Radio frequency interferenc(RFI) is a serious issue for any RF device. It applies to 2.4Gig just as well. Follow the safety guidlines of 12 inches or as much as you can get. For a 30% plane with about a 50cc motor, you can use a good set of NiCad batteries without using a regulator. That regulator is a complex part and will be a source of potential failure. Get yourself a name brand set of batteries. It sounds like the other device may be a kill switch. Smart-Fly makes a good one if you want to use it. I haven't been able to upload images for weeks. One of these days RCU will get back to normal. Dan.