still love these tutorials keeps me in check

Great job on your grains.

Thanks for the reply. I have never made fuel before, but I may have to give it a try.

Not a single dislike....dude, I salute you

Nice video

I choose BATES grains over the single inhibited grain for the sole reason that BATES grains give you a much better boost off of the pad than one single grain. I have used both...so my choice is preference, only.

Hi Zack...yes, if ignited from top grain you get max power. Bottom ignition motors can lose up to 30% of their potential kn.

The wadding will still let water vapor in the air through (especially on humid days). I would seal each opening with a thin cover of hot wax or hot glue. It makes a gas/water tight seal that is easily blown off when the rocket fires.

Can you do a video on collecting and entering information into the grain calculator???

@ JJ...I have not yet done a tutorial on ejection. Ran out of time but with any luck, I will have a tutorial on ejection system in two weeks. Winter is finally over here, so I am working on a 2 stage booster recovery system.

Motors are not stored with igniters in place. Igniters should be installed with the motor in the vertical position, on the test stand or on the pad.

@marcferretti

5 жыл бұрын

It takes high amperage to detonate. static electricity is high voltage and extremely low amps which could never detonate it...

@jamesluck2969

5 жыл бұрын

@@marcferretti it would really one set off the ignitor if both ends of the ignitor was connected together making a loop in the circuit.

@md123180

5 жыл бұрын

@@jamesluck2969 By connecting the leads from the igniter together, you will shunt the circuit, preventing it from firing at all. I work with high explosives, and the electrical blasting caps are shipped with a shunt in place between the leads. Basically, your electricity would have nowhere to go. For example, if you hold a hot lead, but aren't grounded, you won't get hurt. Now, that being said, everything is cool until you add the boom sticks. It's horrible practice to put igniter and fuel together until you're ready to go, because Murphy's law is just as reliable as Newton's.

12:25 Tissue Paper....Better off sticking some of those Desilicants or whatever they are called into it. you know, those packets of clear beads you get with some products. Also you should have thought about moisture and air when you sealed the grains in tupperware where they could "Suck up" the air in the container .

I couldn't find how you make the delay grain and how you places in to the tube and attach to cone para... Which episode? I couldn't find.. How you push the parachute out? Thanks!

Thanks bro! I hope u can gvme some info! I going to fire next year schools ceremony. May I know how you make the electric Match?

And by mass quantity I mean whole sticks of each size you got including reducers and things.

Great job! Maybe next time you can get your mom to iron your shirt for you :)

Lets start off by saying thank you for taking the time to make these videos, I definitely learned a LOT. But ok I have a question or two for you. I'm new to this so bare with me. I noticed you used 3-4 bates grains, if I was to up the amount to oh say 7 or so, how would that effect the design of your rocket? Like would increasing the amount of segments to the motor increase the amount of pressure on the rocket, requiring a redesign from your build. (Other than length) And second question, why does direct casting without segments cause greater pressure towards the end of the burn?

@WizzBang75

9 жыл бұрын

Hi Tony, sorry about my delayed response to this question. I missed it somehow. To answer your question...Your rocket design would have to be VERY sturdy as you are moving from an "I" class motor into the lower "K" class. I tested a 7 BATES grain motor 3 times. Twice it tore right off of the test stand and the 3rd time it drove the post of the test stand 3 inches deeper into the ground. Your nozzle throat diameter would have to go from 3/8ths inch to at least 1/2" in order to stay within safety margins. Also, your delay grain would have to burn about 5 seconds longer in order to prevent early release of the parachute. Essentially, it would change everything about the design...from using tougher air frames to delay grain changes and nozzles design changes. If you are still building, let me know, I'll help with what I can.

@matthewdom8222

9 жыл бұрын

WizzBang75 Very right. lots would change. i would like to add a small detail. Towards the end of a solid engine burn, (I'm refuring to the desing seen on this video) the surface area in side the engine grows. It is a center burn which means the flame starts ruffly in the center and burns outward down the whole length of the tube. some simple math would show that the amount of material burning is highest towards the end of the burn. The more material burning at once the higher the pressure. the nozzle limits the amount of flow which means as more material burns and tries to escape the more choking the nozzle dose which translates into more pressure. Please exercise lots of caution when increasing engine or motor sizes and propellant mixtures. And be the most afraid of the little harmless changes that shouldn't effect anything. Those are the most dangerous, and surprising.

so ignition should be from the bulkhead end/top of engine?

The diameter of the nozzle is 5/16". If you are asking what is the length (distance between the convergent and divergent points of the nozzle) then the answer is 1/2".

Good day, please tell me and the fuse of the engine where still need to be put??? closer to saplo or late engine ? And explain why?

I am trying to make a rocket with a 40mm x 15 cm pvc pipe, I am using a mixture of 35% sugar and 65%kno3. But the problem is, that the 2 rocket that I tested exploded, one I believe it was because of the ending cap, and I fixed it, but the second one exploded right in the middle of the pipe, I believe it was because I put a 6mm rod to cast the grains, and when all grains light up the gases don't have space enough to reach the nozzle( 16mm). Can you help me ? I would be appreciated. Thanks and great video

Is there a reason that you used 4 fuel grains rather then one large one?

I love the design.... the only flaw being reuse-ability.... could you not thread the ends? I understand you have high pressures but surely there's an option.

@WizzBang75

8 жыл бұрын

+mudman1st Not possible with PVC Constructed motors. The threads would never take the pressure.

That's a great idea, though your design lacks reusability, which is very important to me.

@WizzBang75

4 жыл бұрын

I completely understand. Having said that, you will need to buy commercial motors and fuel, and this will prove to be very costly.

@tristunalekzander5608

4 жыл бұрын

@@WizzBang75 I just made mine similar to yours (it's not done yet) except the motor casing and nozzle are removable/replaceable/reusable. A lot of places you have glued-on couplings, I used two different couplings with threads on one side instead, gluing only where necessary. I'm also using electronics so I don't need an ejection charge or anything. When it's done, I'll try and get a good video of it and I'll post the link for you here :)

@WizzBang75

4 жыл бұрын

@@tristunalekzander5608 I would love to see that! I always wanted to try threaded fittings but I had no confidence that they would hold up to the 1000 pounds of pressure these motors can produce.

@tristunalekzander5608

4 жыл бұрын

@@WizzBang75 We shall certainly see! My motor is a bit smaller than yours, using schedule 40 1" PVC as the motor casing. I'm 3D printing my own molds for the grains. Your videos have been a great help to me, thank you for everything you do.

Prontovega...Mad scientists DO NOT wear ironed shirts. Do you not realize how that would just ruin everything?

@Asadullah21

9 жыл бұрын

This is a one time use rocket?

@WizzBang75

9 жыл бұрын

***** one use only, my friend!

@joeestes8114

5 жыл бұрын

I have followed your videos for along time and other people as well and i have to give you credit you have stuck with it and it looks like your rockets are getting really good. Thanks for sharing!

the ignitor that we made? In which video

You have air gaps of like 1/4 inch between the bates grains. Wouldnt that cause a possible explosion such as a crack in the grain would cause?

@WizzBang75

4 жыл бұрын

No, Red. That is the intended design. BATES Grains burn from the inside - out, top to bottom and bottom to top. This provides an exceptionally stable pressure/thrust.

What is the longest engine tube you have built or no of being built?????

@WizzBang75

2 жыл бұрын

I hesitate to say!

Yes, I was referring to the thickness of the throat.

sir can u explain me how u made rocket fuel

Would you mind explaining the purpose of bates grains, and why you put the fuel into different sections? What is the point of having a hole through the center of the engine? Does it add more power to the engine?

@WizzBang75

10 жыл бұрын

DontPutSpiceonRice: BATES grains was designed to give a steady amount of thrust throughout the burn. It burns from the the center to the side, from top to bottom and from bottom to top. The Core in a motor is essentially the only way a high powered rocket motors with produce enough thrust to lift the object off the ground. For example: an end-burning motor will produce about 70 kn of thrust. That same motor with a core will produce 150 kn. These are numbers that will vary greatly depending upon motor design. Put the idea into terms of horsepower...Do you want 70 or 150 to get the job done?

@Gormfork

10 жыл бұрын

WizzBang75 Thank you very much. Also, why are motors cut into sections, instead of just being cast inside the rocket itself? And what is the of an inhibitor sleeve?

@WizzBang75

10 жыл бұрын

DontPutSpiceonRice: Inhibitor sleeves act as a thermal barrier between the fuel and the motor walls. For the purpose of BATES grains, they also prevent the fuel from burning on the outside, as BATES are supposed to burn from top to bottom, bottom to top and inside out....NOT outside in as well. To answer your other question...you can cast fuel directly into the motor, and I have done this as well. When using BATES grains, you get a "Flat" thrust...a relatively even thrust. Casting directly into a motor gives you a Single grain which will produce "Progressive" thrust...power that will increase over the short duration of the burn. Using that technique you will get higher chamber pressures towards teh end of the burn. Both work well, but I prefer BATES. It's only a matter of preference.

Can i reuse the motor again after flight ?

there is dew on those grains from the refrigerator what do you do>?

hi i don't understand why you use 4 small piece of bates , why not to use 1 piece very long ?

@WizzBang75

8 жыл бұрын

+MrGurkanify The 4 BATES grains give you a relatively even amount of thrust throughout the burn. A single grain gives you a progressively more powerful burn. That increase in pressure is much more likely to lead to CATOS.

@ JJ...the electric match is on the next tutorial...#6.

Seriously? This first step here is NOT needed with the propellant I use because the propellant can directly be cast in the motor chamber/chambers eliminating this step.

@skyprop

10 жыл бұрын

Although for multiple grains your technique may be better. But for one long single cast grain, the "Direct cast method" I find to be better.. With Mixing The propellant I use, It CAN be mixed in Large batches therefore Allowing the "Direct Cast Method"

@skyprop

10 жыл бұрын

skyprop now for the motor you show in this clip I could have cast directly in one shot eliminating several steps

@skyprop

10 жыл бұрын

skyprop I've successfully "Single cast" motors of 3"X12" in one shot and could do bigger mixes.

@spacecadet35

7 жыл бұрын

BATES grains and Single Cast motors have different burn profiles. For many applications the BATES grain is a better, but slightly more complicated, solution

Low temp burning motor...1000 degrees. I deal with motors at 5000+ at the exhaust damn!!

why does your igniter get installed at the top of the fuel cell....shouldn't the burn start at the nozzle end?....noob hear askin' the question

@WizzBang75

6 жыл бұрын

devonwesticles you gain about 30 percent thrust with placement at the top.

@devonwesticles

6 жыл бұрын

WizzBang75 how does it not start burning your slow powder right away and get pre parachute ejection

@jamesluck2969

5 жыл бұрын

@@devonwesticles, with cored rockets the grain should be ignited at the top of the cell to enable the full motor ignition as hot gasses escape. This allows for a faster launch with out wasting as much fuel. A end burner rocket lights from the bottom up only a small portion of the motor is cored. I'm assuming here but if it lights the top charge at the same time as it should then you would need a time delay charge set at the duration of complete burn and max attitude. So once the rockets motor has completely burned off and the rocket has stopped gaining altitude the chute will deploy.

Hey 👍 How to insert high powered Oxygen into hole, Its get very pricey 😎 Nowadays you are not uploading any Videos 😭

@WizzBang75

2 жыл бұрын

Sorry bud. I do not live near an adequate launch area.

Does anybody sell these pre made?

How can you call a motor with the igniter installed "safe for storage"? Once that igniter is in place, all you need is a little static electricity and you have a lit motor. One of the most basic rocketry safety rules is to NEVER install the igniter until you have the motor in the rocket, and the rocket on the pad, ready to fly.

@richardball9724

8 жыл бұрын

like with working with dets for he just twist the ends together which will safe the ignitor from electro static pickup

no no no Don't use "Quick -pop" squibs...... As an Igniter. they are designed to light off ejection charges. And may be inconsistent in lighting your motors. you must develop your own igniter. using trimmed off pieces of propellant

These motors are not re-useable after flight.

Yep, making a rocket out of toilet pipe, wouldn't want to guess.......

Dude...really...paper towel as a vapor barrier?..F that...use your duct tape, much better seal....nd if you need to keep moisture out, then why not add a little salt that can be dumped harmlessly before launch? I like your design...what did it cost you in pvc parts?..not individually, but in mass quantity.

@adam9386

9 жыл бұрын

John Dexter its not supposed to be water/air tight, the paper will absorb the moister where tap will not.