It's all trial and error

Are you running sims on Richard Nakkas xlm?

No

He has the best data base for r candy

Once I started making more powerful rocket candy I was plagued with nozzle blowouts

Ah gotcha, probably had tight throughts

I usually make throats 1mm bigger than deisgned for testing

Prevents CATOs

So I capped the ends and then packed clay. That resulted in it going up about 50 feet, then exploding

Wait are you making clay nozzles?

I was making my nozzels the exact size of the fuse

I just started to experiment with other stuff

But basically, yes. Still on clay

http://www.nakka-rocketry.net/th_nozz.html

I don't have the capability of making metal ones

Haha don't worry my man

I got you covered

Been developing carbon/metal composed adhesive composites for non machinable SRMs

And 3D printed mandrels

But the last test I did was a PVC engine (3/4) but I capped the end, then packed with clay, then fuel, then clay, then cap again. Drilled the nozzel through the cap and clay

It was a flying IED

No recovery charge

I make rockets out of pool noodles and anything laying around, so I don't care if I lose it, although that's not preferable

I don't recommend PVC

Have you seen what it did to a lot of rocketers

It's X-ray transparent

So shrapnel wounds meant they can't get em all out at the ER

I normally wrap them so if they should explode they won't send shrapnel everywhere

https://photos.app.goo.gl/F1bkCuVPrVwrFQt58

I was teaching my nephew how to make them

This is from last year

It's just a powdered fuel... Not solid

Wow that flew really high

Yeah, my powder engines work well, but I want that lift sucka

Ammonium perchlorate

And aluminum poweder

Almost double the impulse

https://photos.app.goo.gl/uHTGXdu1Tr2nzYQt8

This was the most recent failure

Lol