CoPilot

Short version: if you truly maintain altitude and heading, updrafts don’t directly change your ground speed—they mostly mess with your vertical energy and workload, not your horizontal motion.

What’s actually happening

• Groundspeed is horizontal only.

Groundspeed is the horizontal component of your motion over the earth. A vertical updraft is a wind vector pointing up, not forward or backward, so by itself it doesn’t add or subtract horizontal speed.

• Vectors make this clear.

Your motion is the sum of:

• • Horizontal airspeed vector (where the helicopter is pointed and how fast through the air), plus
  • Horizontal wind vector (headwind/tailwind/crosswind), plus
  • Vertical components (climb/descent, vertical wind).

Only the horizontal parts affect groundspeed.

• Maintaining altitude cancels the updraft.

In an updraft, the air is trying to carry you upward. If you hold altitude, you’re effectively:

• • Lowering collective or pitch to reduce your own climb tendency
  • Letting the vertical wind pass through while you stay level

That adjustment is mostly about vertical force balance, not horizontal speed.

Where pilots feel an effect

Even though groundspeed doesn’t really change from the updraft itself, you might notice:

• Airspeed wiggles:

Turbulent updrafts change angle of attack and rotor loading, which can cause small, rapid IAS changes. If you react with pitch changes, you can unintentionally alter groundspeed—but that’s your control input, not the updraft directly.

• Power and attitude changes:

In strong lift (ridge lift, thermal, wave), you may:

• • Reduce power/collective to avoid climbing
  • Slightly change pitch attitude to keep speed and altitude where you want them

Again, any groundspeed change comes from how you fly, not from the vertical wind itself.

Practical takeaway

• Pure vertical updraft + steady altitude + steady heading ≈ no direct groundspeed change.
• Any noticeable change in groundspeed in updrafts is usually:
  • From associated horizontal wind changes, or
  • From your own pitch/collective corrections while riding the bumps.

If you want, we can walk through a simple vector diagram with numbers to make this feel more concrete, like a mini ground lesson.