Le Fish open source Ultrabatics

Ultrabatics, what a beautiful word, what inspiring flying.

Le Fish open source Wiki-link for a free EPP design.

The powers of simulation

Today I experienced the powers of simulation, very directly.

I have built a Cularis electric glider  (link) and to prepare myself for the first flight I also bought the Aerofly 5 RC flight simulator. (link). The complete equipment I bought on the internet, RC addict.

The Areofly simulator has a Cularis model and allows you to practice with your own remote control.
Enjoyed the build as much as the simulations, seems like a nice new hobby.

Today I had my first flight, it went without a hitch, even though conditions were not the easiest (Beaufort 3/4 and some turbulence, thanks to the mediocre location).
Did my first looping, steep curves, low passes and my first hand catch.
No problems with turbulence correction, or flying towards me.

Without a single problem, I could fly the Cularis!

sorry no video of photographic proof as I was alone, with a big smile on my face :-)

New monotracer designs

Found some more monotracer, motorcycle designs, for your (and mine) inspiration
More and more designers seem to see the benefit of the monotracer design.

streamlined electric motorcycle mark V.2

Reverted to an earlier design as I felt drifting away from my design objectives: small and efficient.
Uploaded a new youtube movie of the renderings.

America's cup gyro control revealed

 COPY of cupexperience.com

Super clear explanation of the control system, thanks!

remains of the question what this all really means and what are the limits, just generating power by humans, which is then used by machinery/eklectronics to controll the beast (and next, to drive it?) Interesting question is when sailing stops and becomes motorsports ....

AC72 foil control secrets

Some people have questioned whether Oracle Team USA had a secret (and illegal) foil control system in their AC72 that helped them defend the America's Cup.
OTUSA has released drawings and photos of their system, which used a simple "mechanical feedback" loop to allow precise control of the daggerboard rake. Helmsman Jimmy Spithill had buttons on the wheel to rake the daggerboard fore and aft in precise increments of 0.5° giving him better control over lift for hydrofoiling.

OTUSA designers Dimitri Despierres (mechanical systems) and Eduardo Aldaz Carroll (electronic systems) began work in late June 2013 to help the team gybe better. The goal was to reduce distance lost in a gybe from 150 meters to 30 meters. To do this the engineers needed to deal with the problem that board movement varied depending on hydraulic pressure, making it impossible to control lift. What they needed was a way to move the board a fixed amount independent of the pressure and drag load on the board. Within a month, mechanical engineer Alex Davis developed a test bench with a servo control, hydraulic valve and hydraulic ram to simulate movement of the daggerboard box (see photo below).

Once the test bed system worked, the system was tested on board. Accuracy was fine, but it reacted too slowly. Mechanical engineer Neil Wilkinson and hydraulics specialist Rolf Engelberts improved the system to improve response speed and make everything more reliable and robust.

AC72 daggerboard controls on OTUSA Boat 1

The hydraulic ram for rake is not visible in the photo below, but you can see the rams for board cant, as well as the daggerboard cage and daggerboard box. The box moves within the cage, which is fixed in the hull.  Rendering of AC72 daggerboard cage below. The cage is fixed in the hull. The daggerboard box moves fore / aft (rake) within the daggerboard cage. The daggerboard cage moves inboard / outboard (cant) within the hull. Controversy and protest by Team New ZealandOTUSA wanted to make sure their system complied with the AC72 Class Rule. They filed a "Public Inquiry" to the Measurement Committee and got approval on 8 August 2013 - only a month before the America's Cup Match was to begin. Team New Zealand then tried to have OTUSA's system ruled illegal but the Measurement Committee stood by their initial decision and the International Jury ruled that New Zealand's protest was made too late, but would not have succeeded even if it had been filed on time. The marked up schematic below was part of Team New Zealand's submission. OTUSA eliminated the spring labeled "Component X" making the TNZ protest moot.  

Windturbine sailing

Sailing straight into the wind is possible with  windturbine/windmill propulsion.
The turbine is mostly directly mechanically coupled to the propellor.
Her are some examples to get you inspired?

Nuvinci continous bicycle transmission

Fallbrook technologies have invented a very interesting continuos variable bicycle drive.

As far as I am concerned there are two very clever bits:
- using canting ball to transmit power and change drive ratio.
- using a compressable liquid  to assist in this powertransmission.

Have a look at the pictures and their website.