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I am looking for a set of Coax or Contra Rotating blades for a project. I'm specifically looking for something larger than the Llama blades. I'm looking specifically for a 18-20" diameter. Any Ideas? I've seen the CH46 models out there but am having difficulty finding what the blade diameter is. Also if there is anyone out there who is blade designer I may be interested in direct custom set.
On a side note what other coaxial/contra rotating rc systems are out there other than the llama and its knockoffs.