Do You Use Trim?

[CloseYetFar]

I came from the flybarless world with a 450X and 300X that do not use TX trim. I got a 450 3D so I could experience a flybar heli. Is it normal to have to apply cyclic trim each time you fly? It's not to much about 5-7 clicks, it usually wants to roll forward slowly. Maybe its just getting blown around by the wind.

I did level my swash-plate and even used a digital pitch gauge. It only varies about 1 degree of pitch at all four 90 degree placements. Center of Gravity seems good too.

I think I may have been spoiled with flybarless stabilization.

Any thoughts? Thanks

[kuskye25]

Originally Posted by CloseYetFar

I came from the flybarless world with a 450X and 300X that do not use TX trim. I got a 450 3D so I could experience a flybar heli. Is it normal to have to apply cyclic trim each time you fly? It's not to much about 5-7 clicks, it usually wants to roll forward slowly. Maybe its just getting blown around by the wind.

I did level my swash-plate and even used a digital pitch gauge. It only varies about 1 degree of pitch at all four 90 degree placements. Center of Gravity seems good too.

I think I may have been spoiled with flybarless stabilization.

Any thoughts? Thanks

no you shouldnt have to use any trim, and you really dont want to trim for wind anyway cause once you turn and the wind is on the otherside of your chopper itll be way off...

as long as your swash is level and you got all your pitch's set at mid,top,and bottom stick it shouldnt need any trim... maybe a blade balance issue or tracking issue your having...

i have a 4503d and have flown a 450x, for hovering and basic moving around i noticed absolutely no difference until i actually flew it around some, then i could notice it was a bit more stable but not a ton.....

[907Heli]

Should not have to use trim. Your 450 3D isn't going to be as stable, we usually get the swash as level as possible, try to adjust the battery for optimum cg, then on a calm day adjust it mechanically to get the drift out. Seems to work pretty well. Perfectly level would be better I suppose when you start going inverted, but mine goes inverted quite well. Stay away from sub trims too.

[Gladius]

You absolutely should not use trim to correct drift. You're only fixing the symptoms without fixing the root cause. You need to adjust your swash until it stops drifting, but you need to first need to have your CoG set right.

[Offset]

I wouldn't say stay away from sub trim. Just use it only as a last resort to get your servo horns to perfect 90 degrees. Avoid using it to level your swash, do as much adjusting mechanically as possible, it should all line up within an acceptable level of tolerance if you got your horns to 90 at 0 pitch.

Each full 360 turn on a control rod link is 1 degree of pitch. I'm not sure exactly how many millimeters in height it gives though, but the proper height of the swashplate will be determined when your bell cranks are perpendicular to the main shaft.

Also if you going to level your swash in a circular fashion, it's better to set the pitch control rod/link of the blade you're using to each servo control rod. 3 points instead of 4.

[dannylightning]

Use subtrim to 90 servo horns and level swash on a fly bar helicopter. No other trim should need to be used after u do that.

On fbl it depends on the unit. Once initial setup is done u never use trim. For instance on the v bar u use sub trim and travel adjust i think it is to get all your sticks to read 0 at center and 100% at full movement. Once they read 0 u never touch that stuff again. On beast x u never use trim for anything.

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