Hydraulic running.

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SethChester
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Hydraulic running.

Postby SethChester » Mon Jun 22, 2015 12:01 am

I want to know if there is a way to connect a Hydraulic motor & pump to an engine and have the hydraulic motor be able to withstand 3000rpms & over 800+ lbs of torque per inch. I have not found where anyone has done it and I'm ready to put it to the test. If someone answers & I can pull this together I'll inform you.
New project - 11ft | Single Seat Rigging | Continental 4 cylinder.

Bdriller
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Re: Hydraulic running.

Postby Bdriller » Mon Jun 22, 2015 12:59 am

Absolutely, expect a 30% decrease in hp from motor to prop

SethChester
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Re: Hydraulic running.

Postby SethChester » Mon Jun 22, 2015 2:41 am

Bdriller wrote:Absolutely, expect a 30% decrease in hp from motor to prop

How does it decrease by 30%?
New project - 11ft | Single Seat Rigging | Continental 4 cylinder.

Begather
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Re: Hydraulic running.

Postby Begather » Fri Jul 10, 2015 12:54 am

SethChester wrote:
Bdriller wrote:Absolutely, expect a 30% decrease in hp from motor to prop

How does it decrease by 30%?


Did you get the answers yet? I also need that answer for my topic.

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John C
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Re: Hydraulic running.

Postby John C » Fri Jul 10, 2015 5:50 am

It should not be a problem running a hydraulic motor/pump at that RPM. I had a hydraulic pump on a 460 Ford that ran 3000+ RPMS. the unit will rob some power from your motor.


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Deano
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Re: Hydraulic running.

Postby Deano » Fri Jul 10, 2015 9:31 am

SethChester wrote:How does it decrease by 30%?
Begather wrote:Did you get the answers yet? I also need that answer for my topic.

Parasitic drag, generation of heat, mechanical resistance, fluid resistance,
the volumetric efficiency of the drive engine, the volumetric efficiency of the pump, etc etc

The amount of any loss(es) would be contingent on the flow volume and sustained pressure among other things.
There isn't enough info given due to the large number of unidentified variables to arrive at a definitive amount.
However, given BDriller's knowledge of the subject matter, I would expect his guess is a good, educated one.

Try searching these terms, and you can read for yourself:

Hydraulic Power Losses
Drive Train Power Losses
Hydraulic Power Train Losses
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John C
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Re: Hydraulic running.

Postby John C » Fri Jul 10, 2015 12:15 pm

What do you need to run with the hydraulics? If you decide to not use a PTO on the main motor you can get a stand alone unit.

Foster Hydraulics
PHONE: (262) 633-7073
http://www.fostermfgcorp.com/page/gas/b ... 13_hp.html

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Whitebear
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Re: Hydraulic running.

Postby Whitebear » Sat Jul 11, 2015 2:04 am

We used hydraulic pumps and motors in seismic research drill airboats. The engine drives a pump and the pump drives a hydraulic motor. In between there are valves for directional control and for the ratio of coupling. there is also a huge accumulator tank for the hot fluid to return and expand into. I may have seen some coolers on some of them too. I do know that stuff gets damned hot and the hoses aren't your normal automotive heater core hoses. They need industrial hydraulic grade fittings as well as the hose. Oh, and all this stuff is damned heavy too !
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SWAMPHUNTER45
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Re: Hydraulic running.

Postby SWAMPHUNTER45 » Sat Jul 11, 2015 4:48 am

Like said prior you have a lot of unknowns with this but it I can easily be done.

Hell nearly every muscle car has a power steering pump so there is a place to start

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glades cat
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Re: Hydraulic running.

Postby glades cat » Sat Jul 11, 2015 7:18 am

It sounds like you want to turn a prop with this drive system. It will be expensive and heavy.
Something to consider. Anytime you deviate from direct application of force, you have loss. Redirecting power through gears, belts, chains, hydraulic systems, transmissions and any changes of direction, you loose energy. Generating pressure of any kind builds a lot of heat, whether hydraulic, electrical or pneumatic.
As a project, it would be cool to build.
No intention on quenching a hot idea, but there is some homework to be done to make it advantageous to current drive systems.
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