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01-24-2007 02:24 AM  10 years agoPost 1
brokenrotor (RIP)

rrApprentice

Haughton ,La ,USA

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With the Battery protection option set to middle how long will the Trex 600 fly before the motor shuts down ?

Will it give you some kind of warning?

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01-24-2007 11:17 AM  10 years agoPost 2
SRH990

rrKey Veteran

Birmingham, UK

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If you fly until the speed controller shuts down the motor you have two problems: -

1. Flying a helicopter with a motor shutting down is a good way to get an expensive repair bill.

2. If you fly until the LVC comes into play you have over discharged you battery pack and its going to have a short life.

The main rule is never to discharge your lipo more than 80% of its rated capacity, that would be 800mah for a 1000mah battery, 1600 for 2000 etc. Lipo's voltage drops very quickly at the end of the pack and the LVC really is too late for this. The best way is to fly by a timer, set you timer for 5 minutes and fly, charge the pack and see how much goes back in and adjust flight times each flight until you are near the 80% point, don't forget different styles of flying will use more or less energy from the battery.

For the 600 I found that a 5 minute flight when setting up so nothing more than gentle hovering and circuits used around 2000mAh from the pack, I now have my timer set for 5.5 minutes and use around 3800mAh, just on the good side of 80%. My LVC is set to its lowest setting, I don't want the motor to shut down as it could cost me the lipo pack and a repair bill after the crash. If flying by a timer is difficult then you can get lipo warning devices that trip at a higher setting than the LVC and give a visual and sometimes audible warning, I'll stick with my timer

Steve -Trex 700N, Trex 600N, Raptor 550E, 450SE, Mini Titan, Logo 5003D, Beam E4

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01-24-2007 06:17 PM  10 years agoPost 3
docjoe

rrElite Veteran

Stockton, CA United States

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I agree with Steve. Don't fly until you lose power. Set a timer and stick to it. For your flying style, you'll want to see how much an average flight will pull off the batteries. I'd start with a 4 minute flight, land it and then charge it back up. You can increase the flight times which correspond to about 80% of the total battery capacity. I'm flying 6 minute flights on my Evo 20s and putting back 3600-3900 mAmps.

Also, if you overdischarge your batteries, you will significantly compromise their life, resulting in less cycles.

Joe
We haven't seen Colonel Angus around these parts for years!

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01-24-2007 06:33 PM  10 years agoPost 4
Tintin

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Akershus, Norway

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Not very good answers to the questions, just other good info.
At medium setting it will start pulsing power when voltage reaches 2.9 volts and cut at 2.6 volts.
You can safely put it at high protection, then it will warn you by pulsing power at 3.2 volts and cut at 2.9.
You won't be flying long after it starts pulsing, very hard to miss that one so you will be putting it down before it cuts completely.
However even 3.2 volts/high protection is pushing it a bit.

“Getting an inch of snow is like winning 10 cents in the lottery.”

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01-24-2007 07:47 PM  10 years agoPost 5
efliernz

rrVeteran

Hamilton, New Zealand

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Set the LVC to the lowest voltage and fly with a low-volt alarm set to 3.33v per cell

Pete, Trex500, Trex600E, Streched 600, DSX9, DX7, Low-volt alarms - check the gallery for my alarms

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01-24-2007 10:25 PM  10 years agoPost 6
Tintin

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Akershus, Norway

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Or just leave it there or have it at the highest setting. With Petes alarm you'll be notified before it kicks in, very highly recommended...

“Getting an inch of snow is like winning 10 cents in the lottery.”

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01-25-2007 10:48 PM  10 years agoPost 7
brokenrotor (RIP)

rrApprentice

Haughton ,La ,USA

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I have it set to medium setting.
I think I check in on a voltage alarm.
and time all flights to 5min.
i am using the TP 5000 ma packs.

From what i am reading I can fast charge at 1C 5 amps
This sounds kind of high to me what do you guys think?

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01-26-2007 03:17 PM  10 years agoPost 8
SRH990

rrKey Veteran

Birmingham, UK

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From what i am reading I can fast charge at 1C 5 amps
This sounds kind of high to me what do you guys think?
Charging at 1C, 5A isn't fast charging, its the recognised standard charge rate. If you're using a 1010/210 combo or even an Astro 109/V Balancer setup you can charge well above 1C, I charge my FP 4900 packs on the field at 8A with my 109 & V Balancer, I think the 1010 will go slightly higher, this usually charges the pack in 30-35 minutes.

Steve -Trex 700N, Trex 600N, Raptor 550E, 450SE, Mini Titan, Logo 5003D, Beam E4

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