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Bulent Aliev wrote:
In a message dated 7/10/2006 11:43:35 AM Central Standard Time, jesse@jessfarr.com writes:
Have any of you ewp folks looked at CSR Performance products stuff? They
tell me they have a high volume pump that fits into some good looking
anodized aluminum housings for big block car stuff that will pump up to 70
gpm and is expected to last for 5500 hours or so; and, they have a remote
that is something like davies-craig that is also expected to last about 5500
hours and pumps around 35 to 37 gpm. They run in the $250 to $300 range,
supposedly use about 5 or 6 amps; and, I would like to learn from someone
else's experimentation, if possible. <g>
jofarr, soddy tn
Looks like somebody is dreaming in Technicolor. I sell DC pumps on my web site. The smallest 3 GPM pump is using 5-7A and the pump is 3 pounds. Pump that will pump 15 GPM at 12V DC is about 30 pounds and huge motor. There is no free lunch. Pumping 35-37 GPM on 5-7 amps? My transponder needs 7 amps.
Buly
Hi Buly,
No 'drink the koolaid' level of opinion from me on EWP's, but a reality check is in order on the transponder statement. Put an *analog* DC amp meter on the supply line of your transponder. I'd just about bet that it won't read over 2 amps even with it replying once or twice a second. The stated fuse requirement in the manual rarely bares any significant relation to actual need of a solid state device like a transponder.
The ~200 watt output from the xp is for microseconds, followed by many milliseconds of minimal current draw. I'll bet that your comm with 5 watt transmitter uses more power.
On to the pump:
Ignoring pump & motor efficiency, consider the formula for 1 horsepower (~746 watts, or 62 amps @12 volts): 33,000 lbs lifted 1 foot in 1 minute. 40 gallons of water is ~320 lbs. At 1 foot of 'head', that's 0.0097 horsepower. Someone please check my math & be sure I haven't displaced a decimal point; it's late & I'm sleepy. Anyone know the approximate 'head' pressure in feet across the pump in a car engine? Surely we can do a sanity check on approximate hp required to pump the water if we know the 'head' pressure in feet.
Charlie
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