Propex vehicle in motion

Discussion in 'Mech Tech' started by Dazza, Dec 6, 2017.

  1. FWIW for our Propex bought last year I bought the Vehicle-in-Motion bracket and used it to support the pipe ends just under the side of the bus. Haven't had any problems with it, and it happily heats while we're driving even in strong winds and at high speeds.

    The bracket effectively provides the same shielding to both pipes, so any wind affects both equally. You could probably fabricate something that would look the same and do the same job.
     
    fritt likes this.
  2. 77 Westy

    77 Westy Supporter

    ^:thinking:
     
  3. Maybe pics and where it exits would help @Dazza fabricate one ??
    Can`t see him paying for a bit of ally plate ;)

    :hattip:
     
  4. Dazza

    Dazza Eyebrow not high brow

    I've seen the propex one, I reckon I'll cut a section out of 100mm galv trunking , drill a couple of 32mm holes..tek screw it to the chassis and it'll be fine...all for the princely sum of sod all :):)
    Worth a try..
     
  5. You can't use galv !!!!!!!
    It has to rust at the same rate as the rest of the bus ,surely



    I know ..........don't call me Shirley
     
  6. Dazza

    Dazza Eyebrow not high brow

    I won't paint the cut edge...is that OK? :)
     
    Fat_Brum, steve77bay and Valveandy like this.
  7. mikedjames

    mikedjames Supporter

    Look at the direction of the pipework on those pulse jets. Intake and exhaust both point backwards.
    The engine sucks in a load of air slowly and throws it out fast. It accelerates a mass to the rear which produces thrust.
    If a jet engine goes too fast the flame blows out just the same, so supersonic aircraft take in air which is mostly stopped by movable baffles.

    A jet engine would work if the air came in at the side or the back just provided there is enough air flow to compress to feed the fuel injectors in the combustion chambers for it to heat and expand the air so it comes out faster.
    Its more a convenience of design to have axial flow jet engines. Its useful to keep the exhaust away from intake to keep control of the mixture..
     
    Last edited: Dec 9, 2017
    Valveandy likes this.
  8. Phew disaster averted
     
    Dazza likes this.
  9. Dazza

    Dazza Eyebrow not high brow

    In the interests of health and safety folks and to protect TLB and Mike from being sued...

    Please wait till the jet has been switched off and has had time to cool down please...
     
  10. Here are pics of my installation, using the official bracket. I made a secondary bracket out of some galvanized steel from an old washing machine, to obtain a downward slope on the outlets.

    The pipes come through holes drilled in the chassis, and then oval holes in the undertray. The supplied P-clips were slightly bent to hold the pipes at the exit points to stop any rattling.

    20171210_152106.jpg 20171210_152008.jpg 20171210_152610.jpg
     
    fritt, Dicky, art b and 2 others like this.
  11. Supurb solution..
     
  12. Need to do that with mine as currently pipes are clipped to the underside. Tidy job there.
     
  13. Very neat. I must admit that on the face of it I wouldn't have thought that the side by side arrangement would work but it obviously does. :thumbsup: Maybe one day I'll get around to re-jigging mine!
     
  14. Thank you for your kind comments :) The P-clip-inside thing came to me all of a sudden, and I did feel quite pleased with it!

    I did destroy a hole saw drilling through the chassis, though, and the oval holes took quote a lot of patient filing with a half-round file.
     

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