Thanks for the words of appreciation. My project was too heavy. The engines were running at the breaking point. The construction of my mower gave me a lot of new knowledge and skills, which I will use in another project. I figured the mower should be lighter and more agile. That's why I finally changed the casing. The current version of the mower mows 4.5 hours before the battery is discharged. It would have been impossible with the previous project.