Julien ARNAUD ⁽¹⁸⁾

A friend had accuracy problems on his SR22, due to the slide having too much play. I was inspired by HK's use of an o-ring on their USP and machined a piece of 4140 into some kind of a muzzle break that also doubles as a slide centering device, using a small o-ring for perfect centering.

I was inspired by The SilencerCo Maxim 9 (Not imported in France) to design my own suppressor following a similar philosophy : maximizing the suppressor volume with a very specific design.  Disclaimer : Suppressors are perfectly legal and non-regulated items in France. If you use any part of this post to produce a suppressor in the USA - or any country where this is illegal, you are sole responsible for any legal consequences. Drawing was done using Sketchup (a fairly old version). As I don't have access to a metal additive…

I quite like my MX-30 but the rims and the ride height always seemed off. Using H&R springs (-35mm front, -40mm rear) and Borbet "V" rims, the result is most satisfying. I carefully researched tires, as I was forced to go from 215 to 225 width and didn't want to sacrifice too much range to that. It is after all, a tiny 32kWh battery ! Turns out Goodyear Eagle F1 Asymmetric 5 in 225/45/19 have better rolling resistance (A) than stock Bridgetone T005A tires in 215/55/18 (B) without sacrificing on…

I designed a soundsystem for my Renault Twizy around the following elements Subwoofer The subwoofer enclosure was designed to fit in the narrow space behind the passenger seat. This gave the subwoofer a kind of rounded/organic shape. From this shape I got an internal air volume. I looked for speakers that would work in such a small volume and still produce the desired level of bass (I aimed for around 45Hz -3dB). The software popped out a 6.5" Audax with dual coils. The simulation has some compromises though, at full…

I replicated the results of Connor Bolton, Sara Rampazzi, Chaohao Li, Andrew Kwong, Wenyuan Xu and Kevin Fu. in "Blue Note: How intentional acoutic interference Damages availability and integrity in hard disk drives and operating systems". I set up one of my DIY Cabasse Spheres in front of a Fujitsu MJA2160BH. Doing a frequency sweep from 850Hz to 1.1Khz at around 102 to 105dB. When reaching close to 975Hz +/- 25Hz, the bitrate of the read file drops from 70MiB/s to a few KiB/s. Data was generated from /dev/random, secondary…