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There is more than one. There is an airplane operating in California, for NOAA I believe, with a single turbine engine in the back, and sensor equipment where the front engine used to be.
There is/was also an outfit at Kalispell Municipal (Montana) that converted a 337 to a single turbine engine in front, and put the batteries and luggage space where the rear engine use to be.
It seems like you are referring to an O-2 conversion. I don't know if the NOAA airplane was originally an O-2 or not, I know the Kalispell airplane was a 337 to start with.
Sorry, I am not much good for information like this, but if these breadcrumbs are of any use, you are welcome to them.
Kevin
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