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HelicopterMain Discussion › What helis have 140 swash?
12-18-2013 07:55 AM  3 years agoPost 1
Sam2b

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Seattle, WA

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Looking around, I haven't come across a heli with a 140 swash except for the Raptor and Rave. What other helis have 140 swash?
(I'll accept 135 too )

This frustrates me: I'm perplexed why designers choose 120 vs 140. With 140 we can get more cyclic travel with large collective inputs. But with 120 the elevator servo's travel is maxed out, and then blows out. So, is the reason 120 is popular is because it is easier to manufacture? Or looks more clean?

In my eyes, only a 140 (or 135) degree swash makes sense given the 1:1 ratio between elevator and aileron. I've read several past threads on this subject, but I've not see why so many manufacturers today opt for 120 over the seemingly perfect 140 swash.

That all said, my next heli will likely have a 140 swash, thus limiting my choices unless an optional 140 swash is made available. (as if the manufactures are just WAITING to see what heli I'm going to buy next.)


Image from the Raptor E700 manual.

_Sam B_
Team MSH USA * Protos Max * Xpert servos * Cyclone Blades * ProgressiveRC * VoltMagic * Ecalc

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12-18-2013 08:06 AM  3 years agoPost 2
Taipan

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Sydney, Australia

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135 deg gives 1:1 aileron/elevator. I had a custom frameset for a Trex 700E that had 140 deg & felt like it flew more precisely than 120 deg. Also flew a G4 with 135 deg & felt precise.

However I reckon 120 deg has stronger collective as all 3 servos are doing equal work. Following this logic the centre servo on 135/140 would have to work harder than the other 2 for collective.

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12-18-2013 08:17 AM  3 years agoPost 3
dj80550

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Texas

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JR E6 offers a 140 deg.
From JR comparing 120 and 140:

"140 degree CCPM offers smoother operation of the combined servos and an equal cyclic rate all around. On a 120 degree setup, the left/right cyclic is slightly faster than the fore/aft cyclic."

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12-18-2013 11:35 AM  3 years agoPost 4
Craigdieslemac

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Valdosta, Ga USA

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The 120 is preferred because it is the best setup for equal swash travel on all the axis. As was stated, all servos will work equally with collective and fore and aft movements. With a 140, you will get better roll left and right, but it will slow down your for and aft as your servos will have to travel a greater distance for the same amount of swash input as a 120.

Aut viam inveniam aut faciam

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12-18-2013 12:16 PM  3 years agoPost 5
Richardmid1

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Leeds, England

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Heres where I see the benefit of 140, if you do big fast elevator inputs with 120 and slowish servos (0.13 or more maybe) the swash will move up and down on the main shaft due to the aileron servos getting there quicker than the elevator servo which has to travel further. This problem is reduced and barely noticable with todays ultra fast servos.

60% of the time, it works every time!

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12-18-2013 12:38 PM  3 years agoPost 6
Craigdieslemac

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Valdosta, Ga USA

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It would be a flying style preference for sure.

Aut viam inveniam aut faciam

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12-18-2013 01:14 PM  3 years agoPost 7
Bouchah

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Willow Spring, N.​Carolina USA

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Hirobo SDX has the choice of 120 and 135 degree swash, same swash, different holes are used to achieve desired degree.

Blade 130x (5)
Trex 550 V2 (18)
Shuttle ZXX
Freya Xspec (20)

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12-18-2013 07:13 PM  3 years agoPost 8
billrad

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Rineyville, KY

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JS-TZ 50 will do a 140 degree swash.

billrad

I may not be able to turn a kit into a plane, but I can turn a plane into a kit...

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12-18-2013 10:30 PM  3 years agoPost 9
don s

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Chesapeake, VA

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TT G4.x series, TT X50 series, TT e620/e550

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12-19-2013 05:16 PM  3 years agoPost 10
f14tomcatfreak

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rochester,ny us

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Vibe 50nex is capable of both 120 and 140 degree setups

shut up and fly

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