Friction powered Longboard

This is a redesign of the Rotor Flettner project. The effect works after testing it mounted on a windsurf board but it has a potential flaw: Magnus effect has a smaller force than the wind pulling you to the side. The result is that you go more in the wind direction than in the direction that you really want to go. The equivalent to having a very small sail.

But anyways it was a lot of fun to make it and having already the engine and the structure to mount it I thought, why not to try doing something with it :)

And it works, went about 2 kilometers back and forth after discovering I made some design errors and that friction is not my friend. Engineering lessons learnt:
1.- Control cables of the engine should not be touching the floor
2.- Engine should transmit power using some similar material as the wheel
3.- Friction generates heat and 50% of the battery or more is wasted (maybe good for the winter)

Skate and position detail

Wheel coupling with engine

Anderson.Paak dances with us in Berlin

Great concert in Lido with Herr Paak.

Only bad detail: The sound in LIDO. I know that in small shows is almost impossible to have a great acoustic. But I heard Robert Glasper in Festsaal Kreuzberg 2 years ago, and it was just awesome sound. Leaving out the differences, since Festsaal was 90% wood, and thus a great acoustic natural place this time the sound people at Lido did a poor job. Or just the sound system is not prepared for a show like this. Could hear his voice almost always in the background, without a different output channel and always mixed with the bass and the percussion.

Anyways a great performer with a cool band, great DJ and a highly recommendable show. Proud to be dancing with you Brandon!

Learning DOCKER #1

Docker ship with containers

Docker is an exciting technology since April 2013 when it started as open source project. But is only since last year or so that I started hearing more and more about it. And it’s mostly because some companies like Zalando (Berlin) , Spotify and Netflix started implementing it successfully in their servers.

The Docker Mantra is the following :

Build, Ship, Run

Any App, anywhere!


I’ve started trying in my Ubuntu 14 machine with this tutorial:

And what I will try to accomplish in the next entries after playing around with it, is to instance some basic WebServer dingie with some simple API, or just Apache+PHP 7+Symfony. Keep tuned!

Some interesting links: Supercharge your environment using Docker (Presentation)

Evolution of the Rotor project

The first prototye of the Flettner Rotor project is constructed with a modified Aluminium Byke structure (Not yet here since needs to be soldiered)

Materials list:

  • Engine Absima with speed control + Battery + Charger
    Forward, Brake and Reverse modus Engine_AbsimaRotor-AkkuAkku_lader
  • Engine Pulley *Riemenscheiberiemenscheiben
  • Industrial bearings *Flanschlager flanschlager5

This is the first sketch and 1:2 drawing


The first material used to build the cilinder, that at the end is not at all a cilinder but a romboid structure.


Many thanks so far to :
Carlos Fasani, Electronic speed control for the engine
Ing. Mader, Structure advice
Ing. Wawrzyniak, Professional Aluminium welding

Tippgeschwindigkeit Composer (Making it faster)

Nach letzes composer update, ich kriege immer diese Meldung nach update /install : “You are running composer with xdebug enabled. This has a major impact on performance and will break your balls”
So ich habe die richtige Lösung gefunden und wurde mit euch teilen:
$ php -i | xdebug

Guck mal welche config ist schuldig, in meine Ubuntu ist:

Und einfach comment:

Voila! Deine composer is viel schneller ab jetzt. Für mich ist ungefähr 3x schneller.

New project: Portable Flettner-Rotor (Longboard)

3D model available on

The idea come while reading “Symmetry of Sailing” by Ross Garret. The german engineer Anton Flettner was the first to use this physical principle as propulsion engine for a ship in 1922.

The still difficult part and open points to discuss that I have in this Winter project are:

  • Material to use in the main structure. The goal is that is light, when possible less than 10 Kilos,  but resistant since it needs to provide lift.
  • Motor weight: 170 g  Speed controller: 230 g  . Cables + Battery: Aprox.  2 K. Making a total of 2.5 Kilos weight.
  • Still open to discuss: At what speed needs the cilinder to roll and what would be the ideal diameter to provide enough momentum to move 70 Kg in a Longboard (I thought about 40 cm diameter).
    The chain relation between the motor and the cilinder to have the right speed and force. Ex: 10 spin motor: 1 spin cilinder
  • And to end the question: What kind of lift will this generate on a 10 Knots wind, coming from the optimal point, let’s say 90 degrees left or right from the cilinder.

The evolution of a sponsored Tweet

Mini-post with a tweet advertising test made 5 Nov. 2015 at 13:45.

Budget: 9,20 € ( 10 dollars is the minimun budget )

At the end of the day what it delivered is this:

696 organisch / 11.177 gesponsert
Interaktionen insgesamt
79 organisch


Medieninteraktionen 416
Detailerweiterungen 145
Profilklicks 60
„Gefällt mir“-Angaben 8
Retweets 7
Link-Klicks 7
Hashtag-Klicks 2
Folgt 1

I think that it can be a great way to make branding campaigns and to get visibility for a new product or startup.

#Remarketing hack explained. How to use the social banners on your own benefit

I’m sure this happened to you too. After searching for something on the internet, banners showing exactly this product are following you on any other website you visit. And specially on Facebook!

Because you surf the web with Facebook open don’t you ?  Then you must be aware that on 90% of any website there is some kind of facebook plugin. That means facebook knows almost all the sites you visit.

Now why don’t to use this power for our own benefit ?

Follow this simple steps:

  1. Put an article for sale on eBay
  2. Visit amazon and search for the product you are selling
  3. Wait until amazon banners follow you in all social networks
  4. And make a comment in their advertising pointing to your own eBay cheaper sale
  5. Get amazon paid traffic for free in your own benefit


Desarrollo, Investigación y nuevas Tecnologías. Buenos Aires. Berlin.