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UMS Gas Radial Engine Enthusiasts Rabbit Hole

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UMS Gas Radial Engine Enthusiasts Rabbit Hole

Old 05-19-2022, 02:51 PM
  #51  
David Jackson
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Just recently installed the UMS 260 five cylinder in a Hangar 9 40% SU-26. Currently in the process of fine tuning the carb. This engine will eventually be installed in a Balsa USA 1/3 scale Stearman which may not be completed before the end of 2023. Looking forward to comparing the performance of this engine to my Moki 250.
Old 05-19-2022, 08:35 PM
  #52  
partshunt
 
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What is the wingspan of the Stearman, also the projected weight for that model, UMS 260 Radial is big motor.
Old 05-20-2022, 03:25 PM
  #53  
okcrcpilot
 
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Originally Posted by partshunt View Post
What is the wingspan of the Stearman, also the projected weight for that model, UMS 260 Radial is big motor.
Wingspan of the BUSA 1/3 scale Stearman is 116" top wing, 112" bottom wing. Yes, 260 is a big engine. My PT-17 weighs in at 64lbs. wet but I have added a LOT of extras to it and I'm glad to have all that muscle up front.
Old 06-06-2022, 10:19 AM
  #54  
David Jackson
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Curious to know if anyone is running the UMS 260 five cylinder engine. If so, would you be so kind as to share low and high needle valves settings.
Old 06-06-2022, 02:12 PM
  #55  
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Originally Posted by David Jackson View Post
Curious to know if anyone is running the UMS 260 five cylinder engine. If so, would you be so kind as to share low and high needle valves settings.
David,

I don't have the five cylinder (mine's the 7) but I set the needles to what is recommended in the engine manual. I have never had to adjust them, even after having many flights on the engine.

Gary
Old Yesterday, 04:28 AM
  #56  
karolh
 
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Subscribed !!
Old Yesterday, 09:55 AM
  #57  
okcrcpilot
 
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Welcome to the UMS Gas Radial Engine Enthusiasts Rabbit Hole forum, karolh. LOTS for good info here and MAXAM is the go to guy for anything radial.
Old Yesterday, 10:07 AM
  #58  
partshunt
 
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Karolh, which size is your seven cylinder. I ask because on the 7 cylinder 50cc , comes with UMS carb, or you can get the Walbro carb. Is yours seven cylinder bigger with the Walbro carb, gasoline engine?

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