dude

http://sfbay.craigslist.org/eby/cto/3788876652.html

May 14, 2013 03:44:31 PM, di.franco@aya.yale.edu wrote:
I'm still figuring it out as I play with options.
>I'd spend up to $10k if I can figure out how to make something I'd actually want to drive regularly. Don't think I'd need to go over $5k though even with pretty fancy hydraulics. My sense so far anyway, assuming very economical frame and ancillaries. hydraulicinnovations.com's chopper was around $3k I think off the top of my head.
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I'm also trying to modularize the thinking somewhat so cost / performance can scale up / down, somewhat similar to wikispeed.
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>On Tue, May 14, 2013 at 3:39 PM, Hol Gaskill hol@gaskill.com> wrote:
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>how much are you looking to spend on this project overall?
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May 14, 2013 11:27:08 AM, di.franco@aya.yale.edu wrote:
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I've seen small displacement ones amounting to about 13 HP sustained capacity for a couple hundred. That's enough for highway speeds, barely, with good aerodynamics.
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Would like to find something capable of 40 GPM at around 2000 PSI, 3K RPM for pump, 1500 RPM for motor, very roughly, to be in the same ballpark as a mid-performance car.
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>On Tue, May 14, 2013 at 11:23 AM, Hol Gaskill hol@gaskill.com> wrote:
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>what is a good price for one of those and what prices have you seen so far?  will it be prohibitively expensive?
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May 14, 2013 10:40:38 AM, di.franco@aya.yale.edu wrote:
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Sweet.
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>Let me know if you come across a good value variable displacement pump or motor.
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>I'm not having an easy time finding those on surplus center and they're well-suited to vehicle applications.
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Proportional/servo valves as well, likewise.
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>On Tue, May 14, 2013 at 10:36 AM, Hol Gaskill hol@gaskill.com> wrote:
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>Just throwing out a few ingredients for cost estimation purposes.
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HYDRAULIC POWER
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Complete Hyraulic power unit $299
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http://www.northerntool.com/shop/tools/product_200329758_200329758?cm_ven=natural&cm_cat=netconcepts&cm_pla=Google&cm_ite=https%3A%2F%2Fwww.google.com%2F%26
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vs
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11GPM 3000PSI hydraulic pump - $90, would need a motor and coupling, or a clutch/gearing to use power from an engine
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http://www.amazon.com/Hydraulic-Gear-Pump-2-Stage-Brand/dp/B009OXYYS8/
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Hydraulic motor $125
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http://www.amazon.com/Chief-Hydraulic-Replacement-Char-Lynn-Diameter/dp/B00C2TMBZY/
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1.5" bore, 10" stroke - $50
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http://www.amazon.com/Mighty-Double-Acting-Hydraulic-Cylinder/dp/B00BGZ9VNU
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2.5" bore 14" stroke - $60
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http://www.amazon.com/Mighty-Double-Acting-Hydraulic-Cylinder/dp/B009LQIXJ4/
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this doesn't include valves - there are manual and solenoid easily available but I would like to also develop a standard servo-actuated ball valve
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