We had some kerfuffles with insurance over land mounting the LE 600 turbine so some thought was thoughted as the Navitron 300 was tried with an on board mount. Mrs B's hair got to messed with having to wear ear defenders all the time so it didn't stay long. That was a big heavy machine mind with a 2.5m diameter and it was mounted on the back edge of the wheelhouse which acted like a sound box. Boy did that make some noise.
The idea was to mount a welded metal frame to the top of the mast using a softer than normal polyurethane goo. The frame was sized to leave a 10mm gap all the way round and this was filled with goo. The cap top was filled with 20mm thick PU as this would be taking the weight of the frame, top pole and turbine, about 25kg in all.
Sections of 80mm pipe were welded to the frame, the bottom one having a capped base to take the top pole. The 48mm dia top pole was gooed into these larger pipe sections with 25mm thickness in the bottom cap to take the weight of the pole and turbine. The top and bottom mounts were held apart with 4x1 metre lengths of stainless studding. Not pretty but it's what I had.
So the vibration is minimised by the 10mm thick PU on the mount to the mast and 15mm on the pole to the mount, giving a double isolation. It works, the noise below is like a very quiet washing machine on a spin cycle. Mrs B says it's fine so it can't be bad.
The data collected so far gives an average of 582Wh/day. Early days but a goodly amount when the sun don't shine and it tends to blow more in the winter when the sun is shy.
Here is a wee vid of the sweet machine in action. The RPM and frame speed have coincided and one can see the blade flutter. A glance at the clouds shows it's blowing. This is the direction of the worst turblence but the downwind turbine seems to cope much better. There is no furling tail to bang and crash.
Here's a couple of stills of the setup. I should really have photoed the build, but, as nearly always, I forgot.
The portrait mount for the manually tracked solar array had stood up to the winds so far with 45kts as the highest gust.
This lump weighs in at nearly 100kg so a lowering mechanism utilising either pneumatics or hydraulics is being investigated. Rams for either are not that expensive.