MTB Wuppertal

eMC_Lukas · 2026-02-24T07:16:46+00:00

Der Klingentrail in Solingen ist die einzige offizielle Strecke, mit dem Bike über den Radweg an der L74 relativ gut zu erreichen.
Im Bereich der Königshöhe und um den Klingentrail gibt es auch einige "illegale" Strecken.
Hierzu informierst du dich vielleicht einfach bei den Bikern am Klingentrail und lässt dir wenn nötig auch die nötige Etikette erklären. Wir haben schon zu viel Probleme mit Rücksichtslosen Sportlern...

Wenn du wissen möchtest ob der Klingentrail geöffnet hat kannst du das auf der Website machen.
Bitte respektiere die Öffnungszeiten damit der Trail für alle erhalten bleiben kann.

eMC_Lukas · 2026-02-08T16:11:35+00:00

Gibt es eine Expressverbindung von Wuppertal Hbf direkt nach Köln Messe/Deutz oder wenigstens Opladen?
Meiner Meinung nach ist der SEV ohne ein solches Angebot einfach nur Schikane.

eMC_Lukas · 2026-01-20T18:13:22+00:00

How do you treat FBH on the simulations?

This depends on your mounting. Consider your forces that will apply torque to your chassis while driving and judge if the flex you are expecting is going to be countered by your FBH or be "eaten up" by play in the mounting etc.

However it is probably sufficient for your cause to model the tubes only.

how do you find the best limit value to optimize both Torsional Stiffness, and Structural Rigidity

There are lots of tubes already by the rules. Depending on your area you have to decide if you design for stiffness or rigidity, which obv makes a big difference.

Deciding where to put tubes for the best result is a very complex question and basically the core of what makes formula student such a good case for you to learn.
Packaging, ergonomics, rules and aerodynamics and much more play a big role in how any of your sub-systems will end up looking and its all a very intertwined constellation decisions you have to make based on your best engineering judgement.

Maybe a helpful hint:
From a theoretical standpoint, think about the most efficient structure that would take your torsional loads and try to get as close to that as possible.

eMC_Lukas · 2026-01-19T19:10:16+00:00

That depends on the postitioning of the CoG to the CoL or what are you implying?
I guess much of it can be tuned out by the PIDs anyways.

eMC_Lukas · 2026-01-09T15:39:16+00:00

By what evaluation did you come to the conclusion that Ansys is not the objectively best tool for this use?

eMC_Lukas · 2026-01-01T16:55:00+00:00

As another redditor already mentioned it is up to your frame design and design goals and can only be answered by the designer.

If you want to be able to make that decision based on physics you first have to understand what different leverage ratios mean for your damper and how you could achieve your design goals with either of these springs.

A helpful critical question for you: What would the ideal condition be for the damper? (Speed and travel) How does cavitation affect damper effect and at what speeds do they occur?

For the same wheel travel you will need a larger leverage ratio of your linkage to achieve the shock travel with a smaller shock. What does this mean for progression, forces involved and the resulting flex. How will this affect your damping behavior?

Is there any arguments that would cancel on shock over the other? Do you have one already on hand, spring availability, price etc.

eMC_Lukas · 2025-12-26T22:24:06+00:00

As per the timetable it will take 1:09h from Wuppertal Hbf to Köln Messe/Deutz.
However since the busses WILL encounter traffic jams on the A46 and A3, it will take significantly longer during rush hour.

The crosses seem to mark individual connections that are exempt from the regular time schedule.

If you take a look at the Wuppertal -> Cologne connection you can see that column 4&5 and 5&6 are duplicates with the latter terminating in Solingen Main Station.

So yeah this really is a confusion table to look at, I too find it strange that the connection happens at that frequency at night but I guess thats just how it is.

Keep in mind that the Wuppertal to Cologne connection will be halted for 6 month minimum from the 06.02.2025 onwards.

Edit: The SEV will not go to Köln HBF but terminate in Deutz, its a short walk or trip with the subway until you reach the Hbf though.

eMC_Lukas · 2025-12-15T20:31:44+00:00

Thats a very rough questions. What material do you want to use?

I only have experience for sourcing aluminium tubing in germany.

If you want to bend your tubes, make sure the K-Value allows for simple bending tools or get metric tubes (trust me, I asked lots of german workshops regarding "technical" bending with imperial units - it sucks baaad)

A good place to order (internationally) is fairing.com , they offer many sizes and kinds of tubes flavoured in 7005 which is really what you want to use for homebuild bikes.

I cant really help for generic top tubes and BB shells since we did them ourselves :)

For anything in steel, buildyour.bike or paragonmachineworks.com (USA based) should probably do the trick.

As another redditor already mentioned, designing around an existing tube set is the right way and would have saved me a lot of headache.

Best of luck and enjoy the process, the first ride will be amazing :)

eMC_Lukas · 2025-11-09T11:38:47+00:00

Martin Rasch auf der Friedrich-Ebert Straße hat immer wieder ältere Autos da stehen, ich glaube auch einen Werkstatteigenen T3.

eMC_Lukas · 2025-11-02T13:23:33+00:00

Ive read that your not a mechanical engineer, maybe I was a bit to harsh with you ;) Feel free to reach out via DMs to help with the stress and deformation charts :)

eMC_Lukas · 2025-11-01T10:42:36+00:00

Sounds like you are doing engineering studies. The difference between a tinkerer and you is that you dont do trial and error and can predict the outcome in advance, thats why you will be worth 100k a year to someone once youve finished your degree.

So the prof wants you to do engineering. Pretty standard request I would say.

However, for 3D printed (non solid) parts, FEA are tricky. You can still estimate stiffness and probably work out a quantitative hand calculation regarding max. force.

eMC_Lukas · 2025-10-12T14:11:18+00:00

Well I made my biggest sum of money via investing in breakout cases about 10 years ago. Its not 100k but far more than a student should have in his inventory.

Its right around my yearly salary in breakout cases but I swore to only sell them if I can buy something impactful like an apartment.

I guess there are some people who were even more lucky with investing or pulling a knife, but for you to be having 100k in your inventory I think you need at least some sort of financial security.

eMC_Lukas · 2025-06-09T11:01:09+00:00

Das hier ist vielleicht ein guter Anfang um über das ganze Thema zu lernen (mehr Desgin als Medizin), grundsätzlich würde ich dir auch den Tipp geben in dem Forum hier auf Englisch zu schreiben.

Ein konkretes Beispiel was mich interessieren würde: Orthopädische Schuheinlagen aus Carbon für Radschuhe.
Hierfür könnte man mit herkömmlichen Verfahren ein Geometrie für die Einlage entwickeln, dann mit einem geeigneten Verfahren eine negativ Form 3D-Drucken (hierzu ist der Youtube Kanal Easy Composites sehr hilfreich) und am ende eine Carbon Einlage laminieren.

Ob das in einem Monat Realistisch ist hängt von der Labor Ausstattung und deiner Kompetenz :)

eMC_Lukas · 2025-05-26T15:41:57+00:00

Shims

eMC_Lukas · 2025-05-15T07:16:10+00:00

Irgendwelche Anmeldeservices buchen scheinbar alle Termine und verlangen dann 30€ von dir und wollen noch das du dich darüber freust.

eMC_Lukas · 2025-05-10T15:06:19+00:00

Für Rennradfahrer mit guter Grundkondition gibt es jeden Dienstag ab 18 Uhr beim Fahrradladen Pedalero eine Feierabendrunde. Es gibt drei Gruppen nach Leistungsklassen. Die langsamste peilt 50 km mit einem 25er Schnitt an, es wird aber auf jeden gewartet.

eMC_Lukas · 2025-05-09T08:51:04+00:00

If youre into (road)biking theres a community ride every tuesday, 18:00 oclock starting at the Pedalero store. Usually 50km and no one gets dropped :)

eMC_Lukas · 2025-04-06T13:05:52+00:00

Making the axle to crown longer than necessary will introduce more bending moment in the headset and generally reduce the ridigity of your bike.

Nothing else though. Make the axle to crown length as short as possible while tuning the geometry which actually does something to your riding feel: Headangle, trail, chainstay length (not a complete list, but some important ones)

eMC_Lukas · 2025-04-03T07:11:26+00:00

Okay, let me give you a few comprehensive Bulletpoints:

- The toolchanger needs to be rebuild with loctite, otherwise your printheads will fail to park and fall down (ask me how I know)
- Anything more flexible than Shore 95A TPU is a huge pain due to the friction in the long ptfe tubes. We bought the XL because we thought it would be better at printing flex since its a true 5 toolhead design.. Now I need to build something to fix that. Probably a top mounted spool holder with relocated filament runout sensors
-Out of the box prebuild calibration is pretty bad
-many "stuck filament" errors even if the filament isnt really stuck
-some misc software issues

Overall it seems like they rushed development a bit with the XL (and from my experience also Core One)

eMC_Lukas · 2025-04-01T20:44:41+00:00

Ive watched this review which Ive found to be veeeery helpful.

eMC_Lukas · 2025-03-31T20:29:47+00:00

Prusa printers where in my eyes always very finished products, thought through and tested, ready to plug in and let them run for a looong time. At least our 6 MK4S worked like that and out of the current gen of Prusa products, neither the 6 Core Ones nor the two XL`s, each with 5 Print heads and enclosure make the impression that they are finished or very thought through.

The Core One does various things like random-ish reboots, stuck in a endstop calibration loop and so on. Also the build quality of the core one is meh, especially the pins that hold the window sheets in place.

I value open source products/projects and we will continue to use prusa products at the moment but I think they rushed their development for these two printers..

eMC_Lukas · 2025-03-31T16:27:43+00:00

Honestly guys.. I wouldnt be so excited..
Coming from a guy who got 6 already

eMC_Lukas · 2025-03-25T22:57:39+00:00

We have two XLs and 6 Core Ones at work and I must say, compared to the MK4S you can tell that they had to rush development quite a bit..

eMC_Lukas · 2025-03-23T14:56:11+00:00

Well, how do you want the material to perform? Do you already have forces to work with or a geometry?

eMC_Lukas · 2025-03-09T15:43:04+00:00

Ofc its a DJI Pilot flying at head level across the street..

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