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Old Sep 10, 2012, 04:11 PM
Crash and learn
United States, PA
Joined Dec 2011
1,605 Posts
V911 Notes

First Flights
Diode Voltage Drop - To lower voltage of a supply source

Changing to new version swashplates and carbon main shafts should have added some screws. On the ones with Delrin main gears, you can grab extra screws from the ring collars as the thicker Delrin main gears should allow the main shaft to drop without disengaging the pinion.

Then you have gobs of extra screw that can be robbed from the dual-charger and transmitter.

Reminds me, when putting screws back into plastic, turn the screw backwards (out) until you hear a click as the screw finds the original threads, then turn the screw in. Avoids stripping the plastic threads.

First Flights
If you have problems getting into the air, try getting the helicopter quickly to eye level to get out of the ground effect, or hand launch if all else fails. You may find a slow lift-off causes the helicopter to scoot left, so be prepared for it. A slow lift-off can be done smoothly after you learn to control the helicopter.

A good launch pad is a (soft) cardboard box about 2 feet high. Then fly forward off the edge into clean air. The helicopter will drop but you already are adding throttle so just keep adding more.

Diode Voltage Drop - To lower voltage of a supply source
A string of forward biased diodes in series.. Each diode drops the voltage by 0.6 volts. Ten diodes will drop 6.0 volts. The diodes have to be rated for the current they will have to carry. Test to see if you get the voltage you want, then put the string in heat shrink tubing.

Diodes must be able to handle the maximum current. Current can be less than the diodes maximum continuous current rating

Diodes (1 amp rating) can handle 1 amp or less. They will be OK with 1 amp, 500ma, 300ma, 100ma etc.

But you have to hook up and test before making permanent. Note that at 1 amp the power dissipation will be 0.6 watts per diode. For 10 diodes (6v drop) power dissipation will be 6.0 watts at 1 amp. Power will be less if current is less.

This is a very simple way to drop small amounts of voltage.
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Last edited by Ribble; Sep 15, 2012 at 02:05 AM.
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