Let's Make Robots!

Rocket car v2

Run fast
AttachmentSize
rocket_car_program.bas231 bytes

This is my second rocket car, designed with Google Sketchup. The image below is additional rendered with Inkscape (also freeware):

All wheels will be ball bearing mounted:

The front fins should increase the surface pressure of the front wheel at higher velocity.

The rocket car will be propelled by four C6-0 model rocket motors, technical data listed below:

Total Impulse: 8.82 newton-seconds

Peak Thrust: 14.09 newtons

Burn Time: 1.86 seconds

Average Thrust: 4.74 newtons

Propellant Mass: 10.8 grams

 

A FlyCamOne eco V2 will be added, pivotable by a micro servo. The camera weighs only 17g. Start/stop, mode and 180°Rec-Flip can be controlled by a servo signal.

Construction work details...

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

and the finished rocket car:

Due to the bearings the rocket car runs very smoothly. It rolls a few meters on even surface if you give it a love tap.

 


 

2010.9.15

Small update. Mounted the servo for the camera, the battery, launch wires and luster terminal.

 


 

2010.9.20

Igniter test with connected control board:

Video to jpg converter are really cool. You can study motion sequences.

It appeared that not all 4 igniters started to burn at the same time. These cheap igniters are not made for simultaneous ignition.

 


 

2010.9.22

Controller board (Picaxe 08-M) and RC ignition are working now. Camera mounted on the servo.


2010.9.24

Rocket car finished and ready to launch. Stay tuned for the video...

 TBC

Comment viewing options

Select your preferred way to display the comments and click "Save settings" to activate your changes.

They sell all the stuff you need to make the fuses etc at: http://www.cavemanrocketry.com/index.php

Hey Markus,

try pumping up the voltage that you sent through the ignition. I had a similar effect when igniting these fuses, at lower power they tend to heat up slowly before they ignite. With a higher voltage it happend instantly!

Hi DutchBot,

Yes, the effect getting smaller if you increase the voltage, but still not simultaneous. The resistance tolerance of the igniters is too big. The effect should be not a big problem for the rocket car but maybe for a model rocket if you bundle more than one rocket motor. Thought already to measure the resistance of every igniter by an micro controller and control then also the ignition by according shorter or longer time delays.

I have no clue, but just a thought; If you gave each 2, or 3 igniters, you'd get more of an average time..

Hmm, but there fit only one igniter into one rocket motor :)

This happens within 0.12 s:

That looks super cool Markus. Can't wait for the video!

Thank you is it avallible in the united states

How much does the mini camera cost it's not on the website

The longer the better at high speeds, much more stable than a short one.

 

PS: you can make your own electric igniters with steel wool :)