Flame speed is a sizing metric of a fuel to be considered in designing energetic industrial systems such as IC engines and gas turbines. Indeed, this physicochemical property of a combustible mixture notably influences the heat release rate and flame stabilization. Moreover, its significance makes it a major target for the validation of kinetic mechanisms. For example, the flame speed of ammonia or ethanol is around one fourth compared to traditional hydrocarbon fuels. Flame stabilization difficulties, possibly encountered in industrial systems, can be solved by technical adjustments (i.e. air preheating, compression ratio increase, oxygen-enriched air, co-firing with methane or syngas). The accuracy of experimental flame speed determination (target data for numerical schemes) for slow flames is the main issue to be addressed here.