Sunday, August 6, 2017

Keeping Your IOT Drone Under 250 Grams

Nothing requiring government registration can become mass consumer product

So are drones. Helicopters offers better hover duration than quads. But, Blade 200S is moving away from the 250 gram realm of Blade 200SRX. Luckily there is a quick fix. Use Blade 200SRX and common quad parts on top of the 200S body. And I reduce it to 236 grams. The weight reduction is 1.7 grams from common quad components tail section, 1.6 grams from home-made ESC-BEC, 3.6 grams from Xtreme 8-degree blades, 3.4 grams from EC2 2mm banana plugs, 2.3 grams from Microheli main shaft, and 2.1 grams from removing battery strap and jacket. The 200S body gains 2.3 grams . CC3D Revo Flight board with FS-A8S receiver make the electronics reduces 0.2 grams weight from stock AR636H +AS3X .
246.6 - 1.6 - 3.4 - 3.6 - 2.3 - 1.7 - 2.1 - 0.2 + 2.3 = 234.0
Comparison to stock components follow,

256.8 - 22.8(stool) = 234

202.1 + 68.9(battery) - 24.4(stool) = 246.6

Breakdowns of the weight loss

The tail weight is 2.6(fin+screws) + 17.5(motor+mount+wires+screw+prop) + 3.8(boom) + 0.7(female part of 2mm EC2 banana plugs) = 24.6 . The stock tail weight is 1.9 (fin+screws) + 17.9 (motor+mount+wires+prop) + 2.9(boom) + 2.5(support booms) + 0.4 (horizontal fin) + 0.7 (male servo plug not pictured) = 26.3 .
The kit has a standalone shaft tightening bolt (upper left corner). But the kid does 
not need prop holder because the push configuration presses prop down.
Stock does not have separate tightening bolt.

Second layer breakdown of the motor+bracket+wires+screw+prop in the tail section follows.

Prop is 0.2 grams lighter in my modification. Motor is also 0.2 grams lighter then stock.

ESC without main banana plugs is 16 - 0.7 = 15.3 . Stock ESC without main banana plugs is 19.4 - 2.5 = 16.9 .

Xtreme blade has hollowed body underneath the decal skin.

EC2 2mm banana plugs is less than 1/3 the weight of stock 3.5mm banana plugs

Carbon fiber main shaft is less than half of stock steel shaft.

Battery strap and jacket removed from stock configuration

New 200S's body gains some weight

Here the retail AR636 is 11.5 . CC3D(8.8)+A8X(2.5) is 11.3 .

. And CC3D settings follow,

. The bug in CC3D prevents me from using vehicle type "FP" fixed-pitch. If I select FP, INPUT in the flight data tab is put in orange, vehicle not flyable.