txfirefighter628
Registered User
Brownwood, TX
What parts are different between a c and c1 o235? Is it legal to upgrade a c to a c1 on a certified pa-12? Does it require a STC or just a 337?
This is the TC for the engine http://rgl.faa.gov/Regulatory_and_G...0A059B37AC25DF6786257B63006B66B9?OpenDocument Click on the pdf.Does that make it 115 HP by allowing higher rpm?
Had a C for awhile and then a C1. Same plane and prop. No noticable performance difference.
Found this in a O-235 manual
View attachment 20050
That would be expected when operating at the elevations of Utah. At 7,500 feet you would have had only a maximum of 75 hp available, more likely less. A loaded PA-12 is no ball of fire at sea level.My PA-12 had an O-235-C1 when I bought it. It was a total dog. I had to circle to get to pattern altitude that first summer in Utah, with 7,500 density altitude. Upgraded to a 150 hp O-320 and later to an O-360 and never looked back.