I've held out and avoided the electric for a long time until now so i have questions. I hate being a newbee again. I created a foam delta wing with a 36" wingspan. It weighs in at about 29 ounces fully loaded. Power is eflite park 450 brushless outrunner with eflite 40 amp esc. Brake is disabled. Manual states motor is good for scale park flyers up to 30 ounce . LHS recommended APC 10X7E "thin electric" prop. (not slow flyer) Manual recommends 10X5 to 12X6E. Manual states 890 rpm per volt which comes to 9879 rpm. I am getting around 7500 with 3cell 11.1 volt 2100 pack. Am i over-propped or this a good speed for the set-up? Weather permitting, test flight will be tomorrow morning. I was going to use a spare Align 430XL from my trex collection but was advised that was a bad idea however, the align motor manual includes a prop chart. Does that refer to using a gearbox maybe?