Determine mechanical properties of a spiral wound spring with blade width *b*, blade thickness *h*,radius *r*, Young's modulus *E* and *L* as spring length. Calculate also deflection *v* and tension *σ* as a function of force *F*.

\(k=\dfrac {\ Eb^{2}h^{2}}{12Lr^{2}}\)

\( v_{(F)}=\dfrac {\ 12FLr^{2}} {Eb^{2}h^{2}} \)

\( v_{max}=\dfrac {\ 2rLσ} {Eh} \)

\(σ_{(F)}=\dfrac {\ 6Fr} {hb^{2}} \)