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Table of Contents
2S Quadcopter
This is a planning page for a quadcopter using 2S batteries, more exactly 1300mAh. The reason is that I already have plenty of such for MS Composit Swift II and wouldn't want to get yet another different size only for one device. Something ultrasmall or even mini isn't the target. More likely something using 8" props resulting in around 30-40 cm motor to motor distance. The target flight time is around 6 minutes.
Motor options
Starting with the assumption that using a 8" prop would be the best option, the motor would need to have a KV of around 1400-1600 if the usualy KV for a 3S build is between 900-1100 for the same prop size. One possible problem can be that motors of this size use integrated prop holder that might not be stiff enough.
| motor | weight (g) | size (mm) | rpm/v | current | shaft (mm) | prop | battery | note |
|---|---|---|---|---|---|---|---|---|
| E-Power GC GT2203 | 16 | 28x12? | 1560 | max 6.8A | PH | 8x4.3 | 2S | http://www.flybrushless.com/motor/view/593 |
| Turnigy 2204-14T | 19 | 28x12 | 1450 | max 7.5A | PH | 8x4/7x3.5 | 2-3S | |
| Keda KD2203/41 | 19 | 27x20 | 1500 | max 8A | PH | 8x4.3 | 2S | http://www.giantcod.co.uk/forum/viewtopic.php?f=24&t=1610 |
| C2404 | 21 | 30x10 | 1900 | 9.4A | PH | 9x5 | 2S | that prop suggestion sounds wrong... |
| Blue Wonder 1300kv | 25 | 1300 | max 8A | 3 mm | 8x3.8 | 3S | 2S quadcopter mentioned in Giantcod comments, 460g/7.5A hover | |
| Blue Wonder 1500kv | 25? | 1500 | max 7A | 3 mm | 8x3.8 | 3S | ||
| E-Power GC GT2205 | 23 | 1660 | max 8A (12A) | 3 mm | 8x4.3 | 2S (3S) |
Turnigy and Keda seem to be the best options so far.
Weight calculation
These are really only rought approximations.
| item | weight (g) | note |
|---|---|---|
| 4 x motor @ ~20 g | 80 | |
| 4 x 15 cm square tube @ ~15 g | 60 | |
| 4 x 8" prop @ ~10 g | 40 | how about 3-blade prop? |
| 4 x ESC @ 7-12 g | 28-48 | |
| MiniWii | 8 | availability unknown, alternatives much heavier |
| FASST receiver | 10 | ppm is a must |
| Turnigy 1300mAh 2S | 90 | |
| baseplate | 20 | just a guess |
| wires and screws | 20 | just a guess |
| = | 302-322 | |
Flight time guestimation
The comments section of Hobbyking for Turnigy 2204-14T motor mentions the following thrust/current values (to be tested myself) with GWS 8x4.3:
| 3.5oz (100g) | 1.50A/8.0v |
| 5.3oz (150g) | 2.35A/7.9v |
| 7.0oz (200g) | 3.40A/7.6v |
| 9.0oz (250g) | 4.70A/7.3v |
With the planned weight, the quadcopter should be able to hover with about 100 g thrust from each motor (4 x 100 g = 400 g). As a result, we should be able to assume 4 x 1.5A = 6A as total current required for hovering.
| capacity | calculation | time |
|---|---|---|
| 1.3A | 1.3A / (6A / 60min.) | 13 min. |
| 1.0A | 1.0A / (6A / 60min.) | 10 min. |
| 0.8A | 0.8A / (6A / 60min.) | 8 min. |
If the battery isn't totally drained (like is shouldn't), a 1300 mAh battery can be expected to have something between 800-1000 mAh of usable capacity. That gives a hovering time between 8-10 minutes making a flight time of around 6 minutes realistic.
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