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View Full Version : Hacker esc setting for Aveox motor


james wong
08-19-2004, 12:04 PM
Hi guys,

I need some help in setting the esc for sport boat, the hacker is a 70 amps.

Currently, I am experiencing some cutoff, and the esc gets pretty hot. Can't really hold it for more than 3 sec.

Thanks

jw

Jay Turner
08-19-2004, 12:51 PM
What exactly is the designation of the controller; is it a Navy 70? Does the cut off occur when first starting, or after running for several minutes? How long do you run the boat on one charge? Are you running a receiver battery pack or the BEC?

What you are seeing could be normal if your boat/motor/prop are too aggressive or if you run for too long. Give us some additional information and perhaps we can be of more help.

Eagle
08-19-2004, 03:28 PM
I use timing mode two, the optimal mode for Aveox motors per the Hacker manual. As Jay said, we need some more info.

james wong
08-19-2004, 11:23 PM
Its a Navy70, seperate rec. batt. prop x445, Aveox 3630/1.5. Hull Triton, Batt 5s3p 6000mah. Watercooled motor and esc.

The cutoff is about 3 mins into play.

The timing setting is currently set at 2, the frequency is set at the second one as well.

Thanks

Jw

Eagle
08-20-2004, 08:28 AM
I run the same setup just with a gear and M445 in my Titan 40 and I have never had any problems with it. Thats odd. Now what exactly is it doing? Is it just stoping as you are going along, or if you stop the boat then try to get going again it takes a few seconds to go again? The ESC seems a bit hot too, do you have a way of taking the temp? Mine runs 120s-130s.

brooks93
08-20-2004, 09:13 AM
try and prop down.. I am not a pro on lipoly but, you voltage in that pack would be around the volts in a 18 cells pack and your setup direct on a 445 with 18 cells would be a hot setup. Try a 440 and see what you get.. the controller is doing what it was designed to do and save you some money

Jay Turner
08-20-2004, 09:39 AM
Absolutely prop down, that's too much voltage to run for over 2 minutes. According to the Aveox Virtual Test Stand, that voltage produces about 79 amps at 25,000 rpm and 104 amps at 20,000 rpm. I suspect that you are turning somewhere in between those rpm, so it is no surprise that your ESC shuts down. Either reduce the voltage or use a smaller prop to get the rpm up and the amp draw down. That's gotta be hard on the cells too....:(

Jeff Shriver
08-20-2004, 10:03 AM
Its a Navy70, seperate rec. batt. prop x445, Aveox 3630/1.5. Hull Triton, Batt 5s3p 6000mah. Watercooled motor and esc.

Kelly & Jay are right. That is a very hot setup. For P Sport Hydro, I use a 3630/1.5, M447 and 12 cells for 5 laps. You have the equivalent of about 15.5 cells in a mono for 3 times the time duration. You have to prop down big time if you want to run for 3+ minutes. The frequent thermalling of the esc is not very surprising. The problem is that you may have to prop below 40mm in prop size to run for the 3+ minute duration and keep heat down. Such a small size of prop may not motivate the hull. Some of your options: prop down big time, drop one of the series batteries and make it a 4s3p (and mayber drop one or two prop sizes), or pick a different motor with a lower Kv.

Andrewg
08-20-2004, 10:37 AM
an Octura X438 should be where u could sart -

As you will be running at a lower amperage you might also try timing mode one the motor will pickup efficiency by a few percent across the amp range and run cooler

james wong
08-20-2004, 02:22 PM
THanks guys, I think I got the message.

Eagle,
I couldn't get it going after I had stop. Gotta wait for about a min. before it can get going.

Turner,
"hard on the cells..." the cells are rated at 15c,

I'm going to try x440 tomorrow don't have any smaller. Will feedback.

Jw

pin
08-20-2004, 03:52 PM
王先生您好:
鋰電池5s3p應該是5串聯..3併聯!
其電壓應該為5 x 3.7V = 18.5V
但...Hacker 70Navy 適用的電壓最高到16cells(16 x 1.2V = 19.2V)
幾乎已到Navy70可承受電壓的極__!
且...Aveox 3630/1.5的 KV 為 1840RPM....
您又使用x445這支直徑過大的槳,
我使用軟體約略估算一下後得到以下結果....
耗電量為116安培
行走時間約為1.69分鐘
時速約有60KM/H
您如此搭配法....
ESC怎能不會發燙?!
小心再這樣搞下去電子變速器就燒掉了!!
建議您使用X437/3 Blade props可得到最佳的行走效率與約3分鐘的行走時間!

Best Regards

A-Ping謹上

Jeff Shriver
08-20-2004, 04:53 PM
the cells are rated at 15C

With your X445, you were drawing well over 15C according to FE Calc.

Eagle
08-20-2004, 05:28 PM
If you stop the boat, sometimes it takes the Hacker a few seconds to get going again, thats normal. But like everyone hase said prop that set up down!

photohoward1
08-22-2004, 12:14 AM
Hey once you get the boat tuned properly you should be able to run in the mid
40's mph for about 6 minutes with 6000mah to work with. Be carefull with the Aveox. Great motor but they do get Hot. After 6 minutes that thing will be smokin. If you get the motor to hot it will demagnatize. With the Lipo cells
once you find the right prop for amp draw the weakest point might be the motor.


love that you are using Lipo's

HT

Andrewg
08-22-2004, 01:17 PM
I take that back - start with a Y536!!!

james wong
08-23-2004, 12:45 AM
Ran the boat on X440, didn't experience any cutoff. I could be cooking the motor! Will check stat the next outing, just received the eagletree data recorder.

Any idea the max sustainable watt the Aveox can draw?

HT,

With Lipos the running times are much longer, usually we run the boats for 4 to 5 mins and let it cool by pumping water into the pick up tube.

Jeff,

Where can I locate the FE calc.

Pin,

I couldn't read your post, wat fonds I need to install?


Thanks

Jw

Andrewg
08-23-2004, 05:27 AM
Max sustainable amps would be more relevant and that will depend on the effectiveness of your cooling.

At the voltage you are running at it will be efficient at 50+ amps continuous so if the ooling is good you maybe ok. However as you will have a 7 minute runtime potential it would be wise
to check temperatures throughout the run.

It sounds as though you should go to a smaller prop you may be surprised at the results.

pin
08-23-2004, 08:59 AM
Hi james:

I'm sorry and i thought you can read the Chinese Big5 ....
so i type Chinese.
Forgive me :D

You can referrence Andrewg's suggestion.
He help me so much these years with the Fast-Electric RC boat knowledge and set up tip ... etc.
He is the best i have ever see!!

Jeff Shriver
08-23-2004, 09:35 AM
http://www.rcboataholic.com/fe_calc.htm

james wong
08-23-2004, 11:29 PM
Jeff,

Thanks for the add,

Pin,

No worries, I didn't install chinese fonds on my laptop.

Andrew,

Thanks for your pointers, will keep it in mind, will run smaller props when I receive it. Will post some pictures to show the boat cooling layout.


Jw

james wong
10-24-2004, 09:42 AM
Hi Guys,

Haven't got a chance to run the boat till yesterday.

Update- The boat ran well with x445! 80.5 kph about 50+ mph. It was the hacker that I had trouble with. Hacker 77 is capable of going into reverse!

Didn't think a boat esc can go into reverse. Anyway, when I let go of the throttle, the trigger spring into reverse and causes a 1 sec delay and I thought it was thermal or overload. Secondly, the esc does not like low throttle - it would not power on, have to let go of the throttle and squeeze it again.

The lipos were set up for 90 amps running.

Cheers

Jw

BACKEMF
10-29-2004, 09:26 PM
Your esc like mine also has car software in it! Cool! It can be fixed.
You have to follow the instructions on Fines Site FDM. To get it right.
My Aveox did the same thing on a Hacker 70. I just re-programmed it. :D

photohoward1
10-29-2004, 11:14 PM
Keep us updated and let us know how long the Aveox last with that kind of amp draw for sustained run times.

I bet you blow the motor after 1 season.

Listen to the experts Prop down. With the Lipos your motor is the weakest link.

The motor is not made to draw 70, 80 or 90 amps for very long.

HT

james wong
10-31-2004, 10:23 PM
HT,

I don't intend to run the Aveox that hot all the time. Just doing it for our local speed record. It managed 87.5 kph last sat.

Will definately prop down.

Jw

james wong
10-31-2004, 10:25 PM
Originally posted by ray schrauwen
Your esc like mine also has car software in it! Cool! It can be fixed.
You have to follow the instructions on Fines Site FDM. To get it right.
My Aveox did the same thing on a Hacker 70. I just re-programmed it. :D

Ray,

Thanks, will look into FDM site for instructions.

Jw