Today's Message Index:
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1. 07:12 PM - Flap Motor repair attempt report (Vincent Himsl)
2. 09:49 PM - Dynon, tachs, transducers, pulses and more oh my (Vincent Himsl)
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Subject: | Flap Motor repair attempt report |
Hello=2C
I attempted to repair my flap motor and this is my report.
Problem:
Wires broken frayed at entry to flap motor housing.
Solution:
Not touching the worm gear i marked case and dissassembled the motor. The o
nly items removed from the airplane were the end=2C brush assembly and outs
ide case (stator?) of motor.
Discovered that the wires entered the black plastic brush assembly.
My assembly snapped together and wasn't glued thus I was able to separate t
wo halves with a Jeweler's screwdriver.
Soldered new wires to stubs inside housing. Cavities inside housing allowed
me to reroute the wire without the solder joint causing an interference pr
oblem.
I cleaned the rotor and brushes. Rotor was clean and didn't have much oil o
n it. The brushes however had a kind of varnish coating. Burnishing the bru
shes fixed that. I didn't do the grease removal that is mentioned a lot on
the list. Why?
I took the rotor in my hands and manually rotated it to determine the load
the motor felt raising and lowering the flaps. The feedback force is essent
ially zero even with my leaning on the flaps to restrict their movement. I
saw no evidence of grease working its way up the rotor.
I reassembled the motor and tested. Works great and I didn't spend $300 plu
s bucks for a replacement.
Will let you know if motor goes south in future. But for now=2C I need to w
ork on my 40 hours so as to make my RV-8 a respectable airplane.
Vince H.
RV8 N8432 20 hrs.
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Subject: | Dynon, tachs, transducers, pulses and more oh my |
Hello=2C
After exhaustive searches=2C I broke down and read my Lycoming manual. I kn
ow=2C like asking for directions and admitting you're lost.
I have a Van's tachometer transducer connected to a Dynon D-180. Now the tr
ansducer puts out 8 pulses per revolution but I=2C like most=2C had to set
it at 3.5 or 4. Why?
Well... the Lycoming manual clearly (when actually read) states that the ta
ch transducer output gear turns at a .5/1 ratio. In other words when the en
gine rotates once=2C the tach transducer output rotates 1/2 turn. If you se
t your Dynon tachometer input to 8 pulses/rev=2C you will get half the RPM.
Doing the math:(.5 Trev/Erev) x (8 pulses/Trev) = 4 pulses / Erev which i
s where most of us have been setting the Dynon using trial and a lot of err
or.
Trev= tach port rev
Erev= engine rev
pulses= transducer pulses.
Hence the 4 (some 3.5) pulses per engine revolution. Again only a compariso
n with a calibrated tach (tru-tach) will let you know for sure how close yo
u are.
Now if I am wrong=2C don't tell me for it appears to be working.
Vince H.
RV8 N8432 20 hours and 'climbing'
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