How to test a pack?

ayash · 03-28-2009, 11:44 AM

I've built my first 7S pack for my Heli.

I was wondering if there is anyway to test it out before I actually fly it to make sure everything will work well at high current?

litespeed · 03-28-2009, 07:05 PM

Just run it on the ground without the main blades on it. It will draw enough amps to get a clue of how it's going to be. Then charge it up and see what went back into it. You should also balance or check each cell voltage to see how well the pack discharges.

That would be the simplest way.

Tom

Bill Sanford · 03-28-2009, 10:26 PM

Without the main blades on the amps will be nothing compared to actually flying...

litespeed · 03-29-2009, 12:22 AM

I guess I forgot to add get some head loaders. My bad! They look like wiffel balls on the end of arms that you bolt on instead of blades to mimic the load. I had a set loaned to me way back when.

You prolly just need to charge the pack up and take it for a short timed flight. Charge and guesstimate how much longer you can fly by what the charge adds back in and just fly some more.

Tom

SpeedVision · 03-29-2009, 03:56 PM

Quote:

Originally Posted by ayash

I've built my first 7S pack for my Heli.

I was wondering if there is anyway to test it out before I actually fly it to make sure everything will work well at high current?

You'll never get the answer to your question unless you provide more details like heli, esc, motor + kv, etc.

Lipo's and A123 are both high current so your question is a bit of a dead end without more info.

wlfk · 03-29-2009, 04:06 PM

Truth is, 9 packs into my A123 habit I've never tested any of them. The wires I've used are as high or higher rated than the wires in my ESC. My solder joints are good.

Do you have a spare receiver pack. I would suggest just go out and fly, but possibly use a receiver pack so that if your main pack fails you don't lose control.

To some extent you can also get a high current draw by leaving the helicopter on the ground, using blades + negative cyclic.

shaggybirdman · 04-09-2009, 07:50 PM

Quote:

Originally Posted by wlfk

To some extent you can also get a high current draw by leaving the helicopter on the ground, using blades + negative cyclic.

now that's a good idea

03-28-2009, 11:44 AM	#1
ayash Registered Users Join Date: Jul 2008	How to test a pack? I've built my first 7S pack for my Heli. I was wondering if there is anyway to test it out before I actually fly it to make sure everything will work well at high current?

03-28-2009, 10:26 PM	#3
Bill Sanford Registered Users My HF Map location Join Date: Jun 2006 Location: Bemidji, MN	Without the main blades on the amps will be nothing compared to actually flying... __________________ 2x TRex 650e;TRex 450 ; Blade 130x *Scorpion motors, Castle ESCs, BeastX FBL* *Voltz 101k & Honda generator for FAST field charging!!*

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

03-28-2009, 07:05 PM	#2
litespeed Registered Users Join Date: Jun 2006 Location: Missouri	Just run it on the ground without the main blades on it. It will draw enough amps to get a clue of how it's going to be. Then charge it up and see what went back into it. You should also balance or check each cell voltage to see how well the pack discharges. That would be the simplest way. Tom

03-29-2009, 12:22 AM	#4
litespeed Registered Users Join Date: Jun 2006 Location: Missouri	I guess I forgot to add get some head loaders. My bad! They look like wiffel balls on the end of arms that you bolt on instead of blades to mimic the load. I had a set loaned to me way back when. You prolly just need to charge the pack up and take it for a short timed flight. Charge and guesstimate how much longer you can fly by what the charge adds back in and just fly some more. Tom

03-29-2009, 04:06 PM	#6
wlfk Registered Users Join Date: Sep 2007 Location: UK	Truth is, 9 packs into my A123 habit I've never tested any of them. The wires I've used are as high or higher rated than the wires in my ESC. My solder joints are good. Do you have a spare receiver pack. I would suggest just go out and fly, but possibly use a receiver pack so that if your main pack fails you don't lose control. To some extent you can also get a high current draw by leaving the helicopter on the ground, using blades + negative cyclic.