Raygun
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Post by Raygun on Apr 30, 2009 8:52:20 GMT -6
Hi I am just going to throw this out there I know it has been tried but I have never seen it done like I was thinking about. What IF you took a coaxial heli removed the flybar and upper blade holder and installed a second swash plate just like the one below tie into the same servo links so both swash plates moved exactly at the same time and the same direction?? You would dramatically increase the maneuverability of the aircraft and you would eliminate the flybar. I think you could fly this in a mild breeze you would need a ball link that would support a link top and bottom not impossible to do you would need to build the links in a way that they wont interfere with the blades or tie the top swash plate into the lower blade holder. What do you think?? I have enough spare parts to build one.. Ray
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rtfheli
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Post by rtfheli on Apr 30, 2009 8:58:54 GMT -6
Sounds interesting. If you have the parts, why not give it a whirl. Would love to see it in action.
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19000rpm
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Post by 19000rpm on Apr 30, 2009 12:08:35 GMT -6
That's an interesting concept Ray. I think it might work to have a second swash plate. Not so sure you could eliminate the flybar since it plays an important role in gyroscopic stability. It's certainly worth a try though.
Happy landings
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Raygun
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Post by Raygun on Apr 30, 2009 12:31:23 GMT -6
I am thinking the only reason you need that flybar is to keep the upper set of blades on an even plane during maneuvers if you had control of it like the bottom I think you could eliminate it  Ray |
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Dlan
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Post by Dlan on Apr 30, 2009 13:40:43 GMT -6
What about upper blades with weighted tips? Dlan.  |
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Raygun
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Post by Raygun on Apr 30, 2009 14:20:36 GMT -6
I have seen that a long time ago I dont know why it would not work might be hard on the blades. Ray
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Post by Solitaire on Apr 30, 2009 19:25:14 GMT -6
Hmmm, not sure I'm following your thinking here, Ray.
The benefit of the separate rotors spinning in opposite directions is rudder control. If you tie both rotors to shared servos, wouldn't you lose the individual rotation and thus no rudder control?
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Raygun
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Post by Raygun on Apr 30, 2009 21:10:06 GMT -6
No you would still have counter rotation both blades instead of just the lower one would tip in the same direction that is why you need the swash plate above. The top rotor would still rotate in the opposite direction it would just move in sink with the other. I just about have it all figured out.. Ray
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Post by lowbudget on Apr 30, 2009 21:27:41 GMT -6
the hard part is making the swashplate with 4 hookups that are the same distance as the lower 2 are to the main shaft that hookup to the blade grips - also they must pass each other on the same plane going in aposing directions ;D = VIC
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Post by Solitaire on Apr 30, 2009 22:04:50 GMT -6
No you would still have counter rotation both blades instead of just the lower one would tip in the same direction that is why you need the swash plate above. The top rotor would still rotate in the opposite direction it would just move in sink with the other. I just about have it all figured out.. Ray I guess I'm in one of my stupid modes. If the servo linkage is somehow connected to get both blade sets to tilt the same direction, how can the blade sets be separated to spin counter rotational? The higher linkages will get in the way of the lower blades. I'm really interested in how you are going to solve this, Ray. It seems impossible to my somewhat limited mind.  |
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Post by lowbudget on Apr 30, 2009 22:16:12 GMT -6
IT can be done - it just takes a little time - to do something like this it takes a frabricators mind to see a solutition to a problem such as this one ;D = VIC
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Post by coffinsnail on Apr 30, 2009 23:40:03 GMT -6
Your going to make two swash plates fight? wow..... (joking about Duel vs Dual lol) i suck at spelling unless they are short words lol
but the idea sounds cool.
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Raygun
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Post by Raygun on May 1, 2009 7:15:09 GMT -6
You cannot pass the linkage through rather you would have to have a swash plate on top of the lower blade grip and one above that as soon as the lower blade grip tips it will tip the swash plate connected to it since it is on a bearing the linkage will not spin and the blades will not be fighting one another. Now when the lower blade grip tips it is connected to another swash plate that tips as well tipping the top blade with both blades tipping in unison you will double the power in every direction since the flybar is just there to keeps things straight you wont need it. It could be a true outdoor coaxial I can make this work but will it fly?? Ray
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19000rpm
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Post by 19000rpm on May 1, 2009 9:46:27 GMT -6
da Vinci asked the same question. ;D
Happy landings
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Post by mightyxxwhitey on May 1, 2009 10:10:24 GMT -6
I took the flybar off my MCx and tried to fly... it keeps the upper blades stable, like a gyro. As long as the heli didnt move the blades stayed somewhat straight, but as soon as heli moved or faster head speed the upper blade went out of control and unbalanced the whole rotation causing the heli to fall over.
Hope this helped.
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