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DRONE .40 Diesel

Old 02-23-2017, 05:43 PM
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Dan Vincent
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Default DRONE .40 Diesel

Back in the mid-90's Frank Anderson asked me to take some pictures of a Drone .40 diesel.

I ran across this leftover shot of the .40 with a .29,

From what I remember, Leon built two of these engines and one was campaigned by Hal DeBolt in a UC Stunt Model.

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Old 02-27-2017, 04:34 PM
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I think a .49 and not a .40 Jack
Old 02-27-2017, 04:58 PM
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Dan Vincent
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I was told it was a 40 but who knows? I know a McCoy 49 was a lot thicker than a .29 so from comparing the two Drones they looked fairly close. It did have a long stroke so maybe that's where the displacement gain was made.

Perhaps some Drone experts who knew Leon or Hal might have some details.
Old 02-27-2017, 09:56 PM
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Text from the article The Drone Story.
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Old 02-28-2017, 04:47 AM
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Thanks for that, I thought a .40 was not a typical displacement for that period.

my only other question was the number made. I was told there were two, one campaigned by Hal DeBolt and the other one was kept by Leon. My picture is of Leon's engine, I don't know for sure if another one exists.

My intention was to show this engine existed.
Old 03-01-2017, 03:03 AM
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Default Drone BB Version

I have a couple of the Drone .29 ball bearing versions. This one with an Aerodyne variable compression head. Jack
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Old 03-01-2017, 03:07 AM
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Default Drone .29 Ball Bearing Version

Here is one with the stock head. Jack
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