Electric “Radial” RC Aircraft Motor
https://hackaday.com/2021/09/19/electric-radial-rc-aircraft-motor/

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/