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FYI, I took my '73 P337 to 12,500 today, and (after cooling it a bit), reduced power to the rear engine to idle. This gave me 1900 RPM on the rear engine, which the book says is the same thrust as feathered. Something seems wrong about that, maybe it would have eventually slowed down such that I needed to put some power back in to maintain 1900 RPM, but anyway...
I was easily able to maintain altitude with only climb power (31/2500) on the front engine, not even full power. I let the airplane coast down in speed for five minutes, and it had seemed to stabilize in level flight at blue line and climb power.
I chose to cage the rear engine rather than the front (which is your example) because the front is not quite as efficient as the rear, and I wanted worst case.
Gear and flaps were up.
If you were operating at only 8000 feet, something is VERY wrong. Were you getting full MP (35", if I remember right) at full RPM on the rear engine?
Perhaps someone else on the site will have a suggestion...
Kevin
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