Rest In Peace. Nerisa Garcia Ahmad. Born on November 28 1947, departed on January 7 2011

My sorrow always bleeds my heart. Your pains stopped at last, mine just started. My tears dry only
after I rejoin you. I supposed to be at your place not you. I always see you like early morning star.

Nerissa Gliders

In honour of my beloved departed wife, Nerissa Garcia Ahmad, I rename my transportation invention 'Gliding Bridges' in her name to 'Nerissa Gliders' and disclose technical details of the invention to make her name immortal as I believe this invention will become one of the main means of transportation in future. This is because it is green and needs low capital skill.


The invention includes a unique power storage, which is not going be disclosed because it is also a major component of another invention of mine, entitled 'Greener vehicles'. But it includes a replacement, which is an obvious power storage and energy recovery and reuse system.

So what is unique about Nerissa Gliders? It may not need energy most of the times and could generate energy some times, and it can be made to be very very fast.

The theory behind Nerissa Gliders

Figures 1 to 8 used to explain the theory. In figure 1 to move the vehicle from point A to B costs energy because the distance between both points is horizontal and flat. But in figure 2, it doesn’t cost energy because the position of the vehicle at point A is higher than B position by H height. The distance between both points is a slope, S. So in figure 2, the vehicle can roll down at an acceleration of (H/S x g)/second, g for gravity, without costing any energy.

In figure 1 to take back the vehicle from B to A costs the same amount of energy. In figure 2, it also costs energy to take back the vehicle from lower point B to the higher point A. But in the case of figure 2, the energy cost can be reduced by almost 99% in theory. This is because when the vehicle moves from point A to lower point B, most of its potential energy can be recovered, stored and reused to take back the vehicle to A position.

Hardly it needs energy:

In figure 3, as the vehicle rolls down towards B position, it pulls up blocks of loads, which are accumulated on the top as in figure 4. It converts its own weight to reusable potential energy. The vehicle can roll down under gravity as long as a bit heavier than the load, which it pulls up. Obviously the weight of the vehicle is heavier than the weight of the accumulated loads on the top. So to take the vehicle back to the higher point at A, we have to use the accumulated loads and some extra energy. But this extra energy is going to be a lot less than the energy used to take back the vehicle to point A at figure 1. So we travelled from A to B without any energy cost and we came back to point A with a bit of energy cost. That was not bad.

Generates energy:

In figure 5, the vehicle is fully loaded with passengers at A point. When it rolls down to point B, it pulls up all the loads to the higher point at A. This time it also converted the weight of passengers to reusable potential energy. At B, passengers leave and the vehicle becomes empty and lighter. To take it back to the higher point A, we use only the weight of the accumulated loads on the top to pull it back. At the end, when the vehicle pulled back to the top, we will be left with some loads on the on the top as in figure 7. These loads have potential energy. In other words, the vehicle generated energy.

Figure 8 is an idealistic, theoretical, Nerissa Gliders Shuttle Express between Glasgow and London. For simplicity, only one way from Glasgow shown. In Glasgow, the departure point is higher than the arrival point in London by 100.00m. The distance between both points is 500,000.00m. Assume the gravity, g, is 10m/s/s. This lets the vehicle to roll at an acceleration of (H/S)xg= (100/500,000)x10= 0.002m/s/s. According to the formula: ‘Distance = 1/2 x acceleration x (time x time)’, it takes over 6 hours for the vehicle to reach London when it is driven under gravity. But in this situation the vehicle may not move under gravity because the slope of 100/500,000=1/5000 is too small. The friction and wind may not let the vehicle to move.

So the vehicle have to be energised to make it to move. If it is energised, it can be made to reach London under an hour at a fraction of energy and wear and tear costs of a train or an aeroplane between both points. This is because first it moves from a higher point to a lower point, which should help to accelerate to a high speed very quickly. Second, it is very light. The vehicle doesn’t have engine or wheels although in the diagram shown with the wheels. Later you discover, it glides over rollers fixed to the ground on the way. These rollers will act as driving wheels and can act almost like catapults.

Nerissa Gliders as energy generators:

To use Nerissa Gliders as energy generators, The slope between departure and arrival points has to be made sharp enough for the vehicle to glide under gravity. For this purpose, travelling distance may be reduced to 100.00Km or 100,000m and departure point may be made 200.00m high. This gives a slope of 200/100,000=1/500 and a gravity acceleration of (1/500)x10=0.02m/s/s. According to the same formula above, travelling time on a 100.00Km route becomes less than 53 minutes.

The amount of energy produced each time depends on the number of passengers, the vehicle carries. Assume on a journey, the vehicle carries 1000 passengers, with an average weight of 60.00Kg weight each. This gives 60,000.00kg total weight of the passengers. Assume the weight of the vehicle is 20,000.00Kg. So the gross weight becomes 80,000.00Kg, which gives a potential energy of 80,000x200x10= 160.00MJ. Potential energy=weight x height x gravity.

Potential energy of the vehicle is 20,000x200x10=40.00MJ. Assume on the way, half of the potential energy of the vehicle, which is 20.00MJ, needed to drive the vehicle and overcome friction and wind. So at the end of the journey, the vehicle generated 160.00-20.00=140.MJ net energy. To lift up the vehicle to the departure point, needs 40.00MJ + 5.00MJ for friction. Take away this 45.00MJ from net energy generated, which is 140.00MJ, you will be left with 95.00MJ in hand.

Details and operation of Nerissa Gliders in figures:

Figure 9:

Nerissa Glider glides over vertical supports from a higher one towards a lower one under gravity. There are rollers on each vertical support to help gliding operation. The same distance separates each two supports and all supports are fixed on the same straight line.

Figure 10:

Nerissa Glider glides from departure point of a station towards arrival point of a destination station. At the arrival point, Nerissa Glider lifted up to the departure point of the destination station and let to glide back to the same station, where it came from.

The straight lines over supports are imaginaries, they don't exist in practice. The supports on both directions could be directly beside each other practically, but shown separately for clarification. Gross load potential energy of the glider collected and used to lift it up to the departure point of the destination station. The length of the glider is longer than the distance between supports more than two times. This ensures the glider remains on at least two supports always.

Figures 11:

Figure 11 is a symbolic representation of the top of each support. Lower support part made up of upper and lower sections with a gap between them. Lifting means exist in this gap to adjust the height of the support. The upper top made up of safety hook with brake shoes over a row of five wheels, under which is another row of two wheels.

Wheels 1, 2 and 3 are coupled to rotary pump drive shaft. Wheels 4 and 5 are not coupled to the shaft but freely spin around it but both of them are coupled to wheels 6 and 7, which are coupled to push-pull pump drive shaft.

When a glider passes over the support, it operates wheels 1, 2 and 3 to drive rotary pump drive to pump up water to a high point as recovered gross potential energy of the glider. When the glider takes brake, it operates wheels 4 and 5 to operate wheels 6 and 7 to operate push-pull pump drive to pump up water to high point as recovered brake power.

Safety hook with brake shoes used for emergency brake and acts as a safety to prevent the glider falling when one end becomes heavier than the rest.

Figure 12:

Figure 12 is a symbolic representation of the arrangements made underneath of a glider. They are made up of three feet, two lower brakes and two upper brakes, one on each side. There also two turner drivers, one on each side, at the back. These numbers are idealistic. In application, they may be more or less.

When a glider passes over a support, the feet operate wheels 1, 2 and 3 of figure 11. If it has to take brake, the brakes underneath operate wheels 4 and 5 of figure 11. Upper brakes used for emergency brake against brake shoes of safety hook of figure 11.

To move on a straight line or not to move on a straight line? That is a question:

As energy generators, Nerissa Gliders will do best when they move on a straight line between both ends. Although travelling on a straight line, may be very important, it may have to be sacrificed on long distance travels like between Glasgow and London to avoid serious natural obstacles like mountains. Supports of figures 13, 14 and 15 used to change the direction of the move.

Figure 13:

The top of the support stands on rollers R1 and has a cylinder underneath at the centre. The cylinder houses a piston fixed at the centre top of upper section of the support. The top can move clockwise or anti clockwise on rollers R1 around the piston on a predetermined distance, arc..

Figure 14:

Figure 14 is the same like figure 13, except it has a rail, which stands on rollers R2 and the same piston of figure 13 fixed to the centre of it. Now the whole top assembly of figure 13 stands on this rail, which can move on rollers R2 on a straight line forward and backward.

Figure 15:

Figure 15 is the same like figure 14 except it has two turners, one on each side under safety hook and brake shoes. Each turner is coupled to a roller R2.

Turner drives of figure 12 activate turners to drive rollers R2 when the end of the passing glider passes over this support. This drives the top assembly on a straight line to change the direction of the gliders from the back. Turner drives of figure 12 at the back of the passing glider reach turners when the front of the glider passes over figure 14 support and reaches to the top of figure 13 support. When turner drives activate turners, the top assembly of figure 15 and 14 supports make a straight and an arc move. But the top of figure 13 support on the front makes only an arc shape move. This turns the direction of the glider at a predetermined angle at the back.

Oval Shapes
For structural and aerodynamic reasons, passenger carriers of Nerissa Gliders may be made in oval shapes like figures 16 with multi passenger decks inside as in figure 17. In that case, feet and brake assembly goes to each side in the middle and the top of each support changes to become two vertical supports opposite each other as in figure 17. Figure 16 shows side view of an oval shape passenger carrier. Figure 17 shows front or back cross sectional view of the same passenger carrier. Figure 18 represents a possible aerodynamic design to create high terminal velocity or possibly to cross terminal velocity barrier.

Energy recovery and reuse:
Both gliding and braking wheels operate pumps to pump up water to reservoirs at high points as potential energy storages, which can be used as counter weights to lift up passenger carriers to the departure points or used for other uses like generating electricity. This types of energy storages are going to be very big and expensive. Any entity interested in Nerissa Gliders invited to take advantages of my unique power storages, which are very compact and don't cost as much as water power storages.


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(c) 2011 Copy Right of Inventor: R. M. Ahmad,,
We met on 1976
We Married on 1985
We had a son
Our son weds his sweet heart
All four of us on her 60th birthday
Nerissa with our grand daughter on her last days
All five of us on her last days

(c) 2011 Copy Right of Inventor: R. M. Ahmad,,