The first time you see a plane hang on its propeller ten feet off the grass, slowly rotating like a flag on a pole, it looks like the laws of physics took the afternoon off. They did not. A 3D plane simply has more thrust than it weighs and control surfaces big enough to steer in the propeller's blast when the wing has stopped flying. Learning to use that is the most fun you can have with a transmitter, and also a reliable way to practice repairs.
This guide covers the three foundation 3D maneuvers: the hover, the harrier and the torque roll. We start with setup, using numbers from E-flite's 4-Site 3D 800mm manual, then walk through each maneuver step by step. You should already be comfortable with takeoffs, landings and basic aerobatics before trying any of this.
The Short Answer
3D flying starts with the right plane and setup (thrust greater than weight, very large control throws and generous expo), then progresses from high-altitude hovers to harriers to torque rolls, practicing on a simulator first and always with plenty of height.
- Hover: nose straight up, throttle controls height, elevator and rudder keep it vertical, aileron stops the torque spin.
- Harrier: nose high, wings level, flying slowly forward on throttle, steering with rudder.
- Torque roll: a hover where you let the plane rotate with the prop's torque and add aileron to keep it smooth.
- Practice high, on a simulator first, then on a light foamy that bounces.
1. Setting Up a Plane for 3D
A 3D plane is not just a sport plane with the throws turned up. It needs a light airframe, a power system that can pull it straight up, and huge control surfaces. Compare the 4-Site's throws with a regular sport plane like the Sportix 1.1m, using the numbers from each manual:
| Surface | Sportix 1.1m sport plane, high rate | 4-Site 3D 800mm, low rate | 4-Site 3D 800mm, high rate |
|---|---|---|---|
| Aileron | ±20 mm | 58 mm | 88 mm (measured at root) |
| Elevator | ±30 mm | 40 mm | 58 mm (at widest point) |
| Rudder | ±50 mm | 55 mm | 85 mm (at bottom) |
| Expo | 10% | 20% | 30% |
Big throws, lots of expo
The 4-Site's high-rate throws are far larger than the sport plane's, on a plane that is smaller. That much throw makes a plane twitchy around center, which is why the manual pairs it with 30% expo on high rate and 20% on low. Expo softens the stick response near center while keeping full throw at the ends of the stick, where you need it to recover from a stall or hold a hover. The manual also says not to set rates below 50%, or AS3X+ may not work properly.
CG first
The 4-Site manual lists a CG range of 80-91 mm behind the leading edge, with 87 mm recommended, checked upright with the battery installed and the ESC not armed. Start at the recommended point. Many 3D pilots experiment with CG later, but do not start there; a misbalanced plane makes learning harder.
Stability modes
The 4-Site uses SAFE Select: SAFE mode adds angle limits and self-leveling, while AS3X+ mode gives direct stick response with gyro stabilization. 3D maneuvers need the full flight envelope, so you will fly them in AS3X+ mode. Keep SAFE on a switch for the first flights while you trim and get used to the plane.
Low rate for takeoff, high rate for 3D
The 4-Site manual says to fly the first flights on low rate (and suggests high-rate elevator for landings). Keep normal sport flying on low rate, and flip to high rate only once you are at altitude and ready to try a maneuver. Many pilots set up a third, even bigger 3D rate later; get comfortable with the manual's high rate first.
2. The Hover, Step by Step
Everything in 3D builds on the hover. The plane hangs nose-up on the propeller with the wing producing almost no lift, so you control it through the prop blast over the tail and ailerons.
How to hover
- Get high. Start at a height where you could recover from a tail slide, and always over open grass.
- Pull vertical. Fly level at a moderate speed, pull up into a vertical line and reduce throttle as the plane slows.
- Find the hover throttle. As the plane stops climbing, adjust throttle until it holds height. Up means more than needed, down means less.
- Keep the nose vertical. Use elevator to correct the nose tipping toward or away from you, and rudder for left and right.
- Stop the spin with aileron. The plane will try to roll in the opposite direction to the propeller. Hold just enough aileron to stop it.
- Exit forward. Add throttle, push gently into a dive or level off, and fly away with speed before trying again.
Why it wants to spin
A spinning propeller pushes back on the airplane with an equal and opposite torque. In normal flight the wing resists it; the FAA's takeoff chapter describes torque and P-factor pulling a full-scale airplane's nose left at low speed. In a hover the wing is not flying, so the whole plane wants to rotate the other way from the prop. Ailerons in the prop blast are what hold it still.
Throttle is your altitude stick
The biggest mental shift is that elevator no longer controls climb and descent. In the hover, only throttle does. Make small, smooth throttle changes, because a lot of throttle suddenly also adds a lot of torque, and the plane will roll.
3. The Harrier and the Torque Roll
Once you can hold a hover for a few seconds, the next two maneuvers are variations on the same skill.
The harrier
A harrier is very slow, high-angle forward flight with the nose raised steeply and the plane hanging on the prop. To enter, fly level into the wind, reduce throttle and feed in up elevator as the plane slows until the nose is high and it is barely moving forward. Then:
- Hold the nose angle with elevator.
- Control height with throttle, just like the hover.
- Steer with rudder; aileron in a harrier mainly keeps the wings level.
- Expect wing rock, where the wings rock side to side as the tips stall. Small, quick aileron corrections and a bit more throttle usually calm it.
The torque roll
A torque roll is a hover where you let the plane rotate around its vertical axis instead of stopping the spin. From a stable hover, relax some of the aileron you were holding, or add a little in the direction the torque is turning it. The plane begins to rotate while you keep it vertical with elevator and rudder and keep height with throttle. The hard part is that elevator and rudder corrections change direction as the plane rotates, so you correct based on where the nose is leaning, not which way the stick is labeled.
A practice plan
Start on a simulator such as RealFlight and practice hovers until you can hold one for 10 seconds. Next, try them on a light foam plane, like a UMX flat foamy, high and over grass. Fly short sessions; 3D is hard on batteries, and the 4-Site manual suggests a 3-minute timer for the first flight on its 850mAh pack. Bring the plane down lower only as your hovers become consistent.
Fly it safely
Hovering low and close is where 3D gets dangerous. Follow the AMA's safety code: use a safety line between flying and spectators, avoid flying directly over unprotected people, moving vehicles and occupied structures, and keep powered models at least 25 feet from anyone except you and your helpers, outside of takeoff and landing.
Conclusion
3D flying is a ladder. Set up a light plane with big throws, plenty of expo and a correct CG. Learn the hover first, high and on a simulator, until throttle-for-height becomes automatic. The harrier and torque roll then build on that same skill. Practice in short sessions, keep plenty of height until your hovers are solid, and expect to repair a little foam along the way.
Want help setting up rates and expo for your first 3D plane? Stop by our Cumming showroom, browse our 3D and aerobatic planes, or contact the flight desk.
Gear Mentioned in This Guide
E-flite 4-Site 3D 800mm BNF Basic
Small, light 3D plane with AS3X+ and SAFE Select; this guide's throws and CG numbers come from its manual.
Shop now
E-flite Eratix 3D SWS 1.6m BNF Basic
A 64-inch 3D airframe: bigger planes hover more slowly and are easier to read.
Shop now
E-flite UMX Eratix 3D FF 450mm BNF Basic
Micro flat-foamy for practicing hovers in a small field.
Shop now
RealFlight Evolution with InterLink DX
Crash a hundred hovers for free before you try one for real.
Shop nowFrequently Asked Questions
What makes an RC plane capable of 3D?
Thrust greater than its weight, a light airframe and very large control surfaces with lots of throw. That combination lets it hang on the propeller and steer in the prop blast when the wing is not flying.
Should I learn 3D on a simulator first?
Yes. Hovering and torque rolls take many attempts, and a simulator lets you practice them without repairs. Move to a light foam plane once you can hold a hover consistently on the simulator.
Why does my plane roll when I try to hover?
Propeller torque. With the wing not flying, the plane wants to rotate opposite the propeller. Hold a little aileron to stop it, and change throttle smoothly, since big throttle changes add big torque changes.
What is the difference between a harrier and a hover?
In a hover the nose points straight up and the plane holds still. In a harrier the nose is high but not vertical and the plane moves slowly forward, with throttle controlling height and rudder steering.
How much expo should I use for 3D?
Start with your manual's numbers. The E-flite 4-Site manual recommends 30% expo on high rate and 20% on low rate for aileron, elevator and rudder.
Can I fly 3D with SAFE turned on?
Generally no. SAFE modes limit bank and pitch angles. Fly 3D in AS3X or another rate mode that gives you the full flight envelope.
