For a long time radial aircraft engines, with their distinctive cylinder housings arranged in a circle, were a common sight on aircraft. As an experiment, [KendinYap], wanted to see if …read more (https://hackaday.com/2021/09/19/electric-radial-rc-aircraft-motor/)

Optical Theremin Makes Eerie Audio with Few Parts
https://hackaday.com/2021/09/19/optical-theremin-makes-eerie-audio-with-few-parts/

[Fearless Night]’s optical theremin project takes advantage of the kind of highly-integrated parts that are available to the modern hacker and hobbyist in all the right ways. The result is …read more (https://hackaday.com/2021/09/19/optical-theremin-makes-eerie-audio-with-few-parts/)

Lego Submarine Gets Balloon Ballast System
https://hackaday.com/2021/09/19/lego-submarine-gets-balloon-ballast-system/

Lego is a fun building block which vast numbers of the world’s children play with every day. However, the mechanical Technic line of Lego building blocks has long offered greater …read more (https://hackaday.com/2021/09/19/lego-submarine-gets-balloon-ballast-system/)

Recharged Dehumidifier Put Back Into Service
https://hackaday.com/2021/09/19/recharged-dehumidifier-put-back-into-service/

For the average consumer, repairing relatively low-cost home devices such as microwaves and TVs just isn’t economically viable. You can hardly blame them when the repair bill could easily be …read more (https://hackaday.com/2021/09/19/recharged-dehumidifier-put-back-into-service/)

PCB Metro Maps Are a Gorgeous Labor Of Love
https://hackaday.com/2021/09/19/pcb-metro-maps-are-a-gorgeous-labor-of-love/

Is your love of public transportation matched only by your passion for designing custom PCBs? If so, then you’re going to love these phenomenal transit maps created by [Chai Jia …read more (https://hackaday.com/2021/09/19/pcb-metro-maps-are-a-gorgeous-labor-of-love/)

Hackaday Links: September 19, 2021
https://hackaday.com/2021/09/19/hackaday-links-september-19-2021/

Things might be getting a bit dicey out in Jezero crater for Ingenuity. The little helicopter that could is starting to have trouble dealing with the thinning Martian atmosphere, and …read more (https://hackaday.com/2021/09/19/hackaday-links-september-19-2021/)

Tracking Maximum Power Point for Solar Efficiency
https://hackaday.com/2021/09/19/tracking-maximum-power-point-for-solar-efficiency/

In days of yore when solar panels weren’t dirt cheap, many people (and even large energy companies) used solar trackers to ensure their panels were always physically pointed at the …read more (https://hackaday.com/2021/09/19/tracking-maximum-power-point-for-solar-efficiency/)