Dear group,

I'm trying to list the components of a custom build hexacopter that would aim at:

  1. transporting a GoPro HERO 3 camera (for both video and FPV)
  2. being very stable (no jello effect)
  3. have flight times of 10 or more minutes.

Using ecalc [1] I've tried multiple combinations of batteries/motors but I cannot seem to get anywhere near a flight time of 10 minutes. Examples follow.

HEXACOPTER

1. Turnigy D2836-11 (750) with 2x LiPo 5000mAh 3S and props 12x4.5, give me (with a 733g weight without drive):

  • 8.19 flight time
  • 19.15 flight time hover
  • 59% throttle
  • efficiencies of around 75%

2. iPower 2217Q (880) with 2x LiPo 5000mAh 3S and props 11x4.5, give me (with a 733g weight without drive):

  • 6.8 flight time
  • 18.49 flight time hover
  • 53% throttle
  • efficiencies of around 81%

QUADCOPTER

1. Turnigy D2836-11 (750) with 1x LiPo 5000mAh 3S and props 12x4.5, give me (with a 733g weight without drive):

  • 6.25 flight time
  • 13.27 flight time hover
  • 64% throttle
  • efficiencies of around 78%

2. iPower 2217Q (880) with 2x LiPo 5000mAh 3S and props 12x4.5, give me (with a 733g weight without drive):

  • 8.05 flight time
  • 19.69 flight time hover
  • 57% throttle
  • efficiencies of around 82%

Any recommendations? Aren't throttle around 60% way too much?

Kinda lost here. Thank you,

r.

[1] http://www.ecalc.ch/xcoptercalc_e.htm?ecalc

Views: 819

Replies to This Discussion

Roberto,

get rid of 3s setups and look at 4s setups. I use 2x 5000 mAh 4s 20c packs, the turn 12x4.5 props on TM 3506-25 motors, driven by 20amp esc's with multiwii esc firmware.
Flight time with fpv aetup plus compact camera on a gimbal: 30 minutes

Regards
Marc

Thank you Marc,

I've just inserted the data you've given me in ecalc and this is what I'm getting:

According to this I get 7.06 flight time, 24.98 Hovering flight times.

Am I doing something wrong?

Flight time in ecalc means at full power!!!
We normally don't fly at full throttle all the time...
Most of the time, I am hovering or flying around but with only a little more throttle than at hover, which is sufficient to be quite agile.

thank you :)

do you know what it means that there's an "over limit" bar there at 14.2A?

This means over 14.2 A, the motors would pull more power than allowed in their specification.

Thank you Marc. :)

May I also ask you what frame / gimbal you are using? Hexa / quad?

3DR quad frame and a cheap, but well modified 2 axis camera gimbal from flyduino.net

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