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I'm no gyro guru, but ... why can't you use a single control rod on a gyro for both aileron and elevator control? This would enable you to keep the control rod out of the airflow behind the mast and would, I think, aid in streamlining and keep it out of harm's way. It might conceivably be threaded up the centre of the mast, too, although that would certainly complicate inspection. What I envisaged would be a control tube that would rotate around its long axis for aileron control and move up and down its long axis for elevator. This would only require a single rod-end connection at the rotor-head and a fairly simple 'control mixer' at the foot of the mast activated by a tube (connected to the stick)that rotates around its centreline for aileron control that also has an elevator control rod (also connected to the stick) sliding backwards and forwards inside it. This assembly might also be shrouded inside the gyro 'backbone' member. Inspection would again be a problem in that case, but the whole thing could equally well be constructed out in plain view, if necessary.Any ideas about this, anyone? Or is there something obvious and basic that I'm not seeing?RonAvoid strong drink! It makes you shoot at tax collectors ....and miss!(Robert Heinlein)R.J.W.S.
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Good Idea Ron,However, there is a thing in the design of most machines that pertains to redundancy.This helps avoid the nessesity of wearing a parachute.and dont take this the wrong way, but to reduce the drag of a control rod might only decrease enough drag to allow the pilot to be able to smile a little harder!Mark.
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Good Idea Ron,However, there is a thing in the design of most machines that pertains to redundancy.This helps avoid the nessesity of wearing a parachute.and dont take this the wrong way, but to reduce the drag of a control rod might only decrease enough drag to allow the pilot to be able to smile a little harder!Mark.
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I'm sorry, but its not even a case of redundency, but the only way to control the head in both pitch and roll is to have min 2 push / pull rods.If Ron is talking about Cieva's C4 then elevator and aileron would apply.Sam.Melbourne Vic.
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I'm sorry, but its not even a case of redundency, but the only way to control the head in both pitch and roll is to have min 2 push / pull rods.If Ron is talking about Cieva's C4 then elevator and aileron would apply.Sam.Melbourne Vic.
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Can be done Sam, with push pull of the rod giving pitch control and rotation of the rod giving roll control. I would expect that the diameter of the rod to accurately handle torsional rotation would have to be fairly large and the complete system would be heavier than a conventional control system.Beginner's quotation - "I hit a bad gust of wind just as I took off"Tim McClureBroken Hill
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Can be done Sam, with push pull of the rod giving pitch control and rotation of the rod giving roll control. I would expect that the diameter of the rod to accurately handle torsional rotation would have to be fairly large and the complete system would be heavier than a conventional control system.Beginner's quotation - "I hit a bad gust of wind just as I took off"Tim McClureBroken Hill
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What I had in mind for the torsion rod was a 38mm dural tube with a Paulownia-wood insert. (Paulownia wood has 80% the strength of Karri and weighs 12% heavier than balsa wood). My calcs indicate this would give about a 60% margin over my expected peak forces. I used 3.0G and a weight of 300Kg as my starting point. I assumed a rod length of 2.0m.RonAvoid strong drink! It makes you shoot at tax collectors ....and miss!(Robert Heinlein)R.J.W.S.
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What I had in mind for the torsion rod was a 38mm dural tube with a Paulownia-wood insert. (Paulownia wood has 80% the strength of Karri and weighs 12% heavier than balsa wood). My calcs indicate this would give about a 60% margin over my expected peak forces. I used 3.0G and a weight of 300Kg as my starting point. I assumed a rod length of 2.0m.RonAvoid strong drink! It makes you shoot at tax collectors ....and miss!(Robert Heinlein)R.J.W.S.
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Ron,Take the worst senario, an open Gyroplane, two rods of each six foot in length, then take the amount of rod actually in the air flow, approx five and a half foot, work out the drag co-efficient of five and a half foot of three quarter rod in an airflow of 50kts, it will be seen that changing the present proven simple safe system is not worth all the trouble, other than an academic exercise and joy of building something thats different, all the best Pete Barsden.Pete Barsden
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Ron,Take the worst senario, an open Gyroplane, two rods of each six foot in length, then take the amount of rod actually in the air flow, approx five and a half foot, work out the drag co-efficient of five and a half foot of three quarter rod in an airflow of 50kts, it will be seen that changing the present proven simple safe system is not worth all the trouble, other than an academic exercise and joy of building something thats different, all the best Pete Barsden.Pete Barsden
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Carn fellas, reed tha qestian.Last time I loocked at pusher giro's, I coodn't see aylerons or elavators.ByeCrachetester
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Carn fellas, reed tha qestian.Last time I loocked at pusher giro's, I coodn't see aylerons or elavators.ByeCrachetester
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If your that worried about form drag use a couple of push pull cables and route them in behind the mast. Hell, one of them is already there anyway!
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If your that worried about form drag use a couple of push pull cables and route them in behind the mast. Hell, one of them is already there anyway!
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