Paul Tradelius’s Blog

Ground effect: is it real?

Jun 09, 2014 5 Comments by

When a helicopter is hovering at a height that’s approximately less than the diameter of one rotor disc, it really does encounter “ground effect.” This is because the downwash velocity created by the rotor blades can’t be fully developed because the helicopter is so close to the ground, so the helicopter rests on a “bubble” [...]

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May 27, 2014 No Comments by

Starting with the throttle, let’s first take a look at the servo. There are those pilots who believe the throttle servo should be just as fast and powerful as those used on the swashplate so rapid throttle changes can be made for 3D flying. However, I am not of this belief for the following reasons. [...]

Helicopters, Paul Tradelius Read more

Futaba T10J Radio

May 12, 2014 1 Comment by

The T10J radio is the latest from Futaba and features a full 10 channels with 30 model memory, and is fully programmable and updateable by the user. Real time telemetry data for transmitter and onboard voltage, temperature, RPM and GPS location can be viewed on the backlit LCD screen, and audibly reported through headphones when [...]

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The Nine Eagles Solo Pro 290 Lama Helicopter

May 09, 2014 No Comments by

The Nine Eagles Solo Pro 290 Lama from Tower Hobbies is a highly detailed, and ready to fly, replica of the Aérospatiale SA-315 Lama, a French utility helicopter for both civilian and military uses. Available in both a ready-to-fly and TR (Transmitter-Ready) version, great care was taken to recreate many of the full-scale features, such [...]

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Gas O.S. Engine Revisited

Apr 23, 2014 1 Comment by

Until now, gas engines have not been designed for RC helicopter use, and have therefore they have been almost impossible to mount in a helicopter. And they have not come with the needed muffler system to extract maximum power, and they produced a lot of vibration because they were unbalanced. The folks at O.S. have [...]

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First-Flight Checklist

Apr 01, 2014 No Comments by

• Initial test flights should be limited to hovering and very mild maneuvering. During this time check for proper blade tracking and any signs of vibration. Minor changes to the control linkages will bring the blades in track. Foam in the fuel tank could be an indication of an engine misalignment, while vibration in the [...]

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Pro Hovering Tips & Tricks

Feb 05, 2014 2 Comments

One of the problems very common in hovering (as well as when learning to fly formation in full-scale airplanes) is that the pilot does not notice the need for a correction until the helicopter has moved, and then an over-correction is required. As an example, let’s compare two identical helicopters in a hover: one flown [...]

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Curtis Youngblood’s Aerobatic Stingray

Dec 12, 2013 No Comments

Quad copters have always been known for their stability as an in-flight camera platform, but have lacked aerobatic capabilities because of their fixed pitch rotor system. However, Curtis Youngblood has changed all that with his new Stingray fully aerobatic Quad Copter with collective pitch. I was fortunate to see this fly at the Orlando Heli [...]

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About the author

A regular contributor to Model Airplane News, he is also the columnist for our “Rotor Speed” helicopter column. Paul has been flying RC helicopters since the early ‘80s and now enjoys all types of rotary machines, including scale and aerobatics, and he continues to experiment with modifications to improve performance.
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