I am starting a PBY plane kit. The old article calls for “ 2 size OS .1 engines. Could go up to .15”
The wingspan is 63”, estimated weight is 5 pounds.
What would that be for a brushless motor?
I’ve not touched a glow engine for some time. My recollection 15 size engine is a bit small for a 5 pound plane. I’m thinking a took a 30-40 size engine is more appropriate.
Here are some guidelines that may help. It’s the total flying weight of the plane that you need, including motor and battery.
• 50 to 70 watts per pound is the minimum level of power, good for park flyers and lightly loaded slow flyers.
•70 to 90 watts per pound is perfect for trainers and slow-flying aircraft.
•90 to 110 watts per pound is good for fast-flying scale models and some sport aerobatic aircraft.
•110 to 130 watts per pound is what you want for advanced aerobatics and high-speed aircraft.
•130 to 150 watts per pound is needed for lightly loaded 3D models and ducted fans.
•150 to 210+ watts per pound gives unlimited performance for any 3D model.