Extra 260

I was also thinking the same as you BB about the ally box section cutting into the ply while the engine is running due to vibration. but didn't get chance to write anything down as the missus had just come back from shopping so had to go and help to bring the shopping in.

I dont have many useful thoughts nowdays 

Is that going to be enough, i was thinking bigger going back halfway on the box 

The engine sounded nice and it responded to the needle tweaks,
It looked a bit dangerous with you stood there right in line with the prop, i know it was tethered but it was still moving around   be careful out there
I still have the scar to prove it   

That's a good start. Pun intended   I would strongly suggest you devise some means of properly tethering your model before you proceed with any further engine adjustment as you are very close getting yourself a likely major visit to Hospital. That is a nice engine you have there.

The scale of the 260 vs the load-bed suggests it should be visible from quite a distance.

How many seconds will it take to traverse the available flying field?

Ah 80kph is equivalent to a rather bone-jarring drive on the Beauty Road (the seriously rutted gravel road connecting Tony to the outside world).  Any idea about how it might fly if you constrain the revs?  And what will the local raptor population make of it?

I am imagining that the 260 is going to be flying 2-3 times the altitude you normally fly the Fun Cub, perhaps to the level of the surrounding hills and your flight area grows considerably because it will be well above the tree clutter.  And you install some sort of tracking beacon so that you can locate the big beastie.