Guru
Joined: 19/05/2008
Location: AustraliaPosts: 1178
| Posted: 03:07am 10 Jul 2011 |
Geez Trev brave move given the number of posts regarding the strength requirements that exist for large diameters.
The ones I got from PhillM pre assembled have SS tube 3/4 of the full length and the solid stubs further than he recommends too at almost 1/2 the blade length.
Result is a blade that although heavy is bulletproof, so is the mounting, hence the 3m blade set probably getting close to 15KGS....
That concerned me at first but in reality makes no discrenable difference to the turbines performance and "events" of 40m/s are survivable.
PhillM's comments on the blade angles were why I chose to not use your hub as I did not have the required tooling to get the hole drilled in exactly the right spot to achieve the correct angle on every blade.
A mechanism that bolts the blades in a hub similar (to yours) with fixings achieved without drilling holes in the structural fixing of the blade (ie the solid rod) made more sense as it allows for that fine adjustment to take place and hence forces from incorrect tracking kept to the minimum possible.
Luck favours the well prepared