Outmoded Technology: Improved Multi-Blade Blower
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Primitive Technology: Improved Multi-Blade Blower
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About This Video:
In the 6 years since I developed the first forge blower (https://youtu.be/VVV4xeWBIxE) I had made very few improvements to it"s design. So I decided to do some research and development to see if I could improve it"s efficiency. From my research, increasing the number of fan blades from 4 to 8 yielded an increase of 19% volume of airflow. So I set about building a better fan. Instead of splitting the rotor and inserting blades made of bark into it, I made spokes from split cane to hold the blades leaving the rotor intact. This increased the longevity of the rotor as well as the spokes being heavier contributing more momentum, assisting the impeller in winding back in the other direction after each rotation. Instead of bark being used to for the blades, simple (and easier to find) folded leaves formed the blades. These, being flexible, are less likely to break against the walls of the housing as stiff bark does. Finally, a lid was added to the housing to make maintenance easier. The new blower works better than the old one with more airflow occurring. I experimented with different numbers of blades on the impeller (4,6 and 8). The more blades used, the slower the impeller can be spun to produce the same airflow. This makes it easier to operate as the users arms don"t have to move as quickly, making it more ergonomic. This conservation of effort will be important in iron smelting later.
About Primitive Technology:
Primitive technology is a hobby where you build things in the wild completely from scratch using no modern tools or materials. These are the strict rules: If you want a fire, use a fire stick - An axe, pick up a stone and shape it - A hut, build one from trees, mud, rocks etc. The challenge is seeing how far you can go without utilizing modern technology. I do not live in the wild, but enjoy building shelter, tools, and more, only utilizing natural materials. To find specific videos, visit my playlist tab for building videos focused on pyrotechnology, shelter, weapons, food & agriculture, tools & machines, and weaving & fiber.
#PrimitiveTechnology #MultiBladeBlower #Pyrotechnology
Transcription
Straight stick for the rotor Cutting rotor 50 cm long with sharp stone Shaving off bark Carving a notch for the string Fire sharpening rotor end Finished rotor Fallen branch from the bark fiber tree Stripping the bark from the branch Soaking bark fiber over night to make it more workable.
Stripping the inner bark to form thin ribbons Getting lawyer cane Cutting the lawyer cane into 25 cm lengths to form the spokes of the impeller Splitting the cane to form spokes Lashing the spokes to the rotor with bark fiber ribbons 3 more pairs of spokes were attached in this way Spokes splayed out to form a "wheel" on the rotor A leaf is folded to form a square fan blade. Leaves are flexible and will not break if they hit the side of the blower housing (previously I used stiff bark that would often break in this way) The leaf blade is inserted into the split spoke thusly.
A total of 8 blades are now on this impeller Making cordage from the bark fiber ribbons. Twist the individual strands one way and then back together the opposite way so that they won't unravel Tying the ends of the spokes closed with cordage. This both holds the blades in the spokes and keeps the spokes an equal distance apart at the same time. Completed impeller Carving the bearing block from stone. The impeller spins in this during operation. Demonstrating the simple string drive technique I developed. A string is laid in the groove in the top of the rotor and is wound up and pulled outward. The device spins one way then, due to it's momentum, winds the string back around it again before being spun in the opposite direction. This effect works especially well now with the heavier spokes of my new impeller design Getting clay for the new blower housing Crushing up old fired bricks to act as "grog" (a material that stops clay from cracking during drying and firing). Then mixing it into the clay.
Making the blower housing. I have found from trial and error that the optimal size for the housing is 30 cm in diameter (slightly less internal diameter) to accommodate a 25 cm diameter impeller. The spout coming from the edge of the housing is formed by a roughly equilateral triangle 12.5 cm to a side. Forming the walls of the housing For the spout use a log about 6.25 cm in diameter to form the clay around. The total height of the housing walls will be 12.5 cm high from the ground (to accommodate 6.25 cm tall impeller blades, ensuring plenty of clearance). Cutting a hole 6.25 cm wide in the center to hold the bearing block. Taking the log out of the spout once dry Making a lid for the housing (30 cm in diameter) Molding the housing to the lid while wet (to ensure a better fit) Cutting the air hole in the center of the lid (6.25 cm wide).
Making a tuyere (air pipe) to convey air from the blower to the fire's fuel bed during operation. The base is wide enough to cover the spout and narrows to about 3 cm at the hot end. Drying the clay components near a fire Wet clay is put into the hole in the base of the housing. Then the bearing block is seated into this clay (this is done so that the block is replaceable when the hole becomes too deep with use). The sharp end of the impeller is placed into block and the lid place over the rotor so that the notched end is sticking out of the air hole in the lid The string is placed in the notch and wound around the rotor Then the blower is operated thusly, sucking air in through the hole in the lid and out through the spout regardless of which way the impeller spins. The force airflow makes the fire burn hotter than by natural draft alone. Combining the blower with the tuyere delivers the air straight into the fuel bed, concentrating the combustion at a small point. I recommend firing the clay housing when possible. Any leaks in the huts roof during a heavy rainstorm could dissolve an unfired blower housing undoing all the precision work that went into making it. If you're only firing small pieces of pottery at a time, fill the rest of the empty kiln with unfired bricks. They often come in useful later and are easy to make.
They also protect the finer pottery above from sharp changes in temperature due to a greater thermal inertia. This firing took about 2 hours. I knew it was done when I could see the blower housing glowing at least red hot, meaning it will not dissolve in water afterwards as unfired clay does. The bricks are stored for the hut I built in the previous video. Again, unfired clay is used to seat the stone bearing block in the bottom of the housing (so it can be replaced in future when it wears out). 3 impellers were made (4,6 and 8 bladed ones from left to right) 4 blade impeller The impeller needs to be spun at a high rate to maintain a decent airflow 6 blade impeller The impeller doesn't need to be spun as fast to maintain good airflow due to the greater blade area.
8 blade impeller The 8 blade impeller maintains the same airflow at a far more leisurely pace. There is more torque to overcome but it feels more ergonomic as the arms don't have to move as quickly. I think 6 to 8 blades is optimal. Adding more blades after this yields diminishing returns. Back at the new brick and tile hut... Preparations for metallurgy are being made
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Author: Author Link: Youtube Link: https://www.youtube.com/watch?v=fR9u2oLHFN8 Category: Channel Name: Primitive Technology Channel ID: 28 Tags: primitive,improved,blower,multi blade blower,multi-blade blower,rotor,pyrotechnology,bark,blades,spoke,impeller,primitive,technology,primitive technology,youtube primitive technology,primitive technology youtube,building a multi blade blower,primitive technology pyrotechnology,pyrotechnology primitive technology,primitive tech,bow drill,forge blower,fire,primitive technology fire,rotary fan,clay,primitive technology clay,furnace,mud furnace,bloomery,primitive technology improved,
7 thoughts on “Outmoded Technology: Improved Multi-Blade Blower”
“Preparations for metallurgy” is the identical of the Surprise after credit scene!
You would possibly perchance perchance add a foot pedal to that drill half. When you defend a flat strip of wood and place a hole within the middle, then jog the stick half of the drill threw. Wrap the string one day of the stick, similar to potentialities are you’ll perchance perchance in most cases when using it. Then connect both side of the string to both side of the wood strip half.NOW potentialities are you’ll perchance look that if you push the wood strip down the stick, the strings will gallop it and twist one day of the assorted manner and get the wood strip motivate up the stick all any other time. Allowing you to actual defend pushing it down on a rhythm.So for those that prop up the fan half and lay a foot pedal on the wood strip half. Your foot can also attain the final work whereas you sit.Additionally a flywheel at the bottom of the drill will prolong the gallop of the gallop.
It feels similar to you’d like some manner to automate kinetic power. Treasure this blower, shall we embrace. All you'd if truth be told desire is some rotational power, ethical? Why now not admire a puny water wheel or one thing? That'd doubtlessly attain the trick.
Hello man! Been following you for few years now , colossal movies and colossal engineering there! One quiz tho, attain you ever obtain any injuries whereas crafting all these items?
Metallurgy – industrial 1.0 to 4.0. Excellent
Damn bro, this new minecraft model appears to be like fire.
The inlet hole in lid appears to be like relatively puny? Not definite for those that've examined in past?Great experience your travails