Great video. Please make a full series. I've seen so many people that want to start out with powder packed sugar motors in PVC cases with no thought to the design. I would love to have a good video series to point them towards.
I don't recommend packed sugar or Rcandy motors. There is no reason to guess on motor designing now that we have excellent tools to use. Thanks for your comments!
@@devilliar3786 I do not recommend Rcandy or dry packed sugar motors. I do use and recommend sorbitol and flexi-fuel because they are safer and more consistent in use.
Hi! I'm from Latvia and I recently fund your channel. Brilliant content with impeccable quality! In you're video's you show things that I cant find anywhere else. Keep up the good work!
I hope to know the values in the spring. By then my digital trust stand will provide the data I need.The presets would have to be added by the owner of Meteor. Jerome is willing to add flexi-fuel when I have more data. I will have a working KN value in the near future. The data can be used in BurnSim. www.burnsim.com/
Awesome content! I think you should make a comprehensive guide about how to design a rocket motor. People think it is easy to mix two things and make rocket motors. Greetings from Turkey!
I have several videos on casting propellant featured on my channel, watch for an updated tutorial this summer. There is no reason to guess when making fuel or choosing a nozzle size. I like your idea about combinig both into one video. Thanks for the comment and greetings to Turkey!
Building rocket motors is an art as much as it is a science. The software provides a good starting place to begin with motor planning. The software cannot account for some of the following things. *Ambient temperature. A temp range from 15°C to 35°C makes a difference in burn rate. *Thorough mixing and pouring technique. *Purity and mesh of the KNO3. *Moisture level of the fuel. This is where the art of design comes into play. If the motor burns in one second or less for a 38mm then the pressure is probably too high. The only way to really know is to measure the pressure during a burn. Good question! I hope that helps.
Around 500 PSI for 1" PVC motor works well. I have not had a PVC motor fail at that pressure and they seem to have good performance. I have not tested at higher pressures.
Hey! I’ve created a simple sugar motor using powdered and packed clay as my nozzle. They usually work well but sometimes the clay plug slides out when the rocket is burning and usually results in the destruction of my rocket. Would you have and recommendations on how to make the clay nozzle not slide out? Thanks!
You could try scoring the inside of the motor with a Dremel to allow something for the clay to grab onto. Allow extra room at the nozzle and use epoxy or epoxy clay to add additional support. Good luck!
Potassium chlorate is a very powerful oxidizer that has been replaced with potassium perclorate. Potassium nitrate is cheaper and safer for use with sugar motors. I do not recomment kclo3.
Australia here, thank you for this video great tool. Questions x2 how are optimal convergence and divergent angles picked? What values do we need to use to simulate a 1% ferrous oxide- KnO3/Sugar mix till we build up a data table? j m
The convergence angle is usually 60 - 45 degrees with 60 being the most common. A divergent angle of 15° works well for sugar motors. METEOR offers the option of changing the angles in the nozzle tab. At this point I don't know the values for RIO. I get a lot of questions on this subject and I plan on doing some testing this summer on doped fuels. For unknown fuels I try to keep the burn time at one second minimum for 38MM and a max of 1.35 seconds. I aim for the longer time and work back if necessary. Greetings to Australia!
This is a great software. I am still learning how to use it. There is one thing I was curious. Do you happened to have data on the flex fuel to plug into this amazing software. Thx
I use the "sorbitol oxidizer lightly milled" preset. Flexi-fuel will burn slightly faster but the preset works well to start with. I keep my KN around 350 max for flexi-fuel in an aluminum case motor and 400 for sorbitol. Mouse over the graph to see the KN reported. Good luck and watch for more videos on Meteor settings.
Hey~! Greetings from Dominican Republic! Love your videos, really hope you get all the subs you deserve. I started this hobby a few months ago with the powder mix motors and just now im starting to experiment with bates grain, my cat litter nozzles are blowing up and its hard to get the right materials for a solid nozzle locally as i have to find equivalents or have em shipped all the way over here. Best regards! Btw in one of ur videos you suggested hidraulic cement, does regular cement works? Like the one its used for making sidewalks
I know you are working on your flex fuel motor performance in METEOR. But from what you have seen from testing, are the flex fuel motors comparable to sorbitol motors, or do the flex fuel motors produce less thrust? I know that KNSU motors are more powerful than Sorbitol motors, but I would assume with the extra water in the Karo syrup flex fuel motors would not produce as much thrust as the Sorbitol motor. I do not have a thrust measuring stand. But when I test motors (strapped to a concrete block) it seems that the flex fuel motors are more powerful than Sorbitol. That is counter-intuitive. Maybe I am just better at producing the flex fuel motors. Thanks for all you do with this channel. You have been a great help!
Great questions and thanks for the comment! I don't have a direct comparison between sorbitol and flex-fuel at this time. My first motor test in the spring will be to establish a baseline for the two fuels on a digital thrust stand. I think the burn rate and ISP for the two fuels will end up fairly close. After that I will start testing the aluminum doped fuel. I do boil off some of the water in flex-fuel by holding the temperature at 250°F for a few minutes and then casting at 265°F. I think there is some residual water left. It may be possible that because sucrose is used that the small amount of water is compensated by the faster burning and energetic sugar. One simple test is to use two identical motors with the same amount of fuel in an actual rocket and see what happens. I like to perform motor test but the real fun is always in watching my rocket rip off the pad with my own fuel!! Chuck
@@TheRocketeer I actually did recently make a three grain motor with Sorbitol and a three grain motor with your flex fuel. When I test fired both, it seemed (just from the eye and ear test) that the flex fuel motor was more powerful. I really need to build my thrust stand to output thrust from a load cell to an Arduino. I have all the components, I have just been too lazy to put them together.
Great tutorial. Through your recommending I have used this program. I made different profiles for rockets. My problem is that I’m eduguessing at the max pressure my pvc engines can take. Do you have any idea what a 9” pvc , 1” ID can withstand. It is stamped on the tube for its intended purpose, but they have survived my 12” launches with kno3 and sugar with some iron oxide added. Those aluminum tubes you use are stupid expensive in Canada. I’m trying to keep everything home made without blowing myself up.💣I have upped my safety procedures.
It is difficult to determine the max pressure for a PVC motor because heat and vibration play a role. The max working pressure according to this chart is 450 PSI with 1,440 listed as minimum burst pressure. At 12" your motor is already erosive burning so there is a practical limit to length. You may want to consider moving up to 1.25" pipe if you need more thrust. www.jacobsrocketry.com/aer/misc_tables.htm www.jacobsrocketry.com/aer/motor_design_tables.htm
@@TheRocketeer those are fantastic charts. Just what I was looking for. I’ll tape those up in my work space. Wont launch til spring. Two bigger rockets(for me) ready to go with electronic detonation and altitude. 12” engine with 5 grains tested and ready to put into my rocket body. It will be epoch, one way or another.
Rocketry is alive and well in Denmark. Check out "Dark": dark.dk/ Danish Student Association: facebook.com/DanSTAR.DTU/ DTU: www.dtu.dk/english/news/2018/04/dtuavisen-students-to-build-own-rocket??id=e270db3a-bcab-4333-ac89-0406c70621cd copenhagensuborbitals.com/ Contact one of the above groups and they may be able to help you. Good luck!
Great video. Please make a full series. I've seen so many people that want to start out with powder packed sugar motors in PVC cases with no thought to the design. I would love to have a good video series to point them towards.
I don't recommend packed sugar or Rcandy motors. There is no reason to guess on motor designing now that we have excellent tools to use. Thanks for your comments!
@@TheRocketeer Why are you doing videos on sugars motors then if you don’t recommend them?
@@devilliar3786 I do not recommend Rcandy or dry packed sugar motors. I do use and recommend sorbitol and flexi-fuel because they are safer and more consistent in use.
Hi! I'm from Latvia and I recently fund your channel. Brilliant content with impeccable quality! In you're video's you show things that I cant find anywhere else. Keep up the good work!
Hello! I am from Romania and I want to thank you for your work for the benefit of science and the community. God bless you!
Thank you for the generous comment! Welcome to our rocket community.
Great video, greetings from Poland.
Hey there Rocketeer, love your videos. I'm an expat living in Saudi Arabia
Thanks!
Hi! I'm from INDIA. THANKU FOR THIS VIDEO SIR 👍👍
Well done, Jérôme from France 😉
Hello from the Netherlands!
Hi from Switzerland!
greetings from belgium
From Rio de Janeiro, great vídeo .
2:20 any plans soon for a video on how to find those values for different fuels we want to enter?
I hope to know the values in the spring. By then my digital trust stand will provide the data I need.The presets would have to be added by the owner of Meteor. Jerome is willing to add flexi-fuel when I have more data.
I will have a working KN value in the near future. The data can be used in BurnSim.
www.burnsim.com/
Awesome content! I think you should make a comprehensive guide about how to design a rocket motor. People think it is easy to mix two things and make rocket motors. Greetings from Turkey!
I have several videos on casting propellant featured on my channel, watch for an updated tutorial this summer. There is no reason to guess when making fuel or choosing a nozzle size. I like your idea about combinig both into one video. Thanks for the comment and greetings to Turkey!
Hi from South Africa
Hello, I'm from Ethiopia
Sir I am from India and i have some dought that can we use pvc pipe in rocket motor section in model Rocket ??
Make more videos! Hello with Russia!
Hi from Australia
This is my favorite channel about model rockets. I have a question: should not the outer surface be inhibited? Thanks
Yes, there is an inner casting liner and an outer thermal liner to help protect the case from extreme heat.
thanks
Hey you are so awesome and inspiration, Pakistan
Hlo from India
If I assume chamber pressure and Based on this assumption i design the nozzle , how can I be sure i can achieve this pressure inside the chamber ?
Building rocket motors is an art as much as it is a science. The software provides a good starting place to begin with motor planning. The software cannot account for some of the following things.
*Ambient temperature. A temp range from 15°C to 35°C makes a difference in burn rate.
*Thorough mixing and pouring technique.
*Purity and mesh of the KNO3.
*Moisture level of the fuel.
This is where the art of design comes into play. If the motor burns in one second or less for a 38mm then the pressure is probably too high.
The only way to really know is to measure the pressure during a burn. Good question!
I hope that helps.
why exsplozy roket
hi from INDIA ♥
Hi, I have many viewers from India!
for a motor casing made from PVC, what would the maximum recommended pressure be?
Around 500 PSI for 1" PVC motor works well. I have not had a PVC motor fail at that pressure and they seem to have good performance. I have not tested at higher pressures.
@@TheRocketeer thank you
Hey! I’ve created a simple sugar motor using powdered and packed clay as my nozzle. They usually work well but sometimes the clay plug slides out when the rocket is burning and usually results in the destruction of my rocket. Would you have and recommendations on how to make the clay nozzle not slide out? Thanks!
You could try scoring the inside of the motor with a Dremel to allow something for the clay to grab onto. Allow extra room at the nozzle and use epoxy or epoxy clay to add additional support. Good luck!
what do u think about using kclo3 with sugar ??????😙😙😙
Potassium chlorate is a very powerful oxidizer that has been replaced with potassium perclorate. Potassium nitrate is cheaper and safer for use with sugar motors. I do not recomment kclo3.
potasiun clorate is a power explosive,dont use in propeland,the burn rate is higt under presure of rocket chamber
Australia here, thank you for this video great tool. Questions x2 how are optimal convergence and divergent angles picked? What values do we need to use to simulate a 1% ferrous oxide- KnO3/Sugar mix till we build up a data table? j m
The convergence angle is usually 60 - 45 degrees with 60 being the most common. A divergent angle of 15° works well for sugar motors. METEOR offers the option of changing the angles in the nozzle tab. At this point I don't know the values for RIO. I get a lot of questions on this subject and I plan on doing some testing this summer on doped fuels. For unknown fuels I try to keep the burn time at one second minimum for 38MM and a max of 1.35 seconds. I aim for the longer time and work back if necessary. Greetings to Australia!
@@TheRocketeer Thank you look forward to seeing how your summer testing works out!
This is a great software. I am still learning how to use it. There is one thing I was curious. Do you happened to have data on the flex fuel to plug into this amazing software. Thx
I use the "sorbitol oxidizer lightly milled" preset. Flexi-fuel will burn slightly faster but the preset works well to start with. I keep my KN around 350 max for flexi-fuel in an aluminum case motor and 400 for sorbitol. Mouse over the graph to see the KN reported. Good luck and watch for more videos on Meteor settings.
@@TheRocketeer thx
Hey~! Greetings from Dominican Republic! Love your videos, really hope you get all the subs you deserve. I started this hobby a few months ago with the powder mix motors and just now im starting to experiment with bates grain, my cat litter nozzles are blowing up and its hard to get the right materials for a solid nozzle locally as i have to find equivalents or have em shipped all the way over here. Best regards! Btw in one of ur videos you suggested hidraulic cement, does regular cement works? Like the one its used for making sidewalks
Yes, regular cement will work. Hydraulic cement sets up faster and expands slightly. Good luck on your journey and let me know how it works out!
I know you are working on your flex fuel motor performance in METEOR. But from what you have seen from testing, are the flex fuel motors comparable to sorbitol motors, or do the flex fuel motors produce less thrust? I know that KNSU motors are more powerful than Sorbitol motors, but I would assume with the extra water in the Karo syrup flex fuel motors would not produce as much thrust as the Sorbitol motor. I do not have a thrust measuring stand. But when I test motors (strapped to a concrete block) it seems that the flex fuel motors are more powerful than Sorbitol. That is counter-intuitive. Maybe I am just better at producing the flex fuel motors.
Thanks for all you do with this channel. You have been a great help!
Great questions and thanks for the comment!
I don't have a direct comparison between sorbitol and flex-fuel at this time. My first motor test in the spring will be to establish a baseline for the two fuels on a digital thrust stand. I think the burn rate and ISP for the two fuels will end up fairly close. After that I will start testing the aluminum doped fuel.
I do boil off some of the water in flex-fuel by holding the temperature at 250°F for a few minutes and then casting at 265°F. I think there is some residual water left. It may be possible that because sucrose is used that the small amount of water is compensated by the faster burning and energetic sugar. One simple test is to use two identical motors with the same amount of fuel in an actual rocket and see what happens. I like to perform motor test but the real fun is always in watching my rocket rip off the pad with my own fuel!!
Chuck
@@TheRocketeer I actually did recently make a three grain motor with Sorbitol and a three grain motor with your flex fuel. When I test fired both, it seemed (just from the eye and ear test) that the flex fuel motor was more powerful.
I really need to build my thrust stand to output thrust from a load cell to an Arduino. I have all the components, I have just been too lazy to put them together.
Great tutorial. Through your recommending I have used this program. I made different profiles for rockets. My problem is that I’m eduguessing at the max pressure my pvc engines can take. Do you have any idea what a 9” pvc , 1” ID can withstand. It is stamped on the tube for its intended purpose, but they have survived my 12” launches with kno3 and sugar with some iron oxide added. Those aluminum tubes you use are stupid expensive in Canada. I’m trying to keep everything home made without blowing myself up.💣I have upped my safety procedures.
It is difficult to determine the max pressure for a PVC motor because heat and vibration play a role. The max working pressure according to this chart is 450 PSI with 1,440 listed as minimum burst pressure. At 12" your motor is already erosive burning so there is a practical limit to length. You may want to consider moving up to 1.25" pipe if you need more thrust.
www.jacobsrocketry.com/aer/misc_tables.htm
www.jacobsrocketry.com/aer/motor_design_tables.htm
@@TheRocketeer those are fantastic charts. Just what I was looking for. I’ll tape those up in my work space. Wont launch til spring. Two bigger rockets(for me) ready to go with electronic detonation and altitude. 12” engine with 5 grains tested and ready to put into my rocket body. It will be epoch, one way or another.
hi i am watching from india 1:04
I have many viewers from India. Welcome!
i have Problems..
Me too. If the problems are related to rocketry then I may be able to help :)
I from Denmark but we Arendt allowed to fly rockets. Its a shame i love space rockets. So i just buy and build model rockets with out flying. 😭
Rocketry is alive and well in Denmark. Check out "Dark": dark.dk/
Danish Student Association: facebook.com/DanSTAR.DTU/
DTU: www.dtu.dk/english/news/2018/04/dtuavisen-students-to-build-own-rocket??id=e270db3a-bcab-4333-ac89-0406c70621cd
copenhagensuborbitals.com/
Contact one of the above groups and they may be able to help you. Good luck!
@@TheRocketeer and Copenhagen Suborbitals!
Hi
Hi 9
hello ,how are ya doin ?? hope ure doing well.i got some doubts if ure free
Have no fear, it all works! I have been doing this for years.