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Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
It's actually possible to do the swashplate without a spherical bearing, I think. The spherical bearing just adds some rigidity. I think it's best to leave it in for now.
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
Ok, here's a very rough sketch of one of the four servo rams and a section of swashplate.
When all four servo's operate together, the spherical bearing (blue) slides up and down the propshaft (grey), giving your basic VPP.
When the servo's are not operated in unison, the swashplate (red) tilts, simple.
The servo rams (yellow) are connected to the ring (green), which is connected to the swashplate by two taper roller bearings, although it's possible to use a single bearing, two taper rollers are generally a better 'engineering' solution . The servo pivots are not shown here (yet). The connecting rods (also yellow) are connected to the swashplate and operate the VPP (I've not drawn the conrod pivots yet, either).
Any other questions?
(This is a first attempt, using standard sized bearings. I'm sure this basic design can be improved considerably)
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
That looks pretty much like what I posted. There may be some detail differences. If that suits your purpose, use it, if not, we'll design something that does.
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
Pretty good animation here:
I think I'd be tempted to stick with a tail rotor and one lift rotor for simplicity, but this isn't my project
EDIT: just found this: "Today, on most modern aircraft the swashplate is above the transmission and the pushrods are visible outside the fuselage, but a few early designs, notably light helicopters built by Enstrom Helicopter, placed it underneath the transmission and enclosed the rotating pushrods inside the mainshaft. This reduces rotor hub drag since there are no exposed linkages."
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