Tantrum wont be fightin at RCWars on Sunday Ewan, too busy with all the extra paperwork Ive been lumped with.

For the record by the way, as shaft sizes came up a few posts ago, Tantrum runs a 55mm thick aircraft ali shaft with 4mm titanium thrust retainer. This is in line with the expect 10% guideline on spinner supports from the FRA.

Though many current spinner come nowhere near this, I would not say that makes them unsafe.

Each robot is unique, and each solution should suit that robot. I would suggest for Ewan, as you are always trying to get so much energy in your spinners, that you have a primary support shaft of at least 10% of the disk diameter, this is to meet that expected guideline. If you had a 50mm shaft on you 500mm bar, and the motor shaft plugged in the other side, you would have pretty much the same setup as not, but its held on far better. Not too hard to do, wont compromise your robot either. If you did have this, even with a wooden chsssis Id be 90% sure of running you. Wood is underrated, remember, the Mosquito fighter bomber was wood!

spinners are a very tricky thing to convince people they are safe, if you want to make sure they minimize their critisism, maximize your mounting method.

If your robot is well built, and Im convinced the spinner will not seperate from the robot, its 90% there. The arena is more than capable of containing most spinner (featherweight) but one or two might be just the right size/shape to cause us problems.

As to the roof, again, dont make so much of it, its very close to the top of the arena, as due to feedback from the roboteers, there is now no gap. We can run verticals.