Minecraft 2elytren again?

I really searched for a long time but I only find endercitys without a ship I only need 1 ship because my buddy also wants an elytra. Are there any tricks?

Fly with your Elytra and fireworks rockets very far in the direction, then you can even find an end ship in under 10 minutes

Can you tell me if there's also a second end head? And how many rockets do I use?

So with every ship there's exactly one ender dragon head