Favorite plane never built (or perhaps as a prototype).

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I always liked the single-tail Liberator: https://militarymatters.online/wp-content/uploads/2022/10/B-24N.jpg
I believe maybe 7 were built
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Its Curtiss V-1570 engine was new to me. I thought Curtiss was solely a radial producer.
Curtiss produced several inline engine types, actually.

One of the most notable, was their aluminum V-1150.
Several engine companies were influenced by it's design, like Junkers, Packard and even Rolls Royce.
 
I'd like to have seen it developed into an advanced engine for the 1930s.
The way to develop an advanced engine for the 1930s was to throw it out and start over.
That sounds harsh but it was reality.
The two Curtiss engines were excellent in their day but they were designed for under 70 octane gas and the bearings and lubricants of the early 30s and using the steels and aluminum alloys (metallurgy) of the early 20s.
The V-1150 weighed around 670-700lbs and had no supercharger and no reduction gear (most models).
The V-1570 weighed around 740-1040lbs depending on model and accessories and reduction gear. Only supercharged using a turbo. it went through 31 models in US service and was never rated at more than 700hp for take-off. 73 octane fuel showed up in time for about the 20th version.

Sometimes you can modify things, sometimes you have to modify so much, a few parts at a time, you are better off starting over completely fresh.

If you want a 1200hp crankshaft, design a 1200hp crankshaft and don't try to modify/upgrade a 600hp crankshaft and /or try to figure out how many fixtures and cutting tools you can use from the 600hp crankshaft production set up to make the 1200hp crankshaft.
 

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