Over the past few days, I mounted the HS and was thus able to align the tailcone fairing. Drilled the holes in the fairing and the tailcone for the nutplates.
I had to remove about 1/8" of material from the HS skin at the aft end of the tailcone fairing. The plans want 1/8" between the HS skin and the tailcone fairing.
Fabricated the trim motor bracket and installed the trim motor and checked its operation. I have a problem setting the speed of the trim motor to the specification in the plans. More on this below. Also had to do a bit more sanding on the slot in the fairing as the trim rod was closer than 1/8" to the fairing.
Removed the HS and drilled the rivet attach holes for the nutplates and riveted them to the tailcone. 3 full days, about 22 hours to complete the tailcone fairing work.
Also, attached the lower cowl and checked the exhaust pipe fit. I had to open up the hole as the pipe was not centered. Then marked and cut the exhaust pipe to 4".
Trim Motor Issue as Posted on VAF. Hope to find a solution, soon!!
"Problem-Setting Trim/Servo Motor Speed"
The fastest trim speed I can obtain at a battery voltage of 12.3 VDC (as measured with a DVM at the battery) is 40 seconds (stop to stop). This is with the potentiometer at its stop. The trim motor merely buzzes with the pot fully in the other direction. The plans call for a min speed of 30 seconds at 12.0 VDC. The trim motor sounds as though it is laboring (wha-wha sound).
ANYONE else having this problem?? Has anyone solved the problem??
I measured the resistance of white wire and the white/red wire (power to the motor) from the tail to the 37 pin connector behind the panel and each is 0.9 ohms. So the wires and all crimps are good.
I have attached a battery charger and with a battery voltage of 13.8 VDC (at the battery), the trim speed is 31 seconds.
I have measured the DC voltage at the running servo with a DVM. The voltage is 5.0 VDC. From another post, I understand that the control panel board produces a pulse width modulation signal. A lower voltage is to be expected as the DVM is measuring an average of the chopped signal. I do not have a scope to view the waveform.
With the trim motor attached to a DC power supply, the trim motor speed is 12.0 seconds at 12.0 VDC and 10.0 seconds at 13.8 VDC.
I have talked to support at Van's and they have acknowledged others are having the same issue, but, could not suggest any other testing other than replacing the switch panel.
Has anyone replaced the switch panel and obtained better results??
Do the servos vary? Has anyone replaced the servo and obtained better results?
Time Over the Past Few Days - 24 hours
