Why not an old fashioned pipe bomb
6-8 inch threaded steel
Packed with either style gunpowder
Screw caps
Coated with projectile crap
Presto cooker seems like far less explosive compression than capped pipe....even worse than glued pvc
Lol...I know just who to ask?
Happily most IED builders die in their attempts to self educate. made my job a lot easier in EOD. That said do not try this shit at home people.
http://www.5nr.org/downloads/notice/PotentialTerrorist.pdf
Different vessels are either stamped w cheap methods or cast. I own a pressure cooker handed down for a few generations that may have been cast then turned on a lathe that is stainless steel.
As a pipe has threads any loose powder in said threads usually / hopefully kill the angry untrained builder versus a skilled IED engineer that knows not to let his bulk propellant be poured .
Acetone peroxide, pour boy anfo , black powder, smokeless, Et cetera.... Even bulk firecrackers when contained and allowed a containment vessel such as pipe or pressure cooker increase an IED’s lethality as the explosives basc brisance can be amplified, directed in same manner any military ordnance can with the addition of fragments.
http://en.wikipedia.org/wiki/Brisance
All carefully considered, along with speed of construction from easily available components etc etc ... A monster pressure cooker such as this one...
... can be a bitch of a killer when properly constructed as an IED . My small backpacking presto pressure cooker stamped in china from a old Chevy bumper scraped.... Not so much as a pipe bomb IMO and experience.
Detonation velocities be based on TNT being a 1. C4 being a 1.34. military Dynamites being around .80 on the scale and ANFO being .60 as a general rule. Exotics such a PBX explosives generally unavailable kick to the top of said scale with their use primarily in special weapons and specialized shape charges.
I saw the colors of the race IED and was reminded of the color of tannerite used by special effects weenies on TV shows such as sons of guns. Same colors as the race bomb IMO . Tannerite and other exploding targets are subject , when mixed properly and in a timely manner, need a blasting cap or high impact from rifle fire to properly detonate. A pressure cooker bomber usually doesn’t have a proper blasting components such as dets, blasting caps, electric bridge wires etc ... So improvised we must go. Be it chemical or mechanical.
Any number of possibilities is out there.
A skilled individual can walk down three aisles or less at a big box store and mix enough commercial components as they shop to injure or kill if they desire to do such.
Stay Safe ..... Or try.