A radio controlled sailboat is a boat that is like a model, but
can be controlled by a remote control unit that you hold in your
hand to direct the movements of the sailboat. These are quite
popular as well as radio controlled cars, helicopters etc.
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Tower Hobbies is considered the premier seller for radio
controlled model airplanes. Their website is www.towerhobbies.com/.
You can also get less expensive ones at www.hobbylobby.com.
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Radio controlled helicopters on average cost $50. One can
purchase radio controlled helicopters from online retailers like
eBay, Amazon, Model Zone and many more.
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Yes, Nitro model planes are radio controlled. All of the Nitro
planes are sold in kits that you have to put together before you
try to fly them. They also can be gas controlled.