TR550-602 - Tronhelicopters - Tron 5.5
The 520mm blade size conversion kit gives you the easy option of converting the 5.5 to a 5.2.
You can enjoy smaller batteries like 4000mHa or 4500mha while still having a perfect center of gravity and all the fun and agility a 5.2 size model can offer.
Tron - 5.2 Conversion Kit for Tron 5.5