My Align fbl experience

[Bruinbear]

It's still early days yet and will take a little time to get it working as you want Chris. I'll be down the field tomorrow (Sunday) and look forward to watching your progress. Thank you Clare for the video....'come on hurry up' !
Mike.

[GravityKills]

The bounce on the elevator as seen in the 600 Szabo video i think is not major but its there and IMHO is detracting from the enjoyment of flying it at present.

Use shorter swash servo arms.
On my 700 FBL (with a different head) it's barely 8 mm (16 mm ball-to-ball).
It sure looks funny, but it gives correct pitch range.

[Asid]

Hi Chris

The bounce could point to the gain being to high.

Or

The control loop could be affected because of the speed of your servos.

Just a couple of thoughts .

Keep up the good work.

See my post about the setup pdf. It may shed some light

[raptorheli2]

i also had elev bounce on mine and it's defo not servos on mine. 8915's with 7.2v into them.

it maybe gain related though and it maybe vibes related. my money is on it's a failing of the system. you can see bounce in szabos videos.

cheers

[Jamin_00]

If I is a prob with the unit can this be sorted in an update?

[Asid]

Chris are the ball links smooth and slop free?

Regards

[ChrisB]

i also had elev bounce on mine and it's defo not servos on mine. 8915's with 7.2v into them.

it maybe gain related though and it maybe vibes related. my money is on it's a failing of the system. you can see bounce in szabos videos.

cheers

Paul


Any more info? are you planning to start another thread or add to this or existing one.

Your input would be most helpful.

I am tending to agree with Paul,this bounce can be seen in other vids,you can mask it if you dont do sudden cyclic stops.

Will persevere though,as you dooooo

[Asid]

Chris you never told me about your balls

(see my previous post)

[raptorheli2]

chris, i bought the system knowing about this bounce. i seen it in the videos but i thought i'd have a dabble anyway.

if i was to bet can the user fix it i'd say no, if a firmware update could fix it, yes.

i do ofcourse hope i'm wrong there.

i never got flying again today (getting new heating fitted in house so building site) but i will 100% tomorrow.

cheers

[ChrisB]

Use shorter swash servo arms.
On my 700 FBL (with a different head) it's barely 8 mm (16 mm ball-to-ball).
It sure looks funny, but it gives correct pitch range.

I was wondering this also,will persevere with the Align supplied ones for now but i try futaba circular horns with holes further in if this persists.

So you are in effect saying excessive mechanical gain yes?

Asid

I have just read your link to then Q and A stuff,,cheers.

Everything is smooth,i can turn the gain down to a point where the model will not track true in forward flight so gain is then too low but the bounce persists.

Could be the servos,very possibly.

Gravitykills could be on the money with the supplied horns holes being too far out;.

[raptorheli2]

it is a really bad idea to use smaller arms to do this. your putting excessive load through the system........but it is the done thing but doesn't make it right.

cheers

[ChrisB]

Totally agree Paul it will increase the load on the servos,with the V B you can optimise this out but here it may be more tricky.

TBH i can live with it for now if i can sort my tail out which is a bigger PITA TBH.

I think i have the tail sorted though ready for tomorrow by classic gyro setup theory of moving the ball in on the servo arm and raising the electronic gain.Its behaviour today shouts excessive mech gain to me.

[Asid]

Chris what is the distance of the ball on your setup. ?

Mikado advises shortening the distance.

i agree with Raptorheli .That's why they recommend fast strong servos.

What about in the software. Maybe if you had an acceleration parameter like the spartan gyro. This would reduce bounce.

Just a thought

[GravityKills]

erm guys... not sure if I understood this right.
the shorter the servo arms, the less the load on the servo.

To create a given force in the pushrods, a shorter servo arm requires less torque on the servo (but more movement for the same travel).

The 700 isn't really designed for flybarless, that's the problem. The bellcranks are wrong, because they translate 1 mm of servo pushrod movement into 2 mm of swash movement.

[raptorheli2]

yup, spot on asid. what we need is a dampening effect which could be sought out in the software. but who knows what this software will offer.

cheers