parabolic

Hi,

 

Is there any members from NZ here or know what the amature pyro scene is like over there?

 

Lee

Just starting this thread as I was taking the other one off topic;

I'm seriously thinking about casting a resin block. I have plenty of tooling available but to make an aluminium clam shell for 3lb rocket tube will require 1.5inch bore or slightly more and 10 inch length of aluminum block. As we know alumimum is not cheap and boring a hole that long will be time consuming and just not pratical for me.
I also don't want really want to use plastic block due to cost too.

Has anyone or know of anyone that has made a resin clamshell before? and will it hold up to the pressure to keep the tube from splitting I know Dan williams made or had made for him resin bp puck die's

I won't be slicing it in half to make the traditional 2 piece clamp to remove the tube but instead will press the motor out after the last increment of fuel has been pressed.

Guys,

just trying to find some Lexan at the moment. I'm looking for a sheet or sheets of 450mm x 450mm for my press.

do I need to go for Lexan polycarbonate or Lexan EXELL D? EXELL D seems double price but I know when saftey is a concern I can't be doing things on the cheap.

if anyone has any laying around in UK give me a shout.

I have seen some on the bay and some other places. but thought I'd see here first.

Lee

Is there anyone out there with a list available that details what Kg/cm2 or PSI that various pyrotechnic compounds can be safely pressed too?

The only info I have found so far is on Rich Wolter's website
whistle rocket end burner 8800PSI
whistle rocket core burner 6500PSI
but nothing about BP rocket's?

I'm very interested on pressing BP rockets and the only info I can find on this is from a website which states;

"Black Powder has a fine line between compression and self ignition, pressures up to 900 to 1000 psi. are typical pressures for pressing but a slight increase in this pressure can lead to combustion".
Is there any truth in this?

Can anyone supply info on the safe pressing pressure for rockets and also comets? perhaps a list can be drawn up and kept as a sticky?

Any help would be much appreciated. (I have searched the forum but found nothing)

Well, its been about a year and a half since I last been on this forum, and a lot has changed. Richard well done you seem to be doing a great job with the board and with its nice new look!.
My shooting has taken over most of my life as I had spent alot of time practising for the Word F-class championships to be held at Bisley. My hobby of pyrotechnics had to take a back seat..... The event took place and now its past, and the best thing is....... it all paid of! The GB shooting team won gold! ! I'm so happy that I was picked to shoot for GB and to take part.

All the best guys and gals

Lee