aviatoreb Posted July 6, 2020 Report Posted July 6, 2020 1 hour ago, EricJ said: It would be a lot of work, so I think a PT-6, which is very similar to a Walter, would probably be worth it if one were to go to all the effort. There are multiple examples out flying around of Cessna 340s that were converted from twin reciprocating engines to single turbine engines. If people pull that off I'm sure converting an M22 to turbine could be done. Still a lot of work, though. Other than mounting and cowling the engine, the entire fuel system, tanks, pumps, pipes, etc., needs to be gone through, and turbine fueling and management is significantly different than avgas due to water and biological issues. Is that two props on one shaft I see on N4571L?! An inline twin ending turbine? Now that sounds interesting! Or is it just an illusion of the photograph? What a neat idea otherwise converting a Cessna 340 to a STEP. Experimental, right? I bet its a nice plane. BTW I typed N4571L into google and I came up with this desk model!...from before the conversion. https://www.modelbuffs.com/index.php?page=final&cat=pri&id=771
Guest Posted July 6, 2020 Report Posted July 6, 2020 4 hours ago, Igor_U said: Clarence, Does TC allow installing different engine on OMC aircraft? My recollection says no but could be wrong. M22 is not on the list but M20 to B are... I’m not really sure what limitations TC puts in place. I look after a Piper Cherokee in OMC, but we treat it just like any other certified airframe. Clarence
carusoam Posted July 7, 2020 Report Posted July 7, 2020 Erik, Expect that a special gear box is used to deliver counter rotating shafts for the two props... Somebody wanted to remove all the torque and power offsets.... that came with the original twin engine set-up... A good part of turbine technology is gear box tech... the turbines are turning 10s of thousands of rpm... and the prop is only turning 2500rpm... rough estimates... Having an engine built specifically for one project must be awfully expensive... Best regards, -a-
aviatoreb Posted July 7, 2020 Report Posted July 7, 2020 14 minutes ago, carusoam said: Erik, Expect that a special gear box is used to deliver counter rotating shafts for the two props... Somebody wanted to remove all the torque and power offsets.... that came with the original twin engine set-up... A good part of turbine technology is gear box tech... the turbines are turning 10s of thousands of rpm... and the prop is only turning 2500rpm... rough estimates... Having an engine built specifically for one project must be awfully expensive... Best regards, -a- Is that two engines driving the shaft - or is it just one?
carusoam Posted July 7, 2020 Report Posted July 7, 2020 Expect just one... This keeps the timing of everything adjustable, but locked in place mechanically... The yaw of many hundreds of horses on T/O must be interesting.... Having opposite rotating props should balance things out pretty well... All guesses on the part of a PP... my twin shaft corotating and counter rotating machine experience is limited to industrial machinery of a few hundred horsepower.... Best regards, -a- 1
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