|Feb 18, 2015, 08:27 PM|
Joined Feb 2015
my 2nd scratch built
Hi i am new to scratch building i did 1st airplane did take off vertically but never running takeoff.
Anyways now i built new one please see pictures of it and let me know if the dynamics or the way i built is ok with aero-dynamics?
1. Wing Span 1500 mm
2. Fuselage 900 mm
3. 1500 KV motor with 7'4 prop
4. 25A ESC
Battery 2200 mAH 11.1V (i use same all over as having one only lol)
|Feb 19, 2015, 05:03 AM|
Assuming the model is using just rudder, not aileron, (I could not see any ailerons), the wing will need some dihedral, or you may find it either doesn't turn or is extreemly difficult to turn.
It's great that people are willing to have a go at designing and building their own models, but it is a good idea to base them on know working designs. That includes things like any incidence angles, any dihedral angle, and any motor thrust angle, balance point, (CG), - all can be important fora successful first flight.
|Feb 19, 2015, 08:14 AM|
Joined Apr 2013
The primary problem on your first build was too high wing loading (several of us agreed on that).
So what's the wing loading on this one?
What's the chord? (you gave span but not chord).
What are the dimensions of the tail surfaces?
Do you have ailerons?
Do you have a spar in the wing?
Finally, as others have mentioned, starting with a "known good" design and then tweaking it is a lot better for a new builder. Fly it before tweaking so that you can know what effect your changes had.
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