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Mono Factory Tail Wheel Mounting

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Area-51

Joined: 03 May 2021
Posts: 376

Posted: Thu Dec 01, 2022 10:00 pm Post subject: Mono Factory Tail Wheel Mounting

Hi, does anyone have some assembly images of mounting up the factory tail wheel on the classic mono?



John has fitted the assembly's mounting block to the interior bulkhead, however it is not aligned with the exit port on the fuselage for the pivot shaft... It's functional and connected to the rudder cables; trying to work out what has gone wrong in there.



Thanks

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Area-51

Joined: 03 May 2021
Posts: 376

Posted: Thu Dec 01, 2022 10:06 pm Post subject: Re: Mono Factory Tail Wheel Mounting

Just noticed; its been mounted upside down 🤦🏻‍♂️... ok, so does it stand off the bulkhead upon a mounting block, or bolt straight up to the bulkhead face?

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Duncan McFadyean

Joined: 18 Jan 2011
Posts: 218

Posted: Fri Dec 02, 2022 1:49 am Post subject: Mono Factory Tail Wheel Mounting

It looks like the mounting block is mounted upside down. The built-in stops can be seen on the bottom; these should be on the top.



Duncan Mcf.

 	  Quote: 	
		   On 02 December 2022 at 06:00 Area-51 <goldsteinindustrial(at)gmail.com> wrote:

 

 

 

 

 Hi, does anyone have some assembly images of mounting up the factory tail wheel on the classic mono?

 

 John has fitted the assembly's mounting block to the interior bulkhead, however it is not aligned with the exit port on the fuselage for the pivot shaft... trying to work out what has gone wrong in there.

 

 Thanks

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=509430#509430

 

 

 

 

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Area-51

Joined: 03 May 2021
Posts: 376

Posted: Fri Dec 02, 2022 7:13 am Post subject: Re: Mono Factory Tail Wheel Mounting

Thanks Duncan; yes correct... thought about it a bit more and John's standard of assembly; rather than error he would of had a reason and purpose to flip things upside down; probably control cable alignment. The aircraft has been set up for control rod to the rudder and then John has retro fitted after completion to just cables.

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Area-51

Joined: 03 May 2021
Posts: 376

Posted: Sat Dec 10, 2022 12:58 am Post subject: Re: Mono Factory Tail Wheel Mounting

After flying a circuit to the opposite end of the field for saturday coffee club followed by a fast taxi back to the hangar this morning, couldn't resist pulling off the inspection hatch to have a closer look; and yes cable alignment was confirmed as the reason...



John has also fitted formed pads under the bolt heads pinning TP-9 to the cross tube; not sure if that is a standard feature in the manual but it would spread the load evenly across the clamping region.



Another feature that has been added is the bracing block and side plates to the region around TP-18A. The green block is split halves clamping around TP-18A; loosening the brace would allow adjustment to be affected; not certain yet what material the green block is. It has a hardness of approx' 130.



With inherent issues related to elongation and slop in the tail plane cross tube over time and the way John has gone about bracing it would appear he has worked out the cause, or more likely identified the design flaw, and affected a solution which has proofed itself over 1400hrs total time in service.



The method points toward negating torsional mass inertia affects experienced by the sudden shock feedback of the mass balance impacting its stop at either extreme causing a stress moment at both the tail plane cross tube pins and TP-18A. Could be wrong but it makes mechanical sense.



Its an interesting find as just last week was thinking of fitting a valve spring or airbag at the mass balance stops to absorb its inertia, but not really knowing the downline benefits; just don't like the way it thumps to a standstill; thumps are not good, something always breaks...



John was really on to it; he knew his stuff!

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dmac7

Joined: 05 Apr 2019
Posts: 46
Location: Canada

Posted: Sun Dec 11, 2022 8:22 am Post subject: Re: Mono Factory Tail Wheel Mounting

Hello Area51, thx for sharing.  I see the contoured washer's and bolts instead of pins.  I tried something similar ( Rhichard Collins LAA aproved mod ) it uses nut plates on a sectioned piece of tube inside the torque tube & contoured washers and bolt's.  It seemed a great solution but when I torqued the bolt's I got slight distortion of the torque tube which caused tightness & binding. 

 In the end I went with 5/16" pins .0007 larger than hole and installed from the frezzer,  went in tight and are still tight.



That's a interesting mass balance tube beef-up, I never met John but I have heard he was a smart man, looks good to me.

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Area-51

Joined: 03 May 2021
Posts: 376

Posted: Sun Dec 11, 2022 1:29 pm Post subject: Re: Mono Factory Tail Wheel Mounting

It wouldnt at all be surprising to find John had dealt with tube crush as well by fitting a sufficient sleeve inside the cross tube.

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