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Posts in Category: fairing mounts

Fairing mounts 

Friday, May 15, 2009 9:27:31 PM Categories: Bob Knight's fairing Correx corriboard corflute fairing fairing mounts
Ye Olde Nexte Steppe is to work out how to mount the fairing. Mine get mounted on rubber exhaust bobbins from Sir Alexander Arnold Constantine Issigonis's Mini, which annoyingly have 5/16UNF thread or something, so when you grope about on the workshop floor for an 8mm metric nut it doesn't fit. Anyway the rubber bobbins allow things to wobble about and generally are an organic sort of thing and I recommend them, which recommendation I naturally assume everyone in the Entire World will now defer to, according me appropriate honours. (Sir Alec's FRS will do for starters, if you please.)


 

Mr Knight is troubled by the business of fixing something to an irreplaceable Burrows Ratracer which lacks natural mounting points and is made of a slippery bit of round stuff that you can't weld to. (To which you can't weld. Shut up, pedant.)

I've now got the top mounts completed and the actual spine complete. (The spine is 8mm corriboard which he reports is very stiff.) The mounts are bolted to the corriboard and then the whole assembly zip tied to the frame; there is a layer of the apple crate foam twixt frame and mount, they seem secure although a bottom mount down near the seat will be a must as you suggested. (See? See? at every stage the boy comes grovelling to me on bended kn. for advice admonishment suggestions sagacity and experience. )

 
 
 
 


And a side view:

 


 

Now starting to work on the ribs which should progress reasonably quickly. I'll make them all in cardboard first before I cut any more of the 8mm corriboard which is expensive.

Fairing Measurements 

It has now been established

1. that I know Everything and

2. that Bob Knight knows Absolutely Nothing Whatsoever and so he has to consult me, always, to find out what to do next.

 

Accordingly I guided him smoothly onto the next stage by sending him a Fantastick Pickchure of how I'm building my own fairing, which of course will be much better than his. My fairings are always of foam, because foam is stretchy and bendable and silent and protective in a fall and cheap (the stuff blows out of apple crates and litters the roadside in 4x8 sheets) and they are always incredibly beautiful. Well, more beautiful than Paul Lowing's tailboxes.




My technique this time is to use a cruddy old mount and jam a sheet of cardboard (bike box) on it and then glue thin strips of cedar to blocks of willow and thereby make a 3D mount which weighs nothing.

 
Mr Knight is entranced and impressed by this technique, which he has only ever used a great many times when a schoolboy to make model aeroplanes. Accordingly:


 
 
Attached photo is of tonight's work As you can see the big effort at the moment is to get the dimensions correct around the feet. I'm going to extend the top bit to include my knees and trim a bit off so I can ride it down the street and check clearance; so far so good. I think effort spent on this now will be tres beneficial since it will prevent rework later. I can *just* start off in the lowest gear with the 'normous chainring. I will need to do this a few times I think. - Bob
 
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