RunRyder - F3C basic settings

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Aerobatic FAI F3C Contest > F3C basic settings

fergus
Veteran
Location: Ireland

Is there any available video clips of the full C schedule being performed ?

Regards

Fergus

11-09-2007 09:59 PM

GM1
Elite Veteran
Location: Tallahassee, Florida US

Video

I have not seen any video of "C." Usually Erich shoots some video at the Tampa contest so that may be the first chance to post any.
Hard dampers do not hover as well on my models BUT they last much longer and I don't have to rebuild the head nearly as often.
Gordie

On a dog sled team, if you're not the lead dog, the view never changes.

11-12-2007 05:42 PM

Spacey
Senior Heliman
Location: Pretoria, South Africa

Hehehe...That's a fact Gordie. We discovered that on the Sylphides also, the soft dampers are magical but they don't really last more than 20 flights before they start going sour and becoming a little unpredictable. I've had some better luck now that I tend to forget about it and just fly the helis but I know in the back of my mind the dampers on both my machines aren't all that pretty anymore when I remove the cover.

It's kinda like they deteriorate though to a point and then their ok for a long time? Hahaha

The harder white dampers seems to last forever though but like you said, I can't drop headspeed during hovering nearly as low as with the other dampers before the dreaded bobbing starts. And the heli is a little more prone to wobbling if you bump around on the stick while hovering, it does however give the machine a little more crisp feel upstairs which I guess is what we'll want for C.

11-13-2007 08:16 AM

Bond007
Senior Heliman
Location: Leicestershire UK

Hovering trim ?

Hi

On the initial flight of my Trex, had to use a lot of fwd cyclic trim to hover nicely. When I did a pirouette, with the tail into wind, the trim change was massive, as to be expected. Also when inverted the nose pitches up (a lot). I'd like to get it trimmed nicely, but know it's always a compromise.

Heli was setup with everything at 90 degrees, swashplate level at mid travel etc, so I know the mechanical setup is good, and I have checked for any interaction.

The CofG is skids level with an empty tank. My thinking is to add a bit of nose weight and try again.

Any thoughts?

Thanx,

Sean

12-23-2007 12:52 PM

RCHelicopterGuy
Veteran
Location: Michigan

From what I understand, static CG is of little to no value. As it has been explained to me (and what seems to work well), you need to:

* Remove all trim and subtrim in your radio
* Make sure that your swashplate is perfectly level throughout your whole collective range (super finicky physical setup stuff)
* Trim the machine for hovering in flight by adding or removing weight from the model
* DO NOT use trims to correct a model that doesn't hover well, or you'll have exactly the problem you're having.

My guess is, the reason your model acts tail heavy in the air (but balances statically), is because you're feeling the effect of the rotor downwash acting on the horizontal fin. The downwash pushes on the fin, and effectively makes your heli back up. Add nose weight to counteract.

12-23-2007 02:13 PM

steviewonder33
Senior Heliman
Location: London, England

Sean

Try playing with flybar length and paddle weight....

Steve

Team JR, Motors & Rotors, SAB, Bekra Fuel, ThunderPower Batteries

12-23-2007 04:52 PM

HOMEPAGE

Bond007
Senior Heliman
Location: Leicestershire UK

RCHelicopterGuy...

Thanks for the reply. I'm going to move the CofG forward and see what she's like.

Steviewonder33...Funny you should mention that, but I have put a longer flybar on. Gone from 400mm to 440mm. Haven't had enough stick time yet to evaluate the difference. Would a different length flybar make a difference to your hovering trim

I'm going to try a combo of heavier paddles and/or flybar weights over the next few weeks. I know this'll make it 'sit' better in the hover, but again would it make a difference to the hovering trim

Regards,

Sean

12-24-2007 10:23 AM

steviewonder33
Senior Heliman
Location: London, England

Sean

Yes it will! It will make a difference to the amount of flybar input to the blades and that is what will make the difference. Head speed will affect this aswell.

Have fun!

Steve

Team JR, Motors & Rotors, SAB, Bekra Fuel, ThunderPower Batteries

12-24-2007 10:40 AM

HOMEPAGE

Bond007
Senior Heliman
Location: Leicestershire UK

Thanx Steve

12-24-2007 12:36 PM

Bond007
Senior Heliman
Location: Leicestershire UK

Well gone back to a 400mm flybar and soft dampers