140 or 120 swash ?

[milly0812]

Just rebuilding my rave and the donor airframe has come with a 120 swashplate whereas originally I was flying with 140. Now I'm running a vbar which doesn't have a preset for 140 but flew great with some values I got from the freak.
My question is ' is there an advantage to a 140 or shall I use the 120 which will make vbar setup simples ?

[Rotorhead]

140 is the better option, if you look at the heli from the side and measure the distance between the mast and the pushrods, the distance will be the same front and back, this eliminates unintentional pitch/elevator cyclic mixing, whether that matters much with flybarless..... I doubt, but better is better.

[tonystevens]

My raves set to 140 don, might set it to 120 though as i don't fancy the swash plates chances in a crash with those mega long balls on! I believe there's not much to gain having it 140 when your fbl anyway.

[Andy from Sandy]

When servos were slower the 140 layout was the better design. With the speed of servos now the 120 seems to be just as effective. Which ever way round it is one of the servos elevator or ailerons only travel half the distance when making an elevator input hence the pitch interaction you get with slow servos.

[tourerjim]

Don't think 140 is good for fbl as it would give you greater swash travel than the 120`

[Andy from Sandy]

Don't think 140 is good for fbl as it would give you greater swash travel than the 120`

Whatever mixing is done in a transmitter for 140 degree swash the same mixing could be done in the FBL controller. It wouldn't make any difference.

[jwatts007]

The elevator servo works twice as hard on 140 than the 120 set up....

[milly0812]

I did have geometry problems with the vbar and had to move balls in on servo arms and only just got cyclic pitch acceptable but the linkages just look better with the 140 swash balls. As u say tony they are huuuuge lolImageUploadedByTapatalk1345063903.346637.jpg

[Andy from Sandy]

The elevator servo works twice as hard on 140 than the 120 set up....

That could only be true if your only inputs were elevator. For pitch they all work equally as hard and for aileron input it doesn't do any work at all.

[tourerjim]

Whatever mixing is done in a transan mitter for 140 degree swash the same mixing could be done in the FBL controller. It wouldn't make any difference.

I can only refer to 3gx if you set 140' then in 3gx dir mode you have to set 8 degree cyclic but would have to lower swash mix way low to get the 8 degree but its an interesting subject that temps me to give it a go.?

[steve_b]

I would go for 120, if vbar doesn't have settings for 140, as it will have been designed with the 120 swash in mind.

I also remember seeing something on AllMyRC from Curtis Youngblood saying that for FBL he felt that 120 was better, but on FB heli's then 140 was the better option.

[tourerjim]

All my fbl's are set up 120' & my 700 fb is 140' or should it be 120' .???

[Andy from Sandy]

I can only refer to 3gx if you set 140' then in 3gx dir mode you have to set 8 degree cyclic but would have to lower swash mix way low to get the 8 degree but its an interesting subject that temps me to give it a go.?

For the 3GX you set the swash type in your TX? That being the case the output to swash must be a function of your particular transmitter I would of thought.

[rachel]

Just rebuilding my rave and the donor airframe has come with a 120 swashplate whereas originally I was flying with 140. Now I'm running a vbar which doesn't have a preset for 140 but flew great with some values I got from the freak.
My question is ' is there an advantage to a 140 or shall I use the 120 which will make vbar setup simples ?

120 is used by Curtis on the Env , it's apparently slightly better on fbl than 140 and easier to set up on v baaaaaa :-)
x rach

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