On Sat, 10 Apr 2004 21:08:10 GMT, Richard Lamb
wrote:

Stealth Pilot wrote:

On Sat, 10 Apr 2004 16:06:27 GMT, Richard Lamb
wrote:

hedge trimming

From the plans, the CG Range is 15% to 28% of the chord.
Figuring the chord as 48 inches, that means 7.2 inches forward limit,
(aft of leading edge) to 13.44 for the aft limit (also aft of LE).

(That 15% forward limit seems awful far forward to me - but it woiks)

the actual flight tested values for my aircraft are 10.4" forward
limit and 16.5" aft limit.


That sounds like a lot more reasonable range to me.
20.8 to 34.3 percent chord.


1300lb auw (well actually 590kg with an empty weight of 362kg.
empty cg moment arm is 214mm.

See, THAT's the problem with the metric system...

Is that supposed to be mm, or cm ???

millimeters.

Also, where is your datum for this measurement?


214mm is a tad over 8 3/8" back from the only datum used on the
tailwind :-)
recall that it will always have a pilot added to the empty weight and
you dont actually fly with empty fuel :-)

crumber nunch away. I'll bet you get close to 65lbs as the maximum
download.

(just remembered where my number comes from. future son in law is
doing his commercial studies, worked the numbers with a few
guestimates where there are no aerofoil data. aerofoil data is what's
needed.)
Stealth Pilot