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Discussion in 'Racing' started by wrk2surf, May 4, 2011.
still depends on the length of #1 and #2. And the placement of #2. Mechanical leverage.
But 1:1 is 1:1, regardless of the length of the levers, right? The only thing I can see that matters is the distance of the lights (weight) from the pivot point. Really not trying to be argumentative. Please explain.
EDIT: I was assuming that we were talking about a simple parallelogram linkage. Just re-read what you wrote about the length of 1 and the placement of 2.
Fuse holders are metripack brand. They also sell waterproof connectors. Eastern beaver one seller of both.
Seems like I could have explained a little better, but perhaps you see what I mean. if the lever, #1 & #2, is shorter or longer it will affect the leverage and at some point the lever would be too long and adversely affect the leverage because of the lever weight itself, and of course in this case, the interference with other parts.
Here is an interesting quote from Jake Smith of the GHR Honda team when discussing his 2011 Dakar bike and the 2013 Dakar bike:
Brother Todd Smith's comparison of the (Australasian) Safari bike vs Dakar bike:
Quotes from Jan 2013 Transmoto magazine, some great extra info in their about their Dakar bike setup.
Are you planning on relocating the key barrel? I decided to leave mine in place for my WR250R, that seemed to be a big limitation on how the stem mount was designed. Something to keep in mind...
Heres some of my latest pics.
- Side plates are 8mm HDPE
- 20mm square tube & delrin spacers in between
- 20mm diameter delrin spacers for the top headlight mount.
- Bottom headlight bracket milled from 30mm delrin round bar (certainly did that the hard way) but learned something
- WR450F headlight (mask is a bit bigger than the 250R)
- brake line relocated over the mudguard
- zeta hand guard signals installed into barkbuster guards
- stock wiring plus power lead from the battery runs through a cutout on the left side plate and inbetween the two plates
Still need to sort out the electrics for the nav gear but stock wiring is connected.
Gany that is awesome !!!!
What software do you guys all use to do the engineering pics and fea analysis ?
Can you get it online?
Just a thought... Single centre piece is to save cutting and drilling 2 sides. However, the result of that means that everything you hang off it needs 2 pieces cut - roadbook mount, side plate attachment to the stem, stock instrument mount, fairing mount etc. About 10 pieces overall. This might result in more work overall?
Vs 2 plate design where stock instruments, roadbook, even fairing mount can be single pieces from the middle, Raid Designs style. About 6 pieces overall.
Food for thought?
Read back here at the very bottom
Inventor Professional and Solidworks will allow you to do FEA but more often than not if you don't know exactly what you are doing it can screw you big time. Actually in these parts I would not worry at all as the weight load is minimal and when a crash occurs the loads are so high you can kiss the tower goodbuy ... For example Laia's tower in this dakar broke and had to carry it in her back swapping it between her teamate because it was too heavy :eek1 ... Of course the load has What I am interested in at the moment as far as the Towers is concerned is how to make them collapse if they get hit by the rider, much like AntiPaul did with his first design. That was a very nice feature. As far as the other equipment is concerned you have to make them completely bulletproof. I would prefer to add 200 grams on my roadbook and make sure that is stronger that making it a featherlight unit that gets destroyed with a light touch. You know what I mean...
The subject tha Paul started with an FEA program that will give you hints about the shape, I remeber Designspace from ANSYS which would automatically remove material from the structure. Material that did not do anything as far as the loads and the supports is concerned. You would choose the percentage reduction and it would try and achieve that. Anyways... Back into the Towers ...
@ Tileman, indeed it may be easier to achieve everything with one piece in the middle. That is a great idea. Two parts will always be better as far a weight/torsional stiffness is concerned. Think of I-beams etc. I like the simplicity of it so go forward and get some pics when ready !!
@ Gany, nice ! I always like people trying new things, let us know the stability of this thing. If you push it sideways, does it give way and spring back ? Vibrations? I was thinking about desert and in general summer temps. From what I have seen the PE pipes that I have used before they get soft if you leave them in the sun and then they retain that shape when it gets cold. I am wondering if this will get softer after racing in the sun. Thoughts ?
Keep it coming boys !
The two LED products that I know of right now that are very good are the Squadron supplied by Baja Designs and the Rigid Industries lights. I am sure there are others out there but you can look at those two companies to get a feel for what they offer.
The squadrons are fairly heavy. Mounted direct to the forks there would be some pendulum effect
Nope, you have that wrong, Squadrons weigh in at 12oz ea and the Rigid's are 20oz. The new SII's are half a Squadron and weigh in at 8oz, the spots are incredibly bright, as soon as they come out with a wide cornering lens for them having one spot and one WC will be about perfect for only 16oz. I run 2 Squadrons in that config and it's great for 24oz, just over one Rigid.
As far as pendulum effect, I hardly notice they're there.
Yet to be proven.
8mm is pretty stiff, there is some deflection but it springs back, not sure whether it will vibrate like cheap mirrors and make things unreadable. I will need to load up the roadbook with some weight to see what the wobble is like. Will report back when I give it a shake down test.
All I have read is that the heat deflection temp is 85°C@0.46 MPa (66 psi) and 60°C@1.8 MPa (264 psi) with a melting temp of 130°C. So I guess under pressure and in the sun (particularly black) it is not inconceivable that it would reach temps of up to 60-85 degrees and warp. Perhaps airflow keeps the temps down. I dont plan on racing in the Fiambala! Then again, Paco Martinez raced dakar last year with HDPE tower parts and survived? Time will tell?
Not sure how these compare with visionx or squadrons but damn the price of those 61s by comparison is good. Latest offerings from Sanjoh (advmonster):
Jeremy, materials alone cost about half a new 500XCW, then you need a big enough CNC and software to run it, all the overhead, blah, blah, blah. Free, is kind of stiff, it's like saying "You didn't build that". It's a risk I hope pays off.
Gany, we went out all of yesterday and a few hours last night, mine are only 1/4", just over 6mm and there isn't much as far as vibration and it has no lower attachment point for the tower, all cantilevered off the submt plate, the whole thing.
From Geek's XCW post,
Dimitri, I started looking into the packages that are out there now, wow, makes me feel like I'm in the dark ages with what I have, CosmosExpress/SimulationExpress, if I only had the money for a seat of Catia and Simulia/Abacus!
I have the sqadronds. My opinion is that theyre heavy. Sorry for my opinion.
They're lighter than my lapaz dual hid frame mounts but for a compact no reflector light they're heavy,
Those might be worthwhile looking into, couldn't find the weight and the wattage does not add up to the Cree specs for lumen output. Also look pretty much like a BD knockoff, and didn't see anything about a warranty?
This is an on going issue with designing in your shed. Options keep changing!!!!!!!! The mount on these lights is a bit easier to mount to that the other options. Maybe a higher output version in the future?