MTfishingrods Posted October 28, 2008 Report Share Posted October 28, 2008 (edited) I took on a project that I shouldnt have but we all know how that goes. Anyways I need to figure out a way to make a rectangle piece of tin about 18" x 12" spin sort of like a willow blade does behind a spinnerbait. And a 12"x12"piece act like a colorado blade. This is a Advertisement sign and the shape canot be changed. It can be bent slightly as long as it can still be recognizable to customers as it is a nationally recognized product. Ihave been through 4 of these and have only managed to get the square ones to spin satisfactory. They dont have to be perfect. Just operable since a video will be made of this being fished. Right now I have them drilled at a corner and kind of formed over a oval football shaped like object. They almost spin but not quite. Any other ideas would help tremendously. I am tired of staring endlessly at these signs getting nowhere. I am hoping someone like Pete or Spike will come along with an idea thats outside my little box that keeps getting smaller and smaller every day. Edited October 28, 2008 by MTfishingrods Quote Link to comment Share on other sites More sharing options...
reeves Posted October 29, 2008 Report Share Posted October 29, 2008 MT, Somehow I am having a real hard time picturing this thing in my mind. Are these pieces of sheetmetal rotating around a pole? And is the wind the driving force here? If so, are using something that would resemble the swivel? Those are pretty good sizes of metal you are trying to rotate. Quote Link to comment Share on other sites More sharing options...
hazmail Posted October 29, 2008 Report Share Posted October 29, 2008 shane - As George is saying, a rough drawing would be real handy. Because of their asymmetrical shape, trying to spin a square, and rectangular blade sounds near impossible to me (blades are usually not uniform across both centre lines), but I think there may be a trick you could try. Besides George, the guy with a lot of the hydo/aerodynamic know how, would be 'Vodkaman' (Dave).pete Quote Link to comment Share on other sites More sharing options...
Kajan Posted October 29, 2008 Report Share Posted October 29, 2008 I think your problem is weight or enough wind for the weight of blade you have. What you call TIN, if prob Galvanized steel. Maybe if you try ALum you would have a chance with enough wind. I am assuming this is wind powered spinning device LOL. Disclaimer>>> I do not build any devices that look like a spinner blade. I do not build spinner baits. So any suggestion I give is prob not worth much I just cut bou'cou' metal Quote Link to comment Share on other sites More sharing options...
hazmail Posted October 29, 2008 Report Share Posted October 29, 2008 (edited) shane - how about if you do it on Polycarbonate or Perspex, it is clear under water, and is much lighter then Al or Brass and you can print/paint on it- NOTE, the square and rectangle would probably have to be the same surface area (to balance resistance/drag) . You could also maybe put a slight diagonal twist in each plate, instead of having them flat???????? [/img] OR this [/img] Pete Edited October 29, 2008 by hazmail edit text Quote Link to comment Share on other sites More sharing options...
diemai Posted October 29, 2008 Report Share Posted October 29, 2008 (edited) I've been thinking 'bout some kinda flaps like Pete as well , but I guess , that these have to be fairly large to overcome the resistance of the flat sheet in the water as it is supposed to spin . May be some kinda 90° offset flat "keel" bars leading from front corners to opposite rear corners(on the plane sides) to transist into the flaps , might enhance the spinning tendency to be achieved ? These would virtually act like the thread of a screw , I suppose ? All of these should be of transparent material bonded somehow to the sheet , so that the writing on it would still be visible ! But if it should work out at all , the sheet would spin rather slow , you could never get it to a higher speed of rotation , due to that sideward resistance of the flat planes , I made experimental lures before with a similar , but triangular , flat surface , they rotate quite slow ! Greetz , diemai Edited October 29, 2008 by diemai misspelling Quote Link to comment Share on other sites More sharing options...
Vodkaman Posted October 29, 2008 Report Share Posted October 29, 2008 (edited) MT, interesting project. But I am still a little confused as to whether it is intended to operate in air or water. It is a sign board, this points to air, but you also mentioned a video being made of the sign being fished, which points to water. You have received lots of good suggestions, so I am just going to add my thoughts. I am not a spinner bait guy, but have given their operation some thought. I think the tow eye should be in the corner and the curvature should go lengthways, across the diagonal, from the tow eye to the opposite corner. I am assuming that you don't want to get involved with double curvature. But it might turn out to be necessary, sorry. If it is operated in air, then you may have to go for a much lighter material, as mentioned previously. I am not going to get heavy with theory, but a couple of things do need explaining. The curvature across the diagonal is required to 'pull' the plate out onto the flow. The corner tow eye is required to give a leading edge for the vortex to form. This pulls the plate to one side and causes the rotation. The double curvature is required to allow it to slip through the water (or air) with minimal resistance. It all fits together in theory, but I could be way off base. Who knows? Also, I have noticed that both types of blades are symmetrical. This, I think is necessary. It also explains why you came close with the square plate. You did say the shape cannot be changed, but a kite shape might have more success, with the eye at the pointy end (kite in reverse). I really hope this helps. Good luck with it and post some pics when you're done. Dave Edited October 29, 2008 by Vodkaman Quote Link to comment Share on other sites More sharing options...
fish_rman2000 Posted October 29, 2008 Report Share Posted October 29, 2008 Hi I think Pete is on the right track with the rectanular one but you should try doing the flaps on the front lower corner and the rear upper corner as per Petes illustration. Just my take on making it spin Bill Quote Link to comment Share on other sites More sharing options...
dangercat Posted October 29, 2008 Report Share Posted October 29, 2008 Could the blades be motorized and mounted to a rigid pole, instead of flexible cable? Just a thought... Scott Phillips Quote Link to comment Share on other sites More sharing options...
MTfishingrods Posted October 29, 2008 Author Report Share Posted October 29, 2008 Sorry everyone, I should have explained better. This will be in the water. It will only be in the water one time to be filmed for advertisement and then hung on the wall. I will draw up a diagram of what I had in mind tonight and scan it into the computer with the aproximate dimentions. I know this may sound like a silly project to some, but it has some possible good exposure for me so I would really like to get this to work if I can do it. So thanks for everyones time on this. I really do appreciate it. Quote Link to comment Share on other sites More sharing options...
