Today's Message Index:
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1. 01:20 PM - Re: XS Fuel Tank Kiwi Mod (John Wighton)
2. 01:41 PM - Re: Instrument panel bolts (richard)
3. 03:25 PM - Re: Re: XS Fuel Tank Kiwi Mod (bill)
Message 1
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| Subject: | Re: XS Fuel Tank Kiwi Mod |
Sorry to be seen as a spoil sport. The intention was to highlight a very real
problem- mods and improvements that are excellently executed but may not maintain
a level of safety in relation to the original design. The main point, in
this instance, is that a pressure test is a no-brainer (how else do you know it
will maintain its contents under all flight conditions?).
Yes in the UK we do have a formal system of approving modifications. Yes it would
be great to have the Experimental system (as per US). That system allows
for great innovation and enables developers to get their aircraft flying without
much of the cost that has to be incurred in the UK (and other countries which
follow our system, of which there are many). What is does not do is allow
people to do what they want. Basic testing and calculations can not be circumnavigated
with risk of a failure. Failures kill people.
Suggesting that a test may be required for a fuel tank may seem like a dampener
to you. To me, as an aeronautical engineer, it is a mandatory action. Whats
more it costs nothing to do it. As l say a no-brainer.
--------
John Wighton
Europa XS trigear G-IPOD
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=420946#420946
Message 2
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| Subject: | Re: Instrument panel bolts |
Hi
I used metallastic rubber bushes to mount the whole unit onto the fire
wall having first made an internal mounting flange on the instrument
panel module. I reduced the original outer flange to about 10mm and once
mounted in place the thickness of the rubber of the metalastic bush gave
me an air gap for ventilation . To reduce the modules movement I added
one bush as a support from the top of the wheel tunnel just in front of
the throttle quadrant.
best of luck
Richard
From: Fred Klein
Sent: Monday, March 24, 2014 6:22 AM
Subject: Europa-List: Instrument panel bolts
<tonyrenshaw268@gmail.com>
Gidday,
I=92m stuck and was hoping someone could resurrect my momentum. I need
to know how long to make my instrument panel studs to accommodate a
washer, possibly conical, and probably only on the cockpit side, as the
other side should use either metal or phenolic washers. This means I am
having permanent studs out the back of the panel, going through the
firewall, and being secured on the engine compartment side of the
firewall.
Tony=85to get the benefit of vibration isolation, the SS 1/4=94 dia.
McMaster-Carr vibration damping sandwich mounts do the trick=85much
better IMO than any kind of a thru bolt...see cat. pg.:
http://www.mcmaster.com/#vibration-damping-sandwich-mounts/=r882gh
...photo below shows the male threaded stud each side, and there is also
a male / female style, 3 of which I used on the picnic tray STBD side
along w/ SS machine screws and finish washers.
I found the 1/2=94 long studs to be just long enough to penetrate the
firewall and to have room for a washer and stiff nut. Although a
stickler will notice that I lack the requisite visible threads beyond
the face of the nut, I do not consider that to be critical in this
instance.
Fred
DSCN0961.JPG
DSCN0964.JPG
No virus found in this message.
Checked by AVG - www.avg.com
03/23/14
Message 3
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| Subject: | Re: XS Fuel Tank Kiwi Mod |
Thanks John,
Just to put your mind at rest, yes all of the issues you highlighted
were considered and I am confident that the change to an aluminium tank
eliminating all of the issues that are experienced with the plastic tank
is a major improvement.
Loads and CofG were calculated and tank pressure tested.
The experimental system as we have in New Zealand has proven that it
does not compromise safety. We have an excellent record, one that is
improving all of the time.
The freedom it gives in being able to design and build virtually
whatever you like can only be the envy of those countries that do not
have it.
Regards
Sue and Bill Sisley
On 25/03/2014 9:19 a.m., John Wighton wrote:
>
> Sorry to be seen as a spoil sport. The intention was to highlight a very real
problem- mods and improvements that are excellently executed but may not maintain
a level of safety in relation to the original design. The main point, in
this instance, is that a pressure test is a no-brainer (how else do you know
it will maintain its contents under all flight conditions?).
>
> Yes in the UK we do have a formal system of approving modifications. Yes it
would be great to have the Experimental system (as per US). That system allows
for great innovation and enables developers to get their aircraft flying without
much of the cost that has to be incurred in the UK (and other countries which
follow our system, of which there are many). What is does not do is allow
people to do what they want. Basic testing and calculations can not be circumnavigated
with risk of a failure. Failures kill people.
>
> Suggesting that a test may be required for a fuel tank may seem like a dampener
to you. To me, as an aeronautical engineer, it is a mandatory action. Whats
more it costs nothing to do it. As l say a no-brainer.
>
> --------
> John Wighton
> Europa XS trigear G-IPOD
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=420946#420946
>
>
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