently like the CNHL packs for budget vs. performance that have tested well in the test post Xrayted linked to above. I had been a previous fan of the HobbyKing/Tunrigy Panther lipos, but their quality has nose dived over the years, which is too bad because my 4yr old race packs are still going strong.

[T.S.Davis]

Down side to CNHL is that they are massive. Avoid the parallel packs. A 4s2p pack has 8 cells to possibly go wonky. Sucks to lose a pack for just one of them.

I've been running some Yowoo lately. Bang for the buck is pretty good but I don't swear by them. They're just okay.....ish.

ML Boatworks just picked up the Dynogy line. I don't know if he has them in hand yet though. These were my cell of choice for quite some time. First set I raced with at the 2010 nats I think. I'll likely order a bunch once he gets them in his mitts.

[sammyha]

Thank you very much for the feedback guys...

I can say this about the MaxAmps lipos I bought. The UL19 was consistently running 71-73mph with the 70C discharge Revolectrix lipos I was using. To jump to 76mph, and on a short-ish run is a big increase. And I'm sure there's more to be had. It was loose but staying down.

That said, I'm listening. Price, size, weight are all factors along with output. I'll be shopping lipos for my RSX 380 next...

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[ray schrauwen]

Down side to CNHL is that they are massive. Avoid the parallel packs. A 4s2p pack has 8 cells to possibly go wonky. Sucks to lose a pack for just one of them.

I've been running some Yowoo lately. Bang for the buck is pretty good but I don't swear by them. They're just okay.....ish.

ML Boatworks just picked up the Dynogy line. I don't know if he has them in hand yet though. These were my cell of choice for quite some time. First set I raced with at the 2010 nats I think. I'll likely order a bunch once he gets them in his mitts.

Where did you buy the Yowoo's from?

[ray schrauwen]

Down side to CNHL is that they are massive. Avoid the parallel packs. A 4s2p pack has 8 cells to possibly go wonky. Sucks to lose a pack for just one of them.

I've been running some Yowoo lately. Bang for the buck is pretty good but I don't swear by them. They're just okay.....ish.

ML Boatworks just picked up the Dynogy line. I don't know if he has them in hand yet though. These were my cell of choice for quite some time. First set I raced with at the 2010 nats I think. I'll likely order a bunch once he gets them in his mitts.

About 7 years ago or more Dinogy sold some 2S packs that were 2P but not advertised as 2P. I also have some HobbyKing packs still that are 2P and not advertised. They all worked well. It's a trick to lower the internal resistance numbers though... I still have the Dinogy packs, bought them from Larry.

[sammyha]

So you ran 2000kv on 6s? I was assured by the most legit long time racers here on OSE that those kind of RPM's will blow an ESC up. And anyone who makes videos of themselves doing over 30k RPM is hiding the fact that they destroyed their boat.

I would say for sure if you're running laps. Would no question overheat the electronics. Everyone doing SAW runs for max speed is overloading the electronics.

Believe me or not, I really don't care, but I've probably got at least 50 SAW runs on this boat running on 6s and over propped...

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[Dirk Jan]

Great job Sam, I like your speed running adventures. You got a great lake to run as well (at least in summer time).

I have good experience with the CNHL lipo's as well. They often have great discounts. I'm not sponsored by them [emoji6] but they pack great punch, compared to my Youme 60C lipo's.

[sammyha]

Great job Sam, I like your speed running adventures. You got a great lake to run as well (at least in summer time).

I have good experience with the CNHL lipo's as well. They often have great discounts. I'm not sponsored by them [emoji6] but they pack great punch, compared to my Youme 60C lipo's.

Thanks! And I appreciate the feedback...

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