While not software, a mechanical UPD for the Eagle Craft 116 often involves reprofiling propellers or adjusting trim tabs. After 500-1,000 hours, propellers can lose 3-5% efficiency due to micro-cavitation.
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Many 2015-2020 Eagle Craft 116 hulls were built with lead-acid chargers that are incompatible with modern lithium batteries. A UPD may involve swapping the charge profile. While not software, a mechanical UPD for the