# Boomerang angular momentum

So I'm building a boomerang to fly 200 feet in order to do that I was told to increase the moment of inertia to increase the resistance from change in state, and I was told that it would increase the wing tip speed,but why? According to the conservation of angular momentum when the radius increases the velocity decreases, this is why figure skaters spin faster when they pull their arms in, so shouldn't the boomerang's angular momentum decrease, because it's radius has been augmented. Note: I can't make weighted wings, because that's a little advanced for me. I have already purchased 12 mm birch plywood,so the only way I can increase the moment of inertia is to make the boomerang bigger. Try to explain to me keeping in mind I'm 16.

• What you're asking isn't very clear. Could you construct your question better?
– pho
Commented Jan 19, 2015 at 15:57
• Basically what I`m asking is why would a larger (bigger and longer) boomerang increase the rotational speed if speed decreases when the radius is augmented
– Ben
Commented Jan 20, 2015 at 6:38