UL-1 Speed Control

[jfrancisco892]

I'm going to be running my UL-1 in LSH(limited spec hydro). I was thinking about getting a hobbywing esc and was wondering what amp rating i should get. I feel like there is more programmability with the hobbywing escs vs the stock aquacraft esc. I feel like it would be advantageous to be able to adjust timing and lipo cutoff voltage which to my knowledge cannot be programmed on the ul-1 stock esc. Let me know what you think.

[G-UNIT]

the hobbyking turnigy 120 seems to doing me good but the bec went out on 6s and now on 5s, but I tend to push things to the limit and l learn alot from my f ups, I now only run my ul-1 on 4s and work on set ups.
but the t120 has all the programing you need, cutoff,timing lipo settings, and their reasonably priced.

[jfrancisco892]

What would be the advantage of running the 120a compared to a 60a if i'm only going to run 4s. Just make it a little easier on the speed control. Or how about the 90a hobbywing esc. What setting do you run on your ul-1 120a hobbywing esc?

[jfrancisco892]

settings**

[G-UNIT]

Set it for 4s of cource,I think the timing is set 15 degrees, and low voltage at 3.0-3.2.
yes a 90amp esc is good also, I just like alittle leway just in case you want to try 5s, and 5s s is wicked but I don't race and don't know the rules, I guess spec racing is a stock set up on 4s but you can run what ever prop you choose.
its not always the speed but the driving, just ask Darin.
I'm on the east coast of FL near orlando and don't know of any fe clubs around here just the west coast club, and I don't relish driving that far, but maybe some day when i can get a weekend off to check it out, they seem like a good bunch of guys and or girls.

[jfrancisco892]

I don't know yet as I am just get into boat racing the first time this season. How does timing change performance?

[JoeOvercoat]

How does timing change performance?

Generally speaking, advancing the timing will make the motor run faster, but also sacrifice battery life and drive motor temperature (those go hand-in-hand: a motor running with advanced timing is not as efficient and so generates more heat). Adjusting it from the OEM's/stock settings is an option if you need more kV but don't have the space or cash.

Some ground vehicle ESCs adjust timing on the fly, to tune the motor to the demands of the moment, but I am not familiar with boat ESCs adjusting timing on the fly.

[Fluid]

The stock UL-1 motor is a 4S motor and will average from 70 to over 100 amps with most racing props; peaks can be over 120 amps. It is surprising that the stock AQ ESC handles this, it is clearly under-rated at 60 amps. The stock timing is 10 degrees. I have run my P-LSH with UL-1 motor at 15* advance but saw only a slight performance increase under normal conditions, it may have been just normal run-to-run variation.

A particular motor will need more timing advance the greater the load applied to it (prop size). Increasing the timing advance may or may not increase rpm at all, but it can increase efficiency, reducing temperatures and increasing power output. But once you go past the optimum timing advance for a particular load, heat will increase. In other words, too little timing can be as bad as too much.



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