Hi

Interesting. I am only used to working with Weight/Lever Arm Envelopes. You have a MOMENT envelope. I can't be sure if the MOMENT points from that envelope should be used in SkyDemon (SD). I need to get my head round that. Might be ok? SD recommend you do the conversion

I can't see a CoG value for your aircraft. That should be in the POH. It might be 1.003m (100.3cm). Need to check that.

I don't know that it matters that you have gone anticlockwise round the envelope. I put mine in clockwise. (so your 2nd point would be 790,890). SD recommend clockwise.

Personally I would find all the lever arm/weight coordinates for the Normal category (assuming that's the category you'll mainly want to fly within).

They are usually in the POH and probably the ones you should use but you can get good approx figures from your envelope image knowing that

Weight x LeverArm (dist) = Moment

so

Lever Arm = Moment/Weight

Your first envelope point is approx. 620,700

Convert the 620 Moment to Lever Arm. ie 620/700 =0.8857 m or 88.57 cm (if you prefer cm)

so first envelope point is 88.57,700

Similarly 2nd envelope point 790,890 becomes 88.76,890

Good Luck .... and do check my maths!!!!!

Richard