it is magnificent that you use simple tools like a pizza cutter for the fiberglass. We really need to think a bit simpler. That tipp will be used ❤. Well then the production of the nozzle is shown an we instantly feel like we are just some guys without any proper equipment. Loved the video though . great process so far
Thanks, although it looks like a pizza cutter, it is actually a roller cutter typically used for cloth. (here is an example: www.scissorman.com.au/product-tag/rotary-cutter/) If you ever need to cut fiberglass cloth, it is the ONLY tool to use. You'll never go back to scissors once you've used it. Much cleaner and faster for complex or straight cuts.
yes looks like it we used a big commercial cutting Maschine but the blade was getting absolutely destroyed by the cloth. We will definitely invest in such a tool. thank you 😊
Excelente labor!!! Es de destacar vuestra prolijidad en la construcción del cohete. Espero la siguiente parte y ansioso de verlo volar. Saludos desde Uruguay 🇺🇾
What a great work!! I am so impressed! What type of aluminium you used for the nozzle and the internal diameter for the nozzle? sorry if it is already on the video ;)
@@AirCommandRockets Thank you for the answer! I am building a water rocket in Korea for the first time. I wanted to build a L2 HPR but launching and making a solid rocket fuel are illegal here, so I turned into water rocket and it fascinated me. Your video helped a lot Thanks again. Keep up the good work!
Its always such a good moment in my day to watch a new video from your channel. I have a question for you. Sorry if you already responded and I missed it but do you have a strategy for fiberglass sheets overlaps? Any fixed amount? (ex. 2 cm or 1/6 circum.) Thx. Greetings from Canada.
Hi, and thanks for your support. :) Yup, exactly, the last circumference wrap overlaps by 2cm. If we then do a second wrap with another sheet, we always end it on the opposite side of the mandrel so that the two overlaps are opposite each other to try to even out the forces on the pressure chamber.
Nice video ! Have you ever tried the FG sleeve to make the nose cone ? It's a _whole_ lot eaiser, faster, cleaner, it's also seemless, and you already buy sleeve from soller so...why not ?
Never tried it on the nosecone. I've thought about it though, the problem I see is that you still end up with a transition somewhere along the nosecone. The sleeve will only shrink down so much without folds, it won't go over the tip and you end up with frayed edges where you cut it. You could maybe use two sizes but because of the taper you can't pull the second one tight. Have you used them yourself? I'd be interested in knowing how you do it. Going from 4.5" to a tip?
I have a question about the epoxy you use to making this rocket. What is the epoxy you use for this rocket, and does it have high temperature resistance. I am also building a compress air rocket which is aimed to reach Mach 2 so I am currently very concern about the surface temperature and the ability to withstance heat of the rocket's material at high temperature. I am also watch alot of your videos right now and learn a lot from them. Hope to get your response. Best regards.
Hi, the epoxy we use is West Systems 105 with the 206 slow hardener. It isn't a high temperature epoxy. I think it's glass transition temperature is around 58 degrees C. There are high temperature epoxies you can use but these tend to be a bit more expensive, however, most of the airframe isn't going to experience very high temperatures for a long periods of time. I would be comfortable using West Systems on most of the airframe even for a Mach 2 rocket. You would want to protect all the leading edges though with different materials or higher temperature epoxies. ... You mentioned a compressed air rocket going at Mach 2. Do you have any details on your proposed rocket and how you would achieve those kinds of speeds?
@@AirCommandRockets Well, for our rocket, we intend to use a convergent-divergent nozzle that we design to have an optimal area ratio and pressure ratio that can accelerate the flow to mach 2 and above. The chamber pressure we choose is 10 bar so we calculated the appropriate area ratio and pressure ratio base on isentropic flow relation and got a result of about 1.91 and 9.87 which thereotically can help to accelerate the flow through our nozzle to maximum exhaust velocity of Mach 2.14, and from these 2 quantity, we can also calculated the real exhaust velocity, mass flow rate, specific impulse and thrust. So our rocket will have a real life exhaust of around Mach 1.53, a mass flow rate of 0.82 m/s, a specific impulse of about 53.8 s and a thrust of about 434 N. The exhaust velocity is not so high, which is understanable since our rocket use air as propellant, and I calculated base on the temperature of the air at sea level (15°C), the chamber temperature is not high enough to make the flow to reach mach 2 (which need a temperature of around 280 degree celcius), but with a thrust of 434 N, and a constant exhaust velocity of Mach 1.5 (because of the correct area ratio) we think that if we can make our rocket light enough and somehow find a way to increase the total temperature of our compress air propellant, our rocket speed can reach Mach 2 even if the flow did not. Thank you for your respond and show your concern about our project, I am very appreciate it. This is the first time we doing an ambitious project like this so it is very important to us to be able to find as much knowledge as we can. I will consider your advices and protect all the leading edges with higher temperature epoxy or different materials (and sorry to ask this but I don't really get it about the leading edge, does it mean all the joints and the edge of the fins, thanks again).
@@HoangNguen-o2j Thanks for sharing the very detailed explanation. Although the exhaust velocity can be supersonic as you pointed out with an expansion nozzle. But that doesn't necessarily translate to the velocity of the rocket when you take weight and drag into account, and the fact that thrust duration is very short. Practically the rocket will be well subsonic. But happy to hear what you actually achieve when you build it. And yes, leading edges are anything that protrudes from the air frame of the rocket like the nosecone tip, any transitions, rail buttons, etc. and the forward edges of the fins.
You probably know it, but filing or sawing fiberglass will quickly dull your tools. Glass is much harder than steel, so it is not ideal to cut it with with steel tools. With the hacksaw, it's probably fine as the blades are cheap anyways, but I wouldn't use a file for it.
Yup definitely good advice. We do go through quite a few blades, the better quality ones last a little longer. Surprisingly the cheap file we use on the fiberglass has lasted a couple of years and still does a reasonable job. We don't use our good files on the fiberglass.
it is magnificent that you use simple tools like a pizza cutter for the fiberglass. We really need to think a bit simpler. That tipp will be used ❤. Well then the production of the nozzle is shown an we instantly feel like we are just some guys without any proper equipment. Loved the video though . great process so far
Thanks, although it looks like a pizza cutter, it is actually a roller cutter typically used for cloth. (here is an example: www.scissorman.com.au/product-tag/rotary-cutter/) If you ever need to cut fiberglass cloth, it is the ONLY tool to use. You'll never go back to scissors once you've used it. Much cleaner and faster for complex or straight cuts.
yes looks like it we used a big commercial cutting Maschine but the blade was getting absolutely destroyed by the cloth. We will definitely invest in such a tool. thank you 😊
Great video!
Excelente labor!!!
Es de destacar vuestra prolijidad en la construcción del cohete. Espero la siguiente parte y ansioso de verlo volar. Saludos desde Uruguay 🇺🇾
Thank you thorinti :)
What a great work!! I am so impressed! What type of aluminium you used for the nozzle and the internal diameter for the nozzle? sorry if it is already on the video ;)
Thanks. I am not sure what the aluminium was, but it was easy to machine. Nozzle diameter is 15.6mm.
@@AirCommandRockets Thank you for the answer! I am building a water rocket in Korea for the first time. I wanted to build a L2 HPR but launching and making a solid rocket fuel are illegal here, so I turned into water rocket and it fascinated me. Your video helped a lot Thanks again. Keep up the good work!
Enjoyed the video(s).
Its always such a good moment in my day to watch a new video from your channel. I have a question for you. Sorry if you already responded and I missed it but do you have a strategy for fiberglass sheets overlaps? Any fixed amount? (ex. 2 cm or 1/6 circum.) Thx. Greetings from Canada.
Hi, and thanks for your support. :) Yup, exactly, the last circumference wrap overlaps by 2cm. If we then do a second wrap with another sheet, we always end it on the opposite side of the mandrel so that the two overlaps are opposite each other to try to even out the forces on the pressure chamber.
When is the launch of Tajfun 2?
We are aiming for August for the cert flight on a J360. The water rocket launch happened last month: ruclips.net/video/aCafRBu3yGE/видео.html
Nice video ! Have you ever tried the FG sleeve to make the nose cone ? It's a _whole_ lot eaiser, faster, cleaner, it's also seemless, and you already buy sleeve from soller so...why not ?
Never tried it on the nosecone. I've thought about it though, the problem I see is that you still end up with a transition somewhere along the nosecone. The sleeve will only shrink down so much without folds, it won't go over the tip and you end up with frayed edges where you cut it. You could maybe use two sizes but because of the taper you can't pull the second one tight. Have you used them yourself? I'd be interested in knowing how you do it. Going from 4.5" to a tip?
If you wanted to do something 'rocket' like, you could use gas to pressurize the rocket to keep it rigid
I have a question about the epoxy you use to making this rocket. What is the epoxy you use for this rocket, and does it have high temperature resistance. I am also building a compress air rocket which is aimed to reach Mach 2 so I am currently very concern about the surface temperature and the ability to withstance heat of the rocket's material at high temperature. I am also watch alot of your videos right now and learn a lot from them. Hope to get your response. Best regards.
Hi, the epoxy we use is West Systems 105 with the 206 slow hardener. It isn't a high temperature epoxy. I think it's glass transition temperature is around 58 degrees C. There are high temperature epoxies you can use but these tend to be a bit more expensive, however, most of the airframe isn't going to experience very high temperatures for a long periods of time. I would be comfortable using West Systems on most of the airframe even for a Mach 2 rocket. You would want to protect all the leading edges though with different materials or higher temperature epoxies. ... You mentioned a compressed air rocket going at Mach 2. Do you have any details on your proposed rocket and how you would achieve those kinds of speeds?
@@AirCommandRockets Well, for our rocket, we intend to use a convergent-divergent nozzle that we design to have an optimal area ratio and pressure ratio that can accelerate the flow to mach 2 and above. The chamber pressure we choose is 10 bar so we calculated the appropriate area ratio and pressure ratio base on isentropic flow relation and got a result of about 1.91 and 9.87 which thereotically can help to accelerate the flow through our nozzle to maximum exhaust velocity of Mach 2.14, and from these 2 quantity, we can also calculated the real exhaust velocity, mass flow rate, specific impulse and thrust. So our rocket will have a real life exhaust of around Mach 1.53, a mass flow rate of 0.82 m/s, a specific impulse of about 53.8 s and a thrust of about 434 N. The exhaust velocity is not so high, which is understanable since our rocket use air as propellant, and I calculated base on the temperature of the air at sea level (15°C), the chamber temperature is not high enough to make the flow to reach mach 2 (which need a temperature of around 280 degree celcius), but with a thrust of 434 N, and a constant exhaust velocity of Mach 1.5 (because of the correct area ratio) we think that if we can make our rocket light enough and somehow find a way to increase the total temperature of our compress air propellant, our rocket speed can reach Mach 2 even if the flow did not. Thank you for your respond and show your concern about our project, I am very appreciate it. This is the first time we doing an ambitious project like this so it is very important to us to be able to find as much knowledge as we can. I will consider your advices and protect all the leading edges with higher temperature epoxy or different materials (and sorry to ask this but I don't really get it about the leading edge, does it mean all the joints and the edge of the fins, thanks again).
@@HoangNguen-o2j Thanks for sharing the very detailed explanation. Although the exhaust velocity can be supersonic as you pointed out with an expansion nozzle. But that doesn't necessarily translate to the velocity of the rocket when you take weight and drag into account, and the fact that thrust duration is very short. Practically the rocket will be well subsonic. But happy to hear what you actually achieve when you build it.
And yes, leading edges are anything that protrudes from the air frame of the rocket like the nosecone tip, any transitions, rail buttons, etc. and the forward edges of the fins.
what material is this that covered the whole thing?
The whole rocket is made out of fiberglass. We use West Systems epoxy resin.
You probably know it, but filing or sawing fiberglass will quickly dull your tools. Glass is much harder than steel, so it is not ideal to cut it with with steel tools. With the hacksaw, it's probably fine as the blades are cheap anyways, but I wouldn't use a file for it.
Yup definitely good advice. We do go through quite a few blades, the better quality ones last a little longer. Surprisingly the cheap file we use on the fiberglass has lasted a couple of years and still does a reasonable job. We don't use our good files on the fiberglass.
What software did you use to design the rocket nozzle? Or software should I use? RPA isn’t working for me
do you experience constant crashing of 123d Design? How do you fix it? Much appreciated.