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Human elytra flying off a cliff

I imagined a person who's scapulae is overly developed and extruding outside the shoulder girdle like an elitra or fixed plane wings. 

They can be moved by shrugging the shoulders or rotated by raising the arms. 

Being them basically just big scapulae that double as elytras they are controlled by the normal shoulder muscles. 


So my question would be; how large do those elytra-scapulae need to be to allow a human to jump off a cliff and plane close to the surface of the water for at least a few minutes?