Page 1 of 2 12 LastLast
Results 1 to 8 of 15

Thread: Setting blade pitch..

  1. #1
    Less than 10 posts so far! USER IS NOT AVAILABLE
    Join Date
    Jan 2006
    Posts
    0

    Default Setting blade pitch..

    The time has come to set the required blade pitch on my fan



    A while ago I had a sketch that someone sent me that showed the measurements from the blade edges to the hub at each pitch setting to allow simple setup... does anyone have a copy of this?



    If not, what other ways are there of getting an accurate pitch setting?



    (I have a 9-9 5ZL 920)



    Thanks

    Dunc

  2. #2
    Less than 10 posts so far! USER IS NOT AVAILABLE
    Join Date
    Jan 2006
    Posts
    0

    Default Re: Setting blade pitch..

    Hi,



    Your best bet is to set them at 45 degrees, you could use a square for this, then do a rev test on your engine. You maybe bang on your required revs with this which means you can just leave it. Otherwise back them all of a little and re check the revs. Keep doing this until your engine runs at the required revs when flat out.



    You have to make sure all blades are at the same angle. The easiest way to do this is to clamp a piece of steel or similar to the engine frame so that it is just touching the laeading edge of the blade. Then you can spin the fan round and adjust the blades so that they all touch the piece of steel. You will then know that all the blades are at the same position.



    The actual angle doesn't matter, so long as they are all the same and your engine runs at the required revs.



    Hope this helps



    nick

  3. #3
    Less than 10 posts so far! USER IS NOT AVAILABLE
    Join Date
    Jan 2006
    Posts
    0

    Default Re: Setting blade pitch..

    I know what pitch I want to set the blades to, I just cant figure out how to get them to that angle...



    Trial and error might be a possibility, but with so many bolts its going to take hours!

  4. #4
    Less than 10 posts so far! USER IS NOT AVAILABLE
    Join Date
    Dec 2005
    Posts
    0

    Default Re: Setting blade pitch..

    I'll mail you a table for 5Z blades where you can measure the distance from the leading edge (or trailing edge) to the split in the fan hub



    i'm at work at present and don't have it handy



    Tony

  5. #5
    Less than 10 posts so far! USER IS NOT AVAILABLE
    Join Date
    Jan 2006
    Posts
    0

    Default Re: Setting blade pitch..

    This method is only partially possible with a 9-9 fan, because the blades overlap and it is difficult to then measure the distance. You will need to put 3 blades in and set the required angle, using the measurement method, mark the position of the hub split line on the base of the blades. You can then either do the same with the rest or fit all blades and using the 3 marked as a guide, do the first adjustment as suggested with a hacksaw blade or similar. They can then be finely adjusted the same way.



    Dunc check your gmail address.


  6. #6
    Less than 10 posts so far! USER IS NOT AVAILABLE
    Join Date
    Jan 2006
    Posts
    0

    Default Re: Setting blade pitch..

    Dunc,

    Perhaps this document will help you?
    Attached Files Attached Files

  7. #7
    Less than 10 posts so far! USER IS NOT AVAILABLE
    Join Date
    Jan 2006
    Posts
    0

    Default Re: Setting blade pitch..

    Quote Originally Posted by srn4
    I know what pitch I want to set the blades...
    Adjustable angles include 25; 30; 32.5; 35; 37.5; 40; 45 & 50 degree settings.

    If you decide to use the pin settings, and together with the document Hovertrekker already put out, maybe these pictures will simplify things a bit.

    [img]index.php?t=getfile&id=162&private=0[/img]

    Be sure you use the correct metal pins that generally come with the fan!



    There should also be some markings on the bottom of the blade. Use a marker and you'll see them better.

    Here is a german version with pictures that outlines the procedure a bit better. (...BTW. one of the sentences says the manufactures warranty expires if you do this, yet these seem to some pretty good instructions, don’t you think!!!)
    Attached Images Attached Images
    Attached Files Attached Files

  8. #8
    Less than 10 posts so far! USER IS NOT AVAILABLE
    Join Date
    Jan 2006
    Posts
    0

    Default Re: Setting blade pitch..

    the pins that come with the fan are plastic!

Similar Threads

  1. blade hub
    By mick - n/a in forum General Forum
    Replies: 4
    Last Post: 6-Oct-06, 01:44 AM
  2. fan blade clearance
    By erbus - n/a in forum General Forum
    Replies: 1
    Last Post: 25-Jul-06, 07:09 AM
  3. blade adjustment
    By lazza - n/a in forum General Forum
    Replies: 34
    Last Post: 31-Mar-06, 08:50 AM
  4. Fan Blade Problem
    By Sean Atterbury - n/a in forum General Forum
    Replies: 13
    Last Post: 30-Jan-06, 04:45 AM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •