Hi Pod,
I perhaps went off a bit about free access to the engine... was a bit tender at the time of writing... and essentially, I was more referring to the open (vertical pointing) pipe looking ominously skyward towards overcast skies. I was worried about water ingestion, needlessly as it turned out, rather than dust.
Of course I am fully aware of the standard air filter, and I know that it is all that is necessary for most situations with regular appropriate maintenance. However, I grew up in western Qld and have done many many trips in dry dusty areas, having been through several intense dust storms, heavily overgrown narrow property tracks, but more often the long stretches of unsealed dusty tracks. In still air the dust can simply hang there, and I fully appreciate any additional benefits provided by a pre-cleaner of some sort.
You don't have to sit up someones bum to cop a lung full of dust. On the way back to Braidwood the other day, there was no hint of any breeze. The tight trails through the hills seemed to have the dust hanging completely still like a thick fog. We actually sat on the road for almost ten minutes at one point and there was no improvement. This is quite a common phenomenon. We had to get moving at some point. This type of dust is talcum powder fine, and gets through every "seal" in the defender to coat the occupants 
 
I am still at a loss as to how the Syklone came loose (if that's indeed what happened). It was carefully installed and tightened appropriately with a very secure (supplied) clamp. As I said previously, I'll take the blame and say 
I should have checked everything more thoroughly prior to the trip.
Maybe at tax time I'll feel sufficiently flush to buy another one and try again, but maybe I'll look into some additional retention system just in case... or I'll just stick to the safari head for the near future.
All in all, I thought the Syklone was a worthwhile investment and a great design.
Cheers,
Nige
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