Originally Posted by CBY
I don't have reaction bars on my MOG, but a rough structural calculation of the energy to destroy the reaction bar.
I take as hypothesis  for the reaction bar :
diameter 25mm
thickness 2mm
length 500 mm
angle : 45°
force at chassis level : 5000 N (~500 kgf)
mechanical stress : 53 daN/mm² (over elastic limit)
Energy : 40 J (Joules)
Energy of a 900 kg car at 36 km/h (10 m/s) : 45 000 J
ratio : ~1/1 000 (40 /45 000)
If you have the dimensions of the reaction bar I can update the calculation, but I think it cannot change the conclusion.

Hi CBY,

Hope this finds you well. Thank you for your post.

Forgive me, as I love theory but experience, actually being there, so often trumps theory with trads. For example, their flexing chassis frame is unknowable as EACH
is different and become more so as they are used. JHS2 used to say that "I never speak of something I haven't seen or experienced myself".

Below is what racers and some moggers used to (and many still) use as brake reaction bars.Can you estimate whether THEY will affect the absorption of force in a
frontal trad impact at speed? Do you think they might inhibit absorption? innocent One learns LOTS with trad mileage and race crewing. Some here have shared
that with me. As one example, I carefully read everything Arwyn writes. I love anecdotal learning.

Whenever one has a doubt about a harmless non-invasive hint, that costs nothing, DO IT. There is no downside. Can't say the same about ignoring it.
Best to you, (as Sheally used to say)

Lorne

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