Lycoming 0-145

[Dan1940Chief]

The 65LB is also the military L-3G and is the same as the 50/65LA except minor structural changes and engine installation. The 65LB (L-3G) is authorized for the Lycoming 0-145-B2 and the O-145-93. Check Type certificate A-702.

Doug

Interesting... maybe I should paint it green...

[Rodney Zapf]

The 65LB is also the military L-3G and is the same as the 50/65LA except minor structural changes and engine installation. The 65LB (L-3G) is authorized for the Lycoming 0-145-B2 and the O-145-93. Check Type certificate A-702.
Thanks for clearing that up! I have the 1941 Chief 65 LB.
Doug

[Rodney Zapf]

Some time ago I published a post that had to do with the static thrust of the 0-145 measured with a scale. My 0-145 with a 70" X 36" prop would pull 250 lbs of static thrust on a 78 degree day. I recently purchased a 70" X 32" prop and measured the static thrust today (similar temp and Baro.) The new prop developed 283 lbs of static thrust. It sure makes a difference on climb-out, much much better! I run it at about 2400 rpms for cruise, This prop will make 2600 rrrr's if I let'r go! As you can tell, I am really happy with the change. Rod

[joea]

Rod,

Funny thing is that it even varies from one prop to the other. Friend of mine, Gareth Gilson, has a Sensenich wood prop on his Sedan. He needed to get a second prop to save the original, which was on the airplane when delivered new. The second prop is the same size, model and pitch yet he insists that you can feel a big difference between the two.

Glad you found one that works well with the plane and engine!

Joe A

[Rodney Zapf]

Due to minor warpage etc. I can see where it would vary from prop to prop even with the same original pitch and diameter. I was certainly happy with my results and it was nice to be able to "back-up" the results with numbers. Rod

[Rodney Zapf]

Welcome Rod,

Others will chime in on the technical question you asked. At least one 65LB and possibly others were purchased by the Army directly out of the civilian production line. They had the Lyc 0-145-B1, B2, or B3 engines. If yours has serial # L-1018 or higher it may be a legitimate Army L-3G. Do you know the early history of your aircraft? If yours is not in that group I apologize for making you salivate. Dudley

The engine number appears to be 1884 and is located on the placard located on the front of the crank case.

[Dan1940Chief]

Here's an O-145 question:

I have one Rocker Box cover stud with a few missing threads. Castle nut can be secured, but not torqued enough and so there is a nuisance oil leak.

So here's the question: Can I manufacture a suitable replacement for this stud by cutting the head off a 10-32 Machine screw?

[Paul Agaliotis]

Dan,
You can modify the hardware to suit your purpose. Generally the hardware is pretty standard, and you might find it at a good supply house. Where it starts to get weird is when the studs start stepping and you need 1/4-20 stepped to 10-32. Some are standard but most are special to each manufacturer.
Paul