No one has pegged the facts concerning the TT PRO 40 as being the "official" AMA 424 spec engine. I have went through the AMA 424 rules and am either blind or simply can't find where any other 40 engine is not allowed as per the following.
AMA Contest rules starting on page 18 for 428 and page 19 for 424 have no mention of TT PRO 40 or any other specific engine. Are you telling me that if I show up at a AMA sponsored 424 pylon race I will not be permitted to fly with anything but a TT PRO 40? I will have to pack up and go home?
Rule 16.2. starts with general airframe guidelines for 428 and 424
Rule 16.3. begins 424 guidelines
Rule 16.3.2 begins powerplant guidelines
No mention of any specific engine. What am I missing here? I am just asking for someone to show me where a AMA 424 event mandates the TT PRO 40. I have no problem with running it but I just want to see the mandate. Is it a NMPRA mandate or an AMA mandate? If so who has the upper hand...NMPRA or AMA?
I'm just asking questions here!