Tower Crane: control 4 dc motors

Beautiful sentiment. The time will come.
If I was to think anything, I would think the battery was flat. It is a 7.4 lipo showing 7.4 so I've whacked it on the charger, however, I used it to test the motors earlier and they ran like buggery. Give me a few minutes and I'll be back. Apologies to Arnie.