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Eye bolt tie down through wing/flap hinge block (trike o

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frans(at)privatepilots.nl
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Posted: Tue Nov 22, 2011 2:31 am Post subject: Eye bolt tie down through wing/flap hinge block (trike o

On 11/22/2011 01:35 AM, Nigel Graham wrote:



 	  Quote: 	
		   Don't forget that this mounting point was originally designed and

 stressed to mount the outrigger on the original mono-wheel. Consider if

 you will, the compressive shock loads imposed by an unforgiving landing

 on rough grass,


	


Yes, I realize that. But what is the duration of a landing roll compared 

to a whole night in constant movement due to the wind? it is unlikely 

that you will experience metal fatigue just due to the landings, but how 

about prolonged rocking in the wind? Isn't this the same reason why we 

try to restrain the flight controls while parked in the wind? Normal 

rudder use is different than constant movement due to the wind, although 

the movement by itself is similar.



 	  Quote: 	
		   or the lateral loads imposed during turning.


	


I don't have a mono but I think the lateral load is taken up solely by 

the main gear, and the outrigger just keeps the wing of the ground.

I doubt that the hinge attach points will see any sideways loads at all 

during their life, that is, if they are used for their intended purposes 

only.



It is just a piece of metal sticking out of the wing, I can imagine that 

it can easily develop metal fatigue just at the edge where it protrudes 

if you wiggle it long enough. The material and the construction both 

indicate that it is not designed for this kind of movement, but I'm not 

a metallurgist so I could be wrong.



Frans

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gholland(at)content-strea
Guest

Posted: Tue Nov 22, 2011 2:51 am Post subject: Eye bolt tie down through wing/flap hinge block (trike o

Regarding laterals loads on outriggers.

Watching a Europa Mono turn or manoeuvre on the ground and especially grass is a torturous sight. Being pull backwards, even worse.

The nylon often bends way out of true and that must inflict loads to the mountings. They seem sufficient in that case.

I fitted tie down eyes to the outboard Flap fixings on a Trigear. Based on the insight of that fixing area when building it, I think it has a good strength capability and doesn't compromise long term fixing.

All of this is my ageing and confused opinion!

Regards

Gerry

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gavanne(at)iconz.co.nz
Guest

Posted: Tue Nov 22, 2011 12:31 pm Post subject: Eye bolt tie down through wing/flap hinge block (trike o

The Europa sits very nicely in the wind, it might rock around a bit but it's important that the tie down ropes are only loosely tied with some slack, it's rare that the wind will blow hard enough to move the aircraft, (on grass anyway), In 3 years of tying down a Europa at out stations I've never had it pull up hard against the tie downs so they are not under continuous stress, mainly there for the odd gust that might come through.

Depends where you live and what your weather patterns are of course



Gavin Lee..............ZK-EPA



--

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