OS46SF Diesel
09-21-2014, 12:40 AM
#1
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OS46SF Diesel
09-21-2014, 02:43 PM
#4
Nice work, Jef!
What RPM range were you getting? ...on which prop? ...fuel?
I played with a few of these several years back. Brief break-in on glow fuel - to where the initial metal-dirty exhaust ran clean and starting by hand was sure and easy. Then DDD head and Davis ABC fuel. 11" to 13" diameter, 6-ish and deeper pitch props.
Very nice combo.
OS stock P&L are ABN, so medium low oil % worked fine. I don't recall the exhaust being that juicy. (You use a nice extension rig, too!)
Stock OS carb proved to have better economy than another make, even with a case-pressure operated pump.
Engines definitely showed RPM plateau at about 3/4 throttle: wider open, no RPM gain but wetter exhaust and quicker fuel consumption. I didn't fly any of the engines I worked on, but the guy I did them for had good in-air performance.
What RPM range were you getting? ...on which prop? ...fuel?
I played with a few of these several years back. Brief break-in on glow fuel - to where the initial metal-dirty exhaust ran clean and starting by hand was sure and easy. Then DDD head and Davis ABC fuel. 11" to 13" diameter, 6-ish and deeper pitch props.
Very nice combo.
OS stock P&L are ABN, so medium low oil % worked fine. I don't recall the exhaust being that juicy. (You use a nice extension rig, too!)
Stock OS carb proved to have better economy than another make, even with a case-pressure operated pump.
Engines definitely showed RPM plateau at about 3/4 throttle: wider open, no RPM gain but wetter exhaust and quicker fuel consumption. I didn't fly any of the engines I worked on, but the guy I did them for had good in-air performance.
09-22-2014, 09:58 AM
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Nice work, Jef!
What RPM range were you getting? ...on which prop? ...fuel?
I played with a few of these several years back. Brief break-in on glow fuel - to where the initial metal-dirty exhaust ran clean and starting by hand was sure and easy. Then DDD head and Davis ABC fuel. 11" to 13" diameter, 6-ish and deeper pitch props.
Very nice combo.
OS stock P&L are ABN, so medium low oil % worked fine. I don't recall the exhaust being that juicy. (You use a nice extension rig, too!)
Stock OS carb proved to have better economy than another make, even with a case-pressure operated pump.
Engines definitely showed RPM plateau at about 3/4 throttle: wider open, no RPM gain but wetter exhaust and quicker fuel consumption. I didn't fly any of the engines I worked on, but the guy I did them for had good in-air performance.
What RPM range were you getting? ...on which prop? ...fuel?
I played with a few of these several years back. Brief break-in on glow fuel - to where the initial metal-dirty exhaust ran clean and starting by hand was sure and easy. Then DDD head and Davis ABC fuel. 11" to 13" diameter, 6-ish and deeper pitch props.
Very nice combo.
OS stock P&L are ABN, so medium low oil % worked fine. I don't recall the exhaust being that juicy. (You use a nice extension rig, too!)
Stock OS carb proved to have better economy than another make, even with a case-pressure operated pump.
Engines definitely showed RPM plateau at about 3/4 throttle: wider open, no RPM gain but wetter exhaust and quicker fuel consumption. I didn't fly any of the engines I worked on, but the guy I did them for had good in-air performance.
Last edited by jef-lemmens; 09-22-2014 at 10:07 AM.
09-22-2014, 10:04 AM
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09-26-2014, 10:06 PM
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12-14-2015, 11:47 AM
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12-15-2015, 11:30 AM
#17
I do the same thing if I'm breaking engines in at home. Makes a huge difference in noise. You just don't want the hose dipping into the water. That is if you're using muffler pressure to the fuel tank.
