Recent content by crank

That's true... but at least the impulse can be calculated for a worst case scenario (all at once). I might be able to perform an iterative calculation by assuming an initial structural design, then determining the deflection based on MAX yield stress, and use that deflection as the design...

Huh... then there's no real point of trying to calculate it - is there? For every tenth, hundredth, thousandth, etc... of a second that I'm off - it significantly affects the resulting Force by the inverse magnitude - which becomes quite large.

It is a practical problem that I'm trying to solve. I thought that there was a way to integrate something (impulse or momentum?) to determine the time. It's been years since I've done this sort of calculation and it has escaped me. Are you sure that it can't be done without estimating a time?

Here's my situation... I have a loader dumping rock onto a proposed screening rack to separate stone sizes. The typical load is estimated at 4100kg and falls about 1m above the screen. My velocity at impact works out to about 4.4m/s just before impact (determined by SQRT(2 x 9.81m/s^2 x...

I'll take a stab at it, but I'm no electrical engineer. It appears to be all unit cancellation. So first, covert all of your units so they're the same. So: 3.2 MJ = 3,200,000J 1282J/6s = 769,200J/h Then you solution should be J/(J/h) = h So your estimated run time should be: 3,200,000J...

-=bump=- What I really need to know is how to calculate how long the battery will last each ride. Let's assume a 4.4Ah rated battery and pushing 13.2V. The ballast draws 13.2V@14W - so that's 1.06Amps, right? So the battery should last 4.4Ah/1.06A = 4.15h, right?

I'm not looking for criticism, I'm looking for support. The bottom line is that I need a bright light. My rides are typically 2-3 hours long. So this lamp should last for 160 - 250 rides - that's three to five years worth of "night" riding. It's plenty. What I really need to know is how to...

Yes, I agree. There are many LED systems out there, but nothing compares to the brightness of an HID. Nothing. With regards to weight, these lights appear to be quite small (1 - 1/2" to 2" in dia.) Do you know of any other HID light suppliers that might be smaller? Remember that $200 is "sort...

According to the ballast assembly drawing on their website, the light and ballast are compatible. HID headlamp assemblies typically retail from $200 - $1000. So I thought it'd be a fun project to build my own and get exactly what I want as opposed to comprising. I want to eventually branch...

I'm planning on building a mountain bike light. I thought it'd be a good little project to get me into understanding electrical circuits and I want to know if my parts are compatible. Can anyone see any flaws? Light Specs Supplier WelchAllyn Part Number M10P004 Cost $46.00...

megashawn: Was the craft a mirrored cone? :rolleyes: I saw something like that on discovery, where they used a laser pointed into the cone. The mirror reflects the beams to a focal point which heats up the air, and then you hear a freaking loud "pop" :surprise: and the cone takes off into...

Cliff_J: The ground around the area of the motor is very dense/packed - dirt/clay/gravel. I don't know how to compare it, but like a fairly smooth, hard packed hiking trail. As we move away from the motor the ground does become softer with gravel and sinking is an issue; however, we can...

Don't know if this helps but... Here's a link to the catalogue that I'm choosing my casters from: NOTE: You need Adobe Acrobat or a .PDF veiwer to read it. :devil: http://www.algood-casters.com/catalogue/Algood_Catalogue_Y2K2.pdf When it opens, The castor I'm looking at is the...

faust9: I've tried several attempts at using statics to solve this but, I'm really confused, :rolleyes: I'm afraid that I'm coming up with bad figures. The statics text that I'm using is based on building construction and I can't locate a simular example. :confused: faust9 & brewnog:I've...

Link To Larger Diagram Turin: I know, but this site wouldn't let me upload unless it was a 400x400 pixel image. So I uploaded a larger image for you here. :wink: http://ca.f1.pg.briefcase.yahoo.com/jalbes brewnog: Good point, I never even thought of that. :rolleyes: The ground will...