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Gear Doors
If you are single engine, and operate the gear, opening the doors, you will experience a negative rate of climb. On one accident, as I remember it, the pilot cycled the gear shortly after takeoff, and the resulting negative rate of climb caused the accident. I think, have to look, that it is not just diminished by 250 FPM, that it is actually -250 FPM, for the 10-12 seconds to cycle.
Also, take note, that in 69, it was possible to get gear pumps on both engines. Mine has that, as does Jenny Stack's plane. It doesn't make anything work faster, just gives you the ability to cycle the gear with either engine running.
Of course, taking off with one engine not working is always a root cause. Another thought, however, is that these are reported accidents, and I know that in the Cessna ads of the time, they did get one off the ground with one engine feathered.
Which brings up an interesting point. If you can't get the engine started, how can you feather it?
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