Guru
Joined: 15/07/2006
Location: AustraliaPosts: 676
| Posted: 08:47am 03 Feb 2011 |
All is well here, cyclone Yasi is passed. A little more wind at times since yesterday afternoon. Some leaves and small branches were blown off. Nothing significant. We were not in direct path.
AXFX (&F&P) was down for the potential blow. I just put the AXFX back up this afternoon. I have the 2.5m aerofoil blades on it and just did some measuring. Wind speed at ground level fluctuating between 8 & 15 km/hr while current fluctuating between 1-2 A at 48v battery nominal. It appears that these blades do not have enough torque for the AXFX.
I did have the 2.9m composite blades on to start with. It furled too soon. I checked the weight difference between the old double F&P tail and the new one. I had to add about 150g to make them the same. I added 200g to the new one, so was then 50g heavier than the old one. It still furled too soon. I added angle to furl hinge, it is now 30 degrees of vertical. Normally set at 20 degrees. It then would hold OK but would get up speed and then turn out of the wind. The tail furl stop needs to be shorter (which I have done now with the 2.5m aerofoil blades) to allow the tail to have greater resistance to the blades wanting to turn out of the wind. With the 2.9m composite blades, it possibly would be better to have the tail longer too.
I don’t know what the wind speed was, it was really up & down, but I have seen the AXFX with the 2.9m blades hit 12A, and then turn out of the wind.
Here is a picture of the AXFX with the 2.5m aerofoil blades. The sky still is the results of cyclone Yasi.
Trev @ drivebynature.com