Nokta RC40 15.5x13 DD Coil for Racer Metal Detector

The Nokta RC40 coil is compatible with the Makro Racer and Racer 2 metal detectors only. This 15.5" x 13" DD coil is specifically engineered for the Racer series and will not work with other Nokta detector models like the Simplex, Anfibio, or Multi Kruzer. The connector and coil electronics are designed exclusively for Racer detectors, so you'll need to verify your detector model before ordering. If you're running a different Nokta detector, browse our complete selection of metal detector search coils: dd, concentric, monoloop & sef upgrades to find the right coil for your model.

The RC40's larger 15.5" x 13" footprint provides greater depth on coin-sized targets compared to smaller stock coils, with even greater gains on larger cache-sized objects. The exact depth increase depends on ground mineralization, target size, and your detector settings, but the larger electromagnetic field penetrates deeper into the soil in all conditions. You'll notice the biggest depth gains in open fields and beaches where the larger coil can work without interference from dense trash. In trashy areas with multiple targets close together, the stock coil may actually outperform the RC40 because smaller coils offer better target separation.

The RC40 is fully waterproof and handles saltwater and wet sand effectively thanks to its Double D coil configuration. The DD design provides superior ground balancing in high-mineralization environments like saltwater beaches, keeping your Racer detector stable without constant retuning. You can wade into the surf and hunt the wet sand zone where many valuable targets concentrate, and the waterproof construction matches your Racer's submersible rating. The elliptical shape also helps you maneuver in wave wash and maintain better control than round coils of similar size.

The RC40 is not ideal for high-trash areas where target separation is critical. This coil excels in open spaces like fields, beaches, and parks with minimal trash, but the large 15.5" x 13" footprint picks up multiple targets simultaneously in trashy sites, making it difficult to isolate individual coins or relics. When you're hunting old homesteads, schoolyards, or urban parks with dense iron and aluminum trash, you'll get better results switching to a smaller coil in the 8-inch to 11-inch range. The RC40's strength is depth and ground coverage, not discrimination in cluttered environments.

The RC40's larger size may result in increased weight compared to smaller stock coils. The increased weight is most noticeable during extended detecting sessions. Many detectorists offset the weight by using a detector harness or adjusting their swing technique to use more body rotation and less arm movement. The depth and coverage advantages often outweigh the fatigue factor when you're hunting large open areas, but if you're planning marathon detecting sessions, consider if the extra weight fits your physical comfort level.

The RC40 ships complete with a protective coil cover and all necessary mounting hardware. The coil cover protects the coil's bottom surface from abrasion when you're detecting on rocks, gravel, or abrasive sand, extending the coil's lifespan and preventing damage to the waterproof seal. You should install the coil cover before your first hunt and replace it when it shows significant wear, as a damaged cover can expose the coil to impacts that compromise the waterproof integrity. Replacement coil covers are available separately if you need to swap a worn cover.

The RC40 can detect gold nuggets, but its effectiveness depends on nugget size and ground mineralization. The RC40's large size and DD configuration work best on larger nuggets in open goldfields where you want to cover ground quickly, but you'll struggle with sub-gram nuggets that require higher frequencies and smaller coils. If gold prospecting is your primary focus, explore Nokta metal detectors specifically designed for gold hunting, like the Gold Kruzer or Gold Finder series.

Installing the RC40 is straightforward with the included mounting hardware. First, remove your existing coil by loosening the coil mounting bolt and disconnecting the coil cable from the control box. Slide the RC40's mounting bracket onto the lower shaft, align the coil at your preferred angle, and hand-tighten the mounting bolt. Connect the coil cable to the control box connector, making sure it clicks securely into place, then route the cable along the shaft and secure it with the provided cable ties. Power on your detector and run a quick ground balance to ensure the RC40 is working correctly.

The RC40 performs best in moderately to highly mineralized ground where its Double D configuration provides superior ground balancing compared to concentric coils. This includes saltwater beaches, volcanic soils, red clay, and iron-rich farmland where concentric coils often false or require constant retuning. The DD design also excels in areas with electrical interference from power lines or buried cables, maintaining stability where other coil types struggle. You'll get the most from the RC40 in open ground with low to moderate trash density, where the large size can cover ground efficiently without picking up multiple targets simultaneously. Understanding metal detector technologies like DD versus concentric coil design helps you match the right coil to your hunting conditions.