4s mini mustang
All right! So good luck with the new build! Just a few tips for next time though. Make sure that the servo arms are perpendicular to the pushrod if possible. For example, it should be pointing straight up on your elevator instead of a bit forward. Also if your wire bends you can tie a zip tie around the wire, tight enough so that there isn't too much play but loose enough for it to slide around on the wire. Then stick the end of the tie into the side of the plane and glue it in place. Trim the end so that it is the right length. I do this on a lot of my planes to act as a guide for the pushrod so that it won't bend under pressure. I'm not sure why your plane would be so tail heavy especially with the longer nose. What size lipo are you using and where is it in the plane? Is it all the way forward?Hi Everybody -
Wow! Thanks for all the replies and the advice. So to answer a couple of the questions that have been posed:
So thanks again for all the help and advice. I will post again after I build the new plane. I think that I should do this BEFORE I go ahead and try to build the duct tape plane!
- Crap! The dihedral on wind is not symmetrical. I used a dihedral on both sides when I built the wing and at the root they both have an angle of 15 degrees. However, the left side is straight and has a vertical height of 1 7/8" at the tip, but the right side is bowed upward such that its vertical distance is 2 7/8". Its obvious as I look at it now...
So that results in the left dihedral generating about 4% greater lift than the right.
- Thrust angle is 2 degrees right and 2 degrees down. At least that is the starting point. All bets are off once I crash.
- I probably did launch it at too high of an angle. I wanted my friend to take a video, so I launched it by myself.
- I didn't think that the elevator could make that much difference. BTW - the control surfaces were all trimmed to be level and I didn't even have time to adjust the stick.
- The control rod is shorted than the original design. I didn't notice the bent rod, but again the control sufaces were all level at launch.
- I did a test glide and it flew straight and level.
- The one issue that I have with the CG is that I always end up tail heavy. Is there a concern that adding putty as ballast would make the plane too heavy? This is the primary reason that I increased the length of the nose.
- And yes - I thing my tweaks are causing too many unknowns. Since I need to rebuild, I am going to follow the plans to the T. Also the CAD model is just an aside, I teach CAD to sophomore mechanical engineers, so creating a solid model is just 2nd nature.