automan1223
Active Member
- Joined
- Nov 3, 2003
- Messages
- 3,760
- Location
- Oriental, North Carolina
- Aircraft
- 2p Tandem Air Command "Big Red"
- Total Flight Time
- 250
I made a set of blade straps to reduce the rotor disc from 30' down to 28'. The skywheels blades are very heavy,
the new hub bar is a fixed pitch type like found in the rotordyne setups.
The aluminum hub bar is 1.250 thick milled down to 1" thk to accomodate coning angle, and has (3) 1/2 bolts securing the 2-2" wide x .250thk steel strap material. There are (4) - 3/8" bolts securing the blade to the straps in their original locations.
The steel material is your typical hot rolled spec but I feel that since I have pitch and track worked out
I will use grade 4130 bar ? to replace the hot rolled bar.
Is this material good enough for continued use ?
Is the old hot rolled stuff ?
how many lbs in tension is the straps with a 13.5' blade section turning 350rpm ?
Hence my earlier question about centrifugal forces acting on the blades. I know dragon wings have only 2 bolts securing straps to hub bar which is much lighter material, but the blades are also quite a bit lighter too.
Suggestions MR Beaty ?
Jonathan
Oriental NC
the new hub bar is a fixed pitch type like found in the rotordyne setups.
The aluminum hub bar is 1.250 thick milled down to 1" thk to accomodate coning angle, and has (3) 1/2 bolts securing the 2-2" wide x .250thk steel strap material. There are (4) - 3/8" bolts securing the blade to the straps in their original locations.
The steel material is your typical hot rolled spec but I feel that since I have pitch and track worked out
I will use grade 4130 bar ? to replace the hot rolled bar.
Is this material good enough for continued use ?
Is the old hot rolled stuff ?
how many lbs in tension is the straps with a 13.5' blade section turning 350rpm ?
Hence my earlier question about centrifugal forces acting on the blades. I know dragon wings have only 2 bolts securing straps to hub bar which is much lighter material, but the blades are also quite a bit lighter too.
Suggestions MR Beaty ?
Jonathan
Oriental NC