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10-15-2005 02:22 PM  13 years agoPost 1
fred gipp

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hello im a newbie,
bin flyin helis for several yrs and have a question concerning flybars. will a longer flybar or a shorter flybar increase responce speed with the same size paddles. i have been arguing with myself and cant decide.
thanks very much fred gipp.

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10-15-2005 02:24 PM  13 years agoPost 2
DS 8717

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Longer is faster,needs to be quite a bit to tell the difference - 40-50mm longer

YOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED

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10-15-2005 02:39 PM  13 years agoPost 3
fred gipp

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thanks very much Douglas its been doin my head in .going to modify my magic II to see what happens.

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10-15-2005 02:55 PM  13 years agoPost 4
airdodger

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Johnston USA

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10-15-2005 10:48 PM  13 years agoPost 5
Gearhead

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Vt

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aaaaa not this gain LOL

Fred, don't be deceived,,, many flyers have reported that their helis have became more stable with longer flybars,,,

in the link Collin Mill failed to mention 1 little point,,,

Collin writes,,,
Increasing the length of the flybar speeds it up.

This last point was something that Ken Rudd touched on in W3MH some time ago. However its not obvious why this should be the case so let me just give my reasoning for it. If we take one size and weight of paddles and fit them to a flybar that has been lengthened by say 10%. We :-

1) increase the moment of inertia (the flywheel effect) of the flybar. This means that the flybar will need a greater torque to impose a given rolling or pitching rate on it.

Now effect 1) acts to slow down the response of the flybar, and it involves a square law so a 10% increase in flybar length increases the torque needed for a given roll rate by about 20%.
-------------------------------------------------------------------------

2) However, in putting the paddles further out we have increased the leverage that they have so that, for a given aerodynamic force on the paddles, we have a bigger torque.
3) In addition, by putting the paddles further out we have, for a given head speed, increased the airspeed of the paddles and thus increase the aerodynamic forces they produce.
However, effect 3) also involves a square law so, with the paddles 10% further out they produce 20% more force for a given cyclic pitch. So effects 1) and 3) cancel one another out. This leaves effect 2) which is linear and so a 10% increase in flybar length speeds the flybar up by 10%.
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so what is the 1 little point Collin Mill failed to mention ??,,, it is the fact, that point 2 and point 3 ONLY come into effect when cyclic stick input is given,,, in a hover with a longer flybar if you give NO stick input your heli well remain more stable to the wind because of the "higher flywheel affect", this goes along with forward flight too, once in forward flight you hold your cyclic stick steady in one spot your heli well be less effected by wind,,, then once you move your cyclic stick your heli will respond quicker,,,


research the magazine Model Helicopter Technique # 28 volume 7, number 4, article "Up in The Air" written by Mike Goza, see page 5 upper right...

Jim

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10-16-2005 07:13 AM  13 years agoPost 6
TroyE

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Orlando, FL.

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would not a shorter flybar provide for a generaly faster heli responce?

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10-16-2005 11:09 AM  13 years agoPost 7
DS 8717

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I did back to back flight testing. When i installed a longer flybar the cyclic was faster when i input cyclic. Not a big difference but it was faster. I went from a 450mm flybar to a 475mm flybar on an XCELL. The ONLY thing i changed was the flybar.

YOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED

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