Kerrisdale Capital Management has raised concerns over the feasibility and safety of Joby Aviation's electric vertical-take-off-and-landing (eVTOL) planes, questioning the company's $4.8 billion valuation. The concerns revolve around the energy consumption, production capability, and safety of the eVTOL planes. Joby Aviation's ambitious plans of producing thousands of aircraft annually at a unit cost of $1.3 million are also under scrutiny.