Rubber band energy storage compound bow

Do compound bows store the most energy?

Clearly there are many factors, bow design being dominant, but surely this value can be calculated. It appears that compound bows store the most energy, but how much is actually stored? You can draw the bow with force meter, noting the force at set intervals of distance.

Are twisted carbon nanotubes better than twisted rubber bands?

The advantage of carbon nanotubes over a twisted rubber band, which is used to store energy in popular toys, is their unprecedented toughness. Using ab initio and parametrized density functional calculations, we determine the elastic range and energy storage capacity of twisted carbon nanotubes and nanotube ropes.

How much energy does a rubber band use?

For this particular rubber band, I get a volume of 8.1 x 10 -7 m 3. This would give a rubber band energy density of 2.2 MegaJoules/m 3 for stretching and 8.9 MegaJoules/m 3 for twisting. That might seem like a lot of energy, but remember that gasoline has 34 GigaJoules/m 3.

What is the energy density of a rubber band?

This would give a rubber band energy density of 2.2 MegaJoules/m 3 for stretching and 8.9 MegaJoules/m 3 for twisting. That might seem like a lot of energy, but remember that gasoline has 34 GigaJoules/m 3. Oh, what about the specific energy? Again, this is just the energy stored per unit mass. The rubber band has a mass of 1.09 grams.

Should you wind a rubber band up instead of stretching?

The nice thing about winding a rubber band up instead of stretching is that it doesn't really take up more room as you store energy in it. Also, it releases energy while unwinding in a much more controlled fashion than it would by stretching.

Can a twisted nanotube rope reversibly store energy?

We find that a twisted nanotube rope may reversibly store energy by twisting, stretching, bending, and compressing constituent nanotubes. We find that in the elastic regime, the interior of a twisted rope encounters hydrostatic pressures of up to tens of GPa.