Hi Fred.
The castellated nut is a standard AN part and was chosen because the split
pins can be inspected visually at any time.
Nylocks would work perfectly - but there is no guarantee that somebody would
not re-use them and you cannot gauge the integrity by looking at them.
I specified zinc passivated mild steel for both on the grounds that the
coefficient of expansion is about the same as the TP4 and the risk of
galvanic action is reduced.
The truth is that you could probably make the discs out of an anodised alloy
with no ill effects - and save weight into the bargain.
Nigel
-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com]On Behalf Of Fred Klein
Sent: 26 June 2007 04:57
Subject: Europa-List: Tailplane flutter
Nigel...very sweet (KISS) solution...one question: Why castellated nuts
rather than nylocs?
Also.. What material(s) did you use for your "discs" and "saddles"?
Fred
On Monday, June 25, 2007, at 03:29 AM, Nigel Graham wrote:
> To support the torque tube and prevent it distorting, 15mm wide
> cross-drilled discs are inserted into TP4 at each of the four stations.
> To spread the clamping load over a larger surface, "saddle blocks"
> (profiled
> to mate with the OD of TP9 and TP12) are fitted under the bolt head and
> castellated nut.
--
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