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General control line discussion => Open Forum => Topic started by: Mark Scarborough on August 09, 2007, 08:45:57 PM

Title: Vector CG
Post by: Mark Scarborough on August 09, 2007, 08:45:57 PM

Gents, I have a need,, (like dont we all?)
actually I was presented with a partially assembled Vector, which I have now finished and am ready to power up and get in the air. The only drawback is that I didnt recieve the plans~manual with the beastie. Can someone clue me? especially if you have any comments about items related to trim. My plan is to use one of my "tweaked" FP 40s that are so near and dear to my poor depraved heart,,,, John Miller if your listening, I am going to try the tank setup you described.
thanks

Title: Re: Vector CG
Post by: john e. holliday on August 10, 2007, 06:39:13 AM

Just in my years of control line flying, I would start out at the high point of the wing.  The other rule I was always taught was no more than 25% of the chord.  Then you go from there to set the CG to your liking.  Always remember, nose heavy will give a sluggish plane.  Tail heavy you will have your hands full and may not have a plane in one peice.  Have fun,  DOC Holliday

Title: Re: Vector CG
Post by: Bill Little on August 10, 2007, 08:14:18 AM

Quote from: john e. holliday on August 10, 2007, 06:39:13 AM

Just in my years of control line flying, I would start out at the high point of the wing.  The other rule I was always taught was no more than 25% of the chord.  Then you go from there to set the CG to your liking.  Always remember, nose heavy will give a sluggish plane.  Tail heavy you will have your hands full and may not have a plane in one peice.  Have fun,  DOC Holliday

yep.......

Title: Re: Vector CG
Post by: Mark Scarborough on August 11, 2007, 03:57:33 PM

well thanks, I kinda was aware of the high point theory, but with as many of these as are out there flying I was kinda hoping someone could give me a number in inchs from experience to save some of the initial trial by fire flights. Due to my lack of experience flying, I prefer to start my bench trim on a proven setting and tweak from there.

Title: Re: Vector CG
Post by: Leester on August 11, 2007, 05:47:01 PM

Mark: My kit plans show it at 2 3/4" back from the leading edge.

Title: Re: Vector CG
Post by: bob branch on August 11, 2007, 06:36:33 PM

Last year I contacted Randy Smith about the Vector 40 cg, this was his reply:

"I designed it to balance  near the high point of the airfoil  which should  be  maybe  2 7\8 to  3  1\8  back. use  a  3 and  7\8  to 4 inch  handle  spacing.
I would try this  first  then  trim  to suit  your  feel."

Good luck,

bob branch

Title: Re: Vector CG
Post by: Mark Scarborough on August 11, 2007, 06:44:18 PM

Thanks guys, that was exactly what I was looking for.