Table of Contents
1. Mechanical Advantage
The Brennan Tropedo. The "Impossible Torpedo" was real - YouTube
Pulling back can propel some portion of the system forward, with some portion pushed back much harder.
Whether it happens or not depends on the mechanical details.
2. K-factor
In sheet metal bending, it indicates how much a material stretches during the forming process.
\[ K = \frac{t}{T} \] where \( t \) is the distance from the inside bend surface to the neutral axis, and \( T \) is the total material thickness.
It ranges between 0.30 and 0.50. Soft material has high K-factor, while hard materials has low K-factor.
Bend allowance is calculated from it to match dimensions.