Honda BFP15D3XHT Outboard - 25" Shaft Power Thrust Electric Start Power Tilt Silver. Overview. The BFP15D3XHT is a Power Thrust 15 HP outboard built for boats that need extra shaft length and extra low-speed authority. With a 25" shaft, it's aimed squarely at sailboats and specialty transoms where a standard 20" long shaft still isn't enough to keep the prop planted. If you've ever dealt with ventilation while docking in chop, you already know why that extra length matters.. Power Thrust is the