Os 40la
08-13-2003 | 12:48 PM
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From: Roseville, CA
Os 40la
15% Wildcat
12x6 APC prop <---(Typo is actually 10x6)
apx 250ft above sea level
stock muffler with rubber deflector pipe
apx 30-40 flights
11,400 RPM run at 11K
Runs about 200 - 400 RPM slower with a Master airscrew. 5% Nitro cuts RPM down to the low 10's and runs high 9's (Sounds like quarter mile times.)
12x6 APC prop <---(Typo is actually 10x6)
apx 250ft above sea level
stock muffler with rubber deflector pipe
apx 30-40 flights
11,400 RPM run at 11K
Runs about 200 - 400 RPM slower with a Master airscrew. 5% Nitro cuts RPM down to the low 10's and runs high 9's (Sounds like quarter mile times.)
08-21-2003 | 11:30 AM
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From:
Os 40la
Are you sure this is correct?
My OS .50sx turns the APC 12X6 at 10500 when tuned for flight.
Probably a couple of hundred more max. (10%nitro)
I have also read that the Irvine .53 turns the same prop at 10700.
My OS .50sx turns the APC 12X6 at 10500 when tuned for flight.
Probably a couple of hundred more max. (10%nitro)
I have also read that the Irvine .53 turns the same prop at 10700.
07-17-2009 | 12:27 AM
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From: Mount Laurel,
NJ
RE: Os 40la
ORIGINAL: EagleOne
Anyone know the RPM of .46 LA with an 11x6 MA prop??
Anyone know the RPM of .46 LA with an 11x6 MA prop??
I got9800 with an APC 11x6, 10% Cool Power, 70F, 65%RH. That was the 2 tanks on the break-in runs though. Got about 10400 leaned out to almost max. Too much prop for it. I haven't run it with the 10X5 APC or the 10X6 MA's I'll fly it with. Ididn't have them at the time
01-07-2010 | 02:00 PM
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From: Topeka, KS
RE: Os 40la
OS 40 LA
MAS 10x6
Morgan Fuel Omega 15%
17% oil 30/70 castor/synthetic
OS 8 plug
38 deg F, dew point 18 deg F, density altitude approx 750' below sea level
Stock muffler, no baffle, long (~3') rubber hose extension (to keep the neighbors happy)
Mildly ported sleeve
12,900rpm tuned for flight (3 clicks rich, probably -300 rpm)
I'll try to post the numbers with no extension and peaked when I get a chance.
MAS 10x6
Morgan Fuel Omega 15%
17% oil 30/70 castor/synthetic
OS 8 plug
38 deg F, dew point 18 deg F, density altitude approx 750' below sea level
Stock muffler, no baffle, long (~3') rubber hose extension (to keep the neighbors happy)
Mildly ported sleeve
12,900rpm tuned for flight (3 clicks rich, probably -300 rpm)
I'll try to post the numbers with no extension and peaked when I get a chance.
01-28-2010 | 09:52 AM
#9
RE: Os 40la
ORIGINAL: Steve108
OS 40 LA
MAS 10x6
Morgan Fuel Omega 15%
17% oil 30/70 castor/synthetic
OS 8 plug
38 deg F, dew point 18 deg F, density altitude approx 750' below sea level
Stock muffler, no baffle, long (~3') rubber hose extension (to keep the neighbors happy)
Mildly ported sleeve
12,900rpm tuned for flight (3 clicks rich, probably -300 rpm)
I'll try to post the numbers with no extension and peaked when I get a chance.
OS 40 LA
MAS 10x6
Morgan Fuel Omega 15%
17% oil 30/70 castor/synthetic
OS 8 plug
38 deg F, dew point 18 deg F, density altitude approx 750' below sea level
Stock muffler, no baffle, long (~3') rubber hose extension (to keep the neighbors happy)
Mildly ported sleeve
12,900rpm tuned for flight (3 clicks rich, probably -300 rpm)
I'll try to post the numbers with no extension and peaked when I get a chance.
02-02-2010 | 05:48 PM
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From: Aurora,
SD
RE: Os 40la
OS 40FP
APC 12.25x3.75 @ 10400 peaked.
APC 10x6 12000 peaked.
Byron's 10% fuel. 30°F or so barometer 30.12".
This engine may be slightly modified. I received it 3rd hand and runs better than any other FP I have run. It is an old iron sleeve engine. I just ran it on the stand to see if it was strong enough to go on my Modeltech Magic Extra 300l and then found this thread...I guess I am going to give it a try. The K&B 61 Twister I was going to use won't fit in the Magic Extra fuselage.
APC 12.25x3.75 @ 10400 peaked.
APC 10x6 12000 peaked.
Byron's 10% fuel. 30°F or so barometer 30.12".
This engine may be slightly modified. I received it 3rd hand and runs better than any other FP I have run. It is an old iron sleeve engine. I just ran it on the stand to see if it was strong enough to go on my Modeltech Magic Extra 300l and then found this thread...I guess I am going to give it a try. The K&B 61 Twister I was going to use won't fit in the Magic Extra fuselage.
