Just a small heads up for FAI.

The excess fuel needs to be available to the engine, and it must join the engine fuel system.

 You can't have water in the tanks!

Fuel in wing tanks is unlikely to help CG.

Correct,  but propulsion  battery's do not count in the all up weight. As pr. liquid fuel

Radio battery's must be connected to make a working radio system,

So if your radio works off the main propulsion battery you would be lumbered with the big battery included in the 15 kg.

I am not 100% certain of that so if it is an issue i can ask.

I would like some feedback on Optional Flight Maneuvres, specifically options S & T Flight Functions.

My model has 3 types of scale automations which can be enabled:

1) Adjustable incidence horizontal stab. LE jack screw, TE hinge, etc

2) Fare tube. Launched out the side of the fuse.

3) Front windows which go down.

Would any of these qualify as options S&T Flight Functions should I decide to enable them?

1) Adjustable incidence horizontal stab. LE jack screw, TE hinge, etc
2) FLare tube. Launched out the side of the fuse.
3) Front windows which go down.

Hmm, pushing your luck there.......... LE jack screw, they could not see it in flight so that wont do.

Same for winding the windows down!

There used to be a leaflet drop option where the pilot threw leaflets overboard but i think it got zeroed when everybody started doing it.

Anyway I will ask......

No. the opinion of our leading FAI judge is non of those will get you a good mark.

Even retracts and flaps demonstration are now considered too easy.

Stick to what your aircraft would do if it was in an air-show and on the list of options.

Now this is just my opinion, I used to arrive on the static judges table with the Swordfish wings folded then make a song and dance of unfolding them. Not saying it would get you extra marks but ........