Like I said on Project Log 16:

The text gets deleted every time I add something.

So, basically, at the end, the text is cut out.

But, in summary, the informations that got deleted are:

You can't make an electric motor actuate an hydraulic pump at 1000 RPMs, because when you increase the RPM, you decrease the torque.

So, it would be more or less 200 rpm.

This is bad and good, bad because I won't be able to make a fluid flow of 900 liter per minute, but I can use cheaper and smaller electric motors that have reduction gears.

The recalculation of the pump, counting the space the piston rods occupies on the two motion cylinders gives 15 liters per minute at 3 bars in total. This accound the 5 cylinders used as hydraulic pumps.

Edit²:

Obviously, the pump wouldn't be 100% efficient, so we can cut that flow to lower values, around 10 or 8 liters per minute.

Edit¹:

As you can see in the video, torque/horse power, speed and energy consumption can vary a lot.

If I where to use the big 3 hp 300 watts motor, I would definitely be able to supply the 900 liters per minute without the need of hydraulic accumulators.

But, as you can imagine, it requires more energy, it weights more and it is much more expensive.

And I'm trying to make this thing under a budget, because, you know, I'm broke.

And to worsen things more, I'm almost reaching the maximum weight of the mech. Even though all the muscles can lift at least 5 tons.

As you can expect, everything has weight. All the hydraulic fluid is around 150-200 kg (including the hydraulic accumulators, the batteries, the electronics and the pilot would weight 150 to 200 kg (or even more). I don't know how much the endoskeleton will weight, but a structure that can hold 1 ton will definetly be heavy as heck. At best scenario, 200 kg (if I don't use composite materials, just steel tubes).

So... 600-800 kg in total, even though there are more muscles on the torso and lower part of the body, would it even be able to lift itself?

I mean, there are 6 muscles on each thigh and each leg, each muscle can lift 5 tons... So... 120 tons in total... If we take the general mechanical disadvantage where each muscle would lift just a fifth of its total strength, we would get... 24 tons...

Now that I think about it...

Maybe a 3hp that weights 20-50kg and consumes 3000 watt/hour may not be that... Difficult?

There must be something wrong with my calculations, if it was this easy to lift this amount of weight, we would have seen more mechs out there.

There must be something wrong...