Just come back in from a test on the Common Grazings land above Swordale, Isle of Lewis.
And it didn’t all go well from a structural integrity point of view.
The test was of a dual ring stack using rigid blades on the rings.
Very quickly after starting to get up to speed and power, something , possibly the transmission from the top driving ring, seems to have snapped one of the main ring tubes…
I let it keep running for a while, as it was still generating and it was interesting to observe the performance degradation. ~ 20 seconds or so later…
Quite a throw.
The turbine keeps running despite losing the tube… The driving rigid kites are set up with ~70 span outside of the ring… I suspect this may have had a strong influence on the snap as it would impart a significant moment … maybe a 60/40 in the next build… Also there’s quite a lot of flex in the blades… huge loads at the speed they were going.
Can’t wait to really chew through the data…
Thought it best to report this… a heads up (with helmets on) These tubes may need tied internally like the ones on the wings to compress and help prevent this.
Kept running the turbine for a while… More snapping later…
Bit worrying that we didn’t notice the tube was missing until long afterwards. We found it.
By the way, check out the upward bend on that white blade… Loading
& huge thanks today to Sharavan for all his help.