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--- rc:2s-quadcopter [20.09.2011 00:32]
vergo [Weight calculation]
+++ rc:2s-quadcopter [23.09.2011 01:08]
vergo [Weight calculation]
@@ Line 25: / Line 25: @@
 ^  item  ^  weight (g)  ^  note  ^
 | 4 x motor @ ~20 g |  80  | Turnigy 2204-14T has a prop shaft of 5.3 mm |
-| 4 x 1x1x15 cm square tube @ ~15 g |  60  |
+| 4 x 1x1x15 cm aluminium square tube @ ~15 g |  60  |
 | 4 x 8" prop @ 5 g |  20  | how about 3-blade prop? flyduino 8" props have a hole of 4.65 mm |
 | 4 x ESC @ 10 g |  40  | 10A, 6A could save a little weight |
@@ Line 31: / Line 31: @@
 | FrSky TFR4  |  7  | ppm is a must |
 | Turnigy 1300mAh 2S |  90  |
-| Baseplate |  42  | would plywood be lighter? could be smaller than 10 x 10 cm |
+| Baseplates |  42  | would plywood be lighter? could be smaller than 10 x 10 cm |
 | Wires and screws |  20  | just a guess |
 ^ ^^^
 |  = |  367  | seems a little bit heavy... |
+Since I'm not going to change the battery, the most obvious places to save weight would be the baseplates (maybe too sturdy for a light weight quad), the aluminium arms (shorter with 3-blade props?) and the motors (are there suitable alternatives?). It would be nice to have the weight closer to 300 grams. Smaller props might result in smaller current needed during hover with the cost of climb speed but a benefit of longer flight times.
+[[http://www.ecalc.ch/xcoptercalc_e.htm?ecalc|xcopterCalc]] suggests that using a 7x4 props would provide better efficiency instead of using 8x4 props. The hover time would still be about the same. The motor to motor distance could also be smaller with 7" props resulting in less weight from the motor arms and a more portable size.
 ===== Flight time guestimation =====

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