Slow motion for aircraft footage: touchdown, rotation and propellers

A few seconds are all it takes, and it is over: the main landing gear touches the runway, a puff of smoke rises, spoilers pop up. In real time, this moment almost gets lost in the video. Slow motion for aircraft footage makes exactly these seconds visible – the landing gear struts compressing, the nose lifting at rotation, the propeller blades glittering in the light. This guide shows you how slow motion works technically, which frame rate and shutter speed you need, how to reliably catch touchdown and rotation, and why propellers sometimes seem to stand still in slow motion.

How slow motion works: the short answer

True slow motion happens when you record at a high frame rate and play back at a low one. The camera records, for example, 100 frames per second. If you put this footage on a timeline with 25 frames per second, one real second takes four seconds in the finished video. The slowdown factor is simply the recording frame rate divided by the playback frame rate.

Many cameras handle this internally: they offer a slow-motion or high-frame-rate mode that already saves the file slowed down. Others save the footage at the real frame rate, and you slow it down in the edit. Both lead to the same result, but the second way is more flexible: you decide later whether a clip runs in real time, at half speed or four times slower.

Slowing down normal 25 or 30 fps footage afterward is not true slow motion. Either frames are shown twice and the video stutters, or the software calculates in-between frames. With even movements that works acceptably, but propellers, landing gear, smoke and spray quickly produce smeary artifacts. You will find more about formats and basic settings in the guide Video settings for aircraft footage.

Choosing a frame rate: how much slow motion do you need?

Not every moment needs maximum slowdown. Too much slow motion turns a five-second touchdown into a sluggish minute. These steps have proven themselves:

Recording frame rate	At 25 fps playback	At 30 fps playback	Good for
50 / 60 fps	2× slower	2× slower	smooth, light slowdown for taxiing shots, departures, night shots
100 / 120 fps	4× slower	4× slower	the standard for touchdown, rotation and reverse thrust
200 / 240 fps	8× slower	8× slower	very short details: tire contact, landing gear compressing, spray

Note: the pairs 50/100/200 belong to the 25 fps world, 60/120/240 to the 30 fps world. If you mix them, the factor no longer fits evenly, and the motion can look slightly irregular. It is best to pick one system and stick with it.

On many cameras and smartphones, high frame rates come at a price. Often the resolution drops, the frame gets tighter (crop), autofocus and image stabilization work in a limited way, or the recording time is capped. Check your camera’s manual to see which combinations it offers. If you are just starting out, Video gear for beginner spotters gives an overview of useful equipment.

Shutter speed: the 180-degree rule in slow motion

When filming, the 180-degree rule applies: shutter speed is about 1 divided by twice the frame rate. The name comes from the rotating sector shutter of old film cameras, which at 180 degrees of opening exposed exactly half the frame duration. Important for slow motion: what counts is the recording frame rate, not the later playback.

• 50 fps: about 1/100 s
• 100 fps: about 1/200 s
• 120 fps: about 1/250 s
• 200 fps: about 1/400 s

Shorter speeds are possible and sometimes even intended. Crisply sharp landing gear at the moment of touchdown looks impressive at 1/1000 s. The motion then looks strobe-like and harsh, though. For the typical soft slow-motion look, stay close to the rule.

Conversely, things get tight quickly in poor light. A high frame rate means a short shutter speed, so little light per frame. Under thick clouds or at dusk the ISO climbs, and the footage gets noisy. Then a step back to 50 or 60 fps is the better choice.

Touchdown in slow motion

Touchdown is the classic slow-motion subject at the airport. A lot happens here in a few seconds: the pilot flares the aircraft, the main landing gear touches the ground, the stationary tires are suddenly accelerated to rolling speed and often leave a small cloud of smoke. After that the nose wheel lowers, spoilers deploy, and on many jets the reverse thrust opens.

Choosing the right position

For touchdowns you need a view of the touchdown zone, not the threshold. Many spots look onto the approach – there you see the aircraft from below, but not touching down. Better are positions beside the runway at the height of the touchdown zone. With a light crosswind it gets especially exciting: how the aircraft is aligned just before touchdown is shown in the guide Filming crosswind landings and storms. The basic differences between landings and takeoffs as a subject are explained in Landings or takeoffs?.

Timing: start early, let it run long

The most common mistake is recording too late. The float phase can be shorter or longer than you expect – some landings touch down almost immediately, others float for a long time. So start recording as soon as the aircraft crosses the threshold, and let it run until spoilers and reverse thrust have been visible. You cut off the rest later.

Many current cameras have pre-recording: they constantly buffer a few seconds and save them along with the clip as soon as you press the button. For touchdowns that is worth its weight in gold. Whether the function is also available at a high frame rate depends on the model.

What becomes visible in slow motion

• Tire smoke: The small cloud at touchdown is barely visible in real time, but in four times slow motion it is the highlight.
• Landing gear: The struts visibly compress, and on large aircraft with several axles the bogies tilt into their rolling position.
• Spoilers and reverse thrust: The flaps on the wings rise, and with reverse thrust the cowls of the engines open.
• Wet runway: In rain, every landing becomes a fountain of spray – especially photogenic in slow motion.

Harder landings look more dramatic in slow motion than they are. Why some landings are deliberately firmer is explained in Why some landings are hard. When you publish, you should therefore avoid sensationalist titles.

Rotation in slow motion

On takeoff, rotation is the decisive moment: the aircraft reaches rotation speed, the nose lifts, and shortly after the main landing gear leaves the ground. In real time it looks unspectacular, but in slow motion you see the fuselage rise, the gear struts extend and the aircraft lose contact with the runway.

For rotation shots you need a position beside the runway roughly where the aircraft lift off. That depends heavily on type and weight: a light regional jet lifts off much earlier than a fully loaded long-haul jet. Watch a few takeoffs before you settle on your spot. Which runway is currently used for takeoffs is explained in Understanding runway direction in use at airports.

On humid days an additional effect appears: condensation can form over the wings at rotation, and visible vortices sometimes form at the flap edges. In slow motion these veils become especially easy to see. When and why this happens is described in Vortices, condensation and moisture over the wings.

Panning at a high frame rate

At rotation, the aircraft moves quickly through the frame. If you pan with it, a steady head is a must: a video tripod with a fluid head or a monopod with a tilt head smooths the movement. In slow motion, small jerks while panning are slowed down just like the aircraft and therefore stand out all the more. Tips on tripods, gimbals and stabilizers are in Steady aircraft videos.

Propellers in slow motion: standstill, creeping, reverse rotation

Turboprops like the ATR 72-600, the Dash 8-400 or the Airbus A400M are a special case in slow motion. Their propellers often seem to have a life of their own: they appear to stand still, creep slowly forward or even run backward.

Behind this is temporal aliasing, also known as the wagon-wheel effect. The camera does not record the propeller continuously but at fixed intervals. What matters is how many times per second a blade passes a certain position – that is, rpm times blade count. If this blade-pass frequency is a whole-number multiple of the frame rate, a blade sits in the same spot in every frame, and the propeller looks frozen. If it deviates slightly, the blades shift a bit from frame to frame and appear to creep slowly.

A worked example: the Dash 8-400 has six-blade propellers that run at 1,020 revolutions per minute on takeoff. That is 17 revolutions per second, so 102 blade passes per second. At 100 fps, each blade advances only about one fiftieth of the blade spacing per frame – the propeller seems almost stationary and turns leisurely. The A400M, by contrast, has eight-blade propellers that run at several rpm levels depending on the phase of flight. When the rpm changes, the effect in the video changes too.

You can use the effect creatively: an apparently stationary propeller on a taxiing turboprop looks surreal and draws attention, for example in short videos. If you want to show real rotation instead, a longer shutter speed helps: motion blur within each frame makes the blades smear instead of freezing them sharp. At high frame rates, though, this room to maneuver is small. The basics of how propellers are rendered in photos are explained in Photographing propeller aircraft.

Rolling shutter: when blades bend

A second phenomenon comes on top of aliasing. Most camera sensors read out an image line by line, not all at once. If the propeller keeps turning during this readout time, the blades appear curved, thinner on one side than on the other, or even detached from the spinner. The slower the sensor reads out, the stronger this stands out – especially on many smartphones.

Only hardware helps here: cameras with fast-reading or stacked sensors show much less distortion, and a global shutter eliminates it entirely. If your camera reduces the resolution at a high frame rate, it often reads out faster too. Try it and compare. Specifically for the phone, Shooting aircraft videos with your smartphone has more tips.

More subjects that gain in slow motion

• Reverse thrust on a wet runway: The spray whipped up behind the engines forms plumes that almost stand still in slow motion.
• Military transports: Turboprops like the Lockheed C-130 Hercules combine propeller effects with short, steep landings.
• Water and snow: Runway cleaning, de-icing or blowing snow turn into dense particle clouds in slow motion.
• Aerobatics at airshows: Smoke trails, tight formations and turning maneuvers – tips on location and schedule are in Photographing airshows.

Typical problems and solutions

Another problem is focus. In some slow-motion modes, autofocus works in a limited way or not at all. Then focus manually on the spot where the event happens – such as the touchdown zone – and work with a somewhat smaller aperture for more depth of field. Which AF modes work on moving aircraft is explained in Autofocus for aircraft.

From the spot to the edit

In the edit you adjust the tempo. In most programs you reinterpret the clip to the project frame rate or set the speed per section. How that works in free software is shown in Video editing for spotters. If you shoot in log, you will find tips on color correction in Log profiles and color grading.

For sound, keep in mind that slow motion makes the original audio unusable: slowed-down audio sounds deep and distorted. For the slow-motion sequence, either lay separately recorded real-time sound underneath or deliberately go for silence and atmosphere. What to watch for with engine sound is described in Recording engine sound, and what applies legally to music under spotting videos is covered in Music and rights in spotting videos.

What to watch out for

• Consideration at the fence: Set up tripods and monopods only where you do not obstruct anyone or block paths. Basic rules are in Proper behavior at the airport fence.
• No drone as a slow-motion camera: Drone flights near airports are strictly regulated and off limits without permission. Details in Drones at the airport.
• Battery and storage: High frame rates produce large files and drain the battery. Bring spares.
• Incidents: If you film an unusual situation, do not rush to publish the footage with speculation – tips in the article Observed an emergency landing or incident.

Conclusion

At the airport, slow motion is not an effect for every clip but a tool for the few seconds in which a lot happens: touchdown with tire smoke, the nose lifting off, reverse thrust on a wet runway. Technically you need a high recording frame rate, a suitable shutter speed and enough light. With turboprops, a physics of their own comes into play: the ratio of blade passes to frame rate decides whether the propellers stand, creep or run backward – and rolling shutter can bend them on top of that. If you understand this, you use these effects deliberately instead of leaving them to chance.