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Old Feb 18, 2015, 08:27 PM
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Joined Feb 2015
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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)
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Old Feb 18, 2015, 09:01 PM
Hot glue held together by foam
United States, WA, Vancouver
Joined Aug 2010
3,574 Posts
Does it fly well ?
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Old Feb 18, 2015, 10:20 PM
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haven't yet tried
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Old Feb 18, 2015, 11:40 PM
Hot glue held together by foam
United States, WA, Vancouver
Joined Aug 2010
3,574 Posts
That will be the real test of the aerodynamics being in order .
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Old Feb 19, 2015, 05:03 AM
An itch?. Scratch build.
eflightray's Avatar
South Wales U.K.
Joined Mar 2003
14,409 Posts
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.
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Old Feb 19, 2015, 08:14 AM
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Joined Apr 2013
874 Posts
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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