NASA Marine Paddle Log Impeller Unit 7m Cable No Skin Fitting
523-UNDERWATER
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NASA Marine Paddle Log Impeller Unit
Genuine NASA Marine Accessory | UNDERWATER
A genuine NASA Marine replacement paddle-log impeller insert supplied with an attached 7 metre cable. This version is the underwater/impeller unit only and reuses a compatible NASA paddle-log skin fitting.
Key Features
- ✔ Complete replacement paddlewheel/impeller insert
- ✔ Attached 7 m / approx. 23 ft cable
- ✔ For compatible NASA Marine paddle-log installations
- ✔ Removable insert permits servicing and cleaning
- ✔ Reuses the correct existing NASA skin fitting
- ✔ Genuine NASA Marine spare part
Technical Specs
| Part type | Paddle-log impeller / underwater insert |
| Cable length | 7 m / approx. 23 ft |
| Sensor type | Mechanical paddlewheel pulse sensor |
| Skin fitting | Not included |
| Display | Not included |
| 4Boats SKU | 523-UNDERWATER |
| NASA reference | Impellor unit without skin fitting |
Compatibility / Fitment Guide
Compatible system type: NASA Marine traditional through-hull paddlewheel log installations, including compatible Clipper Log/Clipper Duet, Target Log and Cruiser Log systems that use the same NASA paddle-log insert and pulse input.
Existing skin fitting: this listing does not include the through-hull housing. Confirm the current fitting accepts the NASA paddle-log insert and that its O-rings, cap threads and bore are undamaged. A separate NASA skin fitting is available if a complete new through-hull installation is required.
Not compatible: the EML-2/EML-3 electromagnetic transducer is a different sensor system. Raymarine or other-brand housings are not confirmed even if the outside appearance is similar.
Installation safety: removing an underwater insert while afloat can admit a significant volume of water. Follow the vessel and NASA procedures, use the correct blanking cap and service the O-rings.
Part Number Cross Reference
| 4Boats SKU | 523-UNDERWATER |
| NASA product | Paddle Log Impellor unit without skin fitting |
| Cable | 7 metre attached lead |
| Related complete part | NASA Complete Paddle Wheel Unit with skin fitting |
| Related housing | NASA Paddle Log skin fitting |
Frequently Asked Questions
Is the skin fitting included?
No. This version is the impeller insert and 7 m cable only.
Which NASA displays use it?
Compatible traditional paddlewheel versions of the Clipper, Target and Cruiser logs; confirm the existing insert and input before ordering.
Will it replace an EML-3 sensor?
No. EML-3 is an electromagnetic transducer and data-box system.
Can it be changed while the boat is afloat?
Only by following the correct procedure with a serviceable blanking cap; removing a through-hull insert can allow rapid water ingress.
Confirm the instrument version and part number before ordering. Follow the NASA Marine installation instructions and isolate vessel power before electrical work.
For the products under £150 the shipping is £6.99.
Free delivery for most items over £150.
