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

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Can you give us an idea of how long the rocket burst is......?

....and will you detonate all together or each timed in a chain ?

I ask this because you seem to have gone through a lot of trouble to make it pretty sturdy.

Last Question :- what is the easiest way to ignite (safely)? - ie by electric means..........(i have a few mini ones up my sleeve but to afraid&unsure at the moment how to ignite them).

Hi Gareth,

Technical data of C6 engine:

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

I'll ignite all engines at once.

The safest way to ignite rocket engines is by an electrical igniter:

 

A ha , I can see you are going for speed then.....

Do i calculate that the wheels will only just be in contact with the floor as it skims or aqua-planes the dust.....

Will this be controllable in any way?

I'm planning to add a camera and remote control the ignition. Additional suggestions welcome :)

Computer aided RC Rudder?

Hm, it's dedicated to run straight. Course correction?

Your first / original Rocket Car did not excactly run straight.. But this one should? Because it's longer?

Yes, I made a few minor changes: Bigger rear fin, no independent suspension for rear wheels, longer body, bigger diameter of the rear wheels, smaller distance between the rear wheels and I will also add a front fin to avoid the car will become airborn.

Hmm.. Personally I'd add a front fin to _make sure_ the car will become airborn :D

But that's just sily me!