This project is a continuation of my engine models, which is a successor to the 1600 rpm model ( • Motor Stirling, como m... ). With the stroke reduction from 28 mm to 20 mm in the displacement piston, a 15% speed improvement occurred. I also increased the displacement piston length by 20 mm to 25 mm to eliminate part of the engine dead zone.
Meet my mini battle tank: • Mini tanque de guerra ...
My fire eater engine: • Veja como funciona o m...
It has also been reduced from 340 grams to 290 grams total engine weight, very important depending on the application, which I will soon present to you.
In the first test, a big surprise, the engine peaked at 1900 RPM and constant speeds of 1570 RPM. Tests performed in a closed environment without air circulation (without wind), and the water temperature ranged from 65 to 75 ° C.
The first tests on the generator using a NEW 35mm displacement piston were:
4 leds 1179 rpm 3.89 V. 0.083 A = 0.32 Watts
10 leds 1130 rpm 3.43 V. 0.043 A = 0.30 Watts
30 leds 1180 rpm 3.31 V. 0.092 A = 0.30 Watts
These "power" results can possibly be improved by turning on the LEDs in series, just as I presented in the headlamp tank video ( • Mini gerador instalado... ).
MATERIAL LIST:
- 2 cans of soda or beer 350 ml, 68 mm in diameter (6.8 cm), for the hot cylinder and the head;
- 1 (473 ml) beer can, 68 mm in diameter (6.8 cm), as a crankshaft support;
- 2 (830 g) peach cans, 100 mm in diameter (10 cm), for the furnace and the cooling system;
- 1 cap of a 57 mm diameter hair spray can for the working piston cylinder;
- 1 45 mm diameter (4.5 cm) softener cap to make the "outer" work piston cap;
- 1 30 mm (3 cm) diameter Pet bottle cap to make the "inner" cap of the working piston;
- 1 balloon number 9 or 10 for the working piston;
- 1 motorcycle chamber, (discarded in rubber), cut into a strip to wrap around the working piston cylinder in order to secure the balloon;
- 2 money stamps to place around the balloon in the seal on the working cylinder;
- 1 PVC knee of 20, which will be the pipe that connects the two cylinders and at the same time the support of the working cylinder;
- 1 piece of pipe 20 mm (2 cm) in length PVC and 20 mm in diameter;
- 1 roll of “Bom Bril” steel wool, I tested the other brands, but did not get good performance;
- 4 x 2mm bike spokes (known as thin) all in STAINLESS, do not recommend the traditional ones;
- 2 5 or 10 cent coins for the bearings (crankshaft support sleeve);
- 4 CDs for the steering wheel;
- 1 damaged computer CD recorder or DVD player to make the steering wheel;
- 7 (6mm) light wire connectors found in stores selling residential electrical supplies;
- grease, durepox glue, high temperature silicone glue available at auto parts stores;
ENGINE FEATURES:
- Displacement piston stroke: 20 mm;
- Work piston stroke: 14 mm;
- Length of hot cylinder: 85 mm (8.5 cm);
- Head length: 60 mm (6 cm);
- Steel wool piston length: 25 mm (2.5 cm);
- Length of crankshaft support can: 159 mm (15.9 cm);
- Length of displacement piston rod: 93 mm (9.3 cm);
- Length of power piston rod: 115 mm (11.5 cm);
- Cooling system can length: 45 mm (4.5 cm);
- External diameter of cold cylinder: 57 mm (5.7 cm);
- Height of cold cylinder: 30 mm (3 cm);
- Inner cover diameter of working piston: 30 mm (3 cm);
- Working piston outer cover diameter: 45 mm (4,5 cm);
- Crankshaft shaft diameter: 2 mm stainless steel bicycle radius;
- All radii are 2 mm in diameter in stainless steel;
- CDs used on the steering wheel: 4 cd's;
- PVC knee of 20 mm;
- Peak engine speed: 1840 rpm;
- Constant engine speed: 1600 rpm;
- Heat source used: alcohol combustion 92.8 INPM;
TOOLS REQUIRED:
- 1 drill;
- 1 1.5 mm, 2 mm, 2.5 mm, 3 mm and 4 mm drill bit;
- 1 iron saw;
- 1 mini walrus;
- 1 screwdrivers, Philips, nose pliers and a normal hammer;
- 1 plastic ruler or caliper;
- 1 grease;
- 1 a pen;
- 3 nails;
- 1 stylus;
- 1 scissors;
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Thanks to all who follow this trajectory, best regards.
Leandro Wagner.