</p>

  Arch,</p>

  We have been flying the 170 glow version with the 17x13 with excellent results, installed the CDI on the same perfectly running engine with the 19x11, and Tuny's Passport flew like crap!!, I mean, no constant speed, accelerated much slower, and the aircraft was faster even if it had lost a lot of the vertical authority, swapped back to 17x13, and flew beautifully again. The propeller change was due to all this post where it has been stated the best propeller is the 19 for the CDI, in our opinion it is not  a good choice. We run COll Power 30/23 and Power Master 30/23.</p>

  Better transition, yes, better idle , well unbelievable idle I will say, but we do not fly at idle and transition is just that, the engines now behave the way we want, but again, is also a matter of taste, if you like the engine with the 19, I understand that's the way you fly and like the performance, but I also think that too many people read this posts, and some times people believe what they read, and not always is the correct analysis, so I have to expose certain parameters that have not been taken in consideration so all the people who are interested and what we all say can have as much information as possible to get to the right conclusions.</p>

  Regards</p>