Zippkits jae 21fe v2 outrigger_wood kit build

[sammyha]

I think I'm doing this right. I've cleared the Data Log and went out and ran the boat. I was going to do one run and check it, but on the first pass she lifted at 116 mph and almost blew off. So this is two runs. Here's the full graph showing volts of the pair of SMC HCL/HV 4s lipos, in series for 8s. Full charge is 34.8 volts...



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[sammyha]

Here's the 121 mph pass zoomed in with the other values turned off. She pulled the volts down to 20.7 if I'm looking at this right. I have LVC turned off...



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[sammyha]

Fwiw, peak rpm's of 48,153 on the 121 mph pass...



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[sammyha]

Divide 8984 watts by 336.1 amps equals 26.73 volts. Right? Which would be above LVC if set at 3.0 volts/cell. Good there I'm thinking.

The lowest volt reading was 20.7 volts. Is that from kicking to full trigger after the transition? That's why I turned off LVC. I'm figuring it didn't stay there long by looking at the zoomed in graph.

What I don't understand is the 26.73 volts calculation since that is based on max numbers. Shouldn't that be the same as the lowest volt reading since that's also max lowest volts?

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[Bande1]

Divide 8984 watts by 336.1 amps equals 26.73 volts. Right? Which would be above LVC if set at 3.0 volts/cell. Good there I'm thinking.

The lowest volt reading was 20.7 volts. Is that from kicking to full trigger after the transition? That's why I turned off LVC. I'm figuring it didn't stay there long by looking at the zoomed in graph.

What I don't understand is the 26.73 volts calculation since that is based on max numbers. Shouldn't that be the same as the lowest volt reading since that's also max lowest volts?

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edit: this is 8s? oh I thought it was 6s. thats not good you're dropping to 2.58v per cell. the 26.73v thats normal sag. I wonder if the 20.7v is a fluke or something?

[sammyha]

edit: this is 8s? oh I thought it was 6s. thats not good you're dropping to 2.58v per cell. the 26.73v thats normal sag. I wonder if the 20.7v is a fluke or something?

Yes, 8s
Fluke possibly, because it doesn't align with the max watts and amps numbers. The sag to 26.73 is 3.34 volts/cell. Not bad, right?

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[Bande1]

not bad at all especially for 336A. These are SMC HV?

[sammyha]

not bad at all especially for 336A. These are SMC HV?

Yes

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[vvviivvv]

This thread has convinved me i need to order a kit.

Is the hardware you are running the kit they are selling here?

I'll try and re-read it all, i work offshore and can't access the youtube videos but ill build it when im home!

https://zippkits.com/index.php?main_page=product_info&products_id=652

[sammyha]

This thread has convinved me i need to order a kit.

Is the hardware you are running the kit they are selling here?

I'll try and re-read it all, i work offshore and can't access the youtube videos but ill build it when im home!

https://zippkits.com/index.php?main_...roducts_id=652

I'm running Speedmaster hardware, but that will work fine...

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[Bande1]

This thread has convinved me i need to order a kit.

Is the hardware you are running the kit they are selling here?

I'll try and re-read it all, i work offshore and can't access the youtube videos but ill build it when im home!

https://zippkits.com/index.php?main_...roducts_id=652

not only are they badass for top speed, they lap like nothing else with almost no effort. mine keeps up with the nitro racers at 70mph on 6s. on top of it all they are actually fun as heck to build. leave the battery tray out and you can get some pretty big batteries in it.

[racerr73]

Sam,
I saw you blew the Castle Hydra esc up in the youtube video, just wondering if you still have those data files you posted from the esc. If you do turn on the "ripple" setting and see what voltage the maximum ripple was at. It should be no more then 10% of total voltage, if it is more then that you will need to add extra capacitors to the esc which will reduce the ripple number.

[jkflow]

Just found this thread, nice work! Working on something similar, but my main issue is access to a sufficiently sized lake.

Some tips, save your data logs, you can always go back for more details. Several of your questions can be answered by your logs.
Throttle - just turn on throttle graph and will tell you where current is peaking, also gives a gauge on how smooth your finger is. I know it's limited by length of lake etc.
Ripple - using the same castle in multiple setups and highly recommend adding a small cap pack, ripple is usually in the 20%, oddly enough not during full throttle. Build your own.

If you turn on all the relevant graphs, I can help walk you through any questions.
Voltage sag is about as expected, with the loads you are running. You are getting roughly 80C (not adjusted for sag etc), which is incredible for a lipo.

Cheers! Love your sharing idea, which more would do that and keep this hobby moving forward.

[Xrayted]

Your ripple observations are normal. Ripple current is always the highest at 50% throttle when the off/on PWM cycles are equal time. Its the lowest at zero throttle (of course) and 100% throttle when the on cycle is essentially 100%, and you can see this easily in the logs as you stated when you overlay the throttle out over the ripple. This is why its so important to make sure you are using the proper KV motor or gearing if used for what you want to do, and this applies to any RC craft.

Its why running low throttle constantly on an improper setup made to go much faster is an electronics fire maker if the caps get overwhelmed, so if one has a 2000KV motor that goes 100 MPH wide open but they only want to go 50, then swap the motor/prop out instead of running the boat around all day at 50% throttle. Its also incredibly inefficient for the electronics because having to chop that full pack voltage down to go slower means the rest gets turned into heat, and why they can get hotter running partial throttle vs wide open. Its counterintuitive, so many think they are actually making things better by running slower

[sammyha]

Ok! I appreciate this feedback! I'll upload some more Data Log screenshots. I'm on the steep side of the learning curve with this. I'll just do the best I can.

I can see I have some numbers that are not good. First screenshot is the voltage and ripple on my earlier 122 mph run. Ripple max of 5.98, voltage dropped to 21.5 min. I hovered the mouse over voltage minimum.

By my calculation ripple is at 27.8% of voltage sag. Not good.

Feel free to correct me if I'm wrong. Also bear with me as I try to upload screenshots properly...



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