This K'nex helicopter is based on the no longer produced model 17036 Helicopter Kit except I'm using the smaller K'nex pieces. There should be enough pieces in the 35 model and 50 model kits to be able to build this. Hope you enjoy this build.
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Step 1: Parts Required for This Build
Step 2: Build the Base of the Helicopter
Step 3: Build the Helicopter Body
Step 4: Build Helicopter Body (part 2)
Step 5: Add the Helicopter Propeller
Step 6: Finish Model
If you want to build the original helicopter model which uses the larger size parts, you can find instructions for that on the knex.com website.