HI AS A BEGINNER OS EASE OF OPERATION IS A MUST UNTIL YOU GET TO KNOW THE VERY UNIQUE QUALITIES OF GLO ENGINE OPERATION OS KEEPS IT SIMPLE AS IS POSSIBLE AS THE BREAK IN PROCEEDURE WITH MOST OTHER ENGINES IS A BIG LEARING CURVETAKES A GOOD DEAL OF TIME TO MASTERAND CAN PUT YOU INVESTMENT IN YOUR AIRPLANE AT RISK IF NOT TOTALLY UNDERSTOOD-OS'S BASICLY RUN OUT OF THE BOX AND KEEP YOU RUNNING IN THE AIR-DEAD STICKS TO A BEGINNER CAN COST AN AIRPLANE-THAT GETS EXPENSIVE-DO WORK WITH A GOOD INSTRUCTOREVEN AFTER YOU SOLOA LITTLE MORE POWER THAN YOU NEED IS ALWAYS BEST AS IT HELPS STABILISE THE PLANES FLIGHT-MARGINAL POWER WILL ALWAYS MAKE AN AIRPLANE HARDER TO FLY-NOT GOOD-FOR A 40 SIZE AIRFRAME GO WITH A 46AX OR A 55AX YOU CAN ALWAYS THROTTLE BACK GOOD LUCK IN THIS VERY GREAT HOBBY ENJOY REGARDS TONY-RC- 20 YEARS