Very interesting points! Agreed on diameter, given OTL foreign designs were so much narrower. < 50.5" seems plausible.
Also I agree the ALT Taurus wouldn't be worth it if you have the functioning ALT Hercules. An over-bored Pegasus might still make sense, but would make the ALT Taurus even more...
Very interesting! Never even heard of the Hydra
25.7 L
850 HP
46.5" diameter
5" x 5" bore and stroke
If development had continued what sort of HP do you reckon it could've gotten up to?
Well, yes sort of. Or an Alfa 135/136. But also not quite.
Mainly I'm looking for spec estimates, e.g. anyone have a guess what the bore and stroke of a 14-cylinder Mercury would be or the displacement of a twin Pegasus?
The consensus in a lot of threads was that 4vpc was unnecessarily complicated and didn't give a lot of benefit. And other (foreign) Bristol Titan (or Mercury) derivatives reverted to 2vpc successfully apparently, which made twinning easier from what I understand.
I made that stipulation since...
I'm considering Kaiserreich-esque Alt Hist timeline where Canada + a bunch of British exile engineers have to build aero engines -- for speed of development, reliability, and simplicity they just develop the Bristol Mercury/Pegasus, avoid sleeve valves and stick with poppet valves, and also go...