Cheaper pullies?

Discussion in 'Workshop Tips and Secrets / Tools' started by cdlwingnut, May 29, 2018.

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  1. May 29, 2018 #1

    cdlwingnut

    cdlwingnut

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  2. May 29, 2018 #2

    Victor Bravo

    Victor Bravo

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    What kind of airplane are they going in, what cable tension are you using in the system, and how much change of direction are the pulleys making in the cable run? Those questions will drive the answer to your problem.

    Most ultralights and light LSA type aircraft operating at slow speeds, and using low cable teensions, can get away with marine pulleys, or hardware store pulleys, or home-made pulleys.

    Building a 250 knot airplane where it needs 40 pounds of cabale tension in the system to keep the controls from fluttering??? Better use the airplane ball bearing pulleys.
     
  3. May 29, 2018 #3

    proppastie

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    E-bay, or your local aircraft salvage yard.
     
  4. May 29, 2018 #4

    TFF

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  5. May 29, 2018 #5

    Pops

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  6. May 29, 2018 #6

    cdlwingnut

    cdlwingnut

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    The plans call cor an210-1a. Which is MS24566-1B now. It is for my ultra piet. Cruse speed about 60mph its for my control stick not much change in cable direction
     
  7. May 29, 2018 #7

    Victor Bravo

    Victor Bravo

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    Probably can get away with plain bearing plastic pulleys, marine quality, if you really want to save money. Your "cost" is more frequent inspection, lubrication, and replacement compared to aircraft hardware.
     
  8. May 29, 2018 #8

    Pops

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    I have a lot of pulleys but I think most of them are larger, but I'll look and see if I can find any that size.
     
  9. May 29, 2018 #9

    Turd Ferguson

    Turd Ferguson

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    For new phenolic may turn out to be the most economical. Polyethylene pulleys might be an alternative, initially they may appear more economical but it's common to use a bushing in the hub instead of a bearing, which makes up the savings. Aluminum pulleys are becoming more common in airplanes but they will run about 30% more than phenolic for the same thing.
     
  10. May 31, 2018 #10

    Pops

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    I looked and sorry I don't have any pulleys that small of diameter.
     
    MadRocketScientist likes this.
  11. May 31, 2018 #11

    proppastie

    proppastie

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    I was going to use those because they are small and light.....Checking I found they are below the minimum bend radius for large bends for 3/32, They mostly are used for 1/16 trim for slight bends where a homebuilder might use a nylon fairlead, or phenolic rubbing block. They will fit 3/32 for same.
     

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