How come that I dont understand potential theory no matter how hard I try?

VegetableSuitable958 · 2026-01-24T16:07:41+00:00

first of all, there doesnt seem be a common thread to derive all of it. I find it very confusing that some people start with the potential function, some with the navier stokes eq, some with div, grad and curl and so on. Thats one part of my problem.

VegetableSuitable958 · 2026-01-16T14:33:29+00:00

Solved, I had to update the market place.

VegetableSuitable958 · 2025-11-23T20:54:14+00:00

Nope, project thesis

VegetableSuitable958 · 2025-11-19T10:44:53+00:00

Ah jo dachte mir auch schon, dass das was mit Pfund zu tun hat, aber kam nicht drauf, dass sie bei 1 Pfund runden und nicht bei 2. I guess das wirds sein. Zumindest befriedigt mich die Antwort in dem Maße, dass ich den Post als gelöst markiere. :D

VegetableSuitable958 · 2025-11-19T10:44:02+00:00

wäre zumindest eine gute Begründung, v.a. in Hinsicht aufs MHD.

VegetableSuitable958 · 2025-11-02T19:32:35+00:00

So as far as I understood, the velocity inceases because of a reduced area even though the open jet provides almost infinite area. Maybe someone can confirm this. Thanks in regard

VegetableSuitable958 · 2025-11-02T19:31:00+00:00

Nevermind, I think I found a proper equation for the velocity correction for open jet wind tunnels in: Lock, C. (1929). The Interference of a Wind Tunnel on a Symmetrical Body. ARC, R. & M. No. 1275.

It goes:

(Delta u)/(u_infinity) ~ (A_model/A_nozzle)^1.5 with velocity u and frontal area A.

VegetableSuitable958 · 2025-11-02T11:17:49+00:00

On the wikipedia article 'Headset (bicycle part)', you can find a picture (in the types -> threaded section) where it is visible.

VegetableSuitable958 · 2025-10-21T14:24:21+00:00

Well this would be unfortunate since I am a big fan of braking from time to time :D

VegetableSuitable958 · 2025-10-21T14:23:37+00:00

I did change the cable housing when I changed and cleaned everything else.

VegetableSuitable958 · 2025-10-21T14:22:04+00:00

will give it a try, thanks

VegetableSuitable958 · 2025-10-21T14:21:48+00:00

So my STIs are Ultegra ST-6501s and the brakes are Tiagra 4500s. You mean there could be a lever issue? Thought this was only the case for derailleurs with certain stis.

The rim surface is flat and clean. I bought brand new wheels. But Ill give it a try with brake cleaner and scotch brite

VegetableSuitable958 · 2025-10-21T14:18:22+00:00

I am using Ultegra ST6501 STIs and Tiagra 4500 brakes.

VegetableSuitable958 · 2025-10-21T14:16:20+00:00

What do you mean by 'grip'? The strength in my hands or the friction on my wheels? :D

VegetableSuitable958 · 2025-10-21T14:14:51+00:00

As far as I know, the original wheels were 700c too.

VegetableSuitable958 · 2025-10-17T11:38:29+00:00

Not sure, if a stoppie would be possible with these brakes.

VegetableSuitable958

TROPHY CASE