Hi John, these are
probably very similar test results Swift arrived at during similar testing at
Millbrook, the problem I have is they don't show the results in practice I see
every day?!
The problem as I see it, is a combination, two
or four wheels with various out of balance forces, speed chosen, nature of
journey etc, plus and not least, maximum load tyre pressures regardless of
actual load and perhaps plus a bit more for good luck! Twists and turns in the
road will also alter the frequency as wheels move in and out of relation too
each other, all combining to vary frequency produced
All these variables then and over time, are
combining to produce vibration at a particular frequency that can and does
harmonise with something in the van, be that a part of the gas fire, certain
electronic parts of a battery charger also common, screws in offside walls and
or near side wheel nuts are both common and it's certainly a common effect
affecting these two!
So road surface?, I don't wear this, simply
the problem would be far more relevant and not only in caravans if this was the
root cause, No, I don't see roads as more than acerbating the issue. You don't
get any worse than the Lincolnshire
tracks I drag my van over without any issues!!
Moreover, in my line of
work I get into discussion with many customers/dealers both large and small,
one particular dealer selling a very well known motorhome brand, sends his
stock straight to the local tyre place, even before arriving at the sales
pitch! Told me the stupid little warranty
faults have been massively reduced since this practice was adopted, there’s a
caravan dealer in Norfolk
does and says exactly the same thing…so where’s the common denominator in that?
now’t to do with road surfaces, that’s for sure!
So back to this question, Truma themselves
have blamed a poor high resistance connection to the stats spade, it's not
though because they have always been tight when I try and pull them off, so it's
obvious to me the start of it is elsewhere. The stat itself is not best
quality, I'll grant you, but in theory given the job their designed to do at
125 or 175degsC, should never be called into use, just sitting there dormant
'just in case'
So they arrive working perfectly, are not worn
out by over use, connections are still tight after the rest has fell apart, or
more common, developing minds of their own and tripping where no heat is
present let alone 125/175C?! On top of
that, some appear to self destruct but far more happily work as designed
without any issues!
But finally, why would a manufacture except
'test results' as being conclusive while not taking very basic precautions to
eliminate the unknown? It's a fundamental engineering principle to balance anything
that spins, nothing is going to change that, so why ignore it in favour of a
couple of short duration but favourable test results?.
To me, there is no logic in that at all, just
balance the damn things and be done!!
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