In the March issue of Soft Robotics (vol. 4, no. 1; pp. 23–32), the article entitled Soft Pneumatic Actuator Fascicles for High Force and Reliability by Matthew A. Robertson et al. requires correction.
Upon close examination of the published work, the authors found that there was a missing minus sign in Equation (1) of the published version of the article.
The original Equation read:
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The correct form for the force output of the actuators should be written as:
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The negative sign in the first term reflects that actuators are working in extension. In the classical formula [6], this term is positive for actuators working in compression.
Despite this inadvertent omission, the correct formulae was used to produce all the calculations and figures throughout the published work.
The online version of the article has been corrected to reflect this.