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General control line discussion => Open Forum => Topic started by: bob branch on May 31, 2006, 09:06:05 PM

Title: vector 40 balance point
Post by: bob branch on May 31, 2006, 09:06:05 PM

Help!!! What is the balance point on the Brodak Vector 40 (arf, or arc) but I'll take the kit balance point too.


bob

Title: Re: vector 40 balance point
Post by: Sam Laughery on May 31, 2006, 09:17:11 PM

According to the kit plans it's 2 3/4" back from the leading edge.

Sam

Title: Re: vector 40 balance point
Post by: bob branch on May 31, 2006, 10:15:02 PM

Thanks. The ARF book says 1 7/8 inch aft. It looks really wrong on the airfoil and would take in the vacinity of 2.5 oz of lead with a Brodak .40 to balance it there.

Have you flown it at the 2 3/4 inch point? Is it close to trim at that point?

bob branch

Title: Re: vector 40 balance point
Post by: Ron Hook on May 31, 2006, 11:07:31 PM

I have flown a Vector 40 for the past 6 months and love it. That is a good balance point for the plane. I started out just a little nose heavy and after getting to know the plane a little, I changed to just level balancing for better flight.

Ron Hook

Title: Re: vector 40 balance point
Post by: RandySmith on June 01, 2006, 10:09:37 AM

HI Bob

you can balance it  just ahead of the height of the airfoil at the root,  maybe  around  2 7\8 inch,  adjust it after you fly to  suit your  feel  of the plane.  use  a  handle  with a  4 inch  spacing

Regards
Randy

Title: Re: vector 40 balance point
Post by: bruce malm on June 02, 2006, 10:48:20 AM

I have a lot of the  Brodak ARFs that will let me determine which I like best for my style etc. before building from kit or plans.
I have noticed the balanceing instructions on the ARF's are often not very specific and vary from each airplane.
The Vector instructions seem to imply that you measure back 1 7/8" at the tips which would translate to about 2 3/4" > 2 7/8" at the root. John, since you frequent this site I would recommend you include in all future ARF's and ARC's a side profile drawing (8x11),  with the correct location of the CG as included on most plans and this would help solve some of the confusion and reduce the likelyhood of an unbalanced and miserable flying airplane.

Thank you,
Bruce