[TowerTalk] FW: Rotor Position in tower

[Matt]

Assuming you are using a thrust bearing at the top of the tower, mounting
the rotor lower in the tower reduces side loading on the rotor - usually not
a limiting factor.   The thrust bearing normally supports the full weight of
the mast - assuming it is locked down to the mast.   Mounting lower in tower
does not reduce the maximum bending stress in the mast other than any net
shortening of the mast's projection above the thrust bearing (which would be
the same as using an equivalently shorter mast section).   Mounting lower in
the tower does distribute the lateral loads from the mast to the tower over
a wider span, but does not reduce the net bending moment transferred from
the mast to the tower.   Neither of these are typically limiting stress
factors within the top tower section.  Mounting the rotor lower in the tower
does also reduce the rotor's sensitivity to any radial misalignment if
present.

Hope this helps.

Matt
KM5VI





-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of
h.duck
Sent: Sunday, November 01, 2015 5:14 PM
To: towertalk at contesting.com
Subject: [TowerTalk] Rotor Position in tower

Could I get some input on placement of a rotor in a tower.  Is there an
advantage to mount the rotor, say ten feet down from the top verses the
usual three or four feet?

My rotor plate is not welded in place so I could place it at any level.

Thanks for any input.

Howard WA9YBW




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