Flight Simulation Files: / landing-model-ep-21536838 Landing Model Rockets Series Playlist: • Landing Model Rockets ... Music by Joe Barnard For more info: / joebarnard www.bps.space
@@RocketSteve That's incredibly minor. For people that sit on their ass all day, I guess it's important to be a fanboy of a particular system. In the real world, where I live and work, we use both systems when we have to and do the simple math to convert measurements, multiple times a day, every day.
@@georgianbents Clearly not with that reply. Perhaps you need to get out more, if I interpret your tone in the right way! Please don't cast aspersions on others from your 'real world'. Lighten up. The comment is light hearted.
Boo metric system! Go freedom units!! Lol no,... but seriously I got an 8lb rocket, so I need an 8lb motor to lift it up, and a 16lb motor to accelerate up at 1 G. I got a 3.9 kg rocket, so I need a ... something kg rocket motor, wait it's newtons for rocket motors, and a netwon is something, let me look back to childhood, oh yeah 9.8 newtons is a kg, so roughly 10, then I need a 39 newton motor And here's a copypasta from something I wrote a while back: The METRIC system makes no sense. What the heck is a Pascal? A mouse fart? Hey, this thing is pressurized to 69,000 Pascals. Wow! I have no concept of numbers that big. That sounds like a lot! Other guy: Actually, no that's not that much at all. This tire has 420,000 kilopascals of pressure. Me: okay, whatever that random dude's name's unit and number that is. Whereas psi is simple! Oh! I know exactly roughly how strong that is. And I can easily estimate how much force that would push on something with. I know how strong an air piston would be with that pressure, how big an object an air bag could hold up, how hard that would blow on me. And water pressure. Yeah that depth the water has this many psi. Yeah, I can estimate how strong that is. Metric: Ah, it's this many pascals. Okay how hard does that push? well if its a newton per square something and a newton is 1/9.8 of a kilogram, and the area of my hand is 0.0069420 of a meter, so it would push this hard on my hand... carry the two... It's just absurd. A Tonne. Or a Ton. Ah, I see, taken later from the imperial Ton just to confuse people even more and more on which one you mean when you say or spec for something. What the heck is a Newton? Ah, you see, you have to do some quick mental math and calculations to estimate how much force that is and how much mass something has or how much weight of objects or mass that much tension or force could lift. This car pushes with 40,000 newtons. Okay, what does that mean. Hey Honey! I'm home! Oh and I picked up 24 newtons of beef at the store today! Torque. I need to put together this thing. How tight should I tighten this bolt? So I don't strip it, or the material, or under tighten it so it comes loose later? Ah, well This one about 10 foot pounds, and this bigger one about 40 foot pounds. Oh, okay, I have this socket wrench that's about a foot long, so I need to pull on the grip with about 10 pounds of force. I'll pull about the same amount as a 10 pound dumbell. Or, my cat is 10 pounds, so the same weight as my cat. Then this one with the fore of a 40 lb dumbell. In metric its Newton meters. A newton, which is a small force I can't estimate, and a meter which is a huge wrench or socket or anything that nobody has. So this needs 20 newton meters. Okay I'll pull on it about as hard as 23 newtons if I had a meter long wrench and estimate that in my head. okay, I need to do some calculations quick to actually figure out that much, my wrench is 0.305 meters long, and a newton is 1/10th of a kilogram, so then I have to divid the torque by about 3 or 4, no wait it's multiply by about 3 or 4, then divide by 9.8, then that's 7.13 kg, what the heck roughly weighs that much, okay i've never picked up a 7 kg weight before, so then okay, a mid sized small dog, but not too small, and not the bigger sized small dogs... Also, bolts. An m6 is too small for the thing I need, but an m8 is waaay too ridiculously big, and nobody makes m7s, and the hole is too big and my plate needs a bigger ring around the hole to be strong enough now that the hole takes up so much space close to the edge, no now it cuts into my plate too much if I move it in, and an m10 is WAAAyyy too big for pretty much all applications except a car suspension, But imperial I have so many options to hold things together. And it's all base 2 fractions, which we should all know. 1/4, 5/16, 3/8, 7/16, 1/2 inch. Ah yes, a thou. This thing is 6 thou thick. Ah, yeah a thou is the width of a human hair, so I can estimate that. This thing is 0.0869 mm thick. Okay, so ... really small? The base unit for mass isnt even a unit, its a thousand units. oh this unit of measurement is about 1000 of these tiny units. I'm making a rocket. This thing weighs 1 lb, this weighs 5.5 lbs, this weighs 2 lbs. Okay, so I need an 8 lb force rocket motor to lift that up, and 17 lb rocket motor to lift it up at 1 G. metric. This weighs 465 grams, this weighs 2.9 kg, this weighs 800 grams. Okay, so I need to 2.9 plus 0.8 plus 0.48 is ... like... 4.3 kg. So I need a rocket motor that can push with 4.3 kg force to lift up, oh theyre not measured in that I need a rocket motor that can push up with ~43 Newtons to lift, and 86 Newtons to accelerate up at 1 G, Oh wait I need to add a 1.365 kg thing to it, now how much is that.... A weird fancy land where they have no sense for anything between two extremes of a meter, whatever that is, and a centimeter. Me: Oh yeah, that things like four feet tall. Bri'ish person: Oi! That things like 1.28 meters tall! Me: That buildings two stories, so then it must be around 20 feet tall. Bri'ish wanker: Oi mate! That buildings 2 stories so it must be around 6.72 meters tall! six story building, 60 feet tall. European 6 story building, 6 times 3 point something, remember my times table... like 18 or 19 point something meters.
Nice work ! What about the evolution of the mass of the rocket because of the fuel being burned? When the second motor is ignited, the rocket is maybe 30g ligther. After all you're going to make a rocket so use the rocket equation :)
Not all the way through the video, but only the motor's propellant mass should count in the "wet mass" section!!! The motor casing is NOT wet mass!!! Loved the video
You think that the metric system is the best and have the same scale as me, you really drawl me in. Excellent video and I'm looking forward to the next videos in the series.
Hey I think there is a small error in your math. The integral of force is momentum. The integral of acceleration (or force divided by mass) is velocity.
There are really cheap and available miniaturized CO2 tanks out there for paintball guns. You could probably use those to as cold gas thrusters no muss no fuss.
i agree the metric system is better when measuring thing I prefer cm to inch and stuff but for degrees i prefer F instead of C i can read C but i need to first convert it in my head to F which takes about 3 seconds but its annoying but i can do it
📺💬 Before continuing press like, all parts are designed with balances open / clone parachutes sample combined into a model. 📺💬 Impulse ranges B had twice of impulse as A and C had double the impulse as B . 🥺💬 You are correct all parts are well designed not powerful only but continuity smaller impulse or hard contrast force. 📺💬 We have some calculations here, 3.1 seconds is a good burn time which is gravity force. 📺💬 A block diagram in MATLAB Simulink we can build a simulation of thurst feedbacks system because you need to control the continue force apply to an object and response to the environment. 🥺💬 That is one hard part not only the simulation plotting but solution when you build system that Automatic control the engine .
If you want to know how many Newton’s your rocket is or how much it’s “weight” us F=mg g being 9.8 so before any ejections this rocket is being held down with around 8.3 Newtons and so a rocket motor with an average thrust of 11 wouldn’t do much. You can do more math to figure out what the acceleration would be but with .8 seconds and 8.3 Newtons to lift he’s right not the right motor. Just find out your acceleration account for the time and you can approximate V to and where the apogee will be which is where V = 0 until it starts accelerating down at -9.8 but quick parachutes !
No, sir, The METRIC system makes no sense. Go Freedom Units!! What the heck is a Pascal? A mouse fart? Hey, this thing is pressurized to 69,000 Pascals. Wow! I have no concept of numbers that big. That sounds like a lot! Other guy: Actually, no that's not that much at all. This tire has 420,000 kilopascals of pressure. Me: okay, whatever that random dude's name's unit and number that is. Whereas psi is simple! Oh! I know exactly roughly how strong that is. And I can easily estimate how much force that would push on something with. I know how strong an air piston would be with that pressure, how big an object an air bag could hold up, how hard that would blow on me. And water pressure. Yeah that depth the water has this many psi. Yeah, I can estimate how strong that is. Metric: Ah, it's this many pascals. Okay how hard does that push? well if its a newton per square something and a newton is 1/9.8 of a kilogram, and the area of my hand is 0.0069420 of a meter, so it would push this hard on my hand... carry the two... It's just absurd. A Tonne. Or a Ton. Ah, I see, taken later from the imperial Ton just to confuse people even more and more on which one you mean when you say or spec for something. What the heck is a Newton? Ah, you see, you have to do some quick mental math and calculations to estimate how much force that is and how much mass something has or how much weight of objects or mass that much tension or force could lift. This car pushes with 40,000 newtons. Okay, what does that mean. Hey Honey! I'm home! Oh and I picked up 24 newtons of beef at the store today! Torque. I need to put together this thing. How tight should I tighten this bolt? So I don't strip it, or the material, or under tighten it so it comes loose later? Ah, well This one about 10 foot pounds, and this bigger one about 40 foot pounds. Oh, okay, I have this socket wrench that's about a foot long, so I need to pull on the grip with about 10 pounds of force. I'll pull about the same amount as a 10 pound dumbell. Or, my cat is 10 pounds, so the same weight as my cat. Then this one with the fore of a 40 lb dumbell. In metric its Newton meters. A newton, which is a small force I can't estimate, and a meter which is a huge wrench or socket or anything that nobody has. So this needs 20 newton meters. Okay I'll pull on it about as hard as 23 newtons if I had a meter long wrench and estimate that in my head. okay, I need to do some calculations quick to actually figure out that much, my wrench is 0.305 meters long, and a newton is 1/10th of a kilogram, so then I have to divid the torque by about 3 or 4, no wait it's multiply by about 3 or 4, then divide by 9.8, then that's 7.13 kg, what the heck roughly weighs that much, okay i've never picked up a 7 kg weight before, so then okay, a mid sized small dog, but not too small, and not the bigger sized small dogs... Also, bolts. An m6 is too small for the thing I need, but an m8 is waaay too ridiculously big, and nobody makes m7s, and the hole is too big and my plate needs a bigger ring around the hole to be strong enough now that the hole takes up so much space close to the edge, no now it cuts into my plate too much if I move it in, and an m10 is WAAAyyy too big for pretty much all applications except a car suspension, But imperial I have so many options to hold things together. And it's all base 2 fractions, which we should all know. 1/4, 5/16, 3/8, 7/16, 1/2 inch. Ah yes, a thou. This thing is 6 thou thick. Ah, yeah a thou is the width of a human hair, so I can estimate that. This thing is 0.0869 mm thick. Okay, so ... really small? The base unit for mass isnt even a unit, its a thousand units. oh this unit of measurement is about 1000 of these tiny units. I'm making a rocket. This thing weighs 1 lb, this weighs 5.5 lbs, this weighs 2 lbs. Okay, so I need an 8 lb force rocket motor to lift that up, and 17 lb rocket motor to lift it up at 1 G. metric. This weighs 465 grams, this weighs 2.9 kg, this weighs 800 grams. Okay, so I need to 2.9 plus 0.8 plus 0.48 is ... like... 4.3 kg. So I need a rocket motor that can push with 4.3 kg force to lift up, oh theyre not measured in that I need a rocket motor that can push up with ~43 Newtons to lift, and 86 Newtons to accelerate up at 1 G, Oh wait I need to add a 1.365 kg thing to it, now how much is that.... A weird fancy land where they have no sense for anything between two extremes of a meter, whatever that is, and a centimeter. Me: Oh yeah, that things like four feet tall. Bri'ish person: Oi! That things like 1.28 meters tall! Me: That buildings two stories, so then it must be around 20 feet tall. Bri'ish wanker: Oi mate! That buildings 2 stories so it must be around 6.72 meters tall! six story building, 60 feet tall. European 6 story building, 6 times 3 point something, remember my times table... like 18 or 19 point something meters.
Just a quick question: do you have any plans to add a sensor for altitude measurements? I know SpaceX uses radar. Also, any plans to add throttle control with two 2-axis motor gymballs?
You should be able to add the drag force to your simulation. You have all the parameters you need except drag coefficient. Just estimate it. It will be a much better simulation that way.
+BPS.space This would make it possible to time the delays pretty much on point and reduce the test runs. The math is not that hard either. This is probably a fun way of over engineering the rockets. Would love to see it
BPS.space the block diagram (@ 14:10) of the simulation has an error. Velocity can not be achieved from Net force directly, You should take Net force/mass as input for the integrator (for getting velocity).
Have you considered using reloadable CTI or Aerotech motors? I'm not sure what the benefits might be exactly, considering your usage but in my experience they are generally more reliable and stuff
Thank you Joe for taking the time to explain the concepts while doing your interesting development work. Can you format your columns to display 2 or 3 decimal places as the case maybe, it will help with scanning your columns for any keyboard entry errors?
Is dropping from a meter up acceptable? I'd be quite amazed if it could stick a landing after a meter freefall. Another question: how will you burn the landing motor after the ascent motor has fired? Will the ascent motor be jettisoned?
Variable thrust control? These motor burns are relatively constant when they fire, after the initial thrust. Can altitude sensor and velocity sensor combine to adjust the thrust to ensure that the thrust burns at just the right rate to achieve a suitable velocity immediately prior to landing? Is there a way to control the output of the thrust of the retro motor so that it performs dynamically?
Could this be done with energy to calculate when to fire the motor? You have the energy of the motor and you can then calculate what the height of the rocket is for PE and you know its speed for KE so you just fire the motor when the potential energy plus the kinetic equals the motors energy?
I don't know if I'm right, but why you don't divide the integrated force signal by the mass? If you want to get a velocity you have to integrate an acceleration not a force. I will be grateful if you explain me this :)
hello how's it going ?, I'm watching the series and the truth is that I am very interested in everything but there is a small problem that I see with the subtitling in Spanish that RU-vid gives you automatically, it is a great series and it would be much better if there were a format to Spanish you would have many visits. Thanks for your attention
Instead of going by time (to initiate the rocket for landing) can't you install some kind of mini-radar on the rocket to initiate at a given distance from the ground?
BPS.space do you know any thing about making your own rockets and what dimensions you’d have to use in a homage casing to get thrust out of your propellant
