The Wayback Machine - https://web.archive.org/web/20241114201549/http://rcwingcog.a0001.net/?i=2
FLYING WING CG CALCULATOR V3 -
OPTIONS
Units
MAC lines visible
CG position -
15% - for beginners/testing
20% - allround
25% - for experts
Other:
%
PARAMETERS
Wing span
Root chord
Tip chord
Chassis CoG
Chassis Weight
Fuselage Width
OUTPUT
Wing area (dm2)
MAC distance
MAC length
CG distance
Chassis Centroid
Image scale px/unit
PARTS LIST
SHIFT
Coarse
Medium
Fine
Superfine
COLOUR
PART ID
WIDTH
LENGTH
WEIGHT
X pos
Y pos
Rotation
Note: X pos Y pos indicate the distance from the plane tip to the center of the parts.
For actual CoG, each part is assumed to have a even density distribution within its boundary.
NOTE: THIS PAGE HAS BEEN TESTED ONLY IN CHROME V22. www.google.com/chrome
Chassis: The basic airframe or wing without any parts installed or at least without the parts that will be added to the parts list.
Chassis CoG: Determined by balancing the chassis on a rod or bar running perpendicular to its centerline. The distance from the nose to the bar is the chassis CoG. Exactly the same as finding the constructed planes CoG but without the parts installed.
Why Chassis CoG? Every airframe (or chassis without any parts added) has its own CoG. (Do not confuse Cog with Center of Pressure or with %MAC). The parts lists assumes the added parts each have CoG at their centroid (or geographical center). The wing however, due to sweep and airfoil, has its CoG generally quite a distance from its geographical center. The airframe is essentially just another part but we need to account for its variable CoG using the above technique.
Problem...It is difficult to obtain the airframe CoG when you are only in the design stage and don't have the chassis built (ie cart before the horse). Whilst it is possible with lengthy mathematics to calculate the CoG theoretically using parameters such as shape, airfoil and core density, I didn't want to complicate the site further. I generally find that people using this site have enough experience (and other wings) to estimate the chassis CoG of their design. If you are cautious with your %MAC ie say accepting a range like 19-22% rather than just 20% you can comfortably obtain a good result."
Changes: May 3013
Added ability to type in XY positions
Added Wing Area / Loading / Stall Speeds (for metric only at this stage sorry Ill get around to it)
Added explanations
Fixed Saving issues when using custom COG
Fixed saving issue for fuselage width
