DC21
Member
Blade knock could be a few different things.
1. Spring tube. It could just be the spring flexing from side to side. EWP tried to fix this with any angled washer. It's mostly an aesthetic issue.
2. Hub wear. If the locating hole in the hub has worn (usually into an oval) you can get a loud knock. This needs to be addressed quickly.
3. Hub wear. If the nyoil sleeves have worn the blade can literally wobble around.
4. Blade drop. This is typical of broken, or partially weakened springs. The blade "drops" under its own weight (movement range in 10's mm).
2, 3, and particularly 4 places a lot of strain on the tie rods, and is probably the root cause of all the mk3 tie rod end failures. So far the mk4 tie rods (which I have now thankfully found a UK source) have stood up to this challenge.
Drive couplings need to be laser aligned. However, don't expect more than 2 years from the flex plates. The alignment of the generator and gearbox varies with load - so the alignment is a compromise. It is only aligned perfectly at a certain power output, out side of that it is slightly misaligned.
Brakes - my experience now is that you shouldn't expect more than one brake reshim between services, and more likely none. This does of course depend on how hard the brakes are working. If you have a lot of SD05 (grid fault) or high wind speed shut downs, that will wear your brakes out more quickly.
BR
Matthew
1. Spring tube. It could just be the spring flexing from side to side. EWP tried to fix this with any angled washer. It's mostly an aesthetic issue.
2. Hub wear. If the locating hole in the hub has worn (usually into an oval) you can get a loud knock. This needs to be addressed quickly.
3. Hub wear. If the nyoil sleeves have worn the blade can literally wobble around.
4. Blade drop. This is typical of broken, or partially weakened springs. The blade "drops" under its own weight (movement range in 10's mm).
2, 3, and particularly 4 places a lot of strain on the tie rods, and is probably the root cause of all the mk3 tie rod end failures. So far the mk4 tie rods (which I have now thankfully found a UK source) have stood up to this challenge.
Drive couplings need to be laser aligned. However, don't expect more than 2 years from the flex plates. The alignment of the generator and gearbox varies with load - so the alignment is a compromise. It is only aligned perfectly at a certain power output, out side of that it is slightly misaligned.
Brakes - my experience now is that you shouldn't expect more than one brake reshim between services, and more likely none. This does of course depend on how hard the brakes are working. If you have a lot of SD05 (grid fault) or high wind speed shut downs, that will wear your brakes out more quickly.
BR
Matthew