5' PVC Missile: Scratch/Building a High Power Rocket: Part 8? Delay assembly and Motor Test

This is part 8 of the documentary. Assembly of the delay grain, mechanical deployment system and motor static test. The first motor contains flexi-fuel and the second, Alien R-Candy.

Category:

Science & Technology

Tags:

• R-Candy
• rcandy
• rockets
• rocketry
• Estes
• hobby
• high power
• how to build
• pvc

[1crackit]

if i put a larger amount of r candy like say 250 grams how much will it burn and will the pvc melt

[rocketmanbkk]

@1crackit : The pvc will soften as it is heated up. If it melted you would not have a working motor. If you use more fuel you have to make sure your casing can handle the chamber pressure. The easiest way to do this is to enlarge your nozzle throat. To large a nozzle and you have too little chamber pressure (a big smoke bomb vs a rocket motor)

[456ner]

how do you make those igniters? ive tried everything to get my core burning motor to light.

[rocketmanbkk]

@456ner : Video no. 6 in the series shows how I make the igniter.

[oliwic]

Nice idea for the delay grain/deployment system, but did you know that if you add some bicarbonate of soda to the delay grain mix it slows the combustion of the delay grain, and also try adding some powdered dye (rit dye) to the fuel/delay mix as it colors the smoke and is good for tracking smoke (orange and blue work best).

[rocketmanbkk]

@oliwic : can't get the dye in Thailand but baking soda is no problem. Thanks for the reminder. Great thing with this design is I can literally make the delay grain as long as I want.

[2012goingNutz]

great idea.

[rocketmanbkk]

@AHGlasher : I test every system before launching. There is more than enough pressure to push the parachute out. I don't know how to link these videos so sometimes they are hard to find. The last video in this series is:

"How to Build a High Power Rocket: Final Video-The Launch"

[AHGlasher]

Nice idea for the deployment system, and it may be too soon to ask this, but it didn't seem to be powerful enough to deploy unless your foward velosity is near zero and pressure on the nose cone is reduced as well. I'll continue to watch and see.