Wrap it up and tie it up with your luggage. If it doesn't fit inside a luggage I doubt it will fit inside that little space they have for hand luggage. My nephew bought a huge sword from U.S. and he couldn't fit it inside his luggage on his way back ti England. So he put it inside a cardboard box and tied it up with his luggage. At first I told him I don't think they will let you take it like that, but it tuns out they did.
"I was the happiest man in the world, happier than Bill Gates"- Tamim Iqbal