HorseWhisperer 243 #1 Posted May 15, 2016 Im considering a hydro buggy project and was wondering if a 2 hp heart would be enough to power a sundstrand hydro drive.I have always heard that you lose a couple of horses on the tractor if you have a hydro so a couple horses should drive it ok? Share this post Link to post Share on other sites
N3PUY 1,031 #2 Posted May 15, 2016 Well............ if you start with 2HP and lose a couple you would have "0"HP left. ?????????? 2 Share this post Link to post Share on other sites
AMC RULES 37,134 #3 Posted May 15, 2016 Makes perfect since to me. 1 Share this post Link to post Share on other sites
KC9KAS 4,741 #4 Posted May 15, 2016 1 hour ago, N3PUY said: Well............ if you start with 2HP and lose a couple you would have "0"HP left. ?????????? Start with a 2 1/2 HP so you have some left! 1 Share this post Link to post Share on other sites
pfrederi 17,911 #5 Posted May 15, 2016 Saw a machine at an antique engine show that had a small hit and miss engine running a sunstrand hydro unit from a wheel horse. Had a very large sprocket on the engine and a very small one on the hydro to get the rpm up. The small hit and miss were only rated at 1 or 2 hp. (Lots of torque) Assuming all you have to power is the movement of the buggy and you aren't 300 lbs asking it to go up hill i would think it would move...acceleration would be leisurely. 1 Share this post Link to post Share on other sites
squonk 41,466 #6 Posted May 15, 2016 GO BIG OR GO HOME! 2 Share this post Link to post Share on other sites
rmaynard 15,634 #7 Posted May 15, 2016 Let me see if I understand. It takes 2 HP to run a hydro, and you have 2 HP, and the only purpose of the hydro is the move the buggy, then I'd think 2 HP would be enough. 1 Share this post Link to post Share on other sites
HorseWhisperer 243 #8 Posted May 15, 2016 Im thinking so?Its just a hydro driver. I have plenty of available power sources,just trying to save on size/design.I have the perfect little 2 horse briggs that will fit the spot perfect and it will just be a driver when finished. 5 hours ago, N3PUY said: Well............ if you start with 2HP and lose a couple you would have "0"HP left. ?????????? I have left it all at work before and everyone was happy Share this post Link to post Share on other sites
N3PUY 1,031 #9 Posted May 15, 2016 (edited) 7 hours ago, N3PUY said: Well............ if you start with 2HP and lose a couple you would have "0"HP left. ?????????? BUT.... now you have "0"HP do do any work. Say you started with 10HP, then lose 2HP to run the hydro. Now you have 8HP to move the driver and the tractor. I don't think you can move 500+ pounds with "0"HP. You're not saying it takes 2HP to run a tractor with a hydro .... you're saying you lose 2HP to the hydro .... correct? You need something left over to do "work".(the work of moving the tractor with driver) Edited May 15, 2016 by N3PUY Share this post Link to post Share on other sites
HorseWhisperer 243 #10 Posted May 15, 2016 Its just a driver.No work.It wont resemble a tractor anymore.Just a hydro driver. Share this post Link to post Share on other sites
AMC RULES 37,134 #11 Posted May 15, 2016 Starting to sound like something from here... 2 Share this post Link to post Share on other sites
HorseWhisperer 243 #12 Posted May 15, 2016 Well I guess I will just go do it. 1 Share this post Link to post Share on other sites
N3PUY 1,031 #13 Posted May 15, 2016 I don't mean "work" as in physical labor, or as in moving something. "Work" as in release of energy. Such as making this vehicle move. If you start with 2HP and lose 2HP in the operation of the hydro you'll have "0"HP left to do the "work" of moving the vehicle. This will explain it better ...... "For moving objects, the quantity of work/time (power) is calculated. Thus, at any instant, the rate of the work done by a force (measured in joules/second, or watts) is the scalar product of the force (a vector), and the velocity vector of the point of application. This scalar product of force and velocity is classified as instantaneous power. Just as velocities may be integrated over time to obtain a total distance, by the fundamental theorem of calculus, the total work along a path is similarly the time-integral of instantaneous power applied along the trajectory of the point of application." Share this post Link to post Share on other sites
rmaynard 15,634 #14 Posted May 15, 2016 Wow, this stuff is over my head. I'm sure that if you hitched two horses to the front of your buggy they wouldn't have any trouble moving it, and a couple of other things besides. Share this post Link to post Share on other sites
pfrederi 17,911 #15 Posted May 15, 2016 The two horsepower loss in the hydro isn't a hard verifiable fact so far as I know. Think about it where does the 2 horsepower go. It has to be used up somehow...most likely generating heat. A constant 2 hp heat generation would be a lot of heat to dissipate. Abut 5100 BTUs I believe. Your space heater running flat out....Do our hydros get that hot when they are not being worked hard???. A worn leaky hydro will heat up a lot more than one in good shape. My D200 used to peg the hydro temp meter, (she could barely go up a steep grade) not so after overhaul.... Share this post Link to post Share on other sites
rmaynard 15,634 #16 Posted May 15, 2016 Go for it Kevin. I would like to see what happens. Share this post Link to post Share on other sites
DougC 2,641 #17 Posted May 15, 2016 I hope you post some pictures of your project. I would love to see a 2 horsepower motorized buggy with a hydro. In southern central Iowa the Amish drive buggies and pie carts and let their horses graze in the ditches by the side of the road while they sell their wares. Share this post Link to post Share on other sites
