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Old 04-13-2012, 01:05 AM   #1 (permalink)
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I have 6 3S 2200 maH batteries for my T-rex 450 I'd like to be able to use on a multi-copter. I'm looking at both the DJI F450w/naza and F550w/naza right now. I'm leaning more towards the 450 if my batteries will work with it, but I'd still like to hear from owners of both the 450 and 550 as to the pros and cons of each.

What kind of flight times can I expect for my battery size and would it be able to take two in parallel?

I've read about torsional flex in the arms and wonder if this is a serious problem, or if it needs to be addressed? What other problems do the Flame wheels suffer from? Should I purchase aftermarket props? Can someone explain to me the difference in the props included with the kit i.e. 8 vs 10?

Which retailer do you guys recommend to buy it all from?

Lastly, this is the only Multicopter I've really been exposed to. What are it's competitors if any?
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Old 04-13-2012, 02:09 AM   #2 (permalink)
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Hi Thursday and welcome! I like my F450 over my F550. I find it to be somewhat more stable and if you crash, and we all crash, the costs will be lower. I fly my F450 with 3S 2200 and 2650mAh lipos. I get about 6+min with the 2200 and 8:30 with the 2650's.

Don't worry about the torsional flex. It was a myth. Tighten up the arms and everything will be fine. Leave out 3-4 screws and you too can replicate the demonstration of arm flexing.
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Old 04-13-2012, 11:47 AM   #3 (permalink)
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Quote:
Originally Posted by Tahoe Ed View Post
Hi Thursday and welcome! I like my F450 over my F550. I find it to be somewhat more stable and if you crash, and we all crash, the costs will be lower. I fly my F450 with 3S 2200 and 2650mAh lipos. I get about 6+min with the 2200 and 8:30 with the 2650's.

Don't worry about the torsional flex. It was a myth. Tighten up the arms and everything will be fine. Leave out 3-4 screws and you too can replicate the demonstration of arm flexing.
Hi ed,

Thanks for the reply. Have you ever tried running two 2200 in parallel? Would the added weight be more of a hindrance then a benefit, and is it capable of 6S? Which props do you use?
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Old 04-13-2012, 04:28 PM   #4 (permalink)
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Don't think 6S is advisable, 4S is a huge performance gain over the 3S setups, with 6S you would need big slow motors to swing the props or really small props.
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Old 04-13-2012, 11:25 PM   #5 (permalink)
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I never have run 3S2P on my F450. I run 4S2P on my MK hexa. I get about 15 min flying with two 4000mah lipos. 4S is the max for the DJI motors.

@petedee

Running lipos in parallel adds the capacity together not the voltage. You get that when you run in series which I used to do on my 700E heli running 12S.
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Old 04-13-2012, 11:34 PM   #6 (permalink)
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I would say 2 of your batts for an F550 and 1 for an F450.
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Old 04-17-2012, 10:01 AM   #7 (permalink)
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I maidened my F550 with a battery that I bought for my 450x, a 3S 2200. 30C. I used the same battery prior to setup the NAZA, which meant that it wasn't quite topped off. I got a little over 5 mins. with ~ 3.78v per cell left. Did not try parallel, because I have a couple of 4S 6000 35C packs that need connectors soldered. Will test fly this weekend.
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Old 04-17-2012, 04:01 PM   #8 (permalink)
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Quote:
Originally Posted by Tahoe Ed View Post
I never have run 3S2P on my F450. I run 4S2P on my MK hexa. I get about 15 min flying with two 4000mah lipos. 4S is the max for the DJI motors.

@petedee

Running lipos in parallel adds the capacity together not the voltage. You get that when you run in series which I used to do on my 700E heli running 12S.
Yes I know, I was responding to if he could use 6S wasn't I!
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Old 04-17-2012, 07:09 PM   #9 (permalink)
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I have been running 1 S3 2200 on my 550, I limit it to 5 minutes and it does fine. I haven't tried 2 2200's yet but will. I love the 550 but never flown a 450. If your going to fly with cameras or FPV I'd go with the 4S batterys, I've one did the small key chain cam on the single 2200.
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Old 04-17-2012, 09:10 PM   #10 (permalink)
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I am using 3s 2200 25 - 50c nano-techs.on my450. I do light sport flying only, not carrying a load. have the timer set to 11:30. When putting back on charger it reads 10.5 to 10.6 volts.
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Old 04-18-2012, 11:23 PM   #11 (permalink)
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Quote:
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I am using 3s 2200 25 - 50c nano-techs.on my450. I do light sport flying only, not carrying a load. have the timer set to 11:30. When putting back on charger it reads 10.5 to 10.6 volts.
How many mAh's do you put back. 11:30 is a long time for a 2200. I can't get that out of mine.
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Old 04-19-2012, 10:08 AM   #12 (permalink)
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Going to try a 4S 6000 nano on my 550 this weekend.
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Old 04-19-2012, 10:10 AM   #13 (permalink)
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So dumb question, if the charger displays 3.78v and 2100 mAh at the start of charge, how depleted is the battery? TIA
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Old 04-19-2012, 08:58 PM   #14 (permalink)
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How do I measure mah? I only have a basic 50 watt charger.
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Old 04-20-2012, 09:21 AM   #15 (permalink)
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Quote:
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How do I measure mah? I only have a basic 50 watt charger.
Your charger should tell you by its display how many Mah it has put back into the pack. If it doesnt, get a better charger. This knowlege is vital in managing lipo batteries.
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Old 04-20-2012, 12:29 PM   #16 (permalink)
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I'll check the mah next time I charge. It's going to be a few days, as I have it apart to add LEDs.
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Old 04-20-2012, 08:05 PM   #17 (permalink)
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Quote:
Originally Posted by AzChopp3r View Post
Your charger should tell you by its display how many Mah it has put back into the pack. If it doesnt, get a better charger. This knowlege is vital in managing lipo batteries.
Ah ha, so at the end of the charging cycle. That makes sense. I've just been noting the time.
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Old 04-20-2012, 10:18 PM   #18 (permalink)
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As a general rule you don't want to put more than 80% of the capacity of the Lipo. For example if you are using a 2650mAh 4S lipo, when fully charged, you want to put back about 2220 mAh. If you put back more then you are over discharging your lipo and could shorten it's service cycles. If you are going to be in this sport, the best charger that you can buy will pay dividends in quicker charges and more flying time. I can charge 2 2650 in about 15-20 mins.
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Old 04-21-2012, 01:05 AM   #19 (permalink)
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That voltage seems quite low, below 3.6 volts per cell is bad, bad, bad. I suspect you charger is not reporting the voltage properly.
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Old 04-30-2012, 07:26 PM   #20 (permalink)
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Quote:
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How many mAh's do you put back. 11:30 is a long time for a 2200. I can't get that out of mine.
Sorry for the delay, soldering wires to the pads on the LEDs is quite a challenge for 60 year old eyes and not so steady hands. It looks like I am putting back 2000 milliamps back into the packs.

Based on 80% of capacity I would only want to put back 1700 to 1750 ma. I double checked the voltage on the charger with my DVM. Your correct, the charger is under reporting the voltage by .5 volts, so the real voltage is in the range of 11 - 11.1 volts.

That said I'll change the voltage cutoff on the Naza, and change my timer to 8 minutes and see what I am putting back, and adjust from there.

Thanks for the info.
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