Can Palm Logs Float? Evaluating the Physical Viability of Raft Transport for Rapa Nui Moai

Recent suggestions that palm log rafts may have transported moai statues on Rapa Nui require evaluation of whether fresh palm wood can provide sufficient buoyancy for multi-ton cargo. This analysis integrates experimental flotation tests, structural analyses of palm stem anatomy, and buoyancy calculations using modern palm analogs to reconstruct the extinct Rapa Nui palm. Fresh palm logs sink when placed in water because of their internal structure: stems consist of approximately 20% liquid by volume, contained within thousands of water-filled vascular tubes, surrounded by a thin, brittle cortex. This yields effective densities of 800–1,200 kg/m³ that approach or exceed seawater density. Even logs that barely float provide essentially zero freeboard for cargo, while concentrated statue loads cause structural failure through the cortex. These physical constraints, the absence of sunken moai, the rapid decomposition of palm wood, and Polynesian watercraft capacity limits that preclude moving average-sized statues, together demonstrate that water transport of moai was physically impossible. Overland transport was the sole viable mode of transport on Rapa Nui.