|
frotter
|
 |
« Reply #405 on: March 02, 2008, 12:07:34 AM » |
|
Yeah - shouldnt be allowed. Wheres yer risk assessment, fatboy? Wot about Elfin safety regs? etc....
Bed now......
ta ta!
|
|
|
|
|
Logged
|
HE WHO CONTROLS THE LARD - CONTROLS THE UNIVERSE!! Its me, incidentally..
|
|
|
|
stephen
Guest
|
|
« Reply #406 on: March 02, 2008, 12:10:30 AM » |
|
I know I said you had nothing left to tinker with, but this is extreme.
Windy again tonight. Better strap that windsave down to the chimney tonight.
Stephen
|
|
|
|
|
Logged
|
|
|
|
|
Bob
|
|
« Reply #407 on: March 02, 2008, 06:57:37 AM » |
|
Ye Gods Frott
Bad luck, just lucky nobody caught the missing blade. I would have been distraught. Maybe Chinese 8.8's should be classified 7.8?
|
|
|
|
|
Logged
|
It's not what you make, it's what you use that counts!
|
|
|
|
KenB
|
|
« Reply #408 on: March 02, 2008, 08:07:13 AM » |
|
Frot,
Sorry to hear about your loss.
Losing one blade would leave the remaining pair so out of balance that they would literally shake the whole structure to pieces. Its not the bit that flies off that does the damage, it's what's left behind.
Your first photo of the blade housing, shows that the actual casting/fabrication has cracked.
Ken
|
|
|
|
|
Logged
|
|
|
|
|
Bill H
|
|
« Reply #409 on: March 02, 2008, 09:06:04 AM » |
|
Frot,
destruction on a shocking, even epic, scale.
Commiserations.
"A true man is one who overcomes the ups and downs of life with fortitude. One should not recoil before reverses of fortunes. One should bravely face them and overcome them.”
Onward and Upwards !
Bill
|
|
|
|
|
Logged
|
The only safe place for a fusion reactor is 93 million miles away.
|
|
|
|
chaso
|
|
« Reply #410 on: March 02, 2008, 09:23:23 AM » |
|
HI Frot,
Just curious can you have a look at the slip-rings for any sine of damage.
By looking at the carnage it looks like there was no load on the turbine and it over-spun.
Charles
|
|
|
|
|
Logged
|
|
|
|
|
frotter
|
|
« Reply #411 on: March 02, 2008, 06:07:22 PM » |
|
Heh! - thanks for all comments.... We will, of course, be having a 'look in' at the slip rings etc. But say it did runaway off load, are these not supposed to furl anyway to save doom..? Ivan? Before dismantlage i will measure from Chernobyl to see if the line is open circuit..... Updates later - third blade still not found....  X |
|
|
|
|
Logged
|
HE WHO CONTROLS THE LARD - CONTROLS THE UNIVERSE!! Its me, incidentally..
|
|
|
Panda_Badger
Full Member
 Offline
Posts: 104
Spring Panda
|
|
« Reply #412 on: March 02, 2008, 07:51:28 PM » |
|
Frotts, what a mess, glad you are all ok. Nice to read you are keeping a stiff whatsaname,...... er upper lip that's it.  Glad to know that your erection skills remain un-tarnished.  Does this mean it's the giant frotty hamster wheel of power for Stoveboy for the next week? At least you've got all that LARD to be going on with, (unless the wind's nicked that).  All the best and good luck with the rebuild. The Panda. |
|
|
|
|
Logged
|
Row, row, row yer boat gently down the stream......
|
|
|
|
frotter
|
|
« Reply #413 on: March 02, 2008, 08:41:41 PM » |
|
Cheers, bud! I am leaning towards rebuilding it with shorter blades, if they are available. Less output but hopefully less doom too! I am hoping Ivan may have some input on this at some point.. words of wisdom etc... I am wondering if the 500w hub and blades will fit the shaft. If so do Nav have any in stock? Incidentally we are leaning toward bolt failure as our first cause of doom. This is the hub where the wirecutter blade lived - bolts sheared, plate gone nout left...  As you can see here, the other blades are still clamped in - just flung away from the centre.  Evidently special bolts were used made of that quality metal that BL used to make Morris Minor door handles out of... So we walked right up onto the hill with binocs today to go blade spotting....... can you see it..?  Nope, neither could we! Anyone know if the 500watt hub fits the 1kw then...?  X |
|
|
|
|
Logged
|
HE WHO CONTROLS THE LARD - CONTROLS THE UNIVERSE!! Its me, incidentally..
|
|
|
|
Eleanor
|
|
« Reply #414 on: March 02, 2008, 10:38:03 PM » |
|
So we walked right up onto the hill with binocs today to go blade spotting....... can you see it..?
No, but one of those cows looks surprised |
|
|
|
|
Logged
|
I'm doing this for free, please be nice to me  "Very few batteries die a natural death ... most are murdered"  |
|
|
|
Ivan
Guest
|
|
« Reply #415 on: March 02, 2008, 10:41:04 PM » |
|
Must've been some severe wind to cause the bolts to shear. Have you checked the continuity in case you've got an open-circuit alternator, perhaps leading to over-spinning and high centrifugal forces, as suggested by chaosman? Furling protects against high average wind speeds. It can't react fast enough to protect against sudden gusts, and certainly can't do anything about overspinning due to lack of load - you can overspin in relatively light winds if you don't have any load.
Give the office a call, should be able to sort out the replacement parts you need. I think we have some shorter blades that will fit the 1kw hub - John at Navitron should be able to tell you. You can't fit a 500W hub, as far as I know, as the shaft size is smaller.
|
|
|
|
|
Logged
|
|
|
|
stoveboy
Newbie
Offline
Posts: 7
|
|
« Reply #416 on: March 02, 2008, 10:42:52 PM » |
|
Ive just realised there is a huge tyre pile next door! I never knew that before, whats it doing there??
|
|
|
|
|
Logged
|
|
|
|
|
SteveH
|
|
« Reply #417 on: March 02, 2008, 10:47:45 PM » |
|
Thats a Sillage Clamp... A big pile of bovine Sourecroute, with a plastic sheet over it to keep it nice & pickly... The tyres are to stop the plastic sheet from blowing away... |
|
|
|
|
Logged
|
Preveli, South Crete.
|
|
|
|
northern installer
|
|
« Reply #418 on: March 02, 2008, 10:49:23 PM » |
|
Hi Stoveboy,its keeping the cows breakfast nice and fresh...mmmmmm dont you just love the smell of silage on a frosty morning |
|
|
|
|
Logged
|
"government scrappage scheme still available on Tardis trade ins (dont ask how we get around the deadline...)"
|
|
|
|
SteveH
|
|
« Reply #419 on: March 02, 2008, 11:03:01 PM » |
|
This is the hub where the wirecutter blade lived - bolts sheared, plate gone nout left... That cast hub assembly is a tad brittle then Frot... Cast Iron...? The flexing of the blades from root to tip, under the buffeting changes in wind pressure, seems to have snapped out the two bits of casting, as thats were the most force from flexing would be... The holes are close to the edge of the casting too... A quick fix to prevent catastrofic failer in future (Still think Cast is too brittle for that job, mind) might be to sandwich the rotor to blade mounting point, with a thin metal plate at the back like the one in front... then even if the casting gives the bolt is less likley to pull through... Just ramblings... Off to finish me drink... |
|
|
|
|
Logged
|
Preveli, South Crete.
|
|
|
|
