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Dolbeer Steam Donkey (Les Proper Design)

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Rledoux313:
Tonight I was able to get my steam donkey project to successfully run on steam!  :cartwheel:

I’ve been working on and off for almost 2 years on this, and have learned much more than I could have hoped for! The plans for this can be found in LSOR 2018 issue 3/4/5, those issues are in the digital library on village press and can be read if you have a subscription.

Here is a video, and some photos. The eagle eyed among you may notice that the photos show the connecting rod attached to the crank with an eccentric, while the video has a crank pin. When I was building the engine and running it on air I bent the crank rod, likely due to the wrong timing and too much air. This caused me to go the route of the eccentric so I could have the third crank bearing. After having trouble getting it to run I got in touch with Les and he advised changing that to a crank pin. That change, along with denatured alcohol in the fuel pan instead of sterno gel was enough to get it running.


http://www.youtube.com/watch?v=V-wdUCY6A44

crueby:

--- Quote from: Rledoux313 on August 31, 2026, 01:30:15 am ---Tonight I was able to get my steam donkey project to successfully run on steam!  :cartwheel:

I’ve been working on and off for almost 2 years on this, and have learned much more than I could have hoped for! The plans for this can be found in LSOR 2018 issue 3/4/5, those issues are in the digital library on village press and can be read if you have a subscription.

Here is a video, and some photos. The eagle eyed among you may notice that the photos show the connecting rod attached to the crank with an eccentric, while the video has a crank pin. When I was building the engine and running it on air I bent the crank rod, likely due to the wrong timing and too much air. This caused me to go the route of the eccentric so I could have the third crank bearing. After having trouble getting it to run I got in touch with Les and he advised changing that to a crank pin. That change, along with denatured alcohol in the fuel pan instead of sterno gel was enough to get it running.


http://www.youtube.com/watch?v=V-wdUCY6A44

--- End quote ---
Excellent!!  Great work, runs very well.   :ThumbsUp: :ThumbsUp:


Whats the burner? Alcohol?

Zephyrin:
nice little model, congratulations, and did you also make the crown gear under the large horizontal flywheel ? I'm looking for a way to cut gears like that.

Sanjay F:
Very nice, well done, it looks and runs great!  :ThumbsUp: :ThumbsUp:

Spinner21:
Nicely done, lovely to hear engines actually running on steam.

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