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Tailplane shaft installation

 
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coatbeam(at)melbpc.org.au
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PostPosted: Tue Oct 02, 2018 12:40 am    Post subject: Tailplane shaft installation Reply with quote
When mounting my tailplane shaft I made sure the Fuselage 'boat' was
rigid in this area by permanently fitting a strut just forward of the
shaft at the point shown in Chapter 18 Fig 1 withe dimension of 132 mm
(see picture). This is an absolute must to keep this area rigid;
regardless of having a solid dolly to hold the fuselage at about 5
locations. Over the several years of construction the tailplane shaft
has always been easy to move - no slop, no friction.
Graeme Coates
Europa 423
Melbourne OZ
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grahamsingleton(at)btinte
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PostPosted: Tue Oct 02, 2018 1:40 am    Post subject: Tailplane shaft installation Reply with quote
Hi Graeme
Another point of some importance for builders to remember is that the tailplane torque tube is chrome plated 4130.
Be careful not to damage the plating or distort the tube. Wasn’t it precision ground to size?
Graham
Wish I had a shed like Graeme’s!

Quote:
On 2 Oct 2018, at 09:35, Graeme Coates & Sharon Beaman <coatbeam(at)melbpc.org.au> wrote:

When mounting my tailplane shaft I made sure the Fuselage 'boat' was rigid in this area by permanently fitting a strut just forward of the shaft at the point shown in Chapter 18 Fig 1 withe dimension of 132 mm (see picture). This is an absolute must to keep this area rigid; regardless of having a solid dolly to hold the fuselage at about 5 locations. Over the several years of construction the tailplane shaft has always been easy to move - no slop, no friction.
Graeme Coates
Europa 423
Melbourne OZ


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n7188u



Joined: 15 Nov 2015
Posts: 404
PostPosted: Wed Oct 03, 2018 1:37 pm    Post subject: Re: Tailplane shaft installation Reply with quote
Graeme,

Thanks for the feedback. I did make the front strut bigger (not as big as yours but quite rigid it is) and found to help a lot. I still needed the struts aft of the bulkhead so that when the top fin skin is cleoed to the bottom fuselage the friction in the torque tube wouldn't increase.

I see you have some sort of cross member in the front of the bulkhead toward the bottom, holding the rudder cable. I bet you that also stiffens the side skins also.

Anyway, I am not implying all this is needed (except for the front strut) but in my case the addition of the top caused enough deformation to cause slight binding which I didn't want. The addition of the ribs or struts in my case was to return the bottom aft fuselage section to the shape it had when I bonded the bearings. Again, seems to work.

Chris

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coatbeam(at)melbpc.org.au
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PostPosted: Thu Oct 04, 2018 12:24 am    Post subject: Tailplane shaft installation Reply with quote
In this picture is a strut holding the rudder cables; this is to ensure
the cables approach the Singleton bellcrank precisely in line with the
bellcrank, and not having a downwards force component. It may also
provide some stiffening of the fuselage in this area, but it was not the
intention.
Graeme
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