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The jury is in: the 10 most efficient, streamlined paper airplane designs have been discovered and curated here in this book.
Reach ever newer heights using the 56-page design guide full of tips and tricks, like lessons in lifts versus gravity and defining "dihedral" for aspiring aviators (it's the angle between a plane's wings.) Each plane model even includes the type of flyer it is, the level of difficulty in making it, and whether or not it can be flown indoors and outdoors. With such models as the Swashbuckler, the Pteroplane, the Flying Ninja, and the Space Cruiser, you'll wonder why you've been folding that same old tired airplane all this time! Use the 40 sheets of colorful, aero-dynamic folding paper to fly in style.
Nine year olds are clever little fellows and have lots of interests. Great presents for 9 year old boys are remote controlled cars or flying objects, science construction kits, anything that shoots, or outdoor gear. Magic is popular and anything involving pranks will appeal to that 9 year old sense of fun. Or get them a great book.