RCU Forums - View Single Post - Carl Goldberg Ultimate 10-300 Brotherhood.
Old 05-26-2019, 07:57 AM
  #2248  
J.Paul Saure
 
Join Date: Sep 2002
Location: Concepcion, CHILE
Posts: 352
Likes: 0
Received 0 Likes on 0 Posts
Default

I use the simple CG machine from Greatplanes...
https://www.towerhobbies.com/cgi-bin/wti0001p?I=LXK259

Before the first flight (years ago) I measured CG WITH the top wing.
Much later, when shifting the CG back for fine adjustment, I just measured WITHOUT the top wing, as I just wanted to measure the CG "shift" and not the actual CG. So I do not compensate...

Sadly I forgot to write down the first CG position so I don't know where it is "now".
I only know it is 6mm (1/4in app.) to the back as before...!
I normally place the first CG in the middle of the suggested range...

I flew the plane yesterday and I'm sure it can handle even another 1/4in (6mm) to the back...

Saudos,
Jean Paul