Apr 112014

Update: Through a painstaking update to the Espoo internals, this problem has been essentially eliminated. Ignore the comments below.

When you’re holding button 6 (or RB), Pokey should release automatically when the parabola passes through the cross hair. The problem is the at it is not perfectly precise. This is due to details on how a digital computer simulates physical systems.

However it possible to account for the imprecision. You may notice that the auto release always releases the projectile just a little bit late. If you account for this lateness in your aim, then you might be more successful.

Return to the Espoo page.

Apr 032014

Are you having difficulty deriving mathematical expressions for the coefficients to the parabola? These two videos may help.

First, we’ll start with the case where the balloon provides buoyancy which exactly cancels the weight of the projectile. In doing so, I hope you see how to solve it with and without buoyancy.

After determining the “parabola” for the case when B=1 as described in the video above, I hope that you are now ready for the general case of a parabola with or without buoyancy.

If you still have some lingering confusion, you can consult the following video (coming soon).

Return to Espoo Help.

May 032013

When you reach the end of the line… not the dead end, but the real end, you have one more thing you’re going to need to accomplish. You will need to fit your spuCraft into the small purple box, and keep it there, without touching any of the walls. To do this, you will need to lose almost all your energy. You do not need a trigger. You can lose energy manually.

May 012013

When you first latch onto the swingling, a billboard states: “Find the end of the line… but which end?” The fact that you got to the dead end means that you are at the wrong end of the line and that you have to go to the other end.

So how are you going to get to the other end, when the conveyor belts are moving the wrong way?

Well… Here’s my advice to you. Do you see the orange and blue striped square? If you swing your third mass directly past the square, then the countdown ticks down. When the countdown reaches zero, something special happens.


Feb 272013

I purposely hid that information from you. And if you look at the value of y when the spuCraft is near the bridge, you’ll see that I really went out of my way to hide that information from you.

I don’t want you to use the bridge height… so you can’t. And you don’t need it.

Think about the Lift challenge. In Lift, Pokey starts from rest then falls because of gravity. Then, a short time into the fall, it gets a net constant upward force, which slows down the descent and eventually turns the spuCraft around. To solve that problem, you did not need to know the initial height of Pokey. You could use the height and velocity of the spuCraft at some point along the way. Right?

If you think about it, the trajectory of the spuCraft in FreeFall is very similar. Just like lift, I’m not giving you the initial height of the spuCraft. I am giving you the (current) height and velocity of the spuCraft at all points along its trajectory, after it has moved a certain distance from the bridge.

Return to FreeFall Help.