Wow..., I have never laugh no hard.But your right very educational. So you should checkout this video instead....," Testing My Experimental Wind Turbine Vawt "
Oh' man! I just watched all of the videos in order of date! My eyes have been wide open whilst hoping for a positive result. Then bam!! I almost wanted to break my keyboard lol! :)
@J2897Tutorials I should have had a generator on that one; it slows the turbine down. The good thing about testing to failure is one gets to see what happens to the blade (is it dangerous?), where are the stress points and how close are you to failure. Failure is very educational. :-)
@MrMldillman Thanks, but I don't want any guy wires on this pole. It's hard enough to mow around the things now. :-) I think I need to spend more time balancing my turbines.
really, you should have made the discs and blades out of aluminum. rolled to create an airfoil, and reinforced. and 9-12 blades. made a few experimental versions out of foam. that is always the result unless seriously reinforced.
As ever nice work. Hey things blow up, still worked though. Have a look on my vids about the continus coil, pm me for my excel file for pretesting before building. Check out muddymuddymudman too. I love VAWT's and i love alts. In one of my vids I made a prototyper for interchangeable blades, please have a look, it might save you some time in the long run. BTW I'm not a genius, well not yet hehe. Keep up the good work
Speed demands precision. You certainly have the speed! As you mention, balancing will be important, but distributing the forces will also be critical. With a supporting arm reaching to the top, would it be possible to draw power from a second generator on top to equalize the forces?
@carfancier1 I could add a second generator, but that would be more magnets and the wires would have to be routed through the support shaft. A tube connecting both disks could be added to carry the torque from the upper disk to the generator; it would also protect the shaft from the elements. I'm concerned about corrosion because if the support shaft rusts a lot, it will be hard to get the bearings (rotor) off. Back to the drawing board. :-)
Nice simple design, too bad voltage was not high enough to charger a 12V battery. Does that mean more turns of copper wire?
Some of the stress on the wing is due to the flexing of the pole that base is clamped to. Perhaps a 4"x4" wood fencepost would be more stable.
Did you put a fillet of epoxy / filler around the edge of the wings? That would likely fix the problem that caused failure this time. However there is too much flex in the wings, you may need a heavier glass cloth.
@skyl4rk I don't think more turns would help much. With the magnets on one side, the output varies a lot with the gap between the magnets and coils (more turns would increase the gap a bit.) I don't think I'd go the single sided route again.
I did put an epoxy fillet around the base of the wing, but the glass didn't go all the way to the base. The foam broke between the two. Although, a strip of glass tape would certainly help. :-)
@th3dig1tal0n3 I'm not 100% sure, but looking at the video frame by frame just before it broke, it made 4 revolutions in 10 frames which works out to be 720 RPM.
@Caleb6543 I was looking at stroboscopic effect, it is either 600+ or 1200+ depending on your camera frame rate (30 or 60 fps). The blades look good, they just need to be slightly stronger at the ends.
@th3dig1tal0n3 According to my video software, the original footage is 30 fps. I don't know if it gets changed when uploaded and processed by YouTube; I don't think it changes.
Thanks for sharing, what sort of power were you having out of it. Would it have worked better with a wing type shape to blades, ie flat side with upper foil
@RICHLES01 I wasn't getting any power from it. The generator was too weak to get to 12 volts (rectified) at a reasonable RPM. I put the generator data in there for reference in case someone wanted to know what to expect from such an arrangement. (The coil resistance is 5 ohms just for the record).
I think it could use a little more solidity (longer chord) to help with starting, a stronger wing, and it needs to be balanced. Perhaps my next project will be a dynamic balancer. :-)
With all that wind do live near a lake or in the hills or plains. I don't get anywhere near that amount around my place. Good job ... till it blew apart ...lol
@depravedpuma Lake Michigan is maybe 30 miles away, but we don't get much from that. Windy days during the summer are few and far between; perhaps once or twice a month.
good design and look at the speed!! Great. were you trying to pull any power at the time the wing parted company? As you can see from the video, it happened the way I guessed, with the top of the wings going faster than the bottoms where the torque is transferred to the alt, if you are pulling power , it happens sooner.. I think for this design if you do as you say and put the wings through the hub or run a tension member through the wing to the hub ,you could solve the issue. good production
I like this approach to the design. I wonder if there is some kind of fiber reinforcing that you could put in the epoxy to make it a little more ridged?
@EdgeRetro I think a strip of fiberglass tape along the outer surface would help a lot. It would be good to cut airfoil shaped holes in the disks and mount the blades through the holes with about 1/4 blade sticking out of each disk too. You don't know how close you are to the edge until you break something. :-)
Now that video took some work! I can appreciate that! Interesting resonance experiment. Did you get any numbers?? I wonder if the bowing is mostly due to the lift or the centrifugal force. Looks like you need to make a home wind tunnel - that would be slick and you could shorten the time between demises. ;-)
@Fearlessthinker I had to wait about a week before getting some video of the turbine in the wind. I was thinking of mounting a bracket on my bike for use as a wind tunnel so I could run tests whenever I wanted. :-) Wearing safety gear of course!
@Caleb6543 The Wright Brothers used to compare airfoils using their bikes, using a vertical axis in the center of the handlbars and one vertical airfoil to the left and a "neutral" one to the right in order to measure lift and drag before they went with a homemade wind tunnel in late 1901. The 1902 glider was greatly improved due to this testing, then scaled up for the 1903 "Flyer" powered flight. You are in good company!
Wow..., I have never laugh no hard.But your right very educational. So you should checkout this video instead....," Testing My Experimental Wind Turbine Vawt "
Mrinfoone 3 months ago
Looked really good until the end, but great job non the less
LuiNJae 4 months ago in playlist More videos from Caleb6543
Noooooooooooo!!!
Oh' man! I just watched all of the videos in order of date! My eyes have been wide open whilst hoping for a positive result. Then bam!! I almost wanted to break my keyboard lol! :)
J2897Tutorials 5 months ago
@J2897Tutorials I should have had a generator on that one; it slows the turbine down. The good thing about testing to failure is one gets to see what happens to the blade (is it dangerous?), where are the stress points and how close are you to failure. Failure is very educational. :-)
Caleb6543 5 months ago
Hey, how 'bout I fab you up a steel frame that'll support the top where you can run your wiring..? Let's chat =)
MrMldillman 6 months ago
@MrMldillman Thanks, but I don't want any guy wires on this pole. It's hard enough to mow around the things now. :-) I think I need to spend more time balancing my turbines.
Caleb6543 6 months ago
really, you should have made the discs and blades out of aluminum. rolled to create an airfoil, and reinforced. and 9-12 blades. made a few experimental versions out of foam. that is always the result unless seriously reinforced.
b101aa2 7 months ago
Good job man. go ahead :-)
maltub 8 months ago
As ever nice work. Hey things blow up, still worked though. Have a look on my vids about the continus coil, pm me for my excel file for pretesting before building. Check out muddymuddymudman too. I love VAWT's and i love alts. In one of my vids I made a prototyper for interchangeable blades, please have a look, it might save you some time in the long run. BTW I'm not a genius, well not yet hehe. Keep up the good work
20RoyalSuperKing 8 months ago
Speed demands precision. You certainly have the speed! As you mention, balancing will be important, but distributing the forces will also be critical. With a supporting arm reaching to the top, would it be possible to draw power from a second generator on top to equalize the forces?
carfancier1 8 months ago
@carfancier1 I could add a second generator, but that would be more magnets and the wires would have to be routed through the support shaft. A tube connecting both disks could be added to carry the torque from the upper disk to the generator; it would also protect the shaft from the elements. I'm concerned about corrosion because if the support shaft rusts a lot, it will be hard to get the bearings (rotor) off. Back to the drawing board. :-)
Caleb6543 8 months ago
Nice simple design, too bad voltage was not high enough to charger a 12V battery. Does that mean more turns of copper wire?
Some of the stress on the wing is due to the flexing of the pole that base is clamped to. Perhaps a 4"x4" wood fencepost would be more stable.
Did you put a fillet of epoxy / filler around the edge of the wings? That would likely fix the problem that caused failure this time. However there is too much flex in the wings, you may need a heavier glass cloth.
skyl4rk 8 months ago
@skyl4rk I don't think more turns would help much. With the magnets on one side, the output varies a lot with the gap between the magnets and coils (more turns would increase the gap a bit.) I don't think I'd go the single sided route again.
I did put an epoxy fillet around the base of the wing, but the glass didn't go all the way to the base. The foam broke between the two. Although, a strip of glass tape would certainly help. :-)
Caleb6543 8 months ago
@Caleb6543 Dual magnet rotors is the way to go. That thing must have been going around 2000rpm when it broke ? Nice work :)
specallez 8 months ago
@specallez I agree. That is the plan for the next one. :-)
Caleb6543 8 months ago
Did it break at 1200+ rpm?
th3dig1tal0n3 8 months ago
@th3dig1tal0n3 I'm not 100% sure, but looking at the video frame by frame just before it broke, it made 4 revolutions in 10 frames which works out to be 720 RPM.
Caleb6543 8 months ago
@Caleb6543 I was looking at stroboscopic effect, it is either 600+ or 1200+ depending on your camera frame rate (30 or 60 fps). The blades look good, they just need to be slightly stronger at the ends.
th3dig1tal0n3 8 months ago
@th3dig1tal0n3 According to my video software, the original footage is 30 fps. I don't know if it gets changed when uploaded and processed by YouTube; I don't think it changes.
Caleb6543 8 months ago
Thanks for sharing, what sort of power were you having out of it. Would it have worked better with a wing type shape to blades, ie flat side with upper foil
RICHLES01 8 months ago
@RICHLES01 I wasn't getting any power from it. The generator was too weak to get to 12 volts (rectified) at a reasonable RPM. I put the generator data in there for reference in case someone wanted to know what to expect from such an arrangement. (The coil resistance is 5 ohms just for the record).
I think it could use a little more solidity (longer chord) to help with starting, a stronger wing, and it needs to be balanced. Perhaps my next project will be a dynamic balancer. :-)
Caleb6543 8 months ago
Hey
You will probably need a spar inside the blade to keep it from bending so hard.
I wish you good luck
Your on the right track here, keep on going !
Greetings from Belgium
Erik
rikkiesix 8 months ago
@rikkiesix A spar would help. :-)
Caleb6543 8 months ago
With all that wind do live near a lake or in the hills or plains. I don't get anywhere near that amount around my place. Good job ... till it blew apart ...lol
depravedpuma 8 months ago
@depravedpuma Lake Michigan is maybe 30 miles away, but we don't get much from that. Windy days during the summer are few and far between; perhaps once or twice a month.
Caleb6543 8 months ago
All that time and effort. :( You do good work, sir. I'm sure you will get there.
Half the fun is inexperimentation. Maybe shorter foils? Or stacking foil plates like a 2-3 layered cake to add strength or as Edgeretro mentioned.
Pretty high RPM's. Impressive!
deadman12078 8 months ago
@deadman12078 Thanks! I'm still learning. :-)
Caleb6543 8 months ago
good design and look at the speed!! Great. were you trying to pull any power at the time the wing parted company? As you can see from the video, it happened the way I guessed, with the top of the wings going faster than the bottoms where the torque is transferred to the alt, if you are pulling power , it happens sooner.. I think for this design if you do as you say and put the wings through the hub or run a tension member through the wing to the hub ,you could solve the issue. good production
itsandbits1 8 months ago
I like this approach to the design. I wonder if there is some kind of fiber reinforcing that you could put in the epoxy to make it a little more ridged?
EdgeRetro 8 months ago
@EdgeRetro I think a strip of fiberglass tape along the outer surface would help a lot. It would be good to cut airfoil shaped holes in the disks and mount the blades through the holes with about 1/4 blade sticking out of each disk too. You don't know how close you are to the edge until you break something. :-)
Caleb6543 8 months ago
Now that video took some work! I can appreciate that! Interesting resonance experiment. Did you get any numbers?? I wonder if the bowing is mostly due to the lift or the centrifugal force. Looks like you need to make a home wind tunnel - that would be slick and you could shorten the time between demises. ;-)
Fearlessthinker 8 months ago
@Fearlessthinker I had to wait about a week before getting some video of the turbine in the wind. I was thinking of mounting a bracket on my bike for use as a wind tunnel so I could run tests whenever I wanted. :-) Wearing safety gear of course!
Caleb6543 8 months ago
@Caleb6543 The Wright Brothers used to compare airfoils using their bikes, using a vertical axis in the center of the handlbars and one vertical airfoil to the left and a "neutral" one to the right in order to measure lift and drag before they went with a homemade wind tunnel in late 1901. The 1902 glider was greatly improved due to this testing, then scaled up for the 1903 "Flyer" powered flight. You are in good company!
Fearlessthinker 8 months ago