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Model Forum / Radio Controlled / Helicopters / April 2008Raptor 90 engine alignment and gear mesh
The manual states to use a piece of paper between the gears to get the proper gear mesh. I used newspaper. Is that OK, or should I use some specific thickness? When the gear mesh is set, I need to get the engine lined up with the starter shaft. How do I do that? I can spin the starter shaft and adjust the engine until the starter shaft spins freely, but I feel there is a fairly large range where the shaft still spins freely, so it does not seem accurate enough. Or is it?  SignatureRoRo > The manual states to use a piece of paper between the gears to get the > proper gear mesh. I used newspaper. Is that OK, or should I use some > specific thickness? A piece of paper is fine. The reason for the paper is just to ensure the teeth on both gears aren't "mashed" together too tightly. If you can feel the SLIGHTEST amount of backlash, tht's good too, but if there's none, the heat generated when the heli is flying is enough to make both gears expand to the point they're trying to rip the sh.t out of each other. That's regarded in the hobby as "Not good". > When the gear mesh is set, I need to get the engine lined up with the > starter shaft. How do I do that? By slackening the bearing holder for the start shaft and "tweaking". > I can spin the starter shaft and adjust the engine until the starter > shaft spins freely, but I feel there is a fairly large range where the > shaft still spins freely, so it does not seem accurate enough. Or is > it? If it turns with no effort and it doesn't try to rock the engine when you turn the start shaft, fly. SignatureBeav VN 750 Zed 1000 OMF# 19 >A piece of paper is fine. The reason for the paper is just to ensure the >teeth on both gears aren't "mashed" together too tightly. OK. >> When the gear mesh is set, I need to get the engine lined up with the >> starter shaft. How do I do that? > >By slackening the bearing holder for the start shaft and "tweaking". I was more thinking of how to see when it is straight. Everything there is quite hidde behind the frame, so I can't see any way to sight across to check for straightness. >> I can spin the starter shaft and adjust the engine until the starter >> shaft spins freely, but I feel there is a fairly large range where the [quoted text clipped - 3 lines] >If it turns with no effort and it doesn't try to rock the engine when you >turn the start shaft, fly. OK. It's now almost frictionless, so I'll have a go. Thanks for your input. SignatureRoRo >>A piece of paper is fine. The reason for the paper is just to ensure the >>teeth on both gears aren't "mashed" together too tightly. [quoted text clipped - 9 lines] > there is quite hidde behind the frame, so I can't see any way to sight > across to check for straightness. You need to look at the bottom of the clutch bell to see if it lines up with the TINY amount of clutch shoe you can see. Also, look at the line of the clutch bell and check that against the line of the main gear. >>> I can spin the starter shaft and adjust the engine until the starter >>> shaft spins freely, but I feel there is a fairly large range where the [quoted text clipped - 5 lines] > > OK. It's now almost frictionless, so I'll have a go. Yeah, don't get fired up over a problem until it's obviously a REAL problem. > Thanks for your input. No probs. SignatureBeav VN 750 Zed 1000 OMF# 19 |
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