Raptor30_V1
03-11-2011, 04:27 AM
Hello,
Did you ever trust any MFGs linkage lengths indications stated in the manual ? For a 3D-bird the big deal setting up the main-rotor linkages is mostly to find the right height (picture – height *L*).
The right height is the one, if setting all levers, flybar-cage, flybar etc. lateral or parallel to the main-shaft (throttle-stick on Tx in the mid - pitch curve default setting), as well as having the main-blade grip at Zero-degree collective the way, the swash-plate will deliver some symmetrical max./ min. collective pitch angle for the main-blades. This means e.g. to have +/- 12 degrees of collective when swash-plate is moved to its top or lowest position. It doesn’t matter, that this high end low end position of the swash-plate is not used completely later, as using some cyclic pitch angle as well, the swash-plate would bind.
The bad news is, there are some eCCPM systems, where the linkage from the elevator-lever to the steal-ball on the outer swash-plate position to control the elevator-movement is a steal-linkage with 2 ball-links on its end. Unfortunatelly in such a case, you will completely depend on the MFGs stated linkage-length and having the swash-plate at the right position later on ? Often this is not the case, so either you buy one of this tools being pulled inbetween the swash-plate and the upper-frame-plate to find the right swash-plate height (L) or you will set-up all of your linkages on the main-rotor forth and back until finding the right swash-plate height ? Pretty anoying thing .. :arggg:
The good news, the Aeolus-50 3D, Vibe-50 and T-Rex 600 Nitro Super Pro/ LE all use a fix-length elevator-arm-design (arm and lever) and considering you completely tightenend the ball-link sitting on its top, finding the right height of the swash-plate for symmetrical collective pitch range is cake w/o even to care about the MFGs linkage length indications .. :cheers
So how to proceed ? Take a look at the picture attached:
1.) Draw an imaginary line (or use same light-colored tape) from the centre of the elevator-arm’s (lever) pivoting and parallel to the horizontal edge of the frame-sides (in other words: rectangular to the main-shaft). Don’t be afraid, the centre of the shoulder-screw (fixing the elevator-arm on the elevator-arm-lever) is neither in the centre of the circle in the side-frame (compare picture) nor has is the angle inbetween the elevator-arm and its lever completely rectangular. BTW: this is an unperfect design-geometry and not something you built together the wrong way.
2.) The heigth of the elevator-arm to the swash-plate is now right the Zero-Alignement heigth (L) to get symmetrical collective pitch range.
3.) To align horizontally the swash-plate of being rectangular to the main-shaft, you only need to adjust the 2 aileron linkage-rods from its levers to the 2 steal-balls on the outer ring of the swash-plate. If you do not trust your eyes, you can even make use of a swash-plate alignement tool sold by Align, Canomod etc.
4.) Considering your servo-horns were aligned well even w/o using Sub-trimm-function (this is not part of this procedure here) and you setup your main-rotor linkages and levers for Zero-degrees-alignement well, you should get symmetrical collective pitch output.
As a base-line for comparison: I get +/- 12 degrees of collective range and about 10 degrees of cyclic range - although my cyclic-range was limited to 8 degrees, as I'm not into hard 3D. :)
After finding the perfect lengths of all linkage rod, there’s a very easy and cheap way to make a tool to reproduce perfect linkage-lengths for your Aeolus-50 3D .. very usefull after a crash, when linkages are missed-in-action ..
Best Regards,
Oliver
Did you ever trust any MFGs linkage lengths indications stated in the manual ? For a 3D-bird the big deal setting up the main-rotor linkages is mostly to find the right height (picture – height *L*).
The right height is the one, if setting all levers, flybar-cage, flybar etc. lateral or parallel to the main-shaft (throttle-stick on Tx in the mid - pitch curve default setting), as well as having the main-blade grip at Zero-degree collective the way, the swash-plate will deliver some symmetrical max./ min. collective pitch angle for the main-blades. This means e.g. to have +/- 12 degrees of collective when swash-plate is moved to its top or lowest position. It doesn’t matter, that this high end low end position of the swash-plate is not used completely later, as using some cyclic pitch angle as well, the swash-plate would bind.
The bad news is, there are some eCCPM systems, where the linkage from the elevator-lever to the steal-ball on the outer swash-plate position to control the elevator-movement is a steal-linkage with 2 ball-links on its end. Unfortunatelly in such a case, you will completely depend on the MFGs stated linkage-length and having the swash-plate at the right position later on ? Often this is not the case, so either you buy one of this tools being pulled inbetween the swash-plate and the upper-frame-plate to find the right swash-plate height (L) or you will set-up all of your linkages on the main-rotor forth and back until finding the right swash-plate height ? Pretty anoying thing .. :arggg:
The good news, the Aeolus-50 3D, Vibe-50 and T-Rex 600 Nitro Super Pro/ LE all use a fix-length elevator-arm-design (arm and lever) and considering you completely tightenend the ball-link sitting on its top, finding the right height of the swash-plate for symmetrical collective pitch range is cake w/o even to care about the MFGs linkage length indications .. :cheers
So how to proceed ? Take a look at the picture attached:
1.) Draw an imaginary line (or use same light-colored tape) from the centre of the elevator-arm’s (lever) pivoting and parallel to the horizontal edge of the frame-sides (in other words: rectangular to the main-shaft). Don’t be afraid, the centre of the shoulder-screw (fixing the elevator-arm on the elevator-arm-lever) is neither in the centre of the circle in the side-frame (compare picture) nor has is the angle inbetween the elevator-arm and its lever completely rectangular. BTW: this is an unperfect design-geometry and not something you built together the wrong way.
2.) The heigth of the elevator-arm to the swash-plate is now right the Zero-Alignement heigth (L) to get symmetrical collective pitch range.
3.) To align horizontally the swash-plate of being rectangular to the main-shaft, you only need to adjust the 2 aileron linkage-rods from its levers to the 2 steal-balls on the outer ring of the swash-plate. If you do not trust your eyes, you can even make use of a swash-plate alignement tool sold by Align, Canomod etc.
4.) Considering your servo-horns were aligned well even w/o using Sub-trimm-function (this is not part of this procedure here) and you setup your main-rotor linkages and levers for Zero-degrees-alignement well, you should get symmetrical collective pitch output.
As a base-line for comparison: I get +/- 12 degrees of collective range and about 10 degrees of cyclic range - although my cyclic-range was limited to 8 degrees, as I'm not into hard 3D. :)
After finding the perfect lengths of all linkage rod, there’s a very easy and cheap way to make a tool to reproduce perfect linkage-lengths for your Aeolus-50 3D .. very usefull after a crash, when linkages are missed-in-action ..
Best Regards,
Oliver