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#Post#: 4022--------------------------------------------------
Re: Diy75 Re-Build
By: nessprojects Date: July 30, 2014, 5:51 pm
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@ Otis
I would have seen about 3-5 watts in the same conditions using
the old magnets but now it is not getting into lift mode so I do
suspect that I can get more from it once the buck system is up
and running.
@Sut
The coils were wound to suit these round magnets on a 1" former.
The original magnets were 10mm thick which are the same as the
new ones. The new magnets now overlap the coils quite a bit but
it is only a test turbine anyway.
#Post#: 4027--------------------------------------------------
Re: Diy75 Re-Build
By: nessprojects Date: July 30, 2014, 7:07 pm
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@cg
I hope so, I don't expect anything less than prefect. ::)
#Post#: 4078--------------------------------------------------
Re: Diy75 Re-Build
By: nessprojects Date: August 6, 2014, 5:05 pm
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Remember I cut this turbine down in diameter well now I need it
larger in diameter due to the larger magnets.....Any ideas
guys.....I know I will not separate the blades from the rotor
due to the glue so my only thought was to cut each of the rotor
arm off and re-attach them to another central disk and shoot for
a 53% solidity.
The reason for all this modification is that we just had a
30+mph wind and it just would not go above about 8W. I think it
is down to the solidity being way out. The RPM was way down too.
Remember this turbine is just a test system and don't expect the
blades to last long anyway.
#Post#: 4080--------------------------------------------------
Re: Diy75 Re-Build
By: sut Date: August 6, 2014, 6:03 pm
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That's what I would do! then use 3 bolts to attach the wing
rotor to the main rotor, if your not worried try using some
aluminum channel on both sides of the rotor and leave the center
open where you cut the wing off . That way if you want you could
just open the gap in between the rotor and wing rotor to many
different sizes to see what works best .
#Post#: 4081--------------------------------------------------
Re: Diy75 Re-Build
By: nessprojects Date: August 6, 2014, 6:23 pm
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@Sut
aluminium channel is a great idea....Just don't have any.
I think I will end up bolting as you say, I trust Lynx in his
solidity checks but even bolting, it could still be moved.
You live and learn by your own mistakes !.
#Post#: 4127--------------------------------------------------
Re: Diy75 Re-Build
By: nessprojects Date: August 11, 2014, 10:28 am
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The tail end of Hurricane Bertha swept across us in the night
and although we did not get the brunt it did get my
re-build......The turbine kind of survived it until the
aluminium pole broke then it was a case of "Its not the falling
its the sudden stopping at the end that hurts".
Back to the drawing board I feel.
37mph...gusting 55mph is the official figures from the met
office for my area.
#Post#: 4129--------------------------------------------------
Re: Diy75 Re-Build
By: nessprojects Date: August 11, 2014, 2:23 pm
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Ha Ha.....I think steel is the better than using aluminium
poles, Steel will have a better chance of just bending before it
breaks.
Aluminium reminds me of asbestos roofs.....It don't give you any
warning, It just gives way and breaks.
I think vibration has had a big play in this failure too.
#Post#: 4132--------------------------------------------------
Re: Diy75 Re-Build
By: sut Date: August 11, 2014, 5:16 pm
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Third time is the charm on that windmill !!! Someone does not
want you to have it up on a pole
#Post#: 4137--------------------------------------------------
Re: Diy75 Re-Build
By: Cartichoke Date: August 12, 2014, 2:13 am
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Ok, I know I'm really really late to the game here and I may be
completely ignoring the design rationale for the DIY 75 but
could you add a second central disk spreading them toward the
top and bottom of the blades? The "stability" disk could have a
ring bearing around the shaft and the main rotor (I suspect the
lower one?) would house the generating hardware.
The secondary rotor need not serve any function except stability
and it would greatly reduce the strain on the main rotor with
all it hardware. I know it would increase the weight but
perhaps they would not necessarily need to be as heavy as a
single disk.
I suspect it's just not as easy as it sounds though.
Fascinating guys. Thanks for the pics. Some day, I'll make
something other than a single LED and joule thief from a cfl
toroid! HA! Something to do with rain... lol
#Post#: 4142--------------------------------------------------
Re: Diy75 Re-Build
By: sut Date: August 12, 2014, 8:03 am
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Still with this size of windmill I am surprised it broke the
mast aluminum or not ! you must get some nasty winds . What are
you going to do when you get the 175 on the pole its 2 times
bigger ? if not 3 times compared to that one that broke the mast
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