First flight of 24mm E-eX sugar motor

Here is a short video showing the first flight of my homebuilt 24mm sugar motor. Rocket owner Simon does the count down and pushes the button.

Category:

Science & Technology

Tags:

• EX
• knsu
• sugar
• motor
• model
• rocket
• rocketry
• experimental
• sweden
• nozzle
• happy

[BolderDamn1]

I have a good delay material made of air float / kno3/ and sulphur. My main problem is that when the fuel ignites it seems my delay fuel ignites at the same time due to the 5 mm" core. How can I get around that? Hope you can help.

[balltip]

@BolderDamn1 The delay should be massive, no core hole. I just mention that, if I get you wrong I'm sorry.

When my motor burns, the delay burns with the fuel grain, all the way from the start. As the delay element works as a simple fuse, and in effect is an end burner, approx. 10mm burns during the thrust phase. The 20mm lenght that remains when the motor grain has burned creates the actual delay. Just look at any Aerotech RMS motor and you get the idea.

[BolderDamn1]

Can you explain how you made the delay?

[balltip]

@BolderDamn1

The delay element is nothing but a short end-burning piece of KNSU. I spice it up a little by adding some FeO2 as a cathalyst. The delay element is housed inside a small diameter paper tube (T2 - for micro rockets) and sealed on the outside using rubber o-rings. It is tricky getting the molten KNSU into the small paper tube but i say "metallic syringe" and "make one on the lathe" to give you some clues. It's harder making the delay elements than the actual fuel grains due to size.

[david1513]

@BolderDamn1 dont drill the core more then half way though it

[david1513]

i liked that Lounch thank you for posting it,

[BolderDamn1]

I only have a core in the fuel grain which is a 3/4" PVC pipe about 5" long.(schedule 20 wall). I have been pouring my KnSu 65/35 directly into that pipe. Then I add the delay powder after it cools and pack it. Last I pack a small amount of SONIC powder for the charge. Maybe I am not using enough delay.

[stone4x4]

Congratulations for a great flight!