平衡桿

飛影

　　

lchgti

哈哈!總算董了.
我想沒平衡桿cyclic基本上根本無法控制.
原來用2個陀螺儀取代.
成為三軸的啦.
這要改還挺麻煩!
主軸外加兩個陀螺儀.
這台是你的ㄇ?
操控性如何?聽不聽話?
謝啦!

tudole

如果光是拿掉平衡桿 cyclic 就沒法控制了
基本上要是把旋翼頭改成貝爾式 那麼小的旋翼非常不穩定 所以加上兩個陀螺儀增加穩定性 在一般的直昇機上也有所謂的Stability Augmentation System(SAS)作用跟遙控直昇機的陀螺一樣

chinlin

QUOTE (tudole @ Jan 3 2006, 03:31 PM)

如果光是拿掉平衡桿 cyclic 就沒法控制了 基本上要是把旋翼頭改成貝爾式 那麼小的旋翼非常不穩定 所以加上兩個陀螺儀增加穩定性 在一般的直昇機上也有所謂的Stability Augmentation System(SAS)作用跟遙控直昇機的陀螺一樣

lchgti:
不是, not mine!! 都交給控制器, 剩下就是你的使喚了!!


tudole:

看了a chopper is born那一款沒flybar的直昇機.也沒裝什控制器
好像用腳它車線去控制十字盤... 飛的穩穩的
這個原理要怎樣解釋沒flybar不用飛控也能飛的好好的?
why?
飛航大師..又有機會問你了

tudole

QUOTE (chinlin @ Jan 5 2006, 02:03 AM)

tudole: 看了a chopper is born那一款沒flybar的直昇機.也沒裝什控制器 好像用腳它車線去控制十字盤... 飛的穩穩的 這個原理要怎樣解釋沒flybar不用飛控也能飛的好好的? why? 飛航大師..又有機會問你了

I never seen "a choppr is born" so I don't know which model it is. But for the most sucessful early age helicopter, they all use teetering rotor. You can find this rotor desin in Robbinson R22/44 and many Bell models. It is very stable (and very inert)without artificial stablization.

chinlin

it is the model type - "THE EXEC 162F"
this kind of helicopter seems a seesaw head(teerteering head,also) on it without flapping hinge,lead/leg hinge and flybar.
It doesn't have the auto control system, because I saw the process of installation of it.

refer to http://www.rotorway.com/intro.html

thank you

chinlin

BTW, one more question to ask.
How does "anti-rotation" device affect the gyroscopic procession after 90 degree? does the deivce will delay its precession effect or more earlier? if 2 anti-rotation devices are used on swashplate, will it be double effect on something? I can't find some relations about it　
could you explan for it?　

thank you

tudole

QUOTE (chinlin @ Jan 8 2006, 07:20 PM)

BTW, one more question to ask. How does "anti-rotation" device affect the gyroscopic procession after 90 degree? does the deivce will delay its precession effect or more earlier? if 2 anti-rotation devices are used on swashplate, will it be double effect on something? I can't find some relations about it　 could you explan for it?　 thank you

Don't quite understand your question... If you are talking about the gyroscopic effect from the aniti-rotation device with anchor the upper swatch plate to the rotor, the dynamic effect is very small compared to the whole rotor system. It is negligible.

lchgti

I think in the RC helicopter the fly bar very important for the controller smoothly of direction you want to go.
The fly bay is the main key controls the helicopter the way you want to go. It rights?
The main rotor just supply the power let stay in the sky.

chinlin

QUOTE (tudole @ Jan 10 2006, 12:54 AM)

QUOTE (chinlin @ Jan 8 2006, 07:20 PM) BTW, one more question to ask. How does "anti-rotation" device affect the gyroscopic procession after 90 degree? does the deivce will delay its precession effect or more earlier? if 2 anti-rotation devices are used on swashplate, will it be double effect on something? I can't find some relations about it　 could you explan for it?　 thank you Don't quite understand your question... If you are talking about the gyroscopic effect from the aniti-rotation device with anchor the upper swatch plate to the rotor, the dynamic effect is very small compared to the whole rotor system. It is negligible.

在anti-rotation的影響之下, gryoscopic precession效應會有一定的影響吧
一般都只會有一個anti-rotation device,如果除了swashplate後面裝了anti-rotation device,前面或其它也裝anti-rotation device,是否對gyroscopic的90度反應後有不同的結果(ex:會延後更多, 還是提前等現像)?

thank you

tudole

In short, anti-rotation bracket does nothing to helicopter dynamics. It is a mechanism to hold the upper swatch plate, so the upper swatch plate will rotate with the shaft (that's why it's called anti-rotation device or bracket). To save weight and cost, one is enough for a helicopter. The mass is small, and it is very close to the rotation center. So, the gyroscopic dynamic is nearly nothing comparing to the rotor aerodynamic.

tudole

QUOTE (lchgti @ Jan 11 2006, 06:23 AM)

I think in the RC helicopter the fly bar very important for the controller smoothly of direction you want to go. The fly bay is the main key controls the helicopter the way you want to go. It rights? The main rotor just supply the power let stay in the sky.

Yes, you're right about the imortance of a fly bar to a R/C helicopter. Because most R/C helicopter has a Hiller/Bell rotor design. Fly bar flapping is mixed into the cyclic command.

However, main rotor DOES NOT only provide the lift; it also provide the moments and forces for control and manueuver.

chinlin

QUOTE (tudole @ Jan 13 2006, 12:16 AM)

In short, anti-rotation bracket does nothing to helicopter dynamics. It is a mechanism to hold the upper swatch plate, so the upper swatch plate will rotate with the shaft (that's why it's called anti-rotation device or bracket). To save weight and cost, one is enough for a helicopter. The mass is small, and it is very close to the rotation center. So, the gyroscopic dynamic is nearly nothing comparing to the rotor aerodynamic.

can the servo linkage be as an anti-roation device?　I think the eCCPM 's servo linkage is strong enough to hold it. why still need anti-rotation device?
I do belive there is some effect on the angular momentum with the anti-rotation device. ex: precession effect , early or late response. but I am not sure. can u check for it with ur friends?

chinlin

QUOTE (tudole @ Jan 13 2006, 12:21 AM)

QUOTE (lchgti @ Jan 11 2006, 06:23 AM) I think in the RC helicopter the fly bar very important for the controller smoothly of direction you want to go. The fly bay is the main key controls the helicopter the way you want to go. It rights? The main rotor just supply the power let stay in the sky. Yes, you're right about the imortance of a fly bar to a R/C helicopter. Because most R/C helicopter has a Hiller/Bell rotor design. Fly bar flapping is mixed into the cyclic command. However, main rotor DOES NOT provide the lift. It also provide the moments and forces for control and manueuver.

flybar flapping??
but it doesn't have flapping hinge.
how could it be flapping? there is no corning angle exist in the fly bar.
I think it is the pitch changing and with the see-saw hinge to easily change the main blade's pitch.
about ur last discussion, I think it might be error-typing:
main blades DO provide the lift, and provide the moments,forces for control and manueuver.

tudole

QUOTE (chinlin @ Jan 12 2006, 10:25 PM)

However, main rotor DOES NOT provide the lift. It also provide the moments and forces for control and manueuver. [/QUOTE] flybar flapping?? but it doesn't have flapping hinge. how could it be flapping? there is no corning angle exist in the fly bar. I think it is the pitch changing and with the see-saw hinge to easily change the main blade's pitch. about ur last discussion, I think it might be error-typing: main blades DO provide the lift, and provide the moments,forces for control and manueuver.

It was a typo, thanks! I have corrected my orgin text.

Fly bar does flap... it's a teetering rotor. The hinge is in the center of the hub.