vector c/g

[Bootlegger]

  Guy's I finally got my vector arc finished and looking at the instruction booklet I didn't fine suggested c/g/ balance point.
   I have an OS LA 46 in the engine compartment.
 Seems that there was some info about this a while back, but I couldn't find it...
  Thanks a lot,

[RandySmith]

And easy way to get close, is to balance the Vector just foward of the high point of the wing at the Root...this would be the point where the wing is the thickest, adjust to suit after that

Randy

[Tim Wescott]

And easy way to get close, is to balance the Vector just foward of the high point of the wing at the Root...this would be the point where the wing is the thickest, adjust to suit after that

Remember that no matter what you do initially you'll still be wanting to adjust it after you fly.  You just need to find an initial balance point that'll let you keep the plane in the air, so that you can go from there to get it all trimmed out.

[Michael Massey]

I'd like a little feedback here.  My current flyer was giving me a problem on the second turn of the outside square.  The lines would get a little loose after the initial dive and I would have to "jerk" the down control to get the second corner.  Not a great feeling.  Anyhow, the CG seemed OK.  The plane is very stable etc.  Anyhow, I experimented with CG since I had tried a number of other trims to correct the loose line problem and nothing was working.  I added tail weight and, at first blush, it appears to really help that problem.  I initially added 1/4 oz and that, pardon the expression, seemed to "turn the corner" on the loose lines.  I added an additional 1/4 oz but the wind came up and I couldn't tell if the condition got even better or remained unchanged from the initial 1/4 oz.  I'll try again this weekend.

In any event, the plane is still stable, glides very nicely and the additional tail weight seemed to really help the loose lines on that second turn of outside squares. 

What experiences do you guys have with the loose lines and CG adjustments?

Tx.

Mike

[Larry Fernandez]

Where do the lead outs exit the wing, relitive to the CG???

Should be about 3/4 of an inch aft of CG to start with.

Larry, Buttaffuco Stunt Team

[Michael Massey]

Before resorting to CG adjustments, I tried many adjustments of the leadouts.  Both forward and aft of CG in relatively minor increments.  None of those adjustments dealt with the loose lines on the outside squares.  I have always had decent line tension on the overhead stuff.

[Bram Anker]

I balanced my Vectors as per plan, some 7 inches forward of the flap hingeline and although I tried moving it both forward and backward but eventually returned to the design location notwithstanding that I moved the stab 6/8 inch farther back (which would make it possible to use a little more rearward CG) I have had the same problem with yawing in after the first corner of the outside square and solved it largely by moving the leadout 5/8 inch behing CG location which was 2/8 forward from the original position and using only the smallest outward rudder deflection (trim to fly as tangent to the circle as possible). It doesn't solve it completely but enough, although on my next plane I will change my setup so the up-leadout is in front of down. Also try to use as light a propeller as you can. With these measures I don't think the problem is serious anough to revert to a Rabe-rudder.

Rgds, Bram

[Bootlegger]

       Fellow's I sure do 'ppreciate all the advice. Randy, I'll look at the set-up you suggested..
   Again I think this forum is a GREAT one..  Thanks Sparky, ya' done gooood...