Pee Wee .020 throttled combinated system

Hello comunity, a little before having the new photo of December, I want to share this curious throttle system for my favorite little cox Pee Wee that combines air restriction and exhaust at the same time.








This is a good miniature job of an unknown English craftsman, incorporating nylon bushes, seeger whasers, smooth operation, the wire rods are designed to open one exhaust port first and then another, and needle valve is strange design, I don´t know certainly how is work but when open needle fuel mix come lean and increase speed.  

I have disassembled some parts but I fear damaging it and I don't have much time now.




Here the rare needle valve, which has two holes, one axial and one transversal, which is covered by the rubber gaskets






Finally the system in operation, with an incredible idle    and very fast response    to the throttle despite having used a very large 5x3 "propeller and a very long tank line.  




Ready, let´s take off  




You can see Pee Wee spitting fuel  



I hope you like them and ask all the comments and questions are welcome



Long live the    engines  
JMCalata