Sir's
About saving weight. Even though mine is quite light as used in WC (4830g = 10.54), it's good to have a solid margin that enables one to test different types of batteries (used FlightPower 5350's so far).
What I had done then was :
- Self-made foam wings; 410g (14.4 oz) per half ready for flying (my C-Arf wings was 409 when delivered). (I saved 150g = 5.3Oz)
- Foam stabs from ZN, originally for a Synergy (not very light), saved just above 40g (1.5 Oz)
- ZN Carbon gear, way lighter and nicer than the C-Arf units , save 40g (1.4 Oz)
- Build up, upen structure balsa rudder, saved around 30g (1 Oz)


I have identifyed the following further items that will save me even more :
- Carbon-spinner from Philippe Marquet , also available from http://www.f3alorenz.de/. The back-plate of this goes directly onto the cone on the Hacker motor, so you do not need to use the prop-driver. Compared to my own-made carbon-spinner with normal lightened alu-backplate I saved 35g (1.2 Oz).
- Wing tube from PBG; the one from C-Arf is rather heavy and it's not even round. The 30mm one from PBG need a couple of coats of paint to fit nicely. 20g saved on this (0.7 Oz)
- Use lighter servos, I will defenitely exchange JR DS 8455 on ailerons with JR DS 9411SA, maybe also the elevator servo. 20g saved per servo.

By these additional tricks I save another 100g, and is down to around 4730g (10.4), I think that I then have some margin for experiments. :-)