On the pusher vs tractor
- tractors on a trainer are going to have the thrust line below the wing and any throttle -> pitch coupling should be throttle -> positive pitch (and sometimes even have some down thrust to counter act this)
- pusher planes almost all have the thrust line above the CG and closer to the wing (outside of a dual boom or a few other design that let the motor be better in line with the CG), if not setup correctly, they will have throttle to negative pitch coupling. (if setup correctly they still push the plane down, but without pushing the nose down). Pusher planes will also be harder to hit the weight goal because you need more material to work around the prop when building your tail boom (instead of straight out, you typically go under or 2 booms to go around)
Instead of a list of "it needs all of this," I would suggest prioritizing your goal list and start coming up with some design ideas.
One thing you can do is get the total weight expected for all of your electronics (say 10g for a receiver, 5g each for 2 servos, ESC, battery, motor, prop) subtract that from your max goal weight, and that will leave you with a mass goal for airframe construction, which will let you estimate how much foam you can use... remembering you want your WCL to be in the trainer range... which means for a 250g plane, is going to be either in the 170 sq.in. [6.9 WCL] to 210 sq.in. [5 WCL] or 170 to 185 [6 WCL] ranges - different sites give different WCL suggestions for a trainer sized plane). If we use the highest WCL from that, we get 170 sq.in., for a single layer of ROSS/DTFB, that is ~33g (170/600*115g), the TT's 2 channel Airfoil is about 1.5 thicknesses total, so just your wing's foam is going to be around 45g.
So, taking the parts I have sitting here as a quick reference:
- 10g - receiver (most of mine are about 8, but this gives some room)
- 10g - 2x 5 gram servo
- 18g - A pack motor
- 28g - FT 20A ESC w/XT-30
- 50-55g - wing (after glue/tape)
- 40g - 2s 650mAh Lipo (55g for the 3s version)
- 4g - propeller
so we are at 165+g for just the 'required' bits, you still need to build a fuslage, tail, account for the motor mount/firewall, pushrods, control horns, etc. Very doable, but you need to consider what your doing with every bit of glue/foam/etc to make sure your not being wasteful in reaching that goal.
to get that goal wing size at a 11:1 aspect ratio you would want a wing approx 11cm in cord and 100cm in wingspan (which gets you your 1m wing span)