askJohn

Regarding positive feedback oscillations

by | Friday, September 17, 2021 |
Stop the oiscillation befor it ever begins with a bit of Velcro

Large control surfaces are more flexible than you might believe and this means they can set up a positive feedback oscillation. There's an easy fix and we show you what to do about it!

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On servo gear trains

by | Saturday, October 16, 2021 |
A bit about the ins and outs of servo gear trains

Ever wondered how such a tiny motor can produce such huge amounts of torque? Like the transmission in a Ferrari launching it to to 200mph, with the servo it's down to the gear train.

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About tail rotor servos

by | Friday, September 17, 2021 |

Tail Rotor Servos There are a class of servos, which we call tail rotor servos. Their pulse range is half as wide (the why is beyond the scope of this article so please just accept that they're...

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BEC or dedicated pack?

by | Wednesday, September 1, 2021 |

Kindly review this material before proceeding. The case against synthetic voltage Bypassing the BEC As the manufacturer of ProModeler servos we advise using a 2S LiIon or LiFePO4 dedicated pack or a...

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Idle thoughts regarding chargers

by | Sunday, July 11, 2021 |
Before buying your next charger

Most charger-purchases are tactical decisions; what do I need right now? But a more strategic view may result in your deciding several inexpensive individual chargers deliver better redundancy and flexibility for charging/discharging several packs at a time. This may better suit you!

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Double up, another use for a Y-harness!

by | Saturday, March 20, 2021 |
Reverse your thinking regarding Y-harnesses!

Most only think of the Y-harness for connecting two servos to one channel. Thing is, this handy little accessory is useful the other way around, also.

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Low buck trick to stretch mask use

by | Tuesday, March 16, 2021 |
Waste not, want not, or how a spritz of IPA can save a mask for reuse

In the vein of a penny saved is a penny earned, this brief how-to shows you an easy way for making your mask serviceable for its intended duty after repeated use. Maybe it's a stretch to say it results in a free mask, but it's effectively true!

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On the value of double-filtration

by | Tuesday, March 16, 2021 |
If double masking makes an N95 more comfy and encourages use, it helps saves lives!

Watching some rat bastard politician on TV was the first we noticed someone wearing two filters. One with their party's logo worn over a serious N95 led us to think; 'If it's good enough for them...'

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Are you playin' checkers or chess?

by | Wednesday, December 30, 2020 |
. . . or how not to get screwed on your next servo purchase!

Selecting servos can be confusing and most guys get snookered by expensive advertising campaigns and sponsored pilots who say what they're told to. How can you figure it out for yourself? We show you how!

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How to use an HV-servo with a 6V-radio

by | Thursday, November 5, 2020 |
How-to use an HV-servo with 6V-radio systems

A low-buck approach for how to use a HV servo with a 6V-radio system. Best part? It applies to an X-MAXX, TRX4 or pretty much 'any' vehicle (of any brand) relying on a 6V BEC-circuit to operate the steering servo!

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When's the next super special sale?

by | Monday, October 26, 2020 |
Wanna really get screwed?

Buying into the marketing-driven idea of special pricing, as if costs change based on certain magical days, is a good start! Instead of cat and mouse games, we make you our best offer from the very beginning.

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Servo choice affects your experience

by | Saturday, October 24, 2020 |
Servos affect your fun, choose wisely!

Interested in trying your hand at 3D? Confused by conflicting advice regarding servos? We help guide you through specs like torque, speed, current, and voltage - and why they matter. Plus what's better for you; a BEC or battery - and why!

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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 2S1000 LiPo?

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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Let's gore an RF-ox!

by | Tuesday, December 3, 2019 |

Q. I'm curious what receivers and other electrical components you use, and maybe how you linked them together. In other words, what you find works well with your servos.A. Radio system selection...

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Silk and dope – demystifying modeling's classic finish!

by | Wednesday, August 28, 2019 |
Silk-and-dope the classsic model airplane finish

What's the connection between servo selection, and a brief how-to regarding the classic silk-and-dope model airplane finish? As occasionally happens, we detour through the unexpected coincidences of life before reaching an answer.

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Gasser throttle servo?

by | Monday, July 15, 2019 |

Which throttle servo would you recommend for a gasser? Many criticize using mini-servos in this application, can your mini servos take it? And because it's quite fast, what are your thoughts on using a tail rotor servo?

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Bypassing the BEC

by | Sunday, June 9, 2019 |

Since the BEC included with the ESC is usually limited to 5A of current and modern high performance servos can exceed this, bypassing the BEC and using a 2S LiPo is an easy solution - and inexpensive too.

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Are ProModeler servos programmable?

by | Tuesday, May 21, 2019 |
Programming at the transmitter is easier

A standalone servo programmer is something of a kludge because each servo must be removed from the airframe to access the lead, to disconnect it from the wiring harness and plug into the programmer. Rinse repeat for any adjustment - what a pain!.

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Fear of loss, or how to stack the odds in your favor!

by | Wednesday, April 3, 2019 |
or why otherwise sensible modelers use two batteries!

Marketing types push your buttons by using words like 'safety' to get you to ignore common sense and outfit your model with two battery packs. We explain why this is just BS designed to get rubes off their wallets.

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Servo connectors & extensions

by | Thursday, February 28, 2019 |
Why getting what you pay for can be tricky!

I occasionally field questions regarding servo connectors and extensions (especially for giant scale models). Let's briefly delve into some mechanical and electrical considerations because basically, we (all brands) play by similar rules.

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