I have viewed this thread on the risk of flying the Jabiru in high temperatures with great interest. I"ve flown the Jabiru from the KFM powered onwards. I"ve flown & seen the early Jabs flown overloaded and in temperatures in excess of 40 degs on many occasions. Those same A/C have amassed around 5 to 6 thousand Hrs in less than ideal conditions ( training ). I know of none that have failed structurally in the air.
We are aware that fibre reinforced plastics and the like will reduce in strength with increase in temperature, how much depends on type of resins, fibre, vacuum, pressure, etc. I operated a crash and fibreglass repair business during the advent of the fibreglass gliders. At first it was a life of 2000 Hrs then 3000 then 4000 and so on. Those gliders are still flying after spending many Hrs above 40 deg on the deck.
On very hot days we launched taking it easy not to over load pick up a little alt, a
short while later it was back to max stength. If you"re flying an A/C that has only been max tested to 4 Gs you could be in deep S---t, 7 or 8 and you'.ve got a better safety margin. Some manufacturers don't like to talk about it. The design will have a lot to do with it, The 160, 170 and 200 series of Jabs with the rib wing design I would think would have less strength than the foam core of the 120, the internal heat of the wing would be considerably less on the foam core design. And the type of paint, that's another story.
Imagine what is trying to happen to a wing on the metal A/C we fly in RA,To keep in the weight range the metal is thin and you will see some that look like they've got a bad case of cellulite on very hot days. I wonder what is happening to the laminar flow on take off. You can hear some of them tin canning in the sun. It's no wonder some of the maufactured RA A/c are having to have rivets replaced in some skin areas after a relatively short time in service.
I'm not bagging any A/C in particular, I love any A/C I can get my bum in, after calculating the risk that is.
If you're not sure or it scares you, keep out of it or at least talk to somebody who has had experience in it. I do not suggest you fly overloaded A/C or take the risks mentioned above. It's good to see we have the extra weight now compared to earlier days, much safer. The heat! well, commonsense.:thumb_up: