# Questions tagged [model-rocketry]

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### How can I find the predicted approximate altitude of a rocket based on simply the propellant, specific impulse, and propellant mass?(solid propellant) [duplicate]

I am getting all the inputs I outlined above, including burn-time which I could not mention above(character limit), from a small scale motor test. I know there are specific specific impulses for each ...
1 vote
214 views

### How to find the average ambient pressure during rocket ascent?

I am trying to find the average ambient pressure that my rocket will flight through during its ascent to then determine the most optimum conditions in my combustion chamber and nozzle. I have ...
842 views

### how would a multi stage model rocket work? [closed]

I want to make a three stage model rocket. But I don't know how I would detach the used stages. I was thinking of using a remote control would that work?
1 vote
219 views

### Average acceleration of a rocket given average mass and thrust

If we assume that a small scale rocket is launched perpendicularly to the ground and ignore the drag, how can I calculate the average acceleration given that I know the burn time, the average thrust, ...
• 65
147 views

### Federal Limitations on Model Rocketry in India

I am hoping to find information on the rules regarding model rocket launches in India. How high can I fly? How heavy can a custom rocket be? Can I legally make and fly custom engines/motors?
937 views

### PID Controller for Thrust Vector Controlling of High Power Rocket [closed]

We are trying to design a Thrust Vector Control system for a High Power Rocket using PID Controller. Can anyone guide us what approach should we use to create this Controller? Rocket Details: Mass: ...
• 361
129 views

### How to determine altitude when altimeters fail?

Specifically for high altitude amateur rocketry, how is altitude determined when you get too high(too low pressure) for barometric altimeters to work? I heard about GPS, however, COCOM limitations ...
1 vote
737 views

### What is an "M motor"? (used in a full-scale model of a Corporal missile)

The NASA JPL video Corporal: America’s First Guided Ballistic Missile shows that it used an Acid/Analine engine. That would have been both challenging and unpleasant to reproduce. So instead, the ...
• 149k
1k views

### Testing flight characteristics before actual flight in model rockets?

I do a lot of scratch design/building of model rockets, but one of the things that I've struggled with is testing the models I come up with. Some of them are purely intended to be static display ...
• 271
158 views

### How much does model rocketry prepare for an actual career in rocket design?

I have been doing model rocketry for years, both the premade kits from Estes (and others), and doing scratch design as well. Some of these have been successes, and others, well, not so much. I have ...
• 271
3k views

### How can I measure the thrust of a model rocket and get other statistics

I have been building some Rocket-candy engines for fun, and informally experimenting with different designs or techniques. Now I'm interested in figuring out a way to compare the performance of the ...
• 167
163 views

### Can a DIY rocket put an object into a stable orbit around earth? [duplicate]

Is it possible for a "home made" rocket to launch an object into a stable orbit assuming a person has calculated the right trajectory?
2k views

### What is the cost of sending a small payload to space? [closed]

What is the typical weight of the propellant required to send a tiny armature rocket into orbit? What is the cost of such a small rocket in today's dollars?
• 21
4k views

### Are there commercial rockets with fins?

Pretty much all model rockets have fins for stability, but when I think about it, I can't seem to come up with a full scale, commercial or government rocket that has fins. I'm probably forgetting one ...
• 271
2k views

### Are cold gas thrusters viable for model rockets?

Lately I've been exploring the idea of cold gas thrusters, or in this case cold gas rocket engines, to be used in model rockets. I've read that nitrogen gas can get 73 seconds and helium can get 2.5 ...
• 4,556
574 views

### Why won't this configuration of fins work?

So I was building a rocket. I tried to find a more efficient way of attaching the fins. So then I realized how easy it would be if I just attached them like this: So instead of having the fins ...
• 519
1k views

### What factors are influencing a woosh rocket?

I asked this over at Physics, but no one seemed to know, so I'll try here: If I fill a plastic bottle with a small amount of rubbing alcohol, shake it around and hold a match to the bottle neck, I'll ...
3k views

### How to seal the connection between the combustion chamber and outer shell in this rocket engine model?

Here is rocket engine drawing. The combustion chamber made from copper and the outer shell from stainless steel. The coolant, either water or gasoline will be between (source: wonderhowto.com) With ...
• 604
2k views

### What is the delta-v range for model rockets?

I'm curious about the delta-v of model rockets. While searching the web I found NASA's "For Educators" page How Do Rockets Stack Up that was going to cover it, however the stats haven't been filled in....
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