How much thrust would be required for a rocket reaching an altitude of 100km?

Charles_McG said:

What’s the I_sp of a $50 bill?

Click to expand...

Hi, Charles !

Hmm . . . A "GRANT" will get you an mid-range "I" reload, if you already have hardware . . . LOL !

Dave F.

Charles_McG said:

What’s the I_sp of a $50 bill?

Click to expand...

Several of them could probably be wound up tightly and be used as the grain for a hybrid... well, maybe a micro-hybrid (with a 16g N2O cylinder). That would put it in the low-E range...

cerving said:

Several of them could probably be wound up tightly and be used as the grain for a hybrid... well, maybe a micro-hybrid (with a 16g N2O cylinder). That would put it in the low-E range...

Click to expand...

That’s what I had in mind.

dhbarr said:

Depends on if it's a Black Friday sale or not :-D

Click to expand...

Ha ha! Thanks for the chuckle.

DAllen said:

How much does the rocket weigh? What is the diameter? How many fins?

Thrustcurve has a model rocket sim that will give you an idea as a starting point. Use OpenRocket or RockSim to give you a more accurate idea.

Click to expand...

im planning to use liquid propellant. So openrocket and rocksim I believe would be almost useless.

Ez2cDave said:

Start here . . . It gets worse, from then on !

Dave F.

View attachment 399416

View attachment 399418

View attachment 399417

View attachment 399415

View attachment 399420

Click to expand...

lmao

RocketEnthusiast101 said:

im planning to use liquid propellant. So openrocket and rocksim I believe would be almost useless.

Click to expand...

If you can't get OR to sim a liquid, you should not mess with liquids. Note that I am not saying OR is the right tool here.

Respectfully I suggest you fly commercial solids until you have enough experience to debate the two previous statements.

RocketEnthusiast101 said:

im planning to use liquid propellant. So openrocket and rocksim I believe would be almost useless.

Click to expand...

+1 to dhbarr.
If you have the thrust data for this liquid propellant motor, then you can use these simulators. If you don’t have, or can’t measure, the thrust data of this motor, then you won’t be launching it any time soon!

RocketEnthusiast101 said:

im planning to use liquid propellant.

Click to expand...

What propellant ?

What oxidizer ?

Cryogenic ?

Hypergolic ?

Monopropellant ?

Dave F.

Can you tell us about yourself and your experience and what you want to accomplish?

This entire conversation doesn't seem proper.

Ez2cDave said:

What propellant ?
...

Click to expand...

Personally, I would start with water and work up from there.

It is hard to tell who is winding up who in these threads. OT1H, this. OT2H this. In my more generous moments, I am inclined to think that posts like those from the OP are intended to be provocative. But I also spend a lot of time around 18-25 year-old engineering students who really do not know how little they know -- or how little they understand the things they think they know.

RocketEnthusiast101 said:

Hi. How much thrust would be required for a rocket reaching an altitude of 100km and also what set of formulas should I be using?

Click to expand...

About this much . . .



Dave F.

jlabrasca said:

It is hard to tell who is winding up who in these threads. OT1H, this. OT2H this. In my more generous moments, I am inclined to think that posts like those from the OP are intended to be provocative. But I also spend a lot of time around 18-25 year-old engineering students who really do not know how little they know -- or how little they understand the things they think they know.

Click to expand...

Ill admit I am one of those engineers and I see it in my friends as well though I do understand that I don't know everything and as a result I tend to ask a lot of questions, some that may come out like this (though not this extreme). Its just that we are at that age of beginning to truly understand things and we want to push the boundaries.

Final answer to the original question. You will need 1 lb more than the weight of rocket in total thrust of the rocket to meet any altitude requirement you desire.

levity.............


Tony