[matt]

now my guess is its because its easier to rinse the glass because 2 jets have a wider coverage

my thoughts when rinsing at angles, wouldnt it be easier to control the spray with just the single jet

thoughts please

[ftp]

Use a swivel 

[NWH]

If you mean fan jets on the whole i would have to say no,i used to use fans and they were good only on certain windows IMO.The thing with fans is that the water in most cases goes everywhere even if the jet is placed in the middle of the brush i`ve tried it and the result was the same as 2 you can`t get enough precision with a fan compared to a pencil jet,if you do painted windows or leads fan jets can make an awful mess of them compared to pencils but those that do PVC windows allday long probobly love em.

[Jeff Brimble]

i am using an 8 jet pencil brush.
The reason for two jets is the manuf. cannot keep up, they are difficult to fit so 2 will do 

[peter holley]

one of my fan jets were blocked the other day, so i just worked with one fan...the pressure therefore was more powerfull just coming through the one jet....so same amount of water , but more pressure for rinsing and more precise

mmmm worth looking into :

[matt]

i have allways used fan jets, from cleantech that fit into the holders

anywhere sell pencil jets that dont charge 6 quid postage

oh and it needs to take the hozelock micro pipe

[trevor perry]

i use alex gardners brushes and they come with 2 x 2mm jets and have often thought it would be better using 4x1mm jets but have never tried, doing this you would use same amount of water but i think the jets would have more power has anyone tried this or is mytheory wrong.

[Jeff Brimble]

I usually get the diameters wrong but wouldnt you use less water ?

[Rob.Hall]

This is an interesting topic.
 
I have thought about putting the jets at an angle......Then again why not 4 jets two on each side angled towards each other to get a better rinse action......Then why not one then why not 4........then I get confused and.......  then I give up because I just dont have the time. Now you have got me thinking again....... Dohhhhh!!!!! 

[Mike 108]

i used to use fans and they were good only on certain windows IMO.The thing with fans is that the water in most cases goes everywhere

NWH - I know you don't like them, but I LOVE 'em.

My poles have 'triggers' on them which make control of the water (spray) much easier.

With a trigger, you can place/position the brush on the glass BEFORE operating the spray.

And with the bristles resting on the frame, and on the corners of the frame, you can press the trigger and give a real 'blast' of water to the edges/corners of the glass when washing or rinsing.

Also with the bristles resting on the frame, the water spray is contained within the confines of the brush.

Mike

[trevor perry]

I usually get the diameters wrong but wouldnt you use less water ?

the way i saw it but i may be wrong is that 4x1mm jets would use same water as 2x2mm jets

[ftp]

i have allways used fan jets, from cleantech that fit into the holders

anywhere sell pencil jets that dont charge 6 quid postage

oh and it needs to take the hozelock micro pipe

B&Q irrigation connectors i think they are. £2.50 for a pack of four or more - cheap as chips bit fiddly to get the right size hole. I'm sure that Diy forum would have the information you need. Are you a member? Jeff Brimble will know how to do it. I've used them in the past but found them hard to get them seated just right.

[matt]

i have allways used fan jets, from cleantech that fit into the holders

anywhere sell pencil jets that dont charge 6 quid postage

oh and it needs to take the hozelock micro pipe

B&Q irrigation connectors i think they are. £2.50 for a pack of four or more - cheap as chips bit fiddly to get the right size hole. I'm sure that Diy forum would have the information you need. Are you a member? Jeff Brimble will know how to do it. I've used them in the past but found them hard to get them seated just right.

  e.mail  for the info

diywfplink@yahoo.co.uk

[ftp]

Can't get on there tonight - internal server error 

[davids3511]

As far as I can remember from my maths one 2mm jet uses the same water as 4 1mm jets. Sounds wrong but if you work out the surface area it is correct -

pi x radius squared

2mm Jets 3.1415 x 1 = 3.1415

1mm Jets 3.1514 x (.5*.5) = 3.1415 x .25 = .785375

3.1415 (2mm jets)/.785375 (1mm jets) = 4

[matt]

Can't get on there tonight - internal server error 

its ok now, well it is for me

[michael papworth]

As far as I can remember from my maths one 2mm jet uses the same water as 4 1mm jets. Sounds wrong but if you work out the surface area it is correct -

pi x radius squared

2mm Jets 3.1415 x 1 = 3.1415

1mm Jets 3.1514 x (.5*.5) = 3.1415 x .25 = .785375

3.1415 (2mm jets)/.785375 (1mm jets) = 4

Yes, your maths is absolutely correct. The cross sectional area depends on the SQUARE of the diameter.

To replace 2 x 2mm jets you'd need 8 x 1mm jets.

[dai]

If you use Algarde or can get hold of some, jetting is so easy.
Get a thick drinking straw and cut it into 1cm lengths.
2] get some darning needles.
3] get a piece of smooth polystyrene packaging.
4] get a tube of Araldite rapid.
 Mix the Araldite and fill each piece of drinking straw, wax the darning needles lightly and after placing the pieces of straw on the polystyrene push the needles through, the taper of the needle lets you choose the jet diameter, and the needle goes into the polystyrene or a piece of plastic blister pack if you like.
When the Araldite goes off pull out the needles.
If you now take off the plastic straw you are left with a plastic jet that will push into the end of the Algarde hose.
Drill a 5 mm hole through the brush and push a length of Algarde through the hole [not easy as the Algarde is 6mm diameter] this is easier if you cut the Algarde so that you have a pointed corner.
When you have the Algarde through the hole you can cut it off square.
Now insert your plastic jet into the end of the Algarde, make sure you have a long enough length to allow you to fit your Y piece.
I leave the jetted piece so that it's flush with the top of the bristles, the jets are actually on the glass, no danger of scratching as I push the jet far enough into the Algarde which is made of silicon.
These jets work a treat as they are not having to fight against the bristles to get to the glass. dai

[Peter Fogwill]

You only need two jets with a fan spray.  If they are set up correctly, then you have a near even spray over the whole length of the brush.  Different storey though with pencil jets, I could see more being an advantage. 

Another good reason why fans are better.

Peter