60 size
These are the larger size helicopters. Until recently the engine size limit for competitions was 0.6 of a cubic inch which meant that was about as high as engine capacity went. Now that this limit has been revised, engine makers such as OS and YS have started bringing out much larger engines in the 80 and 90 size. Many people have started putting these power plants in their 60 size machines. 60 size machines are popular in competitions and for people doing lots of aerobatics. However, when you crash them, they cost more than the smaller machines to fix, so people often buy the 60's once they are confident fliers. They have the brute horsepower needed for some of the aerobatics people do.

Gassers
Gassers are basically 60 size machines with petrol engines in them. The most popular petrol engine for helicopters is the Zenoah G23. Which is basically a chainsaw or weedeater engine. The benefits of these machines is that they cost so little to run in comparison to a glow helicopter. They'll often run for about 30-40 mins on a tank of gas. However, they are a bit heavier than glow helis and don't do aerobatics so well and they're expensive to buy. Repairs cost about the same as a 60 size helicopter

Which radio system?

In my opinion, it is highly important to have good quality electronics for your helicopter. You can make a sub-standard helicopter fly well with good electronics, but it's difficult to make a good helicopter fly well with sub-standard electronics. It's my opinion that you should buy the best quality electronics you can afford, then buy the helicopter afterwards. If this means settling for a slightly lesser helicopter in order to get good electronics, then so be it. I myself tried to save money on electronics and then ended up paying twice when I finally relented and purchased good electronics. Good electronics will transform your flying. They did for me. Today's R/C systems allow huge amounts of fine tuning that allow you to get on with the business of flying enjoyably. If you're fighting with sub-standard electronics you won't enjoy your flying as much.

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