The coilspring powered bows gathered some attention and thus I followed up the idea with a crossbow that also uses coilsprings as its energy source. It works using a different principle though. To get to see and know more, watch the Video, and/or read the article in the DIY Projects. Including drawings.

Mit Federn betriebene Armbrust

The coolest folding Knife - Pantographic "Paratrooper" Knife

After the short "Teaser"-video of the 3D-printed Pantographic Letteropener now here the presentation of the so far final product. Made with a proper blade from spring steel, parts of the mechanism from cnc-machined aluminium, scales on the handle and other smaller parts 3d-printed. In addition a lot of manual work and a total of 3 prototypes, over 8 months total - and the result is I think the most professional and best looking project I have ever made real.


The first video about the spring powered bow went alright so I decided to make an improved version and make a Video of it as well of course. And also a new entry for this thing in the DIY Projects. There I also provide the full plans I build this bow after.

Spring powered Bow, Mark II

Compact Bow

new DIY Projects!

New stuff in the DIY-Projects, like the Map of Europe in Squares - with correct proportions, which was well liked on Reddit. Also a new video to another new project: a bow that is powered by coilsprings.


Five new videos since the last news report here: experiments using my crossbow and aluminium plates, as well as the speed of contracting springs and 3 videos about things I have build, like a Sheet Metal Brake. Also there are two new entries in the DIY Projects: a map showing interesting properties of the shape of countries and 3D printed arrow rest I made for a bow.

5 new Videos!

2 new DIY Projects!

Ideas to improve the Calendar (in German only) | Visiting Vesikko: Tour through a World War 2 Submarine

Two new videos. First I tried doing a explainatory/educational video, explaining Ideas to improve the Calendar (in German only). I think it went pretty well, but it doesn't seem to interest many people :). The second video is from my visit to Helsinki, where the Vesikko is standing, a submarine of the Finnish Navy from World War 2, whose story is tightly connected to Germany.


Two new videos: first a small loveletter to my homeland, Mecklenburg. And second, a small Build-Video for Shelves that I put into my kitchen and that make my life just that little bit more organized and better.

Loveletter to Mecklenburg

Very stable Shelves for my 3D-Printer

Making Furniture stronger! - with homemade Wire Rope Tensioning

A while ago I made some workbenches which I documented in an older video and they work pretty well. However, they are a little bit wobbly along the longer axis. For that reason I wanted to make them stronger and use some wire rope tensioning for that, but not use ready made parts that can be bought for this (Turnbuckles etc.). It worked surprisingly well, the workbenches are now much more stable.


My garage/workshop is now a good place to work already. However, after a couple of hours of working in there my feet start to hurt, which is why I build something to sit on in a fitting design to the workbenches. It might or might not as well be true that I only know this style and couldn't build something else due to my lack of experience :).

Industrial Design: Stool for the Workshop

#14 - A BETTER homemade Crossbow!

After 8 months of building time + 3 months additional work for making bolts and making the video this is the next evolutionary step for the homemade crossbow! Mainly of course I recommend watching the Video to get to know more. But I have also made an article in the DIY-Projects-Section, where I present the evolution of the design among other things.


A while ago I have gotten a garage which I am slowly transforming to a workshop. There I hope to finish a lot more projects a lot quicker than before. Of course I need space to work there, which is why I build 2 workbenches following a similar design to what I used on my small workbench in my living room and of course some improvements as well.

#12 - Two Workbenches for new Workshop

Articles for DIY Projects

Well I have this DIY-Projects-Section on this site. So far most of the links in there were just dead links with thumbnails. I changed that now and added (almost) everywhere some pictures and desciptions. In there are many projects I am still proud of, like a Newton's cradle, a Picture of Nails, or Bows of Metal.


For years I had this bag of 500 Shashlik pins laying around. Now I put those to use to make something nice out of it: a bridge! Of course there is a video as well from the process as well as the destruction.

#11 - Making a Bridge from Shashlik-Pins

#10 - 'GoGun Viper' Repetition-Pistol-Crossbow: Review

I am working all the time on the next model of the home made crossbow, which is why I post fewer updates. However, I used one of the nicer days of the winter to do a small testvideo about the 'GoGun Viper'


I finally got around to do a video about a method to find our projectile speeds, without using expensive gear like an actual chronograph or a highspeed camera. I tried this out first a couple of years ago with a bow, and its works reasonable fine, probably within a margin of error of +- 5% or so.

#9 - Measuring Projectile Speeds - without a Chrony

#8 - 8500 km Solo-Trip um die Ostsee

After endless hours in my Video cutting program here is a summary of scenes of my trip around the Baltic Sea. This time even with music, and I think it even fits quite well.


New photos in the.. Photo-Section. A while ago I finished a roadtrip were I drove around the whole Baltic Sea and visited the North Cape. From this trip quite a bit more content will soon come to the site. First, a small video about an interestin optical effect I saw while being in Copenhagen.

#7 - Dark is always on the Right

#6 - Simple Shelf with little Effort and no Skill

In the video about the lenses I noticed that such documentations of "How-To"-stuff can become a bit...boring very quickly. For that reason I tried to keep this video a bit more exciting and entertaining by using faster, shorter cuts and more timelapses (and just leaving a whole lot out). I get the advice to add music, but to be honest I have a hard time finding something appropiate. Often I get annoyed by wrong music in videos and would rather prefer no music at all.


With every new video I try something new; music this time. Its actually not so easy to find the right one as it has to be good, fitting and come with the right licence (Creative Commons). Unfortunatly still you can never satisfy everyone with a music choice.

Another thing I tried out was to strap a GoPro to a steering wheel, instead of fixing it to the window or other places of a car. It made a cool effect I think. So with this I went on a drive through the neighborhood in this usually good weather for a german winter and made a nice timelapse video.

#5 - Timelapse Drive through Berlin (Spandau / Siemensstadt)

#4 - How to make Optical Lenses

The speed in which I produce new videos is hard to believe! Again something new after only 1 month :). This time it is about a topic that follows me for quite a while now: optical systems and the quest to make lenses in an acceptable quality.

In any case, thats what I also learn from such videos, I should definately make shorter ones - in exchange for higher quantity hopefully.


A new video. This time a small review of a crossbow that I got recently (..after a 6-month delivery time..). The Talon Eagle Pro. Coming up next probably more content with this very crossbow.

Also did some bugfixing on the menu: the error that occured on Internet Explorer wasn't actually an error and more a wrongly written CSS-File by me :)

#3 - First Impressions of the Talon Eagle Pro Crossbow

Improved the layout of the site and made it easier to read and started doing the english subsites. Also started with the page for DIY-Projects. So far its only the thumbnails and dead links. To produce the content for that one takes a while. For some reason the display of the menu in Internet Explorer doesnt quite work right. I dont know yet why that is, but I am open for suggestions :).


After the domain provider of my old personal website '' closed down, I bought this new domain '' and made this new website. Design and layout are much simplified and more sleek now and I added a lot of new content, like the videos from my Youtube-Channel, DIY-Projects and other things that interest me. The traditional subpages with artworks, photos etc. also remain of course and got updated.


#2 EN - Homemade Crossbow out of Spring Steel

My second video for my Youtube Channel. This time it is about a DIY-project that occupied me for a while. This homemade crossbow is the first evolutionary step of a project I will pursue a lot further in the future. Things like an aiming system are still missing entirely. Also the grip and the shoulder rest are only temporary so far. This will get much better in the next steps.


I now have a small Youtube Channel on which I will - unregular so far - add videos about topics that interest me. This will be mainly things like vehicles, DIY stuff and explanatory videos. For the start it is a video with a ride on my motorcycle.

#1 MZ TS 250/1 Sound