Marklar 7, New Step in Pnewmohudralic Jet Machines

1,171

10

More than a year ago I have done Marklar 3, the jet vehicle with a hybrid engine. The idea was so simple and effective that it was asked to make more and deeper. ( If you do not go by the link, this is the idea. I use in a pneumatic jet engine carburetor, that makes a mixture of air and water, that has a higher density than air, and lover viscosity than water.)

After analysis of the video, I saw a few problems:

- vehicle was unstable during the move, while acceleration it cal lay in drift and lose speed.

- during acceleration, some water overflow to the back of the vehicle and it lose air, mean energy for moving.

To fix this to problems I decided to spread the air tank and water gallon and make suspension and automatic for direction stability.

I hope this will increase the speed. Answer at the end of the article.

Teacher Notes

Teachers! Did you use this instructable in your classroom?
Add a Teacher Note to share how you incorporated it into your lesson.

Step 1: Materials, Instruments

Hard to say what I use while building a vehicle. Maybe, will be easier to say, what I not use.

Shortlist of materials:

- Plastic bottle on 2.4 litter.

- hand juicer.

- a lot of wooden coffee mixers (for suspension).

- different plastic pipes.

- valve.

- wooden pieces, which can't hide from me.

- 3 wheels from roller skates.

- Arduino leonardo and accelerometer.

- bicycle nipple (Presta).

- set for a dropper.

and a lot of instruments.

Step 2: Engine

I don't have a 3d printer. Maybe, someday I will create some on 3d printer, but, before I create in 3d model theory of this model have to have approval. So I decided to make the main engines chamber melted together two bottlenecks.

It's an easy and simple method creating chambers with small volumes.

I connected all like shown on the scheme.

Step 3: Suspension and Frame

The frame I build with some wood and wooden coffee mixers. The idea is very simple, use these sticks like springs.

Step 4: Arduino and Me

I ordered Arduino, mpu 6050 and servo, search in internets how to use it.

Firs problem was "How it all starts, I don't have any button or something". But, I find out that it starts after it gets power.

I found the article, which tells how mpu 6050 works, and write my own program.

Step 5: Rudder Cables

For rudder cables I use strings.

The same serv managed thrust direction and wheel.

Step 6: Testing One

While the first testing vehicle shows low speed (11 km/h). But self-direction correction works.

After a short analysis of construction, I find out the reason why speed so slow was the ру t-like splitter. Because of it, I lose a lot of speed of air.

Step 7: Bug Work and 7 Atmospheres Explosion

I decided to take away the t-like splitter. And during the first test bottle increase longitude for more than an inch. At that moment I don't pay any attention to that, but later I understand where it went, too late.

After a few manipulations vehicle was done, and I decided to make a "dry start" at home. It means without water.

During the second pumping, the bottle exploded at 7 atm. For big luck, nobody has an injury, except for the vehicle.

Explosion ruin suspension and place for buttery.

The buttery place I don't fix. I place buttery with a tape.

To protect the bottle I use the duct tape. And It works.

So, I protect the bottle, mace off a lot of "bottlenecks".

Step 8: Testing Two and Сonclusion

Main testing. Unfortunately, speed increases only to 15,5 km/h (the highest result). Almost twice slower than the previous vehicle.

And I think I guess why.

I try to increase jet impulse by increasing the mass of working mass by increasing outlet (was 2 mm to 4 mm). And to my realization it wrong way. To understand how to do it write I have to learn a theory about the viscosity of gases and mixtures. And find the golden middle between the density of working mass and outlet.

Second Prize in the
Make it Move

2 61
37 22K
53 2.6K