Funtana dead
12-19-2004, 06:23 PM
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Funtana dead
Stripped the elevator servo during a spin. I'm mad at the Hitec karbonites, they were more than enough for this plane. Rest in peace Funtana.
12-19-2004, 07:18 PM
#4
RE: Funtana dead
Use a spring on the tail wheel and that would not have happened. I stripped a standard servo on the same arf. I think it was from hard landing(s).
ORIGINAL: Vic3D
Stripped the elevator servo during a knife edge spin. Hitec karbonites jsut weren't enough. Rest in peace Funtana.
Stripped the elevator servo during a knife edge spin. Hitec karbonites jsut weren't enough. Rest in peace Funtana.
12-19-2004, 07:26 PM
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RE: Funtana dead
how would a spring on the tail wheel have helped an elevator servo not strip? nmtr13 appreciate it but it would make it heavier so no thanks.
12-20-2004, 04:21 PM
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RE: Funtana dead
There are no absolutes, even a high torque servo can be stripped with the wrong linkage. Can you post a picture of the elevator servo linkage. For example if you used a long servo arm with the control rod towards the end and then hooked the control rod to the inner hole on the elevator for maximum throws, you could have created a situation where the mechanical advantage worked to exceed the strength of the servo even though it was rated for sufficient torque.
Using your servo as an example:
90 oz-in from the servo into a control rod 1.5 inches from servo center sends 60 oz of force to elevator. If you used an inner hole on the elevator control horn 1/2" out from the hinge then 60 oz on the rod only delivers 30 oz-in of torque to the elevator.
Or to work it backwards using the same scenario as above, if the plane calls for 50 oz-in servos minimum, then 50 oz-in on the 1/2" hole on the control horn requires 100 oz on the control rod to hold. To develop 100 oz on the control rod on a 1.5" servo arm hole require a servo capable of 150 oz-in.
Duke
Using your servo as an example:
90 oz-in from the servo into a control rod 1.5 inches from servo center sends 60 oz of force to elevator. If you used an inner hole on the elevator control horn 1/2" out from the hinge then 60 oz on the rod only delivers 30 oz-in of torque to the elevator.
Or to work it backwards using the same scenario as above, if the plane calls for 50 oz-in servos minimum, then 50 oz-in on the 1/2" hole on the control horn requires 100 oz on the control rod to hold. To develop 100 oz on the control rod on a 1.5" servo arm hole require a servo capable of 150 oz-in.
Duke
12-21-2004, 01:27 PM
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RE: Funtana dead
ORIGINAL: afterburner
Hey Vic,
At least you didn't crash your 1/3 scale into the trailer.
Hey Vic,
At least you didn't crash your 1/3 scale into the trailer.
