New treb problems

So after last years Lake Orion Pumpkin Launch we had to remake the medium trebuchet, for the third time. This time I decided that it would be good to create an OB jr. team. The medium treb is theirs, wi fli hi, is the name. I'm not really sure what it means. The thing is that we have done this several times and, even though we did change a couple of things, we are always running into problems. I just can't seem to figure this stuff out without an actual trial and error. Maybe by next year I will be able to just build one and have it work. We will be launching it this Saturday at Barn Daze in Orion Township. Should be fun.