Thank you guys !  This is a big help. <div>I will stick with the 91 size .  Why ?               1. First Low Wing   (I will not know the difference in vertical speed If I never had it to begin with.)</div><div>                                                                            2. I want to teach some kids about tork   (65  2 str. / 91 4 str. same horsepower ETC )</div><div>                                                                           3. If I go to a war bird its going to be BIG ( not a 100 size)</div><div>                                                                          4. I decided to buy a new 7 Ch. Futaba radio with extra rx for $10.00 . thus I can not afford a 120 pump.</div><div> </div><div>However I still like the idea of a OS 1.20 </div>