AR7200BX Rearward drift

[Delarado]

Guys,

On my 450L Dominator I have an AR7200BX mounted upside down in the bottom tray, but the heli seems to randomly drift backwards. Sometimes its bad, other times not so bad.

Whats the deal with weight distribution on these FBL units? I had this on my old 450 pro as well but only seemed to happen when inverted on that. does the weight distribution need to be spot on for it to work properly, coz mine isnt exactly... or does it tend to be vibes on these units?

[r4nd0m]

what you should do is check your CofG if your 450L is badly off this may cause the fbl to over compensate - any particular manoeuvre when it drifts or is it more generic that it tends to lean backwards?

[Made2Fade]

You have answered your own question buddy... id suspect both of what you have already said. CofG is definately important on fbl models. Try different padding on the unit. What pad are you currently using? Id use a thin one on a 450 and put an align velcro strap over it relatively tight.

[Planehazza]

You have answered your own question buddy... id suspect both of what you have already said. CofG is definately important on fbl models. Try different padding on the unit. What pad are you currently using? Id use a thin one on a 450 and put an align velcro strap over it relatively tight.

+1. CG is essential and every beastX powered model I flew preferred a hard mount with a velco strap.

[Delarado]

yeah, just asking how critical it is, ive never noticed any drift at all on any of my Vbar or Vortex models, and the CofG is badly out on some of them - this one however will constantly drift backwards, the tail drops maybe 5 degrees a second... but it does seem to change its behaviour too so maybe its a vibe issue.

Its mounted with the standard Vbar pad you get and no velcro strap at the moment.

[Made2Fade]

both are quite crucial tbh... especially with a Beastx/ar7200 imo
Seeing the same issue on a friends trex 600 atm and his CofG is out because we mounted his tail servo on the boom. I know it'll be cured when i fit his 5000mah 2s rx pack. If it isnt ill be adding another pad. Ive seen it so many times its second nature now.

[Made2Fade]

So to answer your question directly then id say yes it is critical to have the CofG right Regardless of talking about fbl systems its critical anyways imo. If your doing 3d anyways?

[jwatts007]

The Vbar or Vortex both have a auto trim option...the BX will need trimming manually...the trim option is in the menu with the flashing light I think....

[Dan22]

The Vbar or Vortex both have a auto trim option...the BX will need trimming manually...the trim option is in the menu with the flashing light I think....

Yes, parameter menu (A), but if its a C of G issue and you trim it, the problem will be worse when inverted. (i think?)
Please correct me if i'm wrong

Dan.

[jwatts007]

Yes, parameter menu (A), but if its a C of G issue and you trim it, the problem will be worse when inverted. (i think?)
Please correct me if i'm wrong

Dan.

I have never trimmed a heli for inverted flight...just tail in then nose in a click here and there and off I go...I am sure I used menu A when I had a BX too sort out drift....

[Dan22]

I didn't mean I trim a Heli for inverted flight.......
What I meant was that trimming is fine but only if C of G is ok.....
Dan.

[George J]

Bottom line is c of g is very important to get right, if it isn't you'll always be fighting it with whichever FBL controller you use. Knowing it is wrong and leaving it but then trying to set up a FBL unit and trimming the heli to counter the bad c of g is a losing battle IMO.

[Peper]

I had the same issue on my 550dfc,
it had the thin 3M already so all I did was to use a tight velcro strap, drift gone