Helihand
Here’s how to make a rubber band helicopter similar to toy that inspired the Wright brothers to build a plane – “It doesn’t have a bearing and is therefore very simple to make, however you must have a long bit of split bamboo which must be thin and flexible enough to bend into a loop. Some window blinds are made of suitable material, some are made of bamboo which has been extruded into a round section, this isn’t really sufficiently flexible.”Link.