First off hello everyone. I am very new to planes. Have dozens of helicopters and cars. But this is my first plane. I went with the mini se5 bi-plane. Kit was out of stock So I downloaded the plans and cut it out. I have a bunch of parts and think I have what I need. First prop was a 6 inch and seemed under powered. Airplane lifted off but nose dived and broke the prop. I have installed a 7 x 4.5 prop and seems much better. We have had somewhat strong winds lately so I haven't had a chance for a good test flight.