Minn Kota Riptide Instinct QUEST: Which Shaft Length Is Right for Your Boat?
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Choosing the right shaft length is the single most important decision you'll make when buying a Minn Kota Riptide Instinct QUEST. Get it right and the motor performs flawlessly. Get it wrong and you'll deal with prop ventilation, erratic Spot-Lock performance, and a motor that can't do its job in the conditions you actually fish.
This guide covers everything you need to know — how to measure correctly, which shaft matches which boat, and how to avoid the most common shaft length mistake offshore anglers make.
Why Shaft Length Matters More on the Instinct QUEST
The Instinct QUEST is built for large offshore vessels — center consoles, sportfishers, and coastal cruisers with elevated bow profiles. These boats have significantly more bow height above the waterline than a typical bay boat or flats skiff, which means the shaft length requirements are more demanding.
When the shaft is too short on an offshore vessel:
- The propeller ventilates (pulls air) when the bow rises in chop or swell
- Thrust drops dramatically — sometimes to near zero
- Spot-Lock loses effectiveness because the motor can't maintain consistent thrust
- Steering becomes erratic in following seas
- The motor works harder, reducing battery runtime
On a large offshore center console in Gulf or Atlantic conditions, a shaft that is even 12" too short can make the Instinct QUEST nearly unusable in the conditions it was designed for.
How to Measure Your Bow Height
Shaft length is determined by your bow height above the waterline — not your boat's overall length, beam, or any other measurement. Two boats of the same length can have dramatically different bow heights depending on hull design.
How to measure correctly:
- Put your boat in the water at normal fishing load (fuel, gear, people)
- Measure the vertical distance from the waterline to the top of the bow where the trolling motor mounts
- Add 20 inches to that measurement
- That is your minimum recommended shaft length
Example: If your bow height is 52 inches above the waterline, your minimum shaft length is 72 inches. The 72" Instinct QUEST is your starting point — and if you fish in rough conditions or offshore swell, the 87" is the safer choice.
When in doubt, go longer. A shaft that is slightly too long is far less problematic than one that is too short. A longer shaft may require slightly more care when deploying in very shallow water, but it will never ventilate in offshore conditions.
Instinct QUEST Shaft Length Comparison
| Shaft Length | Bow Height Range | Recommended Boat Size | Best For |
|---|---|---|---|
| 60" | Up to 40" bow height | 18–22 ft | Larger bay boats, inshore center consoles, nearshore fishing in moderate conditions |
| 72" | 40–52" bow height | 20–26 ft | Mid-size center consoles, offshore-capable bay boats, coastal and nearshore fishing |
| 87" | 52–67" bow height | 24–30 ft | Large offshore center consoles, sportfishers, Gulf and Atlantic fishing in demanding conditions |
| 100" | 67"+ bow height | 26–35 ft | Very large center consoles, sportfishers, pilothouse boats, catamarans, extreme offshore conditions |
The 60" Shaft — Instinct QUEST for Larger Bay Boats
The 60" shaft is the entry point to the Instinct QUEST lineup. It's designed for larger bay boats and inshore center consoles with moderate bow heights — typically vessels in the 18–22 foot range fishing nearshore and coastal waters.
If you're running a larger bay boat with an elevated bow and fishing primarily in protected or nearshore waters, the 60" provides adequate depth for most inshore applications. It's not the right choice for open-ocean fishing or vessels with high bow profiles.
Best for: Larger bay boats, inshore center consoles, nearshore fishing in moderate conditions, anglers who primarily fish protected waters.
Not recommended for: Open-ocean fishing, vessels with bow heights above 40", rough offshore conditions.
→ Shop the Instinct QUEST 90/115 — 60" Shaft
The 72" Shaft — The Most Versatile Instinct QUEST Configuration
The 72" shaft is the most popular configuration in the Instinct QUEST lineup and covers the widest range of mid-size saltwater vessels. If you're running a 20–26 foot center console and fishing nearshore to coastal offshore waters, the 72" is the recommended starting point.
It provides enough depth to handle moderate offshore chop and swell while remaining practical on vessels that don't have extreme bow heights. For most buyers in this size range, the 72" is the correct choice — unless you regularly fish in significant swell or your bow height measurement puts you at the upper end of the range.
Best for: Mid-size center consoles (20–26 ft), offshore-capable bay boats, coastal and nearshore fishing, anglers who fish a mix of protected and open water.
Consider the 87" instead if: Your bow height is above 52", you regularly fish in significant offshore swell, or you run a heavier vessel that sits lower in the water at load.
→ Shop the Instinct QUEST 90/115 — 72" Shaft
The 87" Shaft — Built for Serious Offshore Fishing
The 87" shaft is purpose-built for large offshore center consoles and sportfishing vessels where bow height is significant and sea conditions are demanding. If you're running a 24–30 foot center console and fishing the Gulf, Atlantic, or any open-ocean environment, the 87" is the minimum recommended shaft for reliable performance.
At 87", the Instinct QUEST keeps the propeller submerged in offshore chop and swell where shorter shafts ventilate. Spot-Lock performance remains consistent in current and swell. The motor can do its job in the conditions it was designed for.
The 87" is available in both White and Black finishes — identical performance, different aesthetics. The black finish is popular with tournament anglers and offshore fishermen who prefer a stealth profile.
Best for: Large offshore center consoles (24–30 ft), sportfishers, Gulf and Atlantic fishing, anglers who regularly fish in demanding offshore conditions.
Consider the 100" instead if: Your bow height is above 67", you run a very large or heavy vessel, or you fish in extreme offshore conditions with significant swell.
→ Shop the Instinct QUEST 90/115 — 87" Shaft (White)
→ Shop the Instinct QUEST 90/115 — 87" Shaft (Black)
The 100" Shaft — Maximum Depth for the Largest Offshore Vessels
The 100" shaft is the longest configuration in the Instinct QUEST lineup and is engineered for the largest offshore vessels — very large center consoles, sportfishers, pilothouse boats, and catamarans where bow height is extreme and sea conditions demand maximum shaft depth.
If your bow height measurement puts you above 67", or if you regularly fish in open-ocean conditions with significant swell on a large vessel, the 100" is the correct choice. It is a specialized configuration — not every angler needs it — but for the boats it's designed for, it's the only shaft that delivers reliable Instinct QUEST performance.
Best for: Very large center consoles (26–35 ft), sportfishers, pilothouse boats, catamarans, extreme offshore conditions, vessels with very high bow profiles.
→ Shop the Instinct QUEST 90/115 — 100" Shaft (Black)
Common Shaft Length Mistakes to Avoid
Mistake 1: Choosing shaft length based on boat length instead of bow height. Boat length is not a reliable indicator of bow height. A 24-foot center console can have a dramatically different bow height than another 24-foot center console depending on hull design. Always measure bow height.
Mistake 2: Choosing the shorter shaft to save money. The price difference between shaft lengths is small relative to the total cost of the motor. Choosing a shaft that is too short for your vessel is a false economy — you'll end up with a motor that can't perform in the conditions you fish.
Mistake 3: Measuring at the dock without load. Your boat sits lower in the water at fishing load — fuel, gear, coolers, and crew. Always measure with the boat loaded as it would be when fishing. A boat that measures 48" at the bow empty may measure 44" at full load, which changes the shaft length recommendation.
Mistake 4: Not accounting for offshore conditions. If you fish in open-ocean conditions with significant swell, size up. A shaft that is adequate in calm water may ventilate in 3–4 foot offshore chop. When fishing offshore, err on the side of more shaft depth.
Voltage and Battery Pairing by Shaft Length
The Instinct QUEST 90/115 is a dual-voltage platform: 90 lbs of thrust on 24V, 115 lbs on 36V. Here's how we recommend pairing voltage with shaft length:
- 60" and 72" shafts: 24V (90 lb) is sufficient for most applications in this size range. 36V is an option if you want maximum thrust or fish in demanding conditions.
- 87" and 100" shafts: 36V (115 lb) is strongly recommended. At these shaft lengths, you're running a large offshore vessel in demanding conditions — maximum thrust is the right choice.
Read our complete 24V vs. 36V vs. Dual-Voltage QUEST guide →
Still Not Sure Which Shaft Length You Need?
Tell us your boat model, length, and bow height measurement — we'll confirm the right shaft length for your exact setup. We're trolling motor specialists, and this is exactly the kind of recommendation we make every day.
You can also browse all Instinct QUEST configurations on our Instinct QUEST collection page or read the Complete Instinct QUEST Buyer's Guide for a full overview of the lineup.