Meanwhile I got a stinger tool, I always wanted stingers and made some experiments in that direction.
But making experiments with whistle was always a second objective.
My second, slightly slimmed spindle (1lb) is 5,5mm x 28mm.
Set up as a normal rocket with WM and a 60g salute on top they are great fun.
But the salute is not the main effect - it's the liftoff scream. It's a real homemade Nebelwerfer.
The scream is so load that you can hear the echo from faraway tree lines
The salute is not really important...
When the spindle is between 1.5-2x the tube diameter it also gives a unique descending tone, just like a bomb dropping in a cartoon. I love it.
Indeed. But not like a bomb dropping, it's something else...
Unfortunately it's not very powerful and burns a lot of precious perchlorate for little payload.
Extend the chamber by X2
That's what I tried - and it had zero effect. The core geometry is the key, at least that's my current conclusion (any objections to this?).
Edited by mabuse00, 24 September 2022 - 02:46 PM.