one Girl's Rave ENV Build or "pink my Rave"

[scallybert]

What I stated is correct. I think you are confusing the inherent stability of the flybar (which is a function of it's mass and speed) vs the mixing of control authority between the swash and the flybar.

Hmm... I'm fairly convinced I've got a reasonable idea what I'm talking about here...

There is a good article on this by Colin Mill which can be found here; Model Aircraft and Model Flying - W3MH - Home Page

Yes, it's very good & I read it ages ago.

[[[

The speed of response of the flybar to commands can be adjusted as follows:

• Increasing the weight of the paddles slows it down.
• Increasing the area of the paddles speeds it up
• Increasing the rotor RPM speeds it up
• Increasing the aspect ratio (span/chord) of the paddles speeds it up.
• Increasing the length of the flybar speeds it up.

]]]
Hence, as we'd expect, increasing the paddle weight slows the flybar response.

The aerodynamic efficiency of the paddles and the weight of the paddles effectively work against each other. But I accept that the paddles have to be heavy enough to 'work the controls'.

The flybar authority comes from the mixing ratios.

There are two important things to remember:

* The flybar should be lagging the roll/pitch of the main rotors - and hence applying a control input against the 'Bell' input;

* There's an implicit control input to the fly-bar due to the flybar disc's tilt with respect to the mainshaft. This tends to make the fly-bar follow the heli - which tends to work against its stabilising effect.

This latter point is (IMO) the problem with flybars. If you make them respond fast, they become less effective as stabilisers, as they respond faster to the disturbance. This can be programmed out of FBL systems (or just not programmed in).

[trillian]

Hmm... I'm fairly convinced I've got a reasonable idea what I'm talking about here...

...And know what I'm talking about as well.

My point was simply that if the change of paddles resulted in greater control response at the expense of stability, some of that stability might be able to be restored with the combination of weight / and paddle shape. This is because the 'stability' aspect of the flybar comes from it's rotating mass, the greater the mass (and to a degree the length but this is countered by greater paddle airspeed) the more energy the flybar has to resist movement. It's the paddle shape, size and mounting position that gives you control over the flybar and hence the cyclic pitch.

The flybar ratio on the mixer arms divides the control authority between the swash and the flybar but ultimately you have to get the flybar to move which is down to the paddles. I know I'm repeating stuff you and I both know, we are both right (or more precisely, I was not wrong )

[scallybert]

...And know what I'm talking about as well.
[...]

I've generally thought so...

Maybe your original statement didn't mean to me what you meant it to mean.

AIUI, increases to the mass of the paddles and the aerodynamic force (lift) they generate, effectively cancel. ie if you double both the mass, and force, the behaviour is unchanged. Except for the effect that control resistance, friction, etc has on the flybar.

I'd speculate that if you start with a heli that flies nicely; and change the paddles for ones that weigh the same, but generate more lift; any loss of stability/'locked on feel'/etc won't be down to control resistance (as above), but because the flybar precesses faster in response to paddle cyclic pitch - specifically that it 'follows the heli' faster.

[i]This is effectively a bad thing. If you have a (presumably common) situation where the flybar is in the correct attitude, but the heli is in the wrong attitude; you want the heli to move towards the flybar's attitude significantly faster than the flybar moves towards the heli's attitude.

I hope that's thought provoking, rather than just provocative...

[rachel]

Update time !!!!!!!

well it's been a while , over 10,000 views too wow maybe I should write a book lol
dave has changed a bit,...... he's gone back to his initial configeration, flybarless , whoot whoot.

refit Mark Christy's kindly donated head , strap on another Total g and ,.........
total satisfaction

I have been playing with paddels and flybar lengths with dave but , getting nowhere fast, I am well aware curtis is the master but I just couldn't get Dave to the sweet spot I like , so with Charmouth comming up I did the deed and gave up on the old flybar,

So a couple of flights on the Sunday at Charmouth ,maybe not the best place to testfly a heli, but wonderfull company , and wow heli heaven I am In love with a large pink heli called Dave.

I have found my flying improving quite nicely latley so here is a video update of dave and I from sunday, not the best bet a fair representation of my flying at the moment. Such a nice day too roll on the summer !!!!!

Have a good one everyone see you soon xxxx Rachel

oh the video ;-) enjoy.
CYE Rave 90 FBL Total-G on Vimeo

[mark Taylor]

Glad your liking your rave now Rachel

Maidened my rave e at the weekend, I'm running v-bar 5
It's totally mental in the power/ response department

Just need a few more flights to get it how I want it

Very impressed by this Heli

[Dudifiedad]

Nice flying Rachel at charmouth, unfortuantly my Rave boomstruck on first flight there

[rachel]

Nice flying Rachel at charmouth, unfortuantly my Rave boomstruck on first flight there

NNNNNNNNNooooooooooo why???????? what happened .
I am sorry I wasn't well (self inflicted I am sorry to say ) such a waste of a day but hey we live and learn, anyway sorry I missed it.
Lots of Raves at Charmouth at least 7 ,may be more

Next stop Park Hall are you going there ?
X Rachel