Wednesday, August 15, 2018

IoT Drone Weight 250 Grams Breakdown

Sorted by the weight of the components

Tattu 800mah 25C lipo battery set - 53.1 grams

The newer batches are lighter at 50.9 grams with less capacity proportional to the weight. Worst case 53.1 grams.

EMAX 2808 660KV Motor - 52.8 grams

The stater weighs 28.7 - 29.6 grams; the bell weighs 23.2  grams. Worst case 29.6 + 23.2 = 52.8  grams.

   

T-Motor 4004 kv400 motor - 47.4 grams



The weight of the bell is between 17.3-2.4=14.9 and 17.6-2.5=15.1 grams. With the lighter bell, the total weight is 47.6 grams with 2 stater tabs. The worst case with the heavier bell and single stater tab is 32.3+15.1=47.4 grams.

Blade 230 main frame - 23.1 grams

The main frame comes between 26.1 grams and 26.3 grams. The hardware screws weigh 1.3 grams. Cleaning the frame reduces 4.5 grams maximum resulting in between 21.6 and 21.8. So the installation is between 21.6+1.3=22.9 and 23.1 , worst case 23.1 grams

E-Flight BSR main frame - 21.6 grams

The main frame comes between 20.5 grams and 21.4 grams. The hardware screws weigh 1.1 grams. Cleaning the frame reduces 0.9 grams maximum resulting in between 19.6 and 20.5. So the installation is between 19.6 +1.1=20.9 and 21.6 , worst case 21.6 grams.


Oxy2 210mm main blade set - 17 grams



Caddx Turtle camera - 15.9 grams

The 2 screws on the sides of the camera is measured at 1.2-0.9=0.3 grams. The power/signal wire set is measured at 0.9-0.3=0.6 grams. Removing the Molex Picoblade plug saves 7.1g-7.0g=0.1 gram. The back plate of the camera with spacers is 1.0 gram. The earlier production of the camera without the microphone is lighter. The worst case total weight is 14.1+2+0.3+0.6-0.1-1.0=15.9 grams.
  

Turnigy MX-95E digital servo set  - 14.7 grams

Per unit is 9.8 / 2 = 4.9 grams. 3 units per craft is 4.9 x 3 = 14.7 grams

LHI/HobbyMate 1306 kv3100 brushless motor - 11.1 grams




The motor weighs consistently 10.8 grams after trimming the excess of shaft. The bolts with or without washer weighs 1.0g - 0.7g = 0.3 grams. Total 10.8+0.3=11.1 grams.

Favorite Little Bee 20A ESC - 9.7 grams


Raspberry Pi Zero W - 8.9 grams


Oxy2 Sport main grip - 5.9 grams

The newer batches are heavier. 5.9 grams worst case.



CC3D Atom flight controller - 4.7 to 5.1 grams

The servo signal wires, used optionally with Raspberry Pi, weigh 1.1-2x(0.35 plug)-4x(0.05 solder)=0.2 grams. Another pair for tapping power for Pi


Lynx Blade 230 carbon fiber tail boom - 4.1 to 4.8 grams


Trimming 3.7cm for the raised 45 degree tail fin reduces 4.8x3.7/25.5=0.7 grams.

GOQOTOMO FPV camera - 4.6 grams


Blade 230 swash plate - 4.4 grams


E-Flight BSR landing skid - 4.3 grams


Microheli Blade 230 tail fin - 2.4 grams



E-Flight BSR servo push rod set - 2.2 grams

The original set on sale is shown as 2.0 grams. The 1 extra ball link pair with rod needed to connect to DFC pin is shown as 0.4 grams. The long rod's non-threaded part to be trimmed out is 0.6 - 0.4 = 0.2 grams. So the 4 links total is 2.0 - 0.2 + 0.4 = 2.2 grams.



The long rod, after cutting out the center, non-threaded area, has 2 short segments, each for 1 rear servo rod. One of the original rear rod is used for the front rod. The second original rear rod is used as one of the DFC rod. The extra ball link pair from a second purchase of this item has 1 rod for the second DFC link. The extra ball link pair from the second purchase of this item has 2 ball sockets for the 2 DFC links.

28 AWG silicone wire - 2.1 grams per 90cm



Velcro tie 3/4 inch with adhesive - 1.9-2 grams per 19-20 cm

0.8g / 8cm = 0.1 grams per cm

Microheli Blade 230 main shaft - 1.8 grams


JST-XH charging plug and cable - 1.7 grams 


Blade 180 CFX main rotor hub - 1.6 grams

XT30 connector -  1.6 grams

Gemfan 5030 propeller - 1.5 grams


Blade 180 CFX feathering shaft - 1.4 grams


AKK IPEX 5.8GHz antenna - 1.2 grams


Oxy2 Sport DFC pins - 1.2 grams


FrSky XM+ RC receiver - 1.2 grams


FrSky R9 Micro receiver - 1.1 grams


Microheli Blade 230 tail fin bracket - 1.8 grams

M1.5 x 6mm self-tapping screw - 1.0 grams per 13 pcs

The scale is calibrated with the small bag. 1.2g x 13 / 15 = 1 gram

E-Flight BSR anti-rotation bracket - 1.0 gram



4x8x3mm bearing set - 1.0 grams


M2 fastener set - 1 gram

2 4mm bolts with nuts, 2 6mm bolts, 1 10mm long bolt.

Mounting inch squares - 0.3 to 0.9 grams per 1 to 3 squares


Solder - 0.5 grams per 28-30 points

The 4-8 soldering points adds 0.1 grams, average 6 points. The wires in the first picture have not been pre-tinned in at the cuts. The reading oscillates between 3.6 and 3.7 in the second picture with 4 soldering points, and it settles at 3.7 in the third picture with 8 soldering points.


The solder is a tin-lead alloy and the density is about 9 times that of water. It can be reasoned that each solder job has 1mm cube pre-tin on each side of the wires then joined. So, 2mm cube per job, and the weight is 0.1cm x 0.1cm x 0.2cm x 9g/cc x 6 = 0.1 gram.

28-30 points of added solder are 6 tail motor wire joins, 3 main motor joins, 6 joins for the battery build, 2 for battery plug, 2 for power distribution point, 2 for CC3D power tapping.Then, either 6 points on the caddex turtle or 8 points on the raspberry pi wires. The ESC build uses its own residual solder.

Wolfwhoop 5V 3A buck converter - 0.8 grams


CHENYANG Ultra Mini DM Micro USB 5pin OTG Adapter - 0.7 grams per pair



Blade 230 anti-rotation bracket - 0.6 grams



Clear mounting tape - 0.7 grams per square inch

The CC3D board's width of 19mm is 75% of a inch for each of the 4 8mm. strips The strip on the row of pins uses half the height of the remaining 25%, resulting in the strip on the pins taking another 25% / 2 x 5 / 8 = 8% weight of the square inch. Totally 75% x 32 / 25.4 + 8% = 102.5% weight of the square inch.


Packaging tape 3/4cm width- 0.4 grams per 45cm


Zip tie 2mm trimmed - 0.4 grams per 3 pcs



Velcro tie 5/8 inch without adhesive - 0.4 grams per 10cm


M2 washers - 0.3 grams

12 pcs. 0.4g x 12 / 15 = 0.3g.

Oxy2 Sport DFC rod set - 0.3 grams

Previous weighing of Blade 180 CFX main hub had 1.4 grams. The DFC rod set is hence 1.7-1.4=0.3 grams.

Molex Picoblade 1.25mm 2-pin connector - 0.3 grams

Each half is 0.6/2=0.3 grams


Molex Picoblade 1.25mm 2-pin Y-split connector - 0.2 grams

0.5 grams set - 0.3 grams socket conenctor = 0.2 grams y-cable


Heat Shrink Tube 2.5mm - 0.2 grams per 7cm

0.6 grams x 7cm / 24cm = 0.18 grams ~= 0.2 grams


Gardening wire - 0.2 grams per 10cm

0.6 grams x 10cm / 30cm = 0.2 grams

M1.6 washer 1.6 x 4 x 0.3 mm - 0.2 grams per 14 pcs

0.3g * 14 / 18 = 0.2 grams

SanDisk 32GB SD card - 0.2 grams


Heat Shrink Tube 1.5mm - 0.2 grams per 10cm


Heat Shrink Tube 0.8mm - 0.1 grams per 7cm

0.4 grams x 7cm / 44cm = 0.06 grams ~= 0.1 grams


AWG 30 Wire Wrapping Wire - 0.1 grams per 15cm

0.6grams x 15cm / 100cm = 0.1 grams.















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