AD=ADA548734. Web.mit.edu/e_peters/Public/Rockets/Rocket_Propulsion_Elements.pdf. Rocketry. SPL Swiss Propulsion Laboratory, affordable Rocket Propulsion and Accessories. Skylighter Fireworks Making. This article was provided by Ned Gorski.
If you look in the end of most black powder rockets, or at the end of a gerb (fountain), you’ll see a clay nozzle recessed into the end of the paper tube. A Clay Nozzle In Paper Rocket Tube A nozzle is a mechanical device with a hole in it, which controls and directs the flow of a liquid or gas as it passes through it.
Think of the nozzle you put on the end of your garden hose. It controls the water flow, builds up higher pressure in the hose than would normally be there, and projects the water out in a nice stream. Typically, the nozzle in a rocket, and the solid plug at the top of the rocket motor’s fuel grain, is a rammed (hand pounded with a mallet) or pressed (with a hydraulic or mechanical rocket press) mixture of wax, clay, and grog. I did that for a while, but found that the clay nozzles were very susceptible to shrinkage/expansion, depending on the day’s humidity.
Paraffin Wax for Making Rocket Nozzles. Black Powder Rocket, Sugar Rocket, Stinger Missile Rocket Kits.
TM65 Liquid Propellant Rocket Engine - Episode 1. O Class Hybrid Injector. Preface: Since the start of the HR-5 hybrid engine project, the engine has been static tested 5 times in varying configurations, using different fuels and injector flow rates.
The engine has also been successfully flight tested in 2 flights, one to over 15,000' and another to over 23,000'. While I may have a use for the HR-5 engine again in the future, for now I'm moving on to a similar design in a 6" engine. Below are links to the individual HR-5 test pages. Static Test 139: HR5 Hybrid First Test Static Test 140: HR5 Hybrid Second Test Static Test 141: HR5 Hybrid Third Test Static Test 143: HR5 Hybrid with full ground support Static Test 144: HR5 Hybrid Test 5 Launch Test 148: Aestus "O" Class Hybrid 15,000'+ Launch Test 149: Defiance Hybrid "O" Class 23,000'+ After the first successful test of the #4 hybrid engine, I was stuck trying to decide if I should do more tests of the 2.5" engine, or move on to a larger engine.
Here's a look at the injector design. June 23, 2007: Fuel Grain: Parts: Robert's Rocket Project - Home. I believe Thomas Edison said, "I have not failed.
I've just found 10000 ways that won't work. " Well, I've found at least one way to build a flight weight tank and a valve that don't work at cryo temperatures. I ran cold tests a couple of weeks ago with LN2 and the tank leaked like Niagara Falls around the seal when pressurized. I knew it would leak some but I didn't expect that much. So, it's back to the drawing board for the LOX tank. I looked into what it would take to make welded tanks and decided it's not the way to go right now. Here's my list of tank ideas along with the pros and cons of each: The aluminum tube with a stainless plug bulkhead is an intriguing concept.
I had better luck with the custom propellant valve but it needs a little more work. Homemade Hybrid Project. Update 2007-08-12 Big overpressurisation.
Worked like a bomb: Video (slow motion) HyperTEK Hybrid Kit. Amateur Rocket Motors - www.ukrocketman.com. Amateur propulsion systems / rocket motors are where the action is really at for many of the non-professional altitude attempts.
You need to develop skills in mathematics, physics, chemistry and in the case of hybrid and liquid propulsion systems, high pressure plumbing. If the propulsion systems are to be controlled, or you want to instrument them to obtain data (generally a good idea), a knowledge of electronics is a good idea too. As the altitude requirements go up, so do the costs of buying large rocket motors off the shelf. It gets to a point, where the price of a rocket motor off the shelf is out of the range of those in the non-professional rocketry community. At that point, the advantages of building your own amateur propulsion system are compelling. By far the safest rocket motors to construct are hybrid rocket motors. Warning In the U.K. it is illegal to manufacture solid rocket motors of ANY size, anywhere in the U.K., under the 1875 Explosives Act.
How to start. Online Forums.