KenJ
Veteran
Location: Ohio, USA
| Xtreme34,
If you examine the heads that have come apart during drag racing or from any other activity that has high head speed, the failure typically occurs in one of 3 places.
1 - The blade grip fails - typically plastic grips are a no no.
2- The threads pull out of the spindle
3 - The head of the cap screw pops off.
I have done several tensil tests of rotor head assemblies showing where and how they break and also the amount of force it takes to make it happen.
Send me a PM with you e-mail and I can send you some of the results.
The bottom line for safety is -
- use light weight, high quality blades, "V" blades are a good choice.
- Change your spindle shaft and bolts often to reduce the potential of stress changing the characteristics of the material
- Change your blade grips to metal
- Change the blade bolts often
- Run a governor to limit the max head speed.
- Calculate the actual force your blades are pulling, I believe Nate? has a good online formula.
What are you flying?
Ken
Team JR |
