47Views4Replies

Author Options:

Air pump and switch for two model cars to race. Answered

We are making small model cars and hoping to race them at school.

We hope to propel them with air from a bike pump.

What we want to do is race two cars side by side, triggered by a switch that triggers both cars at the same time down a track.

A ready-made kit is expensive and I am hopeful that some amazing person out there could design/make show me (a non-tech person!) how to achieve this.

Many thanks.

Discussions

0
GreenTreestr
GreenTreestr

11 days ago

Thank you jack for the information, I badly need that answer too!

0
Jack A Lopez
Jack A Lopez

11 days ago

Wait... I am getting some signal on muh crystal ball here, and a picture has emerged.

I will attach that picture, and ask, uh, am I close? Is this picture of a PET plastic bottle, with wheels on it, something close to the artifact you are looking for?

I mean, I am guessing you want two of those, plus a mechanism for pressurizing two of them, and launching both simultaneously.

Edit: I am going to edit this post to provide some more information about the attached picture of the "4M Rocket Race Car" kit, by attaching a few more images, which are pages from the manual for this toy, plus some links to free tutorials, including information about how to build a kind of quick-release mechanism, for these water rockets made from PET plastic soda bottles.

First the pictures. I am guessing these are from the offical 4M manual for this toy. I found these pictures being hosted by Pinterest, and they all have a mark from www.NothingButScienceToys.com, a web site not active at the time of this writing, pasted in one corner. One attached picture is for steps D (Operation) and E (Troubleshooting). Another picture is for steps F (How does it work?), G (What's next?), and H (Fun facts.)

Reading the text of steps D through G reveals this "rocket race car" is essentially a variation on of the popular, PET-plastic-soda-bottle-as-water-rocket-toy. The Wikipedia article for, "Water rocket" explains what this is,

https://en.wikipedia.org/wiki/Water_rocket

and so does this excellent tutorial by ScienceToyMaker.org

https://sciencetoymaker.org/overhead-water-rocket-...

which includes links to Youtube videos for each of seven (7) steps.

The "4m Rocket Race Car" is essentially a water rocket, but with wheels on it, so it can roll across the ground.

Launching two of these cars simultaneously, will require some kind of reliable release mechanism.

Step 5 of the ScienceToyMaker tutorial, linked above, explains how to make a pretty good release mechanism. ( I actually built one, a few years ago, following their tutorial.) The ScienceToyMaker mechanism, made from zip-tie ends, arranged in a circle, is based on a mechanism seen in an earlier tutorial, from AirCommandRockets, linked here:

http://www.aircommandrockets.com/construction_9.ht...

Actually, this mechanism with the expanding circle of zip-tie ends, is similar to a "quick connect" style connector, seen on some garden hoses, compressed air hoses, and beer kegs. I mean, if you have seen one of these style connectors, and pondered how it works, then you will see how the release mechanism for these water rockets is related.

4m-rocket-race-car--p01.jpg4m-rocket-race-car--p02.jpg4m-rocket-race-car--p04.jpg4m-rocket-race-car--p05.jpg4m-rocket-race-car--p06.jpg4m-rocket-race-car--p07.jpg4m-rocket-race-car--p08.jpg4m-rocket-race-car--p09.jpg4m-rocket-race-car--p10.jpg4m-rocket-race-car--p11.jpg4m-rocket-race-car--p12.jpg4m-rocket-race-car--p13.jpg4m-rocket-race-car--p14.jpg4m-rocket-race-car--p15.jpg4m-rocket-race-car--p16.jpg4m-rocket-race-car--p17.jpg
0
AussieAlf
AussieAlf

Reply 11 days ago

Hey Jack,
For a non-clairvoyant person, you did well getting that crystal ball up and running...

0
Jack A Lopez
Jack A Lopez

Reply 11 days ago

Well, the signal comes and goes. I swear, most of the time this thing has about zero bars on its signal strength indicator.
;-)

0
Jack A Lopez
Jack A Lopez

11 days ago

You say there is a "ready-made kit" for to facilitate this, uh, propelling small model cars with compressed air.

Could you be troubled to provide this forum with a link, to the makers or sellers of this kit?

The reason why I ask is because I am not quite picturing this, and a link is necessary for me (a non-clairvoyant person!) to see the details of what you are describing.

Otherwise, I might as well just ask a search engine to show me,

"air propelled toy cars race kit"

https://duckduckgo.com/?q=air+propelled+toy+cars+race+kit

Or perhaps ask Youtube that same question,

https://www.youtube.com/results?search_query=air+propelled+toy+cars+race+kit