magilla
Gyro Project Owner
- Joined
- Dec 17, 2005
- Messages
- 546
- Location
- Little Rock, AR
- Aircraft
- UH-1H / UH-60A
- Total Flight Time
- 2000+ RW
Can anyone help me with the math (Chuck Beatty??)
850 lb all-up GWT gyro.
27' DWs (2 ea 12-foot blades and 3' hub bar)
Modified RFD head (Single bearing head)
What is correct undersling for thius setup?
What type of bearing do I need? Single or double?
Short Story - Called Ernie at RFD and sent him some pics of my Rotor Head, as the anti-flap bushings he sent me did not fit (too short).
He looked at the pics and said that the head was a modified single bearing RFD head, and that the all-up GWT coupled with 27' rotors teetering at the top hole in the teeter towers and teeter block would create too much of a load (can't remember what type), and that the head could suffer catastrophic failure withing 250-300 hours.
Yikes!!!!!! :twitch:
Well, needless to say, he got my attention.
This thread is not meant in any way to challenge Ernie's hypothesis - I fully believe him, but I just need more info before I buy a new RFD double bearing rotor head.
So, can any of you math geniuses help me with the numbers?
recommended undersling?
Double or single bearing load limits?
FYI, the top teeter hole is 8.75 inches up from the ring gear in the pics below.
850 lb all-up GWT gyro.
27' DWs (2 ea 12-foot blades and 3' hub bar)
Modified RFD head (Single bearing head)
What is correct undersling for thius setup?
What type of bearing do I need? Single or double?
Short Story - Called Ernie at RFD and sent him some pics of my Rotor Head, as the anti-flap bushings he sent me did not fit (too short).
He looked at the pics and said that the head was a modified single bearing RFD head, and that the all-up GWT coupled with 27' rotors teetering at the top hole in the teeter towers and teeter block would create too much of a load (can't remember what type), and that the head could suffer catastrophic failure withing 250-300 hours.
Yikes!!!!!! :twitch:
Well, needless to say, he got my attention.
This thread is not meant in any way to challenge Ernie's hypothesis - I fully believe him, but I just need more info before I buy a new RFD double bearing rotor head.
So, can any of you math geniuses help me with the numbers?
recommended undersling?
Double or single bearing load limits?
FYI, the top teeter hole is 8.75 inches up from the ring gear in the pics below.