Phil_Ruffin
Gold Member
Posted by Gyro (Paul)
I recently purchased a set of 23' McCutchen Skywheels rotor blades. they appeare to be in good shape but I think they are an earlier model....most likley when they were first produced. I have a later model hub that I was going to stick them in and the bolt patten does not line up. the hole closest to the center does but the 2,3,4 holes are out. The hub that it came with is fine but it weighs nearly 3lbs more and is a little thinker.
I had a set of 23's and messed one up and got another set of 25' to replace them. I had the same problem you are having. Here's how we (Scott E. and myself) fixed it.
Put the blades in the hub and put in any bolts that will fit.
String the blades as best you can get them.
Take a centering bit and drill new holes in the hub to match the holes in the rotor.
Take a doughnut type bushing and recess it flush into the new hub holes with epoxy.
Bolt the blades together and hang them by the Jesus Bolt
Use a water level and add weight to the higher blade until it matches the other blade. (this can take some time to get right because of the bobbing of the blades and there can be no breezes in the shop)
You may need to adjust the tracking once back on your gyro
Hope that made sense.....
These blades flew just fine, here is a photo of my old hub bar.
I recently purchased a set of 23' McCutchen Skywheels rotor blades. they appeare to be in good shape but I think they are an earlier model....most likley when they were first produced. I have a later model hub that I was going to stick them in and the bolt patten does not line up. the hole closest to the center does but the 2,3,4 holes are out. The hub that it came with is fine but it weighs nearly 3lbs more and is a little thinker.
I had a set of 23's and messed one up and got another set of 25' to replace them. I had the same problem you are having. Here's how we (Scott E. and myself) fixed it.
Put the blades in the hub and put in any bolts that will fit.
String the blades as best you can get them.
Take a centering bit and drill new holes in the hub to match the holes in the rotor.
Take a doughnut type bushing and recess it flush into the new hub holes with epoxy.
Bolt the blades together and hang them by the Jesus Bolt
Use a water level and add weight to the higher blade until it matches the other blade. (this can take some time to get right because of the bobbing of the blades and there can be no breezes in the shop)
You may need to adjust the tracking once back on your gyro
Hope that made sense.....
These blades flew just fine, here is a photo of my old hub bar.
Attachments
Last edited: