Photos tips for cell-phone cameras

by | Monday, February 19, 2024 |
Take better photos with a phone's camera!

Cell-phones take pictures rivaling a DSLR of just a few years ago. This brief how-to shares an insider's approach to taking product photos suitable for professional use.

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How to guide a rocket using servos

by | Friday, January 5, 2024 |
Launching a guided servo-controlled rocket to more than Mach 1

Servos may be used to guide rockets, and this is a fascinating insider’s look at one equipped with ProModeler servos going faster than Mach 1 and seeing 14Gs at launch!

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ProModeler vs JR DS8711

by | Sunday, November 5, 2023 |
when you want the best servo to replace a JR DS8711, ProModeler has several!

The venerable JR DS8711, released back in 2006, isn't just long in tooth, but superseded by several ProModeler servos. We help you pick the one best for you!

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About RC servo motors

by | Saturday, September 12, 2020 |

Ever wondered about the difference between DC, coreless, and brushless servo-motors? This askJOHN article addresses it in a largely brand neutral way. and is generically useful because all servos - regardless of brand - use one of these three types of motors (share the link freely).

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How to determine flight time for a 2S850 LiIon

by | Wednesday, December 18, 2019 |

Is your avionics battery pack safe for three-flights? How about five? How can you figure out if it's safe to fly a sixth time before recharging the battery pack powering the radio system? The answer determines if you drive home happy at the end of the day, or not!

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