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Please take a look atwww.pattakon.com/fly/index.htmlIt seems it can fly, is stable and easy to control.ThanksManolis Pattakos
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A plastic box with two biros sticking out the top , aluminium cans cut into a shape something like blades - let me guess.....a kids school project ? I have to agree , though , a box sitting on a desk would be stable & easy to control........
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You are right echo,I wonder if it would stabilise my wobbly table?
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Manolis, welcome to the Forum.Thats an interesting little gadjet, mate.Cheers.Robert DunnMackay. Qld.Growing old is good while it lasts.
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In the video it looked pretty stable. It didnt move a millimeter in any direction.
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G'day Mark, where ya bin ? Tangled up in the council brawl over Heritage buildings ......? Is your table CLT ? What is causing the wobble.....hey , what you do on ya table is your business. Counter rotating blades have been around for 100 years .
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I heard much worse when I asked, two years ago, for comments about the VVA idea (for instance at TOV, old threads). Today you can see at www.pattakon.com/vvar/OnBoard/index.html the second prototype running at 9000 rpm on the road.Everything starts from an idea on paper or a drawing or a cheap prototype. Echo: please let me know where you meet non coaxial twin rotors with parallel axes, having wings much longer than their axes distance. This would help me.In any case, thank you for your time.Manolis Pattakos
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Sorry Manolis, I didnt think you were serious.Intermeshing contra-rotating rotors have been about for quite a while. I think you would have great difficulty scaling your model up to a usable size. That 'bend' you need to have in your rotors in order to maintain parallel drive shaft axis would really generate some serious centrifugal force when you spin them up. Whats the big deal in having non-parallel axis shafts and straighter rotors anyway?PS: when did we change subjects to VVA engineering? I thought your initial thread was about rotors?
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Magnerl: Why parallel rotors with intermeshing long blades? Simplicity and lightweight and reliability (just two rotors directly secured at the ends of the two crankshafts), stability, efficiency etc. Even because it seems a different way to approach a long existing problem.But don't see just the rotors, see them on the specific Junkers (opposed piston) engine that has only the advantages the opposed piston engines have and additionally provides some 40% more time for combustion ( a look at www.pattakon.com/pre/index.html will help ). Even as a Diesel (in order to carry much less fuel) it can provide very high power concentration.The centrifigal force tends to bend the blade downwards. The other force applied to the blade, i.e. the aerodynamic force, tends to bend the blade at the opposite direction. The total force has to be carried by the blade, not the centrifigal alone.The refference to the VVA engineering was a straight answer (to the comments sent) simply saying: I do can make a prototype of Libellula flying machine, but I need first to know, in order reject the project (saving money and time), if something like Libellula have been already made or described. And I think it is resonable to ask about this people enthusiasts in this field.The question to Echo, and anybody else, remains: Where on the web can I see a single picture or drawing with parallel intermeshing rotors having very long blades. This would be very helpful for me.Thank youManolis Pattakos
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Mannolis,From memory 'Focke-Wolfe' made a prototype machine with intermeshing rotors, try googling on Focke Wolfe, you may have some joy with it.Nicholas TomlinAlarmist - www.alarmist.com.au - we scare for you
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1940's Charles Kaman experimented with twin intermeshing rotors ( he also built the first turbine powered helo ) . The K-225 & the H-43 Huskie are good examples. The info is easy to find if you bother to look.
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As I know, there are four arrangements in helicopters. The tail rotor, the tadem rotors, the coaxial rotors and the inclined axes twin rotors.Focke-Wolfe and Kaman (which is actually a copy of Flettner-Colibri design) have the 4th arrangement.The new arrangement - if it is new - has parallel rotos with long intermeshing wings.So the question is still unanswered : Did you ever meet such an arrangement?In any case thank you for your effort to help.Manolis Pattakos
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I remember seeing some boneyard shots of a bloody big Russian Helicopter with twin pods on booms with rotors that may have intermeshed, but its far too foggy to remember exactly - too long ago. Each rotor had two tubines driving it and it may be the versions that Echo refers to.. have a look and you might be enlightened, sorry I can't help more.Nicholas TomlinAlarmist - www.alarmist.com.au - we scare for you
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NiqueNaque: May be the Soviet Kamov Ka-25 is what you mean, having arrangement with two coaxial rotors and no tail rotor.In any case, thank you all for your time.Manolis Pattakos
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