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electric leaf blower - Page 2

post #11 of 41
Quote:
Originally Posted by Voyager4300 View Post
i once used one to build myself a small hovercraft and i just was looking at some threads where people are looking for fans with ridiculously high cfm. so y not try an electric leaf blower, aside from being loud as hell it does move a good amount of air. not sure how it would do running 24/7 though. im trying to point out to some people that if u want crazy cfm in ur case u gotta think of crazy ideas
http://lib.store.yahoo.net/lib/sidew...GFB1212VHW.avi
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post #12 of 41
Quote:
Originally Posted by DigitrevX View Post
your only going to blow heat off a sink as fast as it can sink so after about 100cfm theres hardly any point. Unless you got some kind of magic metal that sinks faster than copper on your rig.

After about 100cfm the next step is to cool the air or move on to phase.
this can be fixed with a better heatsink right?
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post #13 of 41
Quote:
Originally Posted by metalmodman View Post
this can be fixed with a better heatsink right?
not really. Every metal has different heat exchange properties but I've never heard of any of them that can out put heat fast enough to need over 120cfm. Diamond is supposed to be the best and it’s not even a metal and it still can’t sink heat fast enough.

The only time you need high cfm is if you have a lot of surface area to cool. For example you buy a triple 120mm rad and you put 3x 100cfm fans on it. Thats good, and even though technically its 300cfm total, its being disbursed over a lot of surface area. If you through 3x deltas with 220cfm with a total of 660 its a complete waist and will make a lot of noise and improve very little.

So in short its a balance of the amount of sink and cfm. Most sinks dont do much after 120cfm and most rads don't do much after 100cfm per every 120mm square.
post #14 of 41
I've made a hover craft before the only bad part was you couldn't stear it.

All you do is cut a circular piece of plywood about 3 foot in diameter. Take heavy duty tarp and cover one side of the ply wood.

Leave some slack on the opposite side and then staple and ductape the ends to the opposite side of the ply wood. Cut 1 inch holes around the edges of the tarp about 10 inches from the outside all the way around the circle.

Cut a hole just big enough for a good sized leaf blower in the ply wood.

Start your blower up and stick the end of the tube in the hole. Set the blower to full throttle and stand on the ply wood.

Wadda ya know.. your floating.

It only works well if you have a good sized blower. Since I own a lawn company I have a 44CC backpack leaf blower Echo PB430. Puts out about 800CMF.
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post #15 of 41
Thread Starter 
ya thats very similar in design to the one i made. one problem was balance, u had to stay perfectly balanced or all the air will rush out one section instead of all areas evenly
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post #16 of 41
See if you got a copper heatsink with a very big surface area (Perhaps customised in some way to provide a larger surface area) and fired in a big heavy duty peltier and then bolted a big 220CF delta on top and used that, wouldn't that mean that the delta could cool the heatsink more fficiently than if it were cooling a heatsink dissipating a lower TDP?
    
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post #17 of 41
Quote:
Originally Posted by alk View Post
See if you got a copper heatsink with a very big surface area (Perhaps customised in some way to provide a larger surface area) and fired in a big heavy duty peltier and then bolted a big 220CF delta on top and used that, wouldn't that mean that the delta could cool the heatsink more fficiently than if it were cooling a heatsink dissipating a lower TDP?
Its all about the surface area. I dono what kinda sink your going to find that has enough surface area to make use of a single fan. Biscuit fans like delta's have a tight beam of air so your better off with multiple lower cfm fans for a wider area to dissipate heat from a sink that large. kinda get my drift?
post #18 of 41
hmm so cfm is just a measurement of pressure?

if I understand what your saying you can air cool a peltier with a large heatsink at room temperature? how much surface area are you talking about?

thanks
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post #19 of 41
What if you somehow electroplated a copper heatsink with silver?
    
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post #20 of 41
Quote:
Originally Posted by metalmodman View Post
hmm so cfm is just a measurement of pressure?
Not pressure but flow. CFM = Cubic Feet Per Min. Kinda like pumping 60 gallons of water per min, its how much is flowing not how much pressure, pressure would be in PSI(pounds per square inch)
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