VoltMagic is one cool tool.
I usually fly the machine very hard the entire flight, and I was on the hairy edge and didnít even know it. I was using a 1700 NiCad 4 cell pack to keep the weight down and charging after every flight, which is the only thing that saved me. It wasnít running out of milliamps, but was pulling too many amps and dropping the voltage dangerously low. VoltMagic was blinking red for PLV (peak low voltage).
VIDEO: "Bill Pierce at the Park" flying the "Sky Tractor".
I am now running the VoltMagic on all my models. It has ranges for 4 or 5 cell nicads/nimh or regulated systems including lipos. It gives you the current loaded voltage as an in flight readable LED display and also shows the peak low voltage that occurred during the
flight. If you are running ppm, it records the number of glitches you get or if running PCM it records failsafes. It weighs only 7 grams and is pretty easy to set up.
My fascination is electric. R/C planes since 1989, and helis since 2007. I love teaching others and sharing information, and enjoy every technical aspect of helis both on the workbench and in the air. I usually tackle technical problems with tenacity until a solution is found.
VoltMagic saved my TREX 700 from crashing over the weekend. One of my 2 cell 2500 mAh LiPo receiver batteries slowly died even though it was less than one year old. A worn out LiPo can be an expensive crash, so VoltMagic is a low cost insurance. Rob Clark.
The instructions that come with this unit have a lot of information in them. To get the most out of your Voltmagic, you really need to read the instructions. Read them until you understand them. Once you do, you will see how valuable this little device can be.
More Pilot Feedback
VoltMagic detects problem early
Eight gallons through the gasser and never a glitch. This weekend at Brooks, after the third flight, the first LED blinked once indicating a glitch. I didn't actually notice it while flying, so I looked the machine over and wrenched a few bolts. I flew again and VoltMagic showed a couple more glitches. After a more thorough inspection, I found the cause was that the muffler had started to loosen.
The Voltmagic is an excellent tool for my setup. I recommend it to anyone with a generator.
VoltMagic finds bad receiver switch
While at a Fun-Fly, a factory rep proposed we attach a VoltMagic to see if there was a problem with his latest aircraft. He suspected something was wrong. The symptoms were subtle and intermittent, but seemed to be getting worse. With VoltMagic connected, the sticks were stirred quickly to simulate flying loads while on the bench.
Quick reversal of a servo's direction causes current spikes that approximate actual flying. Try it on your own aircraft when the battery is nearing its last flight of the day and compare the Peak Low Voltage (PLV) to what you had while flying.
After quickly oscillating the transmitter sticks for a few seconds, the PLV was in the red. The battery had already been thoroughly checked with a loaded volt meter (ESV), so he tried plugging the battery directly into the receiver, effectively bypassing the switch. The PLV was normal. Replacing the switch fixed the problem, and the troubleshooting happened risk free without even starting the engine!
Beta Testing Success Stories
Battery trouble found early with VoltMagic
One of our beta testers had installed a new compliment of digital and coreless servos plus a new battery with almost 3000 mah capacity which had been cycled, checked for capacity, and checked with a loaded volt meter (ESV). It had only two flights before installing VoltMagic.
Fortunately, each of these prior flights was with the battery fully charged because this battery had too much voltage drop for the current load of these servos. After one short flight the PLV was already under 4.0 volts. It turned out the battery was a slow discharge type with too much impedance.
Glitch detection on VoltMagic
One of the helicopters in our beta test program started to indicate one or two PCM failsafes per flight. The failsafes must have been only a fraction of a second because none of the pilots noticed anything abnormal during flight - only VoltMagic knew what had happened. Inspection revealed an aluminum clutch drive rubbing on carbon fiber plus a loose bearing in the assembly.
VoltMagic detected the problem before any other symptoms were evident.
VoltMagic - Don't take off without it!