Running Continental IV-1430 Hyper Engine form WWII

[Tom Fey]

Only 23 of these inverted V12 engines were manufactured, 6 engines survive, and only one survivor runs. The IV-1430 powered the XP-49 and the XP-57 without success in either installation, but it was an interesting endeavor brought to life by the restoration efforts of historian and author Graham White. History and run video here:
View: https://youtu.be/W8Os6WQ-x7g

 

[MIflyer]

Yes, and it was VERY LOUD! No mufflers on that thing!

 

[spiralcopter]

It is my understanding that while this engine basically was a failure as an aircraft engine, the program was not a total waste. Some of the design features and experience were re-used by the Continental team when designing the AV-1790 and later AVDS-1790 tank V-12s, which were some of the most widely produced and successful Western tank engines.