Erratum: Martens, M.; Boblan, I. Modeling the Static Force of a Festo Pneumatic Muscle Actuator: A New Approach and a Comparison to Existing Models. Actuators 2017, 6, 33

The authors would like to correct the content of Table 2 and the text above Table 2 in their article: Modeling the Static Force of a Festo Pneumatic Muscle Actuator: A New Approach and a Comparison to Existing Models (https://www.mdpi.com/2076-0825/6/4/33).

The unit of the correction angle $d_0$, given in Table 2 of [1] on page 8, and the text above, is not degree but radian. Therefore, the angle correction is:

• $d_0=-0.10\mathrm{rad}=-5.7296{}^{\circ }$ for the DMSP-10-250 and
• $d_0=-0.073\mathrm{rad}=-4.1826{}^{\circ }$ for the DMSP-20-300

such that the correction of Table 2 is given by:

	${\mathit{c}}_{\mathbf{0}}$	${\mathit{c}}_{\mathbf{1}}$	${\mathit{c}}_{\mathbf{2}}$	${\mathit{c}}_{\mathbf{3}}$	${\mathit{d}}_{\mathbf{0}}$
DMSP-10-250	$74.085\mathrm{MPa}$	$-689.20\mathrm{MPa}/\mathrm{m}$	$1.8370\mathrm{GPa}/\mathrm{m}{}^2$	$-848.79\mathrm{MPa}/\mathrm{m}{}^3$	$-5.73{}^{\circ }$
DMSP-20-300	$93.232\mathrm{MPa}$	$-715.29\mathrm{MPa}/\mathrm{m}$	$1.5483\mathrm{GPa}/\mathrm{m}{}^2$	$-502.95\mathrm{MPa}/\mathrm{m}{}^3$	$-4.18{}^{\circ }$

The authors apologize this literal mistake, but emphasize that the content of the article is still correct. The manuscript will be updated and the original will remain online on the article webpage, with a reference to this Erratum.