Just read this...thought it  would be best shared...

ABOUT BALSA WOOD.
Model airplanes are no different than any other type of flying machine, large or small - THE LIGHTER IT IS BUILT, THE BETTER IT WILL FLY! With that in mind, it is easy to understand why balsa wood has been the standard material for model airplane construction since it first became readily available in the U.S. in the late 1920s. Its outstanding strength-to-weight ratio enables hobbyists to construct durable models that fly in a totally realistic manner. Balsa also absorbs shock and vibration well and can be easily cut, shaped, and glued with simple hand tools.

WHERE DOES BALSA WOOD COME FROM?
Balsa trees grow naturally in the humid rain forests of Central and South America. Its natural range extends south from Guatemala, through Central America, to the north and west coast of South America as far as Bolivia. However, the small country of Ecquador on the western coast of South America, is the primary source of model aircraft grade blasa in the world. Blasa needs a warm climate with plenty of rainfall and good drainage. For that reason, the best stands of balsa usually appear on the high ground between tropical rivers. Ecquador has the ideal geography and climate for growing balsa trees. The scientific name for balsa wood is ochroma lagopus. The word balsa itself is Spanish meaning raft, in reference to its excellent floatation qualities. In Ecquador it is known as Boya, meaning buoy.

HOW DOES BALSA WOOD GROW?
There is no such thing as entire forests of balsa trees. They grow singly or in very small, widely scattered groups in the jungle. For hundreds of years, balsa was actually considered a weed tree. They reproduce by growing hundreds of long seed pods, which eventually open up and, with the help of the wind, scatter thousands of new seeds over a large area of the jungle. Each seed is airborne on its own small wisp of down, similar to the way dandelion seeds spread. The seeds eventually fall to the ground and are covered by the litter of the jungle. There they lay and accumulate until one day there is an opening in the jungle canopy large enough for the sun's rays to strike the jungle floor and start the seeds growing. Wherever there is an opening, made either by a farmer or by another tree dying, balsa will spring up as thick as grass. A farmer is often hard put to keep his food plot clear of balsa. As the new balsa trees grow, the strongest will become predominate and the weaker trees will die. By the time they are mature, there may be only one or two basa trees to an acre of jungle.

HOW LONG DOES IT TAKE A BALSA TREE TO GROW?
Balsa trees grow very rapidly (like all pesky weeds). Six months after germination, the tree is about 1-1/2 inches in diameter and 10 - 12 feet tall. In 6 to 10 years the tree is ready for cutting, having reached a height of 60 to 90 feet tall and a diameter of 12 to 45 inches. If left to continue growing, the new wood being grown on the outside layers becomes very hard and the tree begins to rot in the center. Unharvested, a balsa tree may grow to a diameter of 6 feet or more, but very little usable lumber can be obtained from a tree of this size. The basla leaf is similar in shape to a grape leaf, only a lot bigger. When the tree is young, these leaves measure a much as four feet across. They become progressivly smaller as the tree grows older, until they are about 8 - 10 inches across. Balsa is one of the few trees in the jungle which has a simple leaf shape. This fact alone makes the balsa tree stand out in the jungle.

THE PERFECT NURSE!
Nature evidently designed the balsa tree to be a "nurse tree" which would protect the slower-growing species of trees from the scorching jungle sun during their critical early years. For instance, in an area of the jungle that has been ravaged by a tropical storm or other natural disaster, the balsa trees will quickly sprout and begin to shoot up to impressive heights in a very short time. Their fast growth, and the extra large leaves they have in their early years, provide shade to the young seedlings of the slower-growing forest giants. By the time the seedlings are established enough to take care of themselves, the balsa tree is beginning to die. Undoubtably, the balsa tree's rapid growth, fast spreading crown of first very large and gradually smaller leaves, and it's relatively short life span were intended to make it the "perfect nurse" in the jungle ecosystem.

HOW ARE BALSA TREES HARVESTED?
While nature intended the balsa tree to be a short lived nursemaid, mankind eventually discovered that it was an extremely useful resource. The real start of the basa business was during World War I, when the allies were in need of a plentiful substitute for cork. The only drawback to using balsa was, and still is, the back breaking work that is necessary to get it out of the jungle. Beacause of the way the individual balsa trees are scattered throughtout the jungles, it has never been possible to use mass production logging procedures and equipment. The best way to log balsa trees is to go back to the methods of Paul Bunyan -- chop them down with an axe, haul them to the nearest river by ox team, tie them together into rafts, and then float the rafts of balsa logs down the river to the saw mill.
The logging team usually consists of two native Ecquadorians, each armed with a broad Spanish axe, a machete, and a long pole sharpened like a chisel on one end for removing the bark from the downed trees. Because of the hilly terrain, an ox team may only be able to drag two logs to the river per day. At the saw mill the raw balsa is first rough cut into large boards, the carefully kiln dried, and finally packed into bales for shipment to the U.S. via ocean freighter. Final cutting and finishing of our model aircraft balsa is done right here at the factory. As a result of the balsa tree's fast growth cycle, both the quality and lightness of the lumber obtained from a balsa tree can vary enormously depending upon the tree's age at the time of cutting.

WHY IS BALSA WOOD SO LIGHT?
The secret to balsa wood's lightness can only be seen with a microscope. The cells are big and very thin walled, so that the ratio of solid matter to open space is as small as possible. Most woods have gobs of heavy, plastic-like cement, called lignin, holding the cells together. In balsa, lignin is at a minimum. Only about 40% of the volume of a piece of balsa is solid substance. To give a balsa tree the strength it needs to stand in the jungle, nature pumps each balsa cell full of water until they become rigid - like a car tire full of air. Green balsa wood typically contains five times as much water by weight as it has actual wood substance, compared to most hardwoods which contain very little water in relation to wood substance. Green balsa wood must therefore be carefully kiln dried to remove most of the water before it can be sold. Kiln drying is a tedious two week process that carefully removes the excess water until the moisture content is only 6%. Kiln drying also kills any bacteria, fungi, and insects that may have been in the raw balsa wood.

HOW LIGHT IS KILN DRIED BALSA WOOD?
Finished balsa wood, like you find in model airplane kits, varies widely in weight. Balsa is occasionally found weighing as little as 4 lbs. per cu. ft. On the other hand, you can also find balsa which will weigh 24 lbs or more per cu. ft. However, the general run of commercial balsa for model airplanes will weigh between 6 and 18 pounds per cu. ft. Eight to twelve pound balsa is considered medium or average weight, and is the most plentiful. Six pound or less is considered "contest grade", which is very rare and sometimes even impossible to obtain.

IS BALSA THE LIGHTEST WOOD IN THE WORLD?
No! Most people are surprised to hear that botanically, balsa wood is only about the third or fourth lightest wood in the world. However, all the woods which are lighter than balsa are terribly weak and unsuitable for any practical use. The very lightest varieties don't really resemble wood at all, as we commonly think of it, but are more like a tree-like vegetable that grows in rings, similar in texture to an onion. It is not until balsa is reached that there is any sign of real strength combined with lightness. In fact, balsa wood is often considered the strongest wood for its weight in the world. Pound for pound it is stronger in some respects than pine, hickory, or even oak.

SELECTING BALSA FOR MODEL BUILDING
Most hobby shops have a large rack of balsa sheets, sticks, and blocks that you can choose from if you are going to build a model airplane from scratch. Undoubtably, because of the nature of balsa, the actual weight of each piece of wood of the same size can vary slightly. When you select the pieces you want to buy you should keep their final use in mind. Logically one should select the lightest grades for the lightly stressed model parts (nose blocks, wingtip blocks, fill-ins, etc.) and the heavier grades for important load bearing parts of the structure (spars, fuselage stringers, etc.). To a large extent, this selection is already partly done for you. We purposely cut up our lightest raw balsa into blocks, and our hardest raw balsa into sticks. Sheets are cut in the entire wide range of density.

COMMON MODELER'S TOOLS FOR CUTTING AND SHAPING BALSA WOOD
Balsa is a very "friendly" wood to work with -- so light, so soft, so easily worked into so many things. You don't need heavy-duty power saws and sanders like you would if working with a hardwood. In fact, even with an extensive power shop at their disposal, the professional model builders find that they still rely primarily on 4 or 5 simple hand tools for the majority of their work. If you are just starting out in the model airplane hobby, here are the tools that they recommend you get:
X-ACTO No. 1 knife with No. 11 blade for general cutting; X-ACTO No. 2 knife with No. 26 blade for carving; Razor saw for cutting thick sizes of wood; Razor plane for shaping; A knife or razor blade will work well for cutting balsa sheets and sticks up to 3/16". Always keep replacement blades on hand - blades do wear our and a dull blade can make it impossible to do a good job.

YOU WILL ALSO NEED SANDING BLOCKS
In addition to the cutting tools, you will need an assortment of different size sanding blocks. These are indispenable tools for model construction. You can buy ready-made sanding blocks or make your own. The most often used general-purpose sanding block in our model shop is made simply by wrapping a full 9" x 11" sheet of sandpaper around a 3/4" x 3" x 11" hardwood or plywood block. Use three screws along one edge to hold the overlapped ends of the sandpaper in place. Use 80 grit garnet sandpaper on the block during general construction. Another handy sanding block to have can be made by gluing 80 grit garnet sandpaper onto a 24" or 36" long piece of aluminum channel stock. Most hardware stores carry a rack of aluminum in various sizes and shapes. This long sanding block is very helpful for shaping leading and trailing edges, and other large pieces, accurately. Last but not least, glue sandpaper onto different sizes of scrap plywood sticks and round hardwood dowels. These are handy for working in tight places and for careful shaping where a big sanding block is too hard to control.

BALSA GRAIN -- LEARN HOW TO IDENTIFY ALL THREE GRAIN TYPES
In selecting balsa sheets for use in your model, it is important to consider the way the grain runs through the sheet as well as the weight of the sheet. The grain direction actually controls the rigidity or flexibility of a balsa sheet more than the density does. For example, if the sheet is cut from the log so that the tree's annular rings run across the thickness of the sheet (A-grain, tangent cut), then the sheet will be fairly flexible edge to edge. In fact, after soaking in water some tangent cut sheets can be completely rolled into a tube shape without splitting. If on the other hand the sheet is cut with the annular rings running through the thickness of the sheet (C-grain, quarter grain), the sheet will be very rigid edge to edge and cannot be bent without splitting. When the grain direction is less clearly defined (B-grain, random cut), the sheet will have most intermediate properties between A and C grain. Naturally, B-grain is the most common and is suitable for most jobs. The point to bear in mind is that whenever you come across pure A-grain or C-grain sheets, learn where to use them to take best advantage of their special characteristics.

A-GRAIN sheet balsa has long fibers that show up as long grain lines. It is very flexible across the sheet and bends around curves easily. Also warps easily. Sometimes called "tangent cut." DO use for sheet covering rounded fuselages and wing leading edges, planking fuselages, forming tubes, strong flexible spars, HL glider fuselages. DON'T use for sheet balsa wings or tail surfaces, flat fuselage sides, ribs, or formers.

B-GRAIN sheet balsa has some of the qualities of both type A and type C. Grain lines are shorter than type A, and it feels stiffer across the sheet. It is a general puropse sheet and can be used for many jobs. Sometimes called "random cut." DO use for flat fuselage sides, trailing edges, wing ribs, formers, planking gradual curves, wing leading edge sheeting. DON'T use where type A or type C will do a significantly better job.

C-GRAIN sheet balsa has a beautiful mottled appearance. It is very stiff across the sheet and spits easily. But when used properly, it helps to build the lightest, strongest models. Most warp resistant type. Sometimes called "quarter grain." DO use for sheet balsa wings and tails, flat fuselage sides, wing ribs, formers, trailing edges. Best type for HL glider wings and tails. DON'T use for curved planking, rounded fuselages, round tubes, HL glider fuselages, or wing spars.

 

 

 

  

Wonderful information buddy ......
I was thinking Is balsa now really an essential wood for flying? Because
a) Now we have so powerful motors and Engines available that can fly almost any piece of Ply.
b) Less available & costly wood.
c) Does'nt exhibit any unique property which another easily available wood shows.
d) With better and smart construction, one can build a model with normal ply which will be little heavy than a balsa one.

All I want to say isnt Balsa is now like Elephent Tusk.....costly and rare. Better go for easy and convenient woods.

Wecome your views   

Balsa tree in Costa Rica

Quote from: asinghatiya on April 11, 2012, 01:31:28 PM
c) Does'nt exhibit any unique property which another easily available wood shows.

which easily available wood are you comparing it with

Though the intention is right, kindly be more judicious while copy-pasting contents from other sites. Even when so compelling, do give the due credit to the original source:

http://www.mat.uc.pt/~pedro/ncientificos/artigos/techbal.html

This would in the benefit of this humble forum which could be held hostage for Plagiarism .
Remember, many sites/author are protected by technologies like 'CopyScape', even when they done advertise. Within hours of you posting such contents, they would come to know it and may not like in the right spirit.

Yep, always attribute the source.

i got this from  a post on FACEBOOK...... could not get a link for that so copy edit and  pasted...!

Printing on BALSA
http://www.parmodels.com/Using%20Iron-On%20Transfer%20Paper/Iron-On_transfer_paper.htm

http://www.parmodels.com/Printed%20Balsa/Printed_Balsa.htm

Selecting Balsa for models
http://www.dave-cushman.net/aircraft/balsa_selection.html

[Different Cuts


Cut A or Tangent Cut


Cut B or Random or Mixed grain cut


Cut C or Quarter grain or Quarter sawn


Cross Cut or filler balsa




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OFF Topic Discussion
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There are some loop holes of the CopyScape program too.

At least I can display the same content though not same.

Just copy the entire materials im any word processor like openoffice or MS office.
Replace all SPACE with Alt+255 Character. (Looks like Space but not space, character of Extended ASCII Character.)
Again Copy and paste in any forum. Even you cannot find with google or any search engine.

In my college days, with QBASIC1.1 (without compilation facility, has to run program in command line with /run switch) make alt+255.BAT and called in autoexec.bat
So, every time machine start, the program runs displaying challenge to STOP the message or press F2 to escape. No one can stop that, any one teacher as they cannot see the batch file calling from. And in windows95 and before, if you give any Alt+255 Character, the folder will not been accessed, even in GUI also. LAST of all Instructor Formatted HDD. (as compaired with partition table match.

Good OLD Days, SWEET Memories and now I encourage students to do this for their benifit.

As, this trick is too old, just shared with our grate forum members.
Even I made RAVAN Raja Prompt with Alt+001 and 002 with Head, 219 = Body, Slash and back slash hand and leg and $_ to Line Btake, ^G to Beep etc. etc.

Of course only 23 sequence of ascii character file, typed with copy con, can vanish BIOS Password too.
Any Antivirus show that .COM file as virus, but our teacher just locked HDD, with BIOS Password and afterwards, he check that we opened HDD. interested person please check port 80 and 81. I can PM that but can not direct post it. Just search with "!bios".

SWEET Memories,

Thanks ujjwaana Sir for remembering me those days.

Kalyan -    

The picture of the Balsa Tree reminds me of some Indian Silk Cotton Trees @ Simul /Semul Trees I saw growing wild in the Manas Tiger Reserve at Baksa, Assam. They look EXACTLY the same.

@kalyan.....  ??


just heads up.... ordered  some balsa seeds... will soon be starting a farm.....


also found a Indian brother of BALSA.... if treated properly after cutting it is as good as balsa....( 100 times better than what is sold as Indian balsa....)

will have a thread  running soon if the experiments and procedure succeed.....

Aerovishwa, please share the identity of this "Indian brother of BALSA' what is he called?

Btw, all the best for your farm, 6 years from now we should all be looking at you for the affordable raw material.

its called  SAWAR in this place.... dont know its  real name....

heavy when wet but if u treat it...  like boiling and then drying in  a klin it get damn light.... also has that cross grain  strength.... still need to have a look at the honey comb structure  if present and the perfect cut  from  the log to  get the sheets  in proper grade..

VC sir  the simul  sample u sent me...... this wood of  the  same thickness weighs half the weight of  the simul after treatment....

Check this out:

Sawar wood is the same as Simul / Semul / Semal wood.

http://en.wikipedia.org/wiki/Flora_of_the_Indian_epic_period

Quote from: KALYANPRODHAN on April 11, 2012, 10:52:57 PM
There are some loop holes of the CopyScape program too.

At least I can display the same content though not same.

Just copy the entire materials im any word processor like openoffice or MS office.
Replace all SPACE with Alt+255 Character. (Looks like Space but not space, character of Extended ASCII Character.)

Thanks for reminding   my GWBASIC days as well (1993+) .. .But CopyScape is much more advanced than parlance of QBASIC, and is based on LISP/complex pattern matching algos. You have to really deliberate to avert them.

My whole point was that we should avoid careless copy-pasting (without due diligent steps to avoid detection) and simply put a mention so that the forum is protect and one's reputation too.

Quote from: VC on April 11, 2012, 11:14:19 PM
Kalyan -    

The picture of the Balsa Tree reminds me of some Indian Silk Cotton Trees @ Simul /Semul Trees I saw growing wild in the Manas Tiger Reserve at Baksa, Assam. They look EXACTLY the same.

If anything even close to Balsa were grown locally, the wood have fetched as much as Sisam/Mahogany as there are many serious uses of Balsa than mere modeling. Semul wood is 'Flaky' and ruboff quite easily. If you try to put monokote on Semul, the entire covering would peel off with thin layer of wood very soon.

I would really like to see someone commercially using even processed/treated Semul for the hobby

Quote from: VC on April 11, 2012, 11:39:41 PM
Sawar wood is the same as Simul / Semul / Semal wood.

may be..might be.... cant ignore....

but the description i got for  this ( that they called sawar) like long seeds and growing fast are  quite good  with balsa than with  semul which has wool like enclosed seed....

any ways will try and process some and then handout  some  samples to you and  other senior members and get some reviews...

"Semul wood is 'Flaky' and ruboff quite easily. If you try to put monokote on Semul, the entire covering would peel off with thin layer of wood very soon."

In that case, I probably have been very lucky to have acquired a very different genus of Semul. It is not flaky at all and sands rather well into a white finish. The feel is very similar to balsa but is about 2.5 times heavier.

I have used simul wood to make all parts including the bulk heads for boats and sheeted them with plastic sheets (for my Antares / Naughty Cal Cruiser build). Nothing has come off even after 2 years of storage and use.I have also had more bulkheads/ deck/ superstructure parts cut out recently for a new project that I plan to start soon. Quite happy with the results.

However, with its weight factor it may not be suitable for serious aeromodelling. I have crafted fuselages for small chuck / catapult gliders out of it and they flew satisfactorily.

sharing info helps us all, Balsa wood is an important part for us all, We must thank all those who highlighted this issue, I think many of us liked it, Question related to this hobby benefits us in many ways, for beginners most, Well I liked this   

Sawar probably is Khirish known in Bengali (খিরীষ) It's lighter but hard and become much lighter when dried. But i dint know how long fibre can be available. Karpus and shimnul both are lighter and of similar leave pattern. Look, the leave pattern similarity results in similar characteristics. 
Any photo of leave would be benificial to us.

one of the most useful wood for modelling came to me, is "UPPOOTHI" as we call it, is very lighter, but too strong when dried..i found it accidently, as was RCying boats at river side.. then my Students, took some efforts to collect big trunks from it, and dried it well.. after that we never looked back for.. still many balsa sheets are lying around me, but still using this simple wood.. do not know, excat species and genes of this wood, but will try to collect it's scientific name, and waiting for my Prof: Sir, Ibrahim Kutty, to examine the wood.. its too dense in our area, especially near to Calicut.. anyhow, its a nice alternate for me.. and also tried with tissue, and Monocote, for slowest and lightest flyers, worked fine.. i am also using this wood , by stripping with a circular saw, as strips, while making coroplat planes, as a reinforcement.. also, as a reinforcement in thermocol planes..

one of the greatest use to me with this wood is making hand carved propellers, for slowest fliers.. especially, with tiny motor gear set ups, like a tail rotor assy from a scraped helicopter.. too light, but too strong.. and easy to work and smooth..will share more details of this wood as i got some of my Modelling Students with me..its a very versatile wood..