Lycoming O-540 260 HP engine (28 of 154)


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I called Zenair today and found out that the 2.5 degree offset of the engine needs to be set with the nose of the engine on the center line of the firewall. We need to figure out how much to move the rear of the engine to make a 2.5 degree offset. So, if we all refer back to our calculus all we need to know is the distance from the nose of the engine to the firewall and then we take the tangent of 2.5 wich is .0437 and multiply that by the distance from the nose of the engine to the firewall which is 57 inches and that will give us the distance to move the rear of the engine if it was actually at the firewall which is 2.49 inches. Now that we have that information all we have to do is bolt the dynafocal mount to the engine, lift the engine into position, and then move the rear of the engine so that if you drew a line through the center of the engine that line would be 2.49 inches off the center line toward the pilot. Then you need to move the nose of the engine up or down to line up the center line of the engine to be parallel with the top longerons. Now, raise the engine as high as you can on the firewall but be sure to leave room to clear your cowling. TADA... your engine is now exactly where you want it to be. Now wasn't that simple?
I called Zenair today and found out that the 2.5 degree offset of the engine needs to be set with the nose of the engine on the center line of the firewall. We need to figure out how much to move the rear of the engine to make a 2.5 degree offset. So, if we all refer back to our calculus all we need to know is the distance from the nose of the engine to the firewall and then we take the tangent of 2.5 wich is .0437 and multiply that by the distance from the nose of the engine to the firewall which is 57 inches and that will give us the distance to move the rear of the engine if it was actually at the firewall which is 2.49 inches. Now that we have that information all we have to do is bolt the dynafocal mount to the engine, lift the engine into position, and then move the rear of the engine so that if you drew a line through the center of the engine that line would be 2.49 inches off the center line toward the pilot. Then you need to move the nose of the engine up or down to line up the center line of the engine to be parallel with the top longerons. Now, raise the engine as high as you can on the firewall but be sure to leave room to clear your cowling. TADA... your engine is now exactly where you want it to be. Now wasn't that simple?


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