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Flight Times

Old 11-28-2010, 03:16 PM
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Default Flight Times

I would like to know how many minutes of flight with a trex 450 and using a scorpion 2221-8 3500 kv and a 11 tooth pinion with a 2200mah 30C pack should get just hovering must of the time with a little slow flying back and forth.

Thanks Everyone
Old 11-28-2010, 04:19 PM
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Default RE: Flight Times

My guess would be 6 minutes give or take. I normally set my DX7 timer for 6 minutes for the same battery and my Trex 450 Sport. You are not running hard, so your flight would probably be a bit longer. Your charger might be able to tell you what the voltage is after flight. If they are newer batteries, they will also last longer. If you could calculate the Amps your motor is drawing, you could calculate the time more accurately.
Old 11-28-2010, 04:31 PM
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Default RE: Flight Times

I'm only getting 4 to 5 on new 2200 30C packs and I've been told by others that they are getting 12 to 14 teen on 2100 20C packs.
I've checked everything on the heli including electronic's.
Change the motor & esc and still only get 4 to 5 it really is a mind bender and I'm about to sell it and go back to flying planes only.
I really hate to because flying planes I have to drive a long way, and with the gas prices and being on a very low fixed income makes it hard to do much flying.
With the heli I can fly it in my yard :=}
Thank You
Old 11-28-2010, 05:39 PM
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Default RE: Flight Times

What are your throttle settings?


4 to 5 min sounds about right for that setup. Remember, hovering draws more power than FF due to the lack of translational lift while in a hover.
Old 11-28-2010, 06:01 PM
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Default RE: Flight Times

Hello grawyl :=}
I also did some slow flight back and forth, but still got the same amount of safe limit.
My setting throttle curve is 100/70/50/30/0 and pitch curve is 100/70/50/30/0
I have it set with 8 degrees of pitch at full throttle.
I'm new and went by the manual suggested setting for new pilot.
Old 11-28-2010, 10:52 PM
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Default RE: Flight Times

Joe1,

If your Trex 450 is a belt drive, make sure the belt isn't to tight, that will rob power from the system and cause shorter flight times. 8 minute flights are pretty normal. But 12 to 14 minutes, that I'd have to see. Get a couple extra batteries too.

Also, try these throttle and pitch settings.

Normal mode

Throttle:
0, 50, 80, 90, 100

Pitch:
40, 45, 50, 75, 100

Dave
Old 11-28-2010, 11:13 PM
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Default RE: Flight Times

Normally my brain is tired after 6 minutes of hard flight. I'm happy to take a break, change batteries and start again. My recommendation is to get more batteries so you can enjoy the flight times you are getting. They are pretty cheap on Hobby King. I use Turnigy 2200mah 30C.
Old 11-28-2010, 11:17 PM
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Default RE: Flight Times

Hi Dave :=}
I've rechecked the belt tension and it is set according to the manual.
I will try those settings the next half way decent day I get, and will let you know, but I really think I got a bad batch of lipo's or just over rated ones.
Thank You
Old 11-28-2010, 11:30 PM
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Default RE: Flight Times


ORIGINAL: gi1mo2

Normally my brain is tired after 6 minutes of hard flight. I'm happy to take a break, change batteries and start again. My recommendation is to get more batteries so you can enjoy the flight times you are getting. They are pretty cheap on Hobby King. I use Turnigy 2200mah 30C.
I have 6 2200 30C ValueHobbies Yellow packs that have spacer's in between the cells that only have about 10 cycles and I also have 4 2100 15C T.P. Light packs that are 7 years old and I get about a half a minute more on them ???
Old 12-01-2010, 04:12 PM
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Default RE: Flight Times

My first suggestion would be to work on progressing to flying in idle up mode to keep a constant speed to your rotor. A flat or very shallow throttle curve (100,95,90,95,100) will help make it easier to fly, even though it may be a bit intimidating at first.

As far as the old batteries out running the new ones, you may have gotten some bad batts. I am down to only a few batteries at the moment and I am getting 4.30 min (timer set to 4:30) out of a 2200mah 20c battery running a flat throttle curve of 100 on a 3800kv motor and 12T pinion. My flying is mild 3D. I can gain about a minute to my flight time if I run in normal mode with a throttle curve (40,75,80,80,80).

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