One of the most common questions new spinners ask is why some spindles seem to keep going forever while others slow down almost immediately. The answer comes down to spindle momentum — and Turkish drop spindles are particularly well designed to maintain it.
Understanding why your spindle spins the way it does helps you work with it more effectively, choose the right size for your fiber, and troubleshoot problems when the spin time feels shorter than it should. This guide explains the physics behind spindle spin time and why Turkish drop spindles spin longer than many other spindle styles.
What Is Spindle Momentum?
Momentum in a spinning spindle is rotational inertia — the tendency of a spinning object to keep spinning. A heavier spindle, or one with weight distributed further from the center, carries more rotational momentum and keeps spinning longer after each flick. This is the same principle that makes a heavy flywheel keep turning longer than a light one, or why a bicycle wheel keeps spinning long after you stop pedaling.
For hand spinners, rotational momentum translates directly into drafting time. The longer the spindle keeps spinning, the more time you have to draft fiber before the spindle slows and needs to be re-spun. This is why spin time matters so much — especially for beginners who are still developing their drafting rhythm.
Why Weight Placement Matters
It's not just total weight that determines spin time — it's where that weight sits relative to the center of rotation. A spindle with weight distributed further from the shaft carries significantly more rotational inertia than a spindle of the same total weight with mass concentrated near the center. This is why two spindles of identical weight can spin for very different lengths of time depending on their design.
A top whorl spindle concentrates weight near the top of the shaft, close to the center of rotation. A bottom whorl spindle places weight lower but still in a relatively compact disc. Turkish drop spindles distribute weight across the full span of the crossed arms, which sit low on the shaft — placing mass as far from the center as possible and maximizing rotational inertia.
Why Turkish Drop Spindles Spin Longer
Turkish drop spindles have their weight distributed across the crossed arms, which sit low on the shaft. This low, wide weight placement does two things at once: it increases rotational stability by lowering the center of gravity, and it maximizes rotational inertia by placing mass far from the axis of rotation. The result is a longer, steadier spin that gives you more time to draft fiber before the spindle needs to be re-spun.
This is one of the main reasons Turkish spindles are so well suited to beginners. More spin time means more drafting time, which means less rushing and more control. Learn more about why Turkish drop spindles are perfect for beginners — longer spin time is one of the main reasons.
How the Turtle Affects Momentum
As yarn builds on the spindle arms, the growing cop adds weight and changes the weight distribution. In the early stages of a new cop, when there's very little yarn on the arms, the spindle may feel slightly less stable and lose momentum more quickly. As the turtle grows, the added weight increases rotational inertia and the spindle typically spins longer and more steadily.
This is why many spinners notice their spindle feels more satisfying to use once a good amount of yarn has built up — the physics genuinely improve as the cop grows. Consistent, even winding also helps maintain balance and prevents the wobble that can slow a spindle prematurely. Learn more about why Turkish drop spindles make center-pull yarn balls and why the winding pattern matters for spindle balance.
Spindle Size and Momentum
Heavier spindles carry more rotational momentum and spin longer. This is why spindle size selection matters so much for beginners — a spindle that's too light for the fiber being spun will lose momentum quickly, leaving the spinner with very little time to draft before needing to re-spin. A spindle that's appropriately weighted for the fiber gives a long, comfortable drafting window.
In general, heavier spindles are better suited to thicker yarn and beginners who need more drafting time, while lighter spindles are better for fine yarn and experienced spinners who draft quickly. See my guide on Turkish drop spindle sizes explained to understand how Mini, Medium, and Mega spindles differ in weight and spin time, and how to match spindle size to your fiber and skill level.
How Spin Technique Affects Momentum
The way you spin the spindle also affects how long it keeps going. A smooth, controlled spin that sets the spindle rotating evenly transfers energy efficiently and produces a long, stable spin. A sharp, jerky flick may feel like it's adding more energy, but it often introduces wobble that dissipates momentum quickly. The goal is a smooth, deliberate spin that gets the spindle rotating cleanly around its axis without wobble.
Releasing the spindle fully after spinning also matters. If you grip the shaft even slightly while the spindle is spinning, friction slows it down immediately. Let the spindle hang freely from the yarn and rotate without any contact from your hand.
Winding and Momentum
Winding yarn evenly on the arms helps maintain balance and consistent momentum throughout the cop. Yarn piled heavily on one side of the arms creates an unbalanced weight distribution that causes wobble, which dissipates momentum and shortens spin time. The over-two under-one winding pattern distributes yarn evenly across all four arm sections and keeps the spindle balanced as the cop builds. See my guide on winding yarn on a Turkish drop spindle for the correct technique.
When the Spindle Loses Momentum Too Quickly
If your spindle slows down faster than expected, the most common causes are uneven winding that creates wobble, a spindle that is too light for the fiber being spun, gripping the shaft rather than releasing it fully, or a sharp flick rather than a smooth spin. In some cases, the fiber itself is the problem — fiber that resists drafting requires more physical effort and can cause the spinner to inadvertently slow the spindle. See my guide on common Turkish drop spindle problems and how to fix them for detailed solutions.
Fiber Preparation and Spin Time
Well-prepared fiber drafts more smoothly and requires less physical effort, which means you can draft more efficiently within the spindle's spin window. Fiber that resists drafting — because it's compressed, tangled, or poorly opened — forces you to work harder and slower, which makes even a well-designed spindle feel like it's not giving you enough time. My handmade wool combs and handmade wool hackles produce aligned fiber that drafts smoothly and makes the most of every spin.
Key Takeaways
- Spindle spin time is determined by rotational inertia — heavier spindles and spindles with weight further from the center spin longer
- Turkish drop spindles distribute weight across the full span of the crossed arms, maximizing rotational inertia and spin time
- The low, wide weight placement also lowers the center of gravity, which improves stability and reduces wobble
- More spin time means more drafting time — this is one of the main reasons Turkish spindles are so beginner-friendly
- The turtle grows heavier as yarn builds, which increases rotational inertia and typically improves spin time as the cop develops
- Heavier spindles carry more momentum and are better suited to thicker yarn and beginners who need more drafting time
- A smooth, controlled spin transfers energy more efficiently than a sharp flick — and releasing the spindle fully prevents friction from slowing it prematurely
- Uneven winding creates wobble that dissipates momentum — consistent over-two under-one winding keeps the spindle balanced
- Well-prepared fiber drafts more efficiently, making better use of the available spin window
Frequently Asked Questions
Why do Turkish drop spindles spin longer than other spindles?
Turkish drop spindles spin longer because their crossed-arm design distributes weight across the full span of the arms, which sit low on the shaft. This places mass as far from the axis of rotation as possible, maximizing rotational inertia. The low weight placement also lowers the center of gravity, improving stability and reducing wobble. Both effects work together to produce a longer, steadier spin than designs that concentrate weight near the top or center of the shaft.
What is rotational inertia and why does it matter for spinning?
Rotational inertia is the tendency of a spinning object to keep spinning — the resistance to changes in rotational motion. An object with high rotational inertia requires more force to stop, which means it keeps going longer once set in motion. For hand spinners, high rotational inertia translates directly into longer spin time and more drafting time per flick. Spindle design, weight, and weight placement all affect rotational inertia.
Is a heavier spindle always better?
Not always — it depends on the fiber and yarn weight you're spinning. A heavier spindle carries more momentum and gives you more drafting time, which is helpful for beginners and for spinning thicker yarn. But a spindle that's too heavy for fine fiber will over-twist it before you can draft, producing wiry, over-spun singles. The goal is to match spindle weight to fiber weight.
Does the turtle affect how long the spindle spins?
Yes — as yarn builds on the arms, the growing cop adds weight and increases rotational inertia, which typically improves spin time as the cop develops. This is why many spinners notice their spindle feels more stable and spins longer once a good amount of yarn has built up. Consistent, even winding helps maintain balance throughout the cop and prevents the wobble that can shorten spin time.
How does spinning technique affect spin time?
Technique has a significant effect on spin time. A smooth, controlled spin transfers energy efficiently and produces a long, stable spin. A sharp, jerky flick often introduces wobble that dissipates momentum quickly. Releasing the spindle fully after spinning is also important — even slight contact with the shaft creates friction that slows the spindle immediately.
Why does wobble shorten spin time?
Wobble dissipates rotational energy by converting it into side-to-side oscillation rather than clean rotation. A spindle that wobbles spends energy on that wobble rather than spinning, so it slows down faster. Wobble is usually caused by uneven yarn distribution on the arms, a sharp flick, or too little yarn built up to balance the spindle.
How does spindle size affect spin time?
Larger, heavier spindles carry more rotational momentum and spin longer. A Mega Turkish spindle will typically spin longer than a Medium, which will spin longer than a Mini, assuming all are spun with the same technique. This is one of the reasons Mega and Medium spindles are recommended for beginners — the extra spin time gives new spinners more room to draft before needing to re-spin.
Does fiber preparation affect how long I can spin before re-spinning?
Yes, indirectly. The spindle's spin time is fixed by its physics, but how much you accomplish within that window depends on how efficiently you draft. Well-prepared fiber that flows smoothly allows you to draft quickly and make full use of the available spin time. Fiber that resists drafting — because it's compressed, tangled, or poorly opened — forces you to work harder and slower, which means you accomplish less drafting before the spindle slows. Preparing fiber with wool combs or a hackle before spinning makes a noticeable difference in how efficiently you can work within each spin cycle.
Does park and draft affect spindle momentum?
Park and draft sidesteps the momentum question entirely by stopping the spindle deliberately before drafting. Instead of trying to draft while the spindle is spinning — which requires keeping up with the spin cycle — you spin the spindle, park it against your leg, draft while it's stationary, then release the stored twist into the fiber. This means spin time becomes less critical for beginners using park and draft, because the spindle doesn't need to keep spinning while you draft. As drafting skill develops and the transition to continuous spinning happens naturally, spin time becomes more relevant again.
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