Hi! I am Shresth a freshman at my local university in India. I have initiated a rocketry club. It's great to watch people like you, as it inspires all.
Hi! I'm the president of TU Darmstadt's rocketry club and I really liked your project! We started out with a very similar rocket flying an H-motor as well, but packed our own flight computer as well as a sofisticated recovery system which I can highly reccomend! Also, make sure that during descent under parachute your chute lines don't get tangled up because your rocket will most likely enter what's called a flat spin. Last month, we launched our latest rocket to a height of one kilometer and deployed three payloads - I hope you're planning something similar! It is a ton of fun, let me tell you.
Awesome! Nice work. Rice Eclipse is building a rocket for Spaceport America this summer. It'll be much larger than the rocket in this video and fly to an altitude of 30k feet. We've built our own hybrid motor for it and are very excited to see it fly.
loved it!! I did my L1 on an H550. It burns for 0.5 seconds and produces 550 newtons of thrust in that short burn time hahaha. My rocket held up great. For my L2, i used the same rocket with a J270 motor and single deploy. However, on the second launch, the motor exploded 2.25 seconds into flight. It separated my booster from the upper airframe, feel 5300 feet and was recovered without a scratch hahaha. Only a broken shock cord :) My L1 and L2 were done with no electronics, however, my L3 we had redundant dual deploy, but my team launched without me and forgot to hook the electronics up so it came in ballistic from 10,000 feet......
Wow! That sounds like an interesting flight record. I'm glad the L1 went well. Sorry about the L2. CATO's are rare with manufactured motors, but it's very frustrating when it happens. How did you keep your L2 from drifting too far with a single motor deploy? I've been working on an L2 design, but increasingly find a drogue necessary to prevent drift. An L3 sounds like a daunting challenge. Sorry it went ballistic. Good luck getting your L3 certification.
@@GravitonMedia thanks :) Pick the lowest L2 motor you can find. Thats how you prevent drift. Also add weight to the payload section in open rocket and sim it. I added a couple of bags of black beans to my rocket. Kept it low and slow and the extra weight helps it drift down rather than at an angle. Might land a tad harder, but my rocket was fine The j 270 is a lower end L2 motor, but i still had to walk half a mile to get it. Oh, and if its a slightly windy day, you will have to keep an eye on it. Take binoculars and a ATV if you have one. All in all, my L2 disnt drift very far since it was a low power3d motor and i had a couple bags of black beans in the payload section to add drag and weight.
Great video with the basics! Certification is important but it's a funny in a way to me, let me explain: I'm Brazilian, so rocket parts and motors aren't for sale here. There isn't a Tripoli prefecture, so I can't feasibly get a certification. But, I'm in a college rocket team, and we managed to design (everything, including the motor!), build, fly, and recover with no damage a rocket that went slightly below 10k ft last week on Spaceport America Cup. The event demanded everyone to be associated to Tripoli, for their insurance. Here's the funny part: everybody is a Level 0!
That's interesting. I didn't know Brazil had those regulations. My team was at Spaceport, too. Rice Eclipse Rocketry Team. I wasn't able to go myself, but maybe you met some of my friends there :)
Thank you for the well-wishes! I'm glad you enjoyed my video. I'm planning to build and launch an L2 rocket this spring, so I'll make a video about that as well.
6:20 Technically, it is lift, not drag. 8:05 The average thrust is constant, 255 N. The instantaneos thrust varies throughout engine firing. Great video, thank you for it.
Great video. I want to get started in rockerty myself but not sure if it was legal in my country. But after seeing this video and doing a bit of research i found out it was!
That's great to hear! Definitely pay attention to motor-purchasing requirements and height ceilings. In America, those are the two areas with the most regulation, but you can do both with the proper certifications and waivers.
Congratulations!! I am currently on the design journey of an L1 attempt rocket too and this video inspired me to try harder even more!! P.S. what's the diameter of the airframe of Vulpes?
Thanks! The Vulpes had a diameter of four inches, which was definitely overkill for an L1 in retrospect. You can get cardboard tubes on Amazon that have diameters of 4in, 3in, or 2.5in. All of those work pretty well for L1s.
For L1 rockets, the best way to do that is to simulate your rocket on the program OpenRocket. This will give you predicted values for apogee and time of flight, which you can use to determine the optimal delay time (just after apogee is best).
Sure. Here's a link to the OpenRocket file that has all the relevant dimensions: drive.google.com/file/d/1LGcFyVThF15gDpPeObEHJWtwBjVWKXXZ/view?usp=sharing
I don't like sharp cones, the breaking of the air should be gentle, clean air is better for moving fast through it. Do you ever launch dolphin or tuna shaped cones?
Nose cones with rounded ends are preferred for subsonic rockets; supersonic rockets perform best with pointed cones. There are a number of research papers on this.
Hi great video, I'd like to know where you get your rocket supplies especially the body and nosecone. Also if you could explain how a reloadable motor works and where you can get propellant from I'd be very grateful. I'm trying to get into this type of amateur rocketry and I don't know where to start or get things.
Hi there, we get the body tubes from BOX USA, a company that makes poster mailing tubes. We get the nose cones from Apogee Rockets. Reloadable motors have reusable casings with new fuel inputted each time. You just have to buy new fuel each time.
That's going to depend on which model of G motor you're looking for. Is it Cesaroni, Apogee, etc.? If you don't know that yet, you can try this online store to see what suits your needs: www.hobbylinc.com/g-model-rocket-engines
I'm happy to follow your video, but I have a question and I hope for the answer: how to define the center of thrust of the rocket, before it slips into the fuselage of the mini rocket ??? please answer
That depends on the motor. The Cesaroni H255 I used was a one-time use motor, so it would have to be replaced with a new motor after each launch. On the other hand, a motor like AeroTech H128 has a reusable casing, and just the fuel needs to be swapped out after each flight. For a beginner, the one-time use motors are simpler to assemble, as their fuel components are not detachable since they aren't meant to be swapped out. Reusable motors can be more complex since you have to work with the motor internals. Hope this helps. Happy rocket-building!
Probably not. The issue with an AirTag in particular is that it doesn't actually use GPS tracking. Instead, the AirTag uses Bluetooth connections to nearby Apple devices to determine its location. For instance, if you drop your wallet in a busy parking lot, the AirTag will determine its location by connecting to the nearby phones of passersby. For the typical use-case of AirTags-finding misplaced keys, wallets, and other household items-this works fine. When it comes to rocketry, launches typically occur in remote rural areas, and the rocket is unlikely to land close enough to any other Apple devices to pick up the short-range Bluetooth signal. Thus, an AirTag would not be reliable for recovery. You want to use a tracking device that has GPS capabilities. Thankfully, most GPS trackers are in a similar price range to Apple AirTags, about 30 bucks.
@@GravitonMedia Wow, The fact you took your time to help me on thhis means alot. I really appreciate the response, You earned a subscriber! What GPS do you recommend I use?
Thank you for subscribing! I actually haven't used a GPS in my rockets yet. My team at Rice University uses Telemegas and Raven Blues for altimetry data. I think those companies might sell GPS as well, so that would be the first place I would look.
7:35 Ah, sorry. I see that's a mistake in the graphics there. It's 40,000 Newton-seconds, not 40,000 Newtons. Newton-seconds are a measure of total impulse, or change in momentum. This means that an O-motor can change the momentum of a rocket by 40,000 Newton-seconds. If delivered in one second, that would be an average thrust of 40,000 Newtons, but O-motors typically take five seconds to completely fire, for an average thrust of 8,000 Newtons.
I didn't use an O motor. I used an H motor. A Cesaroni H255 to be specific. This video is both about my rocket and hobby rocketry in general, so I included the information about O motors to help teach people about the different kind of motors in hobby rocketry. The Cesaroni H255 motor has an average thrust of 255 Newtons.
@ 12:04 - "ran out of steam"......be careful with your terms as you adress newbies who may not be English proficient yet watch "steam" trailing the rocket...🙂
11:20 140 meters per second speed in its first second. Compare that with:: "Saturn V Rocket Launch Speed and Height 2 " showing a whopping speed of 3 meters/second!!
We’ve been over this before. A TWR of 1.00000001 is enough for the rocket to get off the launch pad. The Saturn V had a TWR of about 1.25. You don’t want a huge acceleration: 140 m/s2 is 14 G, which would kill the humans on board. The acceleration increases as fuel is used up and the stage gets lighter, so the rocket has to be designed to keep the acceleration near the end of a stage’s run below the limit. For manned rockets, acceleration is limited to 3-5 G. At the start of the stage’s run, you then end up with a TWR of slightly over 1.
@@Hobbes746==Enistein::: I have proved my facts with empirical kitchen-table experiments which even certified retards can conduct, so, I suggest that you prove your fairytale-TWR by buying one of these O-motors, and putting it on a rocket heavy enough to make a TWR==1.25, or even 1.5, or even 2, then sit next to it at launch. If your rocket moves up, you'll survive, but if doesn't it explodes and turns you into charchoal, which would make a memorable artifact in a NASA museum !!! agree??? Based on my below comment exchanges, and assuming that you expect your O-motor to burn for 5 seconds, if you and 4 other NASA-fans like you stand on top of the motor, you'd make up the bulk of a 400 kg rocket, then fire up the motor, and expect to reach the moon in a nono-second!!! How' that for a solution Rocket-professor???
@@Hobbes746 ==Enistein::: I have proved my facts with empirical kitchen-table experiments which anyone can conduct, so, I suggest that you prove your fairytale-TWR by buying one of these O-motors, and putting it on a rocket heavy enough to make a TWR==1.25, or even 1.5, or even 2, then sit next to it at launch. If your rocket moves up, you'll survive, but if doesn't, don't worry about !!! agree??? Based on my below comment exchanges, and assuming that you expect your O-motor to burn for 5 seconds, if you and 4 other NASA-fans stand on top of the Omotor, you'd make up the bulk of a 400 kg rocket, then fire up the motor, and expect to reach the moon in a nono-second!!! Are you brave enough for that???
Hi! I am Shresth a freshman at my local university in India. I have initiated a rocketry club. It's great to watch people like you, as it inspires all.
Good luck with the club! I hope you find it rewarding.
@shresthsinha927 hello there, i am inspired by you and also want to initiate a rocketry club in my college. Can you please reply me
Hi! I'm the president of TU Darmstadt's rocketry club and I really liked your project! We started out with a very similar rocket flying an H-motor as well, but packed our own flight computer as well as a sofisticated recovery system which I can highly reccomend! Also, make sure that during descent under parachute your chute lines don't get tangled up because your rocket will most likely enter what's called a flat spin. Last month, we launched our latest rocket to a height of one kilometer and deployed three payloads - I hope you're planning something similar! It is a ton of fun, let me tell you.
Awesome! Nice work. Rice Eclipse is building a rocket for Spaceport America this summer. It'll be much larger than the rocket in this video and fly to an altitude of 30k feet. We've built our own hybrid motor for it and are very excited to see it fly.
Can eagestion system damage the parachute??
Yes, the ejection is a black powder explosion, so if the parachute isn't properly protected, it can be damaged
Anyone please help me to build my own rocket please 🙏🙏
loved it!! I did my L1 on an H550. It burns for 0.5 seconds and produces 550 newtons of thrust in that short burn time hahaha. My rocket held up great.
For my L2, i used the same rocket with a J270 motor and single deploy. However, on the second launch, the motor exploded 2.25 seconds into flight. It separated my booster from the upper airframe, feel 5300 feet and was recovered without a scratch hahaha. Only a broken shock cord :)
My L1 and L2 were done with no electronics, however, my L3 we had redundant dual deploy, but my team launched without me and forgot to hook the electronics up so it came in ballistic from 10,000 feet......
Wow! That sounds like an interesting flight record.
I'm glad the L1 went well.
Sorry about the L2. CATO's are rare with manufactured motors, but it's very frustrating when it happens. How did you keep your L2 from drifting too far with a single motor deploy? I've been working on an L2 design, but increasingly find a drogue necessary to prevent drift.
An L3 sounds like a daunting challenge. Sorry it went ballistic. Good luck getting your L3 certification.
@@GravitonMedia thanks :)
Pick the lowest L2 motor you can find. Thats how you prevent drift. Also add weight to the payload section in open rocket and sim it. I added a couple of bags of black beans to my rocket. Kept it low and slow and the extra weight helps it drift down rather than at an angle. Might land a tad harder, but my rocket was fine
The j 270 is a lower end L2 motor, but i still had to walk half a mile to get it. Oh, and if its a slightly windy day, you will have to keep an eye on it. Take binoculars and a ATV if you have one.
All in all, my L2 disnt drift very far since it was a low power3d motor and i had a couple bags of black beans in the payload section to add drag and weight.
Thanks for the advice!
Really good video - congrats on your L1!
Thanks! Glad you enjoyed it.
Woah, you said THIS was your second Rocket? Congrats!
Great video! Im working on a scratch built L1 and this definitely covers lots of important niche things!
Glad it was helpful! Good luck on your certification.
@@GravitonMedia thanks!
Great video with the basics! Certification is important but it's a funny in a way to me, let me explain:
I'm Brazilian, so rocket parts and motors aren't for sale here. There isn't a Tripoli prefecture, so I can't feasibly get a certification.
But, I'm in a college rocket team, and we managed to design (everything, including the motor!), build, fly, and recover with no damage a rocket that went slightly below 10k ft last week on Spaceport America Cup.
The event demanded everyone to be associated to Tripoli, for their insurance. Here's the funny part: everybody is a Level 0!
That's interesting. I didn't know Brazil had those regulations. My team was at Spaceport, too. Rice Eclipse Rocketry Team. I wasn't able to go myself, but maybe you met some of my friends there :)
What do you use to make the rocket designs?
OpenRocket is the program to use: openrocket.info/
Very informative
Thank you, I'm glad you enjoyed it.
Well Done, young man! Great Video... Just scribed; I want to see you do more!
Thank you for the well-wishes! I'm glad you enjoyed my video. I'm planning to build and launch an L2 rocket this spring, so I'll make a video about that as well.
6:20 Technically, it is lift, not drag. 8:05 The average thrust is constant, 255 N. The instantaneos thrust varies throughout engine firing. Great video, thank you for it.
Great video. I want to get started in rockerty myself but not sure if it was legal in my country. But after seeing this video and doing a bit of research i found out it was!
That's great to hear! Definitely pay attention to motor-purchasing requirements and height ceilings. In America, those are the two areas with the most regulation, but you can do both with the proper certifications and waivers.
Great video, it's amazing!!!
Thanks!
good work brother, best wishes
Thanks!
Congratulations!! I am currently on the design journey of an L1 attempt rocket too and this video inspired me to try harder even more!! P.S. what's the diameter of the airframe of Vulpes?
Thanks! The Vulpes had a diameter of four inches, which was definitely overkill for an L1 in retrospect. You can get cardboard tubes on Amazon that have diameters of 4in, 3in, or 2.5in. All of those work pretty well for L1s.
Interesting. This is fundamentally similar to the Estes rockets I built and flew as a kid.
Just launched my rocket with a k series engine and besides electronics and 2 stage deployment they were exactly the same
How do you know how much to file down the delay grain to get the delay to 7 seconds?
For L1 rockets, the best way to do that is to simulate your rocket on the program OpenRocket. This will give you predicted values for apogee and time of flight, which you can use to determine the optimal delay time (just after apogee is best).
Could you share the sizes of the rocket and fins, please?
Sure. Here's a link to the OpenRocket file that has all the relevant dimensions: drive.google.com/file/d/1LGcFyVThF15gDpPeObEHJWtwBjVWKXXZ/view?usp=sharing
I don't like sharp cones, the breaking of the air should be gentle, clean air is better for moving fast through it. Do you ever launch dolphin or tuna shaped cones?
Interesting. I haven't tried other-shaped cones for this type of rocket. Are the aerodynamics better?
Nose cones with rounded ends are preferred for subsonic rockets; supersonic rockets perform best with pointed cones. There are a number of research papers on this.
The cutey vulpes cutey rocket 😊
Hi great video, I'd like to know where you get your rocket supplies especially the body and nosecone. Also if you could explain how a reloadable motor works and where you can get propellant from I'd be very grateful. I'm trying to get into this type of amateur rocketry and I don't know where to start or get things.
Hi there, we get the body tubes from BOX USA, a company that makes poster mailing tubes. We get the nose cones from Apogee Rockets. Reloadable motors have reusable casings with new fuel inputted each time. You just have to buy new fuel each time.
@@GravitonMedia Thanks I really appreciate you taking the time to respond I wish you the best of luck with every future launch 😁
Thanks!
where can I find the technical sheet about the g-rocket motor pls?
That's going to depend on which model of G motor you're looking for. Is it Cesaroni, Apogee, etc.? If you don't know that yet, you can try this online store to see what suits your needs: www.hobbylinc.com/g-model-rocket-engines
Very nice , very impressive 👌👌👍
Thanks!
Could you please share Details about the Vulpes I
Sure, I made this video about it. Let me know if you want to know more: th-cam.com/video/4p2NSrbxdrA/w-d-xo.html
Como divide o centro de massa pro foguete não girar na ignição?
💯👌こういうのは、大事だね！これからは、ロケットです！！。フレーフレー阿修羅！！頑張れ、頑張れフレイアーの類！！それでよか！！。
ＹMCAの思い出をワンスモア！！OK。
I'm happy to follow your video, but I have a question and I hope for the answer: how to define the center of thrust of the rocket, before it slips into the fuselage of the mini rocket ??? please answer
I’d like to help you with this. Can you explain a little more what you’re trying to learn?
The snail😅😂
I’m very new to this. Can you reuse motors or are they all 1 time uses?
That depends on the motor. The Cesaroni H255 I used was a one-time use motor, so it would have to be replaced with a new motor after each launch. On the other hand, a motor like AeroTech H128 has a reusable casing, and just the fuel needs to be swapped out after each flight. For a beginner, the one-time use motors are simpler to assemble, as their fuel components are not detachable since they aren't meant to be swapped out. Reusable motors can be more complex since you have to work with the motor internals. Hope this helps. Happy rocket-building!
Wait, would a simple apple airtag in the payload work for recovery?
Probably not.
The issue with an AirTag in particular is that it doesn't actually use GPS tracking. Instead, the AirTag uses Bluetooth connections to nearby Apple devices to determine its location. For instance, if you drop your wallet in a busy parking lot, the AirTag will determine its location by connecting to the nearby phones of passersby. For the typical use-case of AirTags-finding misplaced keys, wallets, and other household items-this works fine.
When it comes to rocketry, launches typically occur in remote rural areas, and the rocket is unlikely to land close enough to any other Apple devices to pick up the short-range Bluetooth signal. Thus, an AirTag would not be reliable for recovery. You want to use a tracking device that has GPS capabilities.
Thankfully, most GPS trackers are in a similar price range to Apple AirTags, about 30 bucks.
@@GravitonMedia Wow, The fact you took your time to help me on thhis means alot. I really appreciate the response, You earned a subscriber! What GPS do you recommend I use?
Thank you for subscribing! I actually haven't used a GPS in my rockets yet. My team at Rice University uses Telemegas and Raven Blues for altimetry data. I think those companies might sell GPS as well, so that would be the first place I would look.
I am very greatful company’s like apogee sell these rockets in kits
Since I was young, I have hoped to build a rocket that would reach space and take pictures of the Earth.
17:00 O-motor delivers a Maximum of 40,000 Newtons==40 TONS of thrust force???
7:35 Ah, sorry. I see that's a mistake in the graphics there. It's 40,000 Newton-seconds, not 40,000 Newtons. Newton-seconds are a measure of total impulse, or change in momentum. This means that an O-motor can change the momentum of a rocket by 40,000 Newton-seconds. If delivered in one second, that would be an average thrust of 40,000 Newtons, but O-motors typically take five seconds to completely fire, for an average thrust of 8,000 Newtons.
@GravitonMedia thanks. So, 800 kilos of instant thrust, and how heavy was it at launch???
0:10 Over 3lb, Ok, let's say 4lb==2 kilos. So, then, TWR==800÷2==400.
Compare that with a whopping TWR
(VULPES II ROCKET LAUNCH)
I didn't use an O motor. I used an H motor. A Cesaroni H255 to be specific. This video is both about my rocket and hobby rocketry in general, so I included the information about O motors to help teach people about the different kind of motors in hobby rocketry. The Cesaroni H255 motor has an average thrust of 255 Newtons.
8:30 A must on all Boeing planes!!!
@ 12:04 - "ran out of steam"......be careful with your terms as you adress newbies who may not be English proficient yet watch "steam" trailing the rocket...🙂
well even tho im 14 and cant make a rocket like this I STILL THINK MY FALCON GOOFY 1000 IS GOOD ITS A WATER ROCKET >:(
11:20 140 meters per second speed in its first second. Compare that with:: "Saturn V Rocket Launch Speed and Height 2
" showing a whopping speed of 3 meters/second!!
(VULPES II ROCKET LAUNCH)
We’ve been over this before. A TWR of 1.00000001 is enough for the rocket to get off the launch pad. The Saturn V had a TWR of about 1.25.
You don’t want a huge acceleration: 140 m/s2 is 14 G, which would kill the humans on board. The acceleration increases as fuel is used up and the stage gets lighter, so the rocket has to be designed to keep the acceleration near the end of a stage’s run below the limit. For manned rockets, acceleration is limited to 3-5 G. At the start of the stage’s run, you then end up with a TWR of slightly over 1.
@@Hobbes746==Enistein::: I have proved my facts with empirical kitchen-table experiments which even certified retards can conduct, so, I suggest that you prove your fairytale-TWR by buying one of these O-motors, and putting it on a rocket heavy enough to make a TWR==1.25, or even 1.5, or even 2, then sit next to it at launch. If your rocket moves up, you'll survive, but if doesn't it explodes and turns you into charchoal, which would make a memorable artifact in a NASA museum !!! agree???
Based on my below comment exchanges, and assuming that you expect your O-motor to burn for 5 seconds, if you and 4 other NASA-fans like you stand on top of the motor, you'd make up the bulk of a 400 kg rocket, then fire up the motor, and expect to reach the moon in a nono-second!!! How' that for a solution Rocket-professor???
@@Hobbes746 ==Enistein::: I have proved my facts with empirical kitchen-table experiments which anyone can conduct, so, I suggest that you prove your fairytale-TWR by buying one of these O-motors, and putting it on a rocket heavy enough to make a TWR==1.25, or even 1.5, or even 2, then sit next to it at launch. If your rocket moves up, you'll survive, but if doesn't, don't worry about !!! agree???
Based on my below comment exchanges, and assuming that you expect your O-motor to burn for 5 seconds, if you and 4 other NASA-fans stand on top of the Omotor, you'd make up the bulk of a 400 kg rocket, then fire up the motor, and expect to reach the moon in a nono-second!!! Are you brave enough for that???
@@Hobbes746 Did you get my deleted reply???
;kjk;'ljlk
This video demonstrates how possible is teaching about homemade weapons. ...