system is attached at 2 points of the bicycle-frame to steer the axle in sync with the steering of the bicycle.

* brief technical description * The stabiliser consists of a steel-tube chassis that is attached to both sides of the rear-wheel spindle.. This chassis is attached to the centre of a narrow, solid-steel axle (50 cm wide) placed just behind the rear-wheel. The axle rolls on 2 pairs of small bicycle-wheels (e.g. 14").

Each of the 2 wheel-pairs can be pulled or pushed via a solid-metal attachment, independent of the axle's forward movement.

A freewheel is fitted around the steerer-tube of the front-fork of the bicycle. A cylidrical torque-transfer component is attached to the seat-tube of the bicycle. This torque-transfer cylinder has a free-wheel fitted around its top end. A bicycle-chain connects the steerer-tube's free-wheel to the torque-transfer cylinder's top free-wheel. The torque generated by the turning of the bicycle's handle is transferred via this chain to the torque-transfer cylinder. The torque-transfer cylinder rotates in response to this torque.

The torque-transfer cylinder also has another free-wheel attached to its bottom end. This freewheel rotates with the rotation of the cylinder. The rotation of this free-wheel pulls one wheel-pair, while pushing the other wheel-pair. This assists the rotation of the axle in response to bicycle steering.

The stabiliser adds some weight (8 kg), some rolling resistance (4 14" wheels), and about 70cm to the length of the host bicycle, The turning radius of the bicycle + stabiliser combination is slightly larger than that of the bicycle alone. * description *

Benefits:

The rear-axle steering mechanism serves to stabilise the bicycle, by adding some inertia to the bike's handle-steering function -- the handlebar more-or-less stays in place if left alone.

(It is functionally similar to the training-wheels found in children's bicycles -- the bicycle can be ridden at very slow speeds with the stabiliser attached).

The stabiliser's 2 pairs of small wheels improve shock-absorption, specially under uneven road conditions. Tire-road contact area is approximately quadrupled -- hence bump-impact gets distributed over a larger absorption-area.

When used as a cargo-carrying trailer, its compact form and steering mechanism make it easier to manoeuver in traffic. Existing cargo-carrying bicycle-trailers add quite a bit of additional length to the bicycle, and have a higher turning radius and hence lower maneuveribility.

2. Design specification tool (The Specifier)

https://www.specifier.app.

A PC-app to specify a structural-assembly (such as a bicycle) is being built.

It will have to a very simple user-interface, based on InterUnit-UI, include the ability to specify some usage ergonomics and run very responsively on average PC hardware. It will not be a cloud-based app, but a native app for Windows, MacOS, and Linux.

Solidworks is the prevalent full-featured CAD tool used for all stages of industrial-design. It is a mature tool with a large ecosystem of domain-specific plugin extensions, priced at about $3000 / annum. Several cheaper and newer alternatives exist, such as: OnShape, (cloud based by the founder of Solidworks) Shapr3d, (iPad + Pen Input, Apple Vision Pro, MacOS, Windows) IronCAD, (Windows only) Alibre, (Windows only, .NET based) Fusion 360 (by Autodesk) (Cloud-based) Siemens SolidEdge (cloud based), Autodesk Inventor (Windows and cloud). It's a large and active space with constant innovation.

The Specifier will be far easier to use than existing products, since it is based on InterUnit-UI (a Khitchdee Design technology) and not WIMP-UI. It will include the ability to do some ergonomic modelling of the user of the prototype. (such as the rider for a bicycle-design prototype). It will be specialised for the specification of structural-assemblies such as bicycles. It will be a native app and highly responsive on average PC hardware. It will run on MacOS, Windows and Linux.

3. Developer Tool (Ergonomix)

https://www.ergonomix.io

The company has produced a new PC-UI design technology called InterUnit-UI, that is an alternative to WIMP-UI. It is patenting this technology. It is producing a PC-app called Ergonomix for developing InterUnit-UI based software. Ergonomix includes a source-code editor with auto-complete, a specially designed code-navigation system and an included InterUnit-UI SDK.

Ergonomix will greatly improve the efficiency of C++ app-development (due to InterUnit-UI). It will also be very easy to control using an AI programming agent or to modify (similar to VS-Code) to create a custom, domain-specific or special-purpose programming-tool.

State-of-the-art (WIMP-UI based):

Native app-UI development has to be done using WIMP-UI, which is the only UI available on all current devices. Each device has a different development language, (WIMP-UI based) app-design framework and IDE.

On Windows, Microsoft provides Visual Studio, the C++ or C# language and the Win32 or .NET framework (both WIMP-UI based).

On MacOS, Apple provides XCode, the Swift language and the Cocoa framework (WIMP-UI based).

Linux native apps are written using CLion by JetBrains in C++ using the GTK4 framework (WIMP-UI based).

All 3 available IDEs are mature and include auto-complete and AI-based generative-programming agents for automatically performing routine programming tasks.

There is also an effective (cross-device) app-UI design framework available called Flutter. The advantage of using a cross-device framework is that only one codebase in one langauge has to be written targeting a single framework. But, it's still a WIMP-based framework.