yet another vawt rotor part2
By Stonebrain, Section Diaries Posted on Mon Aug 25th, 2008 at 09:45:13 PM MST
a ponybrake too

progress on the rotor is not spectacular,did some lathework too. I hope the images told the story.If something's not clear,ask and I will explain. There is a ring of the thrust bearing missing on the images but it got stuck in the bearingholder,because it was fitting well,on the right place,no need to get it out again. There are some images about the prony-brake too.In fact this was my first lathe-exercice.the bearings is the same as for my vawtrotor,although the thrust bearing  is somewhat overkill it was just an exercice for the 'real' bearing-version. In fact the idea for the pronybrake was based on flux and wundstuffs idea 'clamp the shaft between two pieces of wood' I tried to do this the right way.We'll see if it will work. In the lath I veryfied that the braking force can be adjusted well with different speeds.What I don't like about mechanical brakes is that braking force is not regularly going up with speed so you probably have to adjust it veryu often. width=80%> So far till now cheers, Jaap

yet another vawt rotor part2 | 14 comments (14 topical, 0 editorial)

Re: yet another vawt rotor part2 (3.00 / 0) (#1) by Stonebrain on Mon Aug 25th, 2008 at 03:51:39 PM MST (User Info)

some more pics

Re: yet another vawt rotor part2 (3.00 / 0) (#3) by vawtman (vawtman(at)charter(dot)net) on Mon Aug 25th, 2008 at 04:43:08 PM MST (User Info)

Hi Stone  What's your thoughts for the blades?  Nice Job !! [ Parent ]

Re: yet another vawt rotor part2 (3.00 / 0) (#6) by Stonebrain on Tue Aug 26th, 2008 at 04:21:45 AM MST (User Info)

Hi v.m. The 'blades' will be attached to the deltas that you see on the extremities of the arms It will be constituted of two bambou 'masts' and a sail of very light tissu(I have some  parachute tissue)The resulting 'blade' will be a delta of about 3m high (10') and 40 cm wide (1.4 foot) in the middle(level of the arms). With a rotordiam of 1.40m (4.7 foot)  the height of 3m seems extreme,but I hope reducing the weight of the blades to the extreme it will be safe,without dangerous vibrations,and for a vawt a very good rpm/torque ratio. cheers, Jaap   [ Parent ]

Re: yet another vawt rotor part2 (3.00 / 0) (#12) by vawtman (vawtman(at)charter(dot)net) on Tue Aug 26th, 2008 at 04:15:59 PM MST (User Info)

Boy Stone that's gonna take one heck of a tower.What are your plans?  Will be an awesome lookin machine. [ Parent ]

Re: yet another vawt rotor part2 (3.00 / 0) (#2) by SparWeb (sparweb at ANTISPAM_hotmail_com) on Mon Aug 25th, 2008 at 04:35:02 PM MST (User Info)

"progress on the rotor is not spectacular..." Perhaps not yet, but it will probably look spectacular when you're done. Nice woodwork.  Because VAWT's haven't been perfected nor optimized, there's lots of room for artistry. Am I correct in believing that the brake attachment will be replaced in the future with a generator attachment?  If so, then will you support the rotor with a large box attached to the aluminum cylinder, with the generator inside the box? Steven Fahey

Re: yet another vawt rotor part2 (3.00 / 0) (#7) by Stonebrain on Tue Aug 26th, 2008 at 04:38:14 AM MST (User Info)

Hi s.w. The next step (building the blades,see my response to v.m.)will be very spectacular. The aluminium cilinder with the bearings will sit in a steeltube,that will be attached to the tower.The pronybrake will be sitting on the ground(need for continuous adjustment)The shaft going down must be stiff and light (again),to avoid extra bearings.I'm thinking of bambou again. If you know a bambou 'forest',bambou sticks have an unbeatable stiffness/weight/price ratio. I hope the pronybrake tests will allow the decision if it's worth building a alternator,kind of systematic aproach. cheers, Jaap [ Parent ]

Re: yet another vawt rotor part2 (3.00 / 0) (#4) by tecker on Mon Aug 25th, 2008 at 07:17:59 PM MST (User Info)

It's a big unit and heavy  I 'll bet . Your way too far to turn back now . great project .

Re: yet another vawt rotor part2 (3.00 / 0) (#5) by Dave B on Mon Aug 25th, 2008 at 09:40:11 PM MST (User Info) http://www.madbbs.com/users/bruggelog

Great work and I can tell that you "see" this in a finished form. Even now it does not look home brewed and thank you for sharing your photos.  Keep us posted, it's this kind of spirit that started this board and I for one applaud the creativity of any posters willing to show us what's got them hooked on Alternative Energy. Bring it on, it's great stuff.  Dave B. [ Parent ]

Re: yet another vawt rotor part2 (3.00 / 0) (#9) by Stonebrain on Tue Aug 26th, 2008 at 04:45:23 AM MST (User Info)

Hi Dave B, I gave some explanations,that maybe allow you to 'see' what I have in mind. Hope you will see the pictures soon. cheers, Jaap [ Parent ]

Re: yet another vawt rotor part2 (3.00 / 0) (#10) by Dave B on Tue Aug 26th, 2008 at 10:56:06 AM MST (User Info) http://www.madbbs.com/users/bruggelog

I look forward to seeing more photos as you progress. My comment was all positive, what I meant was that you can visualise what you want this to be already and I can appreciate your work so far, I'd say it's like art.  Dave B. [ Parent ]

Re: yet another vawt rotor part2 (3.00 / 0) (#8) by Stonebrain on Tue Aug 26th, 2008 at 04:40:49 AM MST (User Info)

Hi tecker, Yes I see it big,but not heavy. cheers, stonebrain [ Parent ]

Re: yet another vawt rotor part2 (3.00 / 0) (#11) by harley1782000 on Tue Aug 26th, 2008 at 02:47:11 PM MST (User Info)

First I would like to say that is cool and can't wait to see pic's of it up and running.  I was curious what you used to carve the wood with.   Jim

Re: yet another vawt rotor part2 (3.00 / 0) (#13) by oztules (oztules__at__bigpond.com) on Thu Aug 28th, 2008 at 03:58:05 AM MST (User Info) http://www.anotherpower.com/gallery/Oztules-toys

It just never ceases to amaze me the building talent this site has. It's just great. Hopefully the figures will be too. .........oztules Flinders Island Australia

Re: yet another vawt rotor part2 (3.00 / 0) (#14) by brokengun on Wed Sep 10th, 2008 at 09:57:53 PM MST (User Info)

I highly appreciate the photos of this construction. I'm in awe of the craftsmen on these forums and involved in small windpower. To an unskilled carpenter like me, this looks amazing. I don't know as much as I would like to about VAWT but I've always really appreciated those who experiment with them. Please post pictures once this is up and running, it will be appreciated. Probably by more people than you'll realize. Keep it up! [ Parent ]

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