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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Engine Manufacturers Direct Support Forum >> O.S. Engines Support >> Old OS61 SE pattern engine
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Old OS61 SE pattern engine - 12/23/2012 12:53 AM   
Yak13


 

Posts: 190
Score: 106
Joined: 7/8/2003
Last Login: 5/18/2013
From: Phoenix, AZ, USA
Status: online 		 I am using an old (very good condition) OS .61 SE long stroke pattern engine with Macs tuned pipe. Using 10% fuel and 11x11 prop. Contrary to what I expected the plane was fastest when using the 11x11. I am getting 11,450 rpm static. If I want to increase max speed should I look for a higher rpm setting of prop/pipe? 
What is the highest and recommended nitro percentage? I tried YS20/20 and lost 300rpm.
Thanks a lot,
Ed

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RE: Old OS61 SE pattern engine - 12/24/2012 3:06 PM   
Bax


 

Posts: 17283
Score: 169
Joined: 4/26/2002
Last Login: 5/17/2013
From: Champaign, IL, USA
Status: offline 		The O.S. long-stroke engines should be propped so that they turn in the mid-to-high 11,000's when leaned to just rich of peak RPM on the ground. Your engine sounds like it's running about the right RPM. They have been propped closer to 10,000 RPM for Pattern. A typical Pattern prop of that era was an APC 12 x 12 propeller. RPM would get into the mid-9,000's with a pipe.

To slow a model with the engine, you'll need a lower-pitched propeller. That means more diameter to keep the RPM in range. The long-stroke series of O.S. engines did not like higher RPM ranges, so keep it below 12,000 RPM, and you'll be OK.

_____________________________

Bill Baxter, Manager Hobby Services/Futaba Service/North America
3002 N. Apollo Dr. Ste. 1 Champaign, IL 61822 USA
Service Phone: 217 398-0007
Email: hobbyservices@hobbico.com

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RE: Old OS61 SE pattern engine - 12/24/2012 4:07 PM   
Yak13


 

Posts: 190
Score: 106
Joined: 7/8/2003
Last Login: 5/18/2013
From: Phoenix, AZ, USA
Status: online 		Thanks Bill.

Would you happen to have the power curves for this engine?

Thanks again,

Ed 

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RE: Old OS61 SE pattern engine - 12/26/2012 3:38 PM   
Bax


 

Posts: 17283
Score: 169
Joined: 4/26/2002
Last Login: 5/17/2013
From: Champaign, IL, USA
Status: offline 		O.S. never released graphic information on their engines. We'd not have a power curve. In older magazines, the power curves you may have seen were made by the person who wrote the engine review. They did their own dyno testing.

_____________________________

Bill Baxter, Manager Hobby Services/Futaba Service/North America
3002 N. Apollo Dr. Ste. 1 Champaign, IL 61822 USA
Service Phone: 217 398-0007
Email: hobbyservices@hobbico.com

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       Post #: 4

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All Forums >> Glow Engines, Gas Engines, Fuel &amp; Mfg Support Forums >> Engine Manufacturers Direct Support Forum >> O.S. Engines Support >> Old OS61 SE pattern engine
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