BiTurbo, I'm puzzled!   If you have an physical Triumph plate, you could mark out an adaptor by drilling though that onto the blank. I have some six-cylinder plates you could have, but don't know if they are the same as on a Spitfire. John

This one?   See from 3:30 in. Sad to say, I've never seen those covers in use!   John

Think boiler explosion….. The Blackcap incident sounds a bit spicy! Youngest brother is a fire protection engineer and has some interesting tales of destruction, initially involving LPG cylinder fire tests, one of which sounds rather similarly sketchy. He had a brief outing on Tomorrow’s World with video of a trial of an LPG cylinder protection container he’d developed (sorry, I’ve failed to find it). There’s also a tale of the public (and entirely intentional) cremation of a brand new and fully fuelled LNG Volvo at an exhibition in Sweden, where the organisers had completely failed to appreciate the scale of the “flamethrower effect” of the pressure relief valve….. averted by himself intercepting couple of spectating senior firemen just as the kerosene was being lit and convincing them that things were about to get ugly. This resulted in a very hurried extending of the perimeter. More recently he’s been blowing up large EV battery packs, which has resulted in the complete destruction (unintentional!) of at least one shipping container.

For me, a book on Triumphs 😁

I hope you all see the analogy of the above to raising the CR of your engine!   And at lesser degree than Colin, memories of youthful experiments with home made explosives (only fireworks, officer!)  aka pipe bombs.    I won't mention the recipe! John

Oh what fun. Thing that got me with the can of beer on the bonfire is that it was a can of beer. And and theoretically non-explosive . OK, as in 'Four Yorkshiremen'... This is a RN vertical launch Seawolf missile, the bottom half is the Cadiz booster that gets it out of the magazine cell and pointing on the way to the target - thrust vectoring, very cool. The top half is the missile itself which is powered by a Blackcap solid rocket motor which will get the missile up to about Mach 3. Where I worked we had had an incident with a quantity of rocket propellant going on fire (nasty) and needed to to a trial to see how big a burn would occur if a full 20 odd kg of uncontained Blackcap motor went off. I was there with our Safety Officer when we did the trial. Theoretically uncontained the thing shouldn't have gone anywhere, as it was open at both ends, theoretically anyway. We started off standing about 30m away when we ignited it. Then as it got going the bloody thing started to pulse like a V1 jet engine, alternating end on end, blowing down the containing walls and then starting to jump about the range as we all took ever larger steps back. Even at the best part of 60m or so you could feel the heat of the thing through gloves. Great fun once it actually stopped.

Similar effect obtained when the carpenters disposed of their supposedly empty nail gun gas cartridges in the site bonfire. No bonfire on our property but bits on a few gardens beside us.

I remember experimenting with aerosols when I was a kid. A near empty deodorant can in a bonfire created enough of a bang to cause minor devastation. But with some refining, we eventually created an "interesting" missile. An aerosol can of lighter gas (seemed to make sense at the time) mounted on a small crude launch ramp. Then a small fire set just under the valve. Said valve melts, gas escapes and off the can went. In a not very predictable way. We all were surprisingly sensible and had moved a distance away and behind a fence. Just as well as it turned out! Ah, the joys of yoiuth.

Mild anxiety……? Nothing mild about it! This is a U-shaped (ish) arrangement requiring two almost full lengths and a short section. It’s the two long lengths that need most of the jointing work….. obviously…. The discovery (after forming the first joint!) that the worktop we have is actually 620mm and template is for 600 or 616 didn’t help and extended the process, though happily it was fixable. PVA. And will silicone also on final assembly. Did this with a small metal screw-top cocoa tin with a little bit of petrol in it.  We (small posse of pre-teen kids) had a small bonfire going, which was completely obliterated when the “bomb” went off. Was a helluva boom. Mum came out to se what was going on “thought you had a bonfire?” Errr…..

I use both