CanSat Rover 2526: Difference between revisions

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== 1. Rover ==
== 1. Rover ==
=== Tires and motors ===
https://www.vcalc.com/wiki/vcalc/rpms-to-linear-velocity
{| class="wikitable"
|+ 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|thumb|Version 1]]
=== 1 ===
=== 2 ===


== 2. Boat / Snowmobile ==
== 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.
Motor options
* BetaFPV 19000KV Motor (7x16mm), 2.95g, 3.7V
=== Thrust ===
The thrust coefficient, <math>C_T</math> measures how much thrust a propeller makes compared to the air pressure it faces.
<math>
Thrust = C_T \times \rho \times A \times (\omega \times r)^2
</math>
{| class="wikitable"
|+ Example
|-
! Header text !! Header text !! Header text
|-
| <math>C_T</math> || 0.12 ||
|-
| <math>\rho</math> || 1.225 || kg/m³
|-
| Propeller area <math>A</math> || 0.0314 || m²
|-
| Angular Velocity (ω) || 314 || rad/s
|-
| Propeller Radius (r) || 0.1 || m
|}
Pushing force. The mass of the cansat should be 300–350 g.
# RPM. More RPM => more thrust.
## KV: How fast the motor spins per volt.
## Voltage
#Propeller
# Diameter <math>d</math>
# Pitch
#Motor efficiency
Thrust (in grams):
<math>
= 4.92 x (Propeller Diameter in inches)^2 x (Propeller Pitch in inches) x (Motor KV)^2 x (Battery Voltage)^2 / 1,000
</math>
=== 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
=== 1 ===
=== 1 ===
=== 1 ===


== Radio Communications ==
== Radio Communications ==

Latest revision as of 19:43, 9 December 2025

Introduction

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

1

2

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.

Motor options

  • BetaFPV 19000KV Motor (7x16mm), 2.95g, 3.7V

Thrust

The thrust coefficient, measures how much thrust a propeller makes compared to the air pressure it faces.

Example
Header text Header text Header text
0.12
1.225 kg/m³
Propeller area 0.0314 m²
Angular Velocity (ω) 314 rad/s
Propeller Radius (r) 0.1 m

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

  1. RPM. More RPM => more thrust.
    1. KV: How fast the motor spins per volt.
    2. Voltage
  2. Propeller
  3. Diameter
  4. Pitch
  5. Motor efficiency

Thrust (in grams):

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

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

1

1

1

Radio Communications

Land Station

Prelaunch report

Outreach plan

Other

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