Well…. the documentation says:
"Maintenance
Always replace the flexshaft when it is damaged or shows visible wear or injury and property damage may result. Lubricating the flexshaft is vital to the life of the drivetrain. The lubricant also acts as a water seal, keeping water from entering the hull through the stuffing box. Lubricate the flexshaft, propeller shaft and all moving parts after every 2–3 hours of operation. Always replace any parts that show visible wear or damage.
1. Loosen the coupling between the motor and the flexshaft.
2. Loosen the setscrew from the flexshaft and remove the flexshaft from the back of the boat. Tip: Use paper or cloth to touch the flexshaft.
3. Remove the drive shaft by sliding it out of the stuffing box. Wipe lubricant and material from the flexshaft. Lubricate the full length of the flexshaft assembly up to the drive dog using marine grease.
4. Apply threadlock to the coupling setscrew. Threadlock will help prevent the flexshaft from loosening during use.
5. Carefully reinstall the drive shaft, ensuring that there is a 1–2mm gap between the prop strut and the drive dog to allow for flexshaft shrinkage under load."
and
Check lists
…
After Boating
…..
• Lubricate the flex shaft
Racing boats are high performance items, and operate at the limits of their material strength. They need looking after. Of course, with just a picture showing your propeller missing, I can't be exactly sure of what has happened. Your local club colleagues will be able to inspect the boat and be much more precise with their diagnosis…were you running with 2 or 3 cells?
Edited By Dodgy Geezer on 21/08/2017 21:36:27