OS Engines For RC Helicopters

Which Nitro R/C Helicopter Engine Size Is Right For Me?

There are several engine brands available in the market, but today we are going to talk about my favorite engine. The O.S. engine.

This is the most popular brand out on the market today. I’ve played around with this engine brand so I think I can pretty much talk about it.

The engine is available in various sizes with each offering its own flavor. I will just cover the most common sizes

The first type of engine is the .32-.37 cubic inches size.

The .32-.37 cubic inches size engines are designed for someone who is new to R/C helicopters.

The .32-.37 cubic inches size engines are designed to fit class 30 R/C helicopters like the Raptor or Sceadu, and as a result ideal for
someone who is new to R/C helicopters. This engine delivers a fair amount of power, while being tough and reliable. Though it’s a bit louder than some of the bigger O.S. engines types, this engine size provides a punch and will enable you to perform some acrobatic moves.

The second type of engine is the .50 cubic inches size.

The Class 50 O.S. Engines are well-suited for both beginners and somewhat more intermediate flyers.

This engine is designed for class 50 R/C helicopters. The Class 50 O.S. Engines are well-suited for both beginners and somewhat more intermediate flyers. This engine also fits the Raptor 50 and the Sceadu 50.

Though a bit more expensive than the Class 32-37s noted above, the Class .50 O.S. Engine provides a great deal of power, and more than enough juice to achieve any aerobatic move you desire. The only drawback; more power means more fuel consumption.

The third type of engine is the .61-.70 cubic inches size.

The Class O.S. Class 61-70 Engines are great for the intermediate-to-advanced flyer.

And they’re also called, of course, BIG ENGINES! Designed for any 60-class helicopter,
the O.S. Class 61-70 Engines are great for the intermediate-to-advanced flyer who knows what to do with the immense power that these engines provide.

Virtually any 3D move (e.g. inverted) can be accommodated via this power. Again, however, more power means more fuel consumption, and a bigger price tag.

The fourth type of engine is the .91cubic inch size.

The Class 90 O.S. Engines are immense and suited for the highly advanced and expert flyer.

Folks, it doesn’t get bigger than this. Designed to fit class 90 helicopters, the Class 90
O.S. Engines are immense and suited for the highly advanced and expert flyer. But I have seen people, just out of the hobby shop, using these.

Trust me, you don’t want to drop the big money on one of these engines if you aren’t sure you know how to handle it!

The rush of flying a Class 90 O.S. Engine is beyond words; and you’ll just have to try it and experience it for yourself. Be warned, however, that once you fly something with this much power, you may NEVER be able to go back to a less powerful engine!

But on a lighter note, when shopping for your O.S. Engine, have some fun and really see which one fits your current and future flying needs. Many people have several helicopters with different engine size engines; some for when they want to cruise the skies, and others for when they want some severe power to perform some crazy stunts.

Regardless of the O.S. engine type that you choose, remember that each one comes with its own flavor. But most important, you should analyze your needs – including your budget limits – before you make a purchase.