Again this is an old topic on this list, but I recall studies indicating an exponent somewhere between 2 and 3 for cost increase versus diameter for...
31000
Geoff Thomas
windlad2003
Jun 11, 2013 2:25 am
For several large turbines I have had to research, one does conspicuously better by buying one 2 Meg rather than two 1 Meg, - From the same company! - mainly,...
31001
Michael
mmk_tsm
Jun 15, 2013 3:31 am
Guys, this is a very discouraging thread, very negative in spirit. Can we not concentrate on what is needed to make small wind viable. I honestly believe it...
31002
nando37
mhp_moderator
Jun 15, 2013 6:35 pm
MICHAEL: The first step is to define the size of the turbine and the power desired then from there proceed to determine the true parameters to make a stout...
31003
Doug
dougselsam
Jun 15, 2013 6:36 pm
OK how's this for a positive: I have a model developed and tested now for years at the most punishing test sites I could find. We have not seen any kind of...
31004
Laurie Forbes
laf@...
Jun 16, 2013 1:58 am
... Why order one when you can easily make your own using simple tools (cut-off saw, stick welder and drill press)? I have one on a 12 footer that's been up...
31005
Croombs
deniscroombs
Jun 16, 2013 2:32 pm
Hi Do you have any drawings/sketch's or phones that I can use to copy your design ? I would love to build one but cannot find a good example to copy. Rgds ...
31006
Doug
dougselsam
Jun 17, 2013 12:59 am
Not true: If it makes high power, it is NOT fully furled. Adjust the geometry until it does NOT make high power. Nando wrote: > furling, ... allows the wind...
31007
Laurie Forbes
laf@...
Jun 17, 2013 1:10 am
Hi, don't have any drawings but have attached an image that explains it fairly well. The shafts are 1" cold rolled steel, the bearings are 1" pillowblocks and...
31008
Michael
mmk_tsm
Jun 17, 2013 1:10 am
Laurie, I second what Denis said. Let's see the details. And I think he wanted photos :) But I would go further, not all of us are good in work shop, it...
31009
Geoff Thomas
windlad2003
Jun 17, 2013 1:10 am
There are designs in the SWH archives I recall seeing, you would have to search. Geoff Thomas. ... [Non-text portions of this message have been removed]...
31010
Laurie Forbes
laf@...
Jun 17, 2013 3:36 am
... Tried to send a photo as an attachment to my previous reply but it looks like it (the attachment) didn't make it. Is there some other (easy) way of doing...
31011
jon powers
calwind@...
Jun 17, 2013 5:08 pm
... As RPM increases, the flyweights move forwards (or upwards as shown on the image) thus decreasing the blade pitch to go towards stall at max speed. Note...
31012
Doug
dougselsam
Jun 17, 2013 7:11 pm
Laurie: Sounds like a good mechanism, especially if it has worked for years without a problem. How much does the hub weigh? With blades, and without? When I...
31013
Rob Beckers
robsolacity
Jun 17, 2013 7:11 pm
... Laurie, there are some pictures on the GPT forum of your machine. If it is still the same design (sounds like it is from your description). Anyone that is...
31014
Laurie Forbes
laf@...
Jun 17, 2013 7:12 pm
... Pitch to stall does increase thrust load vs pitch to feather at high wind speeds. The flyweights can however be adjusted to provide pitch to feather but...
31015
Neil Dennis
wombat_eagle
Jun 17, 2013 7:12 pm
Yeah, I wondered about the same thing, FWIW, the big GE's next to me feather to stop or control also. IIRC, about 50 or so yrs ago, Mother Earth News had a...
31016
Laurie Forbes
laf@...
Jun 17, 2013 10:12 pm
... Haven't weighted the hub assembly but I'm guessing in the order of 100 lbs. Probably overkill all 'round but I'm a fan of the heavier the duty the better...
31017
Laurie Forbes
laf@...
Jun 17, 2013 10:13 pm
... Hey, thanks Rob - I was gonna look to see if the pics were still there ... Laurie Forbes [Non-text portions of this message have been removed]...
31018
Laurie Forbes
laf@...
Jun 18, 2013 3:39 am
... Looks like I posted too soon - checked the Green Power site and could not find the close-up pics of the hub (only pole mounted pics for an earlier two...
31019
Michael Klemen
wind4energy
Jun 18, 2013 4:05 am
Doug, ... So how many certified turbines are not reliable? Do you have the data to back that up? ... But how do we differentiate the ones that work from the...
31020
Doug
dougselsam
Jun 18, 2013 3:33 pm
Wow 100 lbs is somewhere near what my entire turbine weighs... :)...
31021
Laurie Forbes
laf@...
Jun 18, 2013 6:42 pm
... Ya, it ain't light. It's so heavy in fact that I cannot manually hold it up and install in one piece. As I mentioned, it could be made lighter but what...
31022
Doug
dougselsam
Jun 18, 2013 6:44 pm
... ****Do they really do anything? What about KEMA? What did they do? Ruin the California rebate system by certifying a system that you could have flagged...
31023
jerry freedomev
freedomev
Jun 18, 2013 8:07 pm
Hi Laurie and All, My 2kw unit will weigh about 60 lbs complete and well designed lightweight is a good start on a cost...
31024
Michael
mmk_tsm
3:20 am
Hi Freedomev, have you got any details that you can share with us? Is the 60lbs the total tower top weight? When will this machine be ready? Will it have...
31025
Michael
mmk_tsm
3:20 am
All, I have come across Windspot, and heard good reports about their wind turbines. They have a passive variable pitch system. And their generators are...
31026
Geoff Thomas
windlad2003
3:23 am
I have to agree with Doug on this topic, - it has been quite some years now since advanced renewable energy design has been driven by product knowledge, not...
31027
Michael Klemen
wind4energy
4:12 am
Doug, I wish you wouldn't take things out of context and twist them around... Your original statement was: " I told him I am not a big fan of excessive...
31028
Robert Preus, PE
rwpreus
5:18 am
I designed a mechanism that would pitch up to start and then hold a running pitch through the operating range and then pitch to feather for power control....
