Dirt Skirt

[the1andonly]

how big a gap between road and brushes is recommended?

 

[davejen]

I uesd one with a gap of about 1 inch, keeps most of the spray down and didn't wear away over bumps etc.
Cheers, Dave

 

[teddybear]

Our brushes touch the road. Keep waiting for them to wear down,but ,in 2 3/4 year I can't see any difference. Never mind at least am helping the council roadsweepers

 

[Podney]

Three quarters of an inch.

 

[Nirvanauk]

22mm for us.

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[the1andonly]

22mm for us.

so 3mm more than 3/4" or 3.4mm less than an inch for us imperialists.
Thanks for all the responses

 

[Cheshirecat57]

Anyone recommend which dirt skirt?

 

[Ivory55]

Food grade conveyor belt can be brought quite cheap

 

[tacr2man]

You can let it touch the floor when stopped as it usually blows up and back in the slipstream, or at least it did on my RV , never seemed to get any shorter

 

[bigtwin]

Is there any evidence that these provide any tangible benefit?

Ian

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[Cheshirecat57]

Is there any evidence that these provide any tangible benefit?

Ian

When did "evidence" get involved in an accessory purchase?

 

[tacr2man]

They cut down on stones getting thrown up onto front of trailer/etc following , and they cut down on the spray up the back , by collating the atomized moisture into bigger drops that drop to surface rather than get picked up in airstream , they also tend to divert airflow out to sides , and also cuts down therefore on amount that gets sucked up into low pressure area directly behind vehicle . They can be further helped by fitting strakes to rear edge of roof top to divert air into that same low pressure area and further deplete it HTSH .

 

[Figaro]

Someone told me the drag would affect mpg so as I don't need it for a trailer, I removed the dirt skirt on a trip to Croatia, made no difference to mpg

 

[bigtwin]

They cut down on stones getting thrown up onto front of trailer/etc following , and they cut down on the spray up the back , by collating the atomized moisture into bigger drops that drop to surface rather than get picked up in airstream , they also tend to divert airflow out to sides , and also cuts down therefore on amount that gets sucked up into low pressure area directly behind vehicle . They can be further helped by fitting strakes to rear edge of roof top to divert air into that same low pressure area and further deplete it HTSH .

That’s the ‘theory’, but in practice .....
?

Ian

 

[Figaro]

That’s the ‘theory’, but in practice ..

They definitely do keep dirt off the back of the van and I'm sure off a tow car but never having towed I can't confirm that.
If I wanted to tow I'd definitely have a dirt skirt

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[Geo]

That’s the ‘theory’, but in practice .....
?

Ian

I can confirm tactr2mans hypothesis as im often finding myself on the bonnet of towed vehicles if only to check the theory

 

[Larrynwin]

Have had dirt skirts on RVs and now on my Hymer , towing with all of them and the toad and rear panel of the motorhome stay markedly cleaner.

 

[Cheshirecat57]

That’s the ‘theory’, but in practice .....
?

Ian

Are you a management consultant Ian?