==Weight?== 
 The article says: 
 :"With limited engine power, aircraft could only afford a certain amount of weight, and therefore were made of mostly canvas and wood.  Therefore, planes flown improperly, such as not cutting off the engine in a dive, would suffer structural failure due to G-forces." 
 I'm less than convinced weight & engine power governed construction in wood & canvas, & I know this didn't affect structual strength.