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Old 02-01-2012, 04:04 AM   #151
640 Armageddon
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I have worked before with HDPE and PE and It depends on the geometry of the tower (the connection with the frame to be more specific). It can easily flex that much and it will produce the spring back effect. It is a good material to put on the bike, almost indestructible but difficult to work with. I would always prefer mechanical connections if I was working with it as somebody made clear before. I have welded PE with great success before but I would not do it on a Rally bike as it will be a major setback if anything goes wrong.

I am building my own nav tower at the moment, using aluminium and ss. So far it is less than one kg. As far as the vibration is concerned I would try the dampeners that the 640 Adv has from the factory. I am building also a bash plate but it is going as slow as a snail at the moment ... The plan is to check the space that I have left behind the fairing and put as many things (spares, tools etc) as I can fit in there...


As soon as everything is designed, the plan is to use wood (for the bash plate) and wood or cardboard to make a mockup of the parts and see if the geometry fits ... So far, the 3D of the bike helps a lot ...

Any comments greatly appreciated ...
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Old 02-01-2012, 04:04 AM   #152
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Old 02-01-2012, 04:05 AM   #153
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Old 02-01-2012, 07:29 AM   #154
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I just realized that is a complete set of clutch discs
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Old 02-01-2012, 07:33 AM   #155
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Originally Posted by ArthDuro View Post
I just realized that is a complete set of clutch discs
And a Casio

http://www.anunciadoentv.com/images/...asio_f-91w.jpg
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Old 02-01-2012, 07:56 AM   #156
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haha indeed on the md roadbook motor
but not the same model strap as in your photo hehe

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Old 02-01-2012, 10:05 AM   #157
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I just realized that is a complete set of clutch discs
I couldnt figure out what the hell that was either ..
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Old 02-01-2012, 11:18 AM   #158
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I thought it was weird to have a parachute on the front of the bike.....
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Old 02-01-2012, 12:12 PM   #159
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I just realized that is a complete set of clutch discs
He's almost got a spare bike strapped to the nav tower!
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Old 02-01-2012, 01:30 PM   #160
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Hdpe

HDPE has about 1/3 the density of aluminium and about 1/8 that of steel so you can make it plenty thick before it gets too heavy. I've made chain sliders and guards from it. Easy to work with and can be bent permanently with some heat from a heat gun. Just can't glue it - gotta bolt it (or any mechanical fixing). Welding is possible but I haven't tested in bendy/flexy applications after welding.

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This bracket is made of high density polyethylene. Thats what the guy says. His name is Paco Martinez. He built all the rally kit himself (only the rear tank was bought to JVO) and finished Real Dakar hero with the old Dakar spirit of "do it yourself". The bike wasn't even an enduro but a MX bike.

He says that the KTM guys had been lurking his bracket. He was resigned that they were going to copy and patent it, and he would not see a single rupee.

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Old 02-01-2012, 02:13 PM   #161
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I did a the 24 hours rally last year and I think most of the guys with ATV's used some kind of plastic to protect the differential and the suspension from getting all over the place .. May be it was HDPE plates ...
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Old 02-01-2012, 03:42 PM   #162
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I made my first mock up with delrin which is similar to the stuff crash knobs are made of so pretty strong and has good strength/vibration characteristics. When it catches fire its pretty entertaining apparently .

The water jet cutters I have used can cut it so once I have made final decisions re my tower I may have a crack at making it from delrin and see how it goes.

That would me mark 7 I think !!!!!
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Old 02-01-2012, 05:13 PM   #163
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I made my first mock up with delrin...
Doesn't Delrin crack when bent too far? I made some parts with it and found it slightly brittle. HDPE is impossible to crack.
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Old 02-01-2012, 07:29 PM   #164
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Doesn't Delrin crack when bent too far? I made some parts with it and found it slightly brittle. HDPE is impossible to crack.
I haven't had this happen but there is always a yet. To be honest its more about sourcing it. I know where it gets dumped in a skip in usable sizes and hence free. . which is good for mockups.

The chopping boards I got were a bit flexable and in my application they wouldn't be big enough, hence I'll have to find a source.

The delrin I got was pretty flexable considering its thickness. It may crack in a crash but I think (who knows here) that I'd be more worried about myself in that situation. To this end I plan to make the fairings I'm build attach to the tank in a similar way to neduro, strapping etc so they can move about a bit and hopefully be more able to be put back into position.

If in the case that the bike drops on its side (low speed) for example I would think the tower is less likely to be hit and the fairing is more likely to cop punishment and that impact would be transfered through to the tower. If the tower has some flex and the fairings are not able to move from the mounting the problem just becomes different. If I or someone else was to make a tower that can flex then (as per the previous clip with the hdpe) the fairing needs to aswell. I can't see why it possible to do one without the other, eg, solid (alloy, bolted fairing) or flexible (hdpe/? and a fairing that can move a bit. Its my current thought anyway. Although history states thats may change
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Old 02-02-2012, 02:19 AM   #165
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Originally Posted by ArthDuro View Post
haha indeed on the md roadbook motor
but not the same model strap as in your photo hehe


same same

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