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Building your Drone ANIM4477.01 Day 6

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by

Kevin Finisterre

on 1 December 2014

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Transcript of Building your Drone ANIM4477.01 Day 6

We are building a multirotor airframe
We will discuss, but are NOT building fixed wing craft
We will not cover gas / nitro powered craft
I'll help, but it is beyond the class scope
First we build each of you an Arion
After that I *try* to teach you to fly
Then we struggle to make YOUR designs fly
First we need electrical components: Flight controller, ESCs, motors, BEC, wiring harness, transmitter, receiver, battery, and props
Then we need to get everything all assembled
What are we gonna build?
What do we need?
eCalc? http://www.ecalc.ch/xcoptercalc.php?ecalc
Power & Thrust vs. Weight
Each brand of motor and prop combo will have thrust charts
*SOME* motors can be run out of spec (only claim 3s will do 4s)
KV is RPM vs Voltage rating, NOT 'KilaVolts'!
Lower the KV the larger the prop in most cases
Low KV motors are often in 'pancake' configuration
Low KV usually needs 6-12S (cell) batteries
High KV is good for mini frames with small props
High KV motors are usually small, Low KV can get very BIG!!
Tiny props need to spin really really fast! Large "slowfly" props don't
motors & props combos
Propsize (and in air drag) will impact voltage usage
Prop efficiency will also impact voltage usage (g/W)
Grams per watt is on the spec sheet for the motors
High end carbon vs. low quality plastics for example
How much current can your motor handle?
We go back to the spec sheet for amp / watt usage
Electricity 101 for RC fliers video lays it all out
Fairly complex: Ultimately, you overheat the ESC, overheat the motor, or cause an electrical brownout (thermal shutdown of BEC)
Pusher vs Puller (tractor)
CCW CW - ClockWise & Counter Clockwise
Wood, Carbon Fiber (prebalanced - remove wobble / jello)
DJI vs. Gemfan (bend vs. snap!)
Diameter and pitch differences
Flat props for inverted flight - (Warthox)
Wrong size can cause motor to overheat & fail
Bigger prop draws more current, adds resistance.
Tri fan prop is less efficient
Pitch has a strong bearing on lift and feel in the air
faster shallow-pitch props, or slow steeper-pitch props
http://aerospace.illinois.edu/m-selig/props/propDB.html
Prop size & type
with Kevin Finisterre of Pillar Technology
Building your Drone ANIM4477.01 Day 6
1.21 Giga Watts!?!
Yet another microcontroller...
BEC, & NO BEC variants. (Battery elimination circuit)
Again we go to the spec sheet for amp / watt usage
Similar spec sheets to the motors (match em up!)
Continuous power rating, max bursts, etc.
Different firmware types (SimonK, BLHeli, stock)
Performance gains on some firmwares over stock
Low Voltage Cut Off settings, startup tones
E-braking, governors, tail rotor features (heli) etc.
Programming card, or debug interface, or stick input
Electronic Speed Controllers
Lithium Polymer, not like old school NiCad
When they go dead, they get chemically damaged (<3.3v)
4.2v max and 3.2v min per cell
They get puffy when damaged, due to oxygen buildup
gas discharge is HIGHLY flamible.
Never leave a charging LiPo unatended!!! Charge in LiPo safe
Discharge for storage, don't over charge, etc.
Use a "balance" charger for good health. (balance port)
Impact of crash can cause a small explosion
Do not pour water on a LiPo Fire!
We will talk more on handling when the time comes to use them
2s 3s 4s? What!? Nothing fancy, just the number of cells
Number of cells determines max voltage. 8.4v 12.6v 16.8v
Never let each fall below 12.8v (4s) 9.6v (3s) 6.4v (2s)
Batteries measured in mAh and C (max discharge amps)
mAh is milliamp-hour (one-thousandth amp for 1 hour)
LiPo Batteries
LRS (Dragon Link) Long Range UHF (FPV in Space?!)
Spektrum (Orange)
Walkera
Turnigy (bad potentiomers & failsafe is weak)
Graupner
JR
Futaba
FrSky Taranis (older FrSky had a PPM frame rate issue)
Bottom line is *quality* is key. So is *trust*
Your entire investment rides on this key piece of control
Trainer port?
Transmitter
Last class you broke into groups
I stopped by Fab Lab (prefer .STL files)
Need to add 1 person to one of the 3 person groups (I'll pick)
Sorry my cat ate some of your designs! (No joke)
I need your group 3D files as soon as possible
We will push them to the Fab Lab for a test run
I won't push too hard on this... go at your groups pace
We can also send to Shapeways if you want to pay
If you did not get me a group drawing please do
If you did not get me an individual gimbal drawing please do
I originally wanted a 3d render of your gimbal Wednesday..
Your participation in a group accounts for 10% of your grade
I AM keeping an eye on participation...
Group Project Update
Full transcript