CanSat Rover 2526

Mechanics

Folding

1. Rover

Tires and motors

https://www.vcalc.com/wiki/vcalc/rpms-to-linear-velocity

Diameter 4 cm

RPM	Speed (cm/s)
15	6
30	3.1
Example	Example
68	14.2
381	79.796
Example	Example

Designs

File:Version1.zip

2. Boat / Snowmobile

Idea

Aerosled

With tutorials etc https://www.thingiverse.com/thing:4496127

• XXD HW30A 30A Brushless Motor ESC For Airplane Quadcopter.
  • Weight: 25g
  • Dimensions: 45 x 24 x 11mm
  • Price: 6€
• Racerstar BR2212 2450KV 2-3S Brushless Motor For RC Models
  • Weight: 52g

Power Arduino/ ESP32 from a powerbank. ESP32

• 2.2V to 3.6V input voltage. 3.3V is optimal. Cells around 3.7V (Li-ion) provide ideal voltage. V_in(max) = 12...16V?? The voltage regulator is AMS1117: may run hot if too much voltage.
• 10 mA - 500 mA
• ESP32 incorporates a regulator that steps down higher voltage supplies to a steady 3.3V output. The common AMS1117 regulator can deliver up to 800 mA, sufficient for most applications.

Powering the sensors and external components separately is highly recommended.

Thrust

Pushing force. The mass of the cansat should be 300–350 g.

Waterproofing the axle (driveshaft)

Underwater sealing. A rotary shaft seal. Sealed bearing. Stuffing tube. Water channeling. Stuffing box.

The axle passes through an arrangement called a "gland".

• a wide tube filled with discs of material and grease
• a standard lip seal

• magnetic coupling

Marine grease

• https://robotics.stackexchange.com/questions/150/preventing-leaks-in-motor-shafts-for-underwater-bots
• http://www.building-model-boats.com/model-boat-propeller-shaft.html
• https://seaperch.org/resources/library/#build
• https://www.mechanicalseals.net/
• https://ntrs.nasa.gov/api/citations/19670006352/downloads/19670006352.pdf

for submarines and 3d prints, check Making 3D prints actually waterproof https://www.youtube.com/watch?v=Q8x-mjjT8j4

Turning the motor

Use a servo to turn the motor. Eg

• https://www.thingiverse.com/thing:737588
• https://www.thingiverse.com/thing:2877306