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Nice to have a few people show an interest in this very interesting phenomena of rotor flight. Karl, your explanation was very good although you did not mention that the same condition would hold true with the helicopter sitting still and perhaps a ten mph wind blowing. The only problem for me...

I got my book and it is what I had hoped for. Four hundred and some pages of nothing but helicopter. It is the best book on helicopters that I have ever come across and I am delighted to have it on my shelf. A lot of math that I can not cope with but also a lot of diagrams of parts and they are...

Interesting question. I recently went to the library but could not find a book I took out many years ago and I think the title was "The Principles Of Helicopter Engineering" by Jacob Shapiro, circa the 1950s. I have now ordered this book from a used book place on the internet and should have it...

Mike, Thanks for the note about my Flapping question, it was nice to see someone is out there even if I do not fully agree with your assesment. Apparently the real Rotorcraft engineers are not out there as I thought they would be on this question of mine. I am familiar with Coning of a...

I have had a troubling question ever since I became interested in rotary flight and I know I must be careful with words so as not to be miss interpreted here. My understanding is that the major secret that Cierva uncovered was that the movement of the rotor blade in an up and down motion as it...

Thank you both for taking the time to add your notes here. I have been to the Carter site before but your note was a reminder. The Unicopter site was also very interesting and looks like there is a lot of information there if one is willing to do the clicking. Apparently my fascination with...

I am wondering if anyone out there has any ifnormation about the building of a rotorblade of perhpas 20 feet in overall length of mainly carbon fiber and fiberglass and some small amounts of aluminum. I would be interested in hearing comments about the idea. This would not be a rotorblade that...

The info given in your last note is of great interest and I will be using it in my future information searches. I long ago started the patent process with a provisional patent and am confident I will end up eventually with a patent that I have filed for but that process takes a good while and...

Dwightdixon, Your note is much appreciated and I assure you no bad mouthing was intended. Over the many years I have been around I have simply developed my own way of doing things and have had enough success to not particularly want to change. I have been to many web sites where model rotor...

My research on plastic, which has been mostly done on the internet, makes me realize that there are many different types and many different processes and for me to even try to learn enough to become an expert would be folly. I would have to leave my project of rotor pursuit which has brought me...

I am searching for any plastic extruder that might be producing an airfoil shape (as in autogiro rotors---flat on bottom). My concerns are for model type autogiros and would have a width of 1 inch to 4 inches.

Many thanks to all who took the time to reply to my problem of tube bending. The radius of my bends are in the neighborhood of 2 inches and I have no idea what the temper is of my 6061 aluminum tube. I alwasy thought that the tempered stuff was the 2024? I have tried the "filling with sand"...

I am renewing my search on how to go about finding a plastics firm that could provide me with some test units of a model rotor blade that I need for a new type of flying Autogiro Rotorkite that I am patenting. The blades on the rotor would be 24 inches long x 1/4 thick and 1.5 inches in width...

I have not met with any success in trying to bend 5/8 (.625) OD, 6061 aluminum tube with a wall thickness .035. I have tried both hot and cold bends and the inside of the 70 degree and 20 degree bends always kinks badly which weakens the overall strength of what I am making. I am wondering if...

I have designed a successful model autorotation flying machine that I call a Rotorkite. Two of my smaller models have rotor spans of 29 and 50 inches respectively which means the rotor blades are 14.5 and 25 inches in length. I intend on making an effort to market my efforts and of course the...

A splendid idea. I will give it a try. Thanks

Thanks for your note; I will certainly look into americanmatrixcorp.com. The thing I find most amazing about finding manufacturers of .250 graphite tubes is the fact that I am well aware of at least two retail firms that sell this very size on the Internet. What I want to do is contact those...

Thanks Compositepro for the info. That size is a little larger then I want but I'll take a look.

I have been searching all over the internet for some time now for manufacturers of pultruded graphite tubing in the size of around .250 outside diameter X 32 inches in length and cannot for the life of me find anything. I have been to dozens of sites that google or yahoo comes up with but cannot...

Your question has always interested me also and there seems to be some good answers here. I am unsure about helicopters and gyrocopters but I have been working on a project for years of developing a Rotorkite and the rotors that I make from wood are from 12 inches to 110 inches in length and I...