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| DaveH:
Well drilled two holes in some 3" dia. Ali. Then spun it in the lathe. :) I think I get more wind noise from the jaws than from the holes :doh: Although I am bit wary of placing my ear too close! I have the feeling more holes, or it might need to be hollow. What we need here is a musical physicist :D DaveH |
| BiggerHammer:
Well, if all else fails you can duct tape some deer whistles to it. :lol: What size are the holes you drilled in the aluminum? could you stick some drinking straws in them with the ends cut at an angle? Let the straw protrude from the flywheel so it can catch air? Trying various angles to see if any work? There may be a boundary layer of slower moving air near the flywheel. The flywheel may be "dragging" the air with it. Not much on fluid dynamics here, (yes, air is apparently a fluid :loco:) but I know it can happen when an object like an airplane moves through air. Though I have looked at some whistling arrowheads and deer whistle designs. You may be able to incorporate the arrowhead design into the flywheel. It might also be cheaper and easier to make the prototypes out of wood instead of metal. Just from looking at the arrowheads you might try drilling the holes at about 45 degrees off center of the flywheel center. |
| BiggerHammer:
Just found this. I think it may solve your problem. The Chinese YO-YO or Diablo. http://hua.umf.maine.edu/China/ModernBeijing/pages/286_ChineseYoyo.html |
| DaveH:
BiggerHammer, Thanks very much :D Looks very promising - seems my round holes is not the way to go. :doh: Some thin slots and a square hole may well work. I'll give it a go :beer: DaveH |
| John Hill:
--- Quote from: DaveH on April 24, 2011, 11:50:30 AM ---Well drilled two holes in some 3" dia. Ali. Then spun it in the lathe. :) I think I get more wind noise from the jaws than from the holes :doh: --- End quote --- If it was my lathe the box full of straight cut gears would overcome any whistle noise! I think it might work if there is air flow and something to interrupt it. The radial holes in the flywheel would give the air flow (I think :scratch:) but they would have to be open at the hub end so air can flow right through then if there was a plate close to the rim at some part of the circle that would interrupt the air as each hole went past. My feelings are that it will be quite hard with the low RPM and the small diameter of the typical models we play with. Does your intended engine have an air exhaust? If so it might be practical to route that near the flywheel and use the exhaust as the source of air flow. :scratch: :scratch: :scratch: |
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