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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › Forward Rake and Centering Main Shaft
10-16-2017 09:36 PM  25 months ago
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zonker

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South Jordan, UT USA

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Forward Rake and Centering Main Shaft
For those with helis that have a forward rake like the Goblins do you center your main shaft before you center the swash and set zero pitch?

I found a video that shows a method for centering the main shaft but I'm curious how most set up forward rake helis. Do you even worry about centering the main shaft?

Watch at YouTube

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10-16-2017 09:42 PM  25 months ago
dgoss999

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UK - Lancashire

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I usually prop the mechanics up so the mainshaft is vertical. Once this is done, setting the pitch with electronic gauges is pretty simple.

DG
"Believe none of what you hear, and only half of what you see." • Benjamin Franklin
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10-16-2017 09:51 PM  25 months ago
870heli

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Monson Ma. USA

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Same here. Never had a problem.
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10-16-2017 10:07 PM  25 months ago
ssmith512

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Indianapolis, IN USA

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zonker Do you even worry about centering the main shaft?
Nope. Never have. Probably never will.

FYI - it's called plumbing the mainshaft. Centering is not even close to what is being described.
Steve
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10-16-2017 10:46 PM  25 months ago
EEngineer

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TX

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You don't need to level the heli on the workbench to set zero degrees pitch at mid-stick.

The swash just needs to be orthogonal to the main shaft....your main shaft doesn't need to be orthogonal with your work bench.

Use a swash leveler to ensure your swash is orthogonal to your main shaft, from full neg. through mid-stick to full positive collective.

While doing the above, also ensure that you have equal swash movement from mid-stick to full neg. collective and from mid-stick to full pos. collective.....for 3D type helis.

Using turnbuckles makes this a lot easier to precisely accomplish.

Next, use a straight, round tube or shaft to insert in your blade grip bolt holes. Ensure it fits in the holes with as little slop as possible.

Adjust your blade grip links such that the shafts in the grip bolt holes are parallel to the main shaft at mid-stick. Again, using turnbuckles makes this very precise.

Now, when you fold your main blades back in the rotor head with the TX at mid-stick, very little mechanical adjustment is necessary to have the blades parallel to each other with no tip spread, measured around the "clock" of rotor head rotation.

Make mechanical adjustments as close as possible rather than have the FBL "tune" this via its software.

Remember, your FBL has no way of knowing that your mechanical adjustments are "fubarred".....so be mechanically precise.

FWIW
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10-17-2017 12:58 AM  25 months ago
MattJen

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UK

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???

some do like to make it complicated.
All The Best
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10-17-2017 01:09 AM  25 months ago
dgoss999

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zzzzzzzzzzzzzzzzz... So much typing for a simple pitch adjustment.

I'm only an apprentice, but does orthogonal here mean "square"?? And do you guys really let the collective servos take the full weight of the blades folded back?? Why not replace the blades with short lengths of square section balsa to true the blade holders with each other??

DG
"Believe none of what you hear, and only half of what you see." • Benjamin Franklin
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10-17-2017 01:11 AM  25 months ago
MattJen

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dgoss999 zzzzzzzzzzzzzzzzz... So much typing for a simple pitch adjustment.
LOL LOL

I dont take any REAL notice of the RR Levels, a poster maybe an apprentice here cos they don't post much but having read what little posting they have done they have been in the hobby for many years...
All The Best
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10-17-2017 01:29 AM  25 months ago
utahbob

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St. George Utah

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Whew!!
My head is spinning..Orthoganal?..centering a mainshaft?..this stuff was foreign to me..wait a minute. .how long was I gone when the aliens took me this time?..
I do a great decending funnel!
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10-17-2017 02:04 AM  25 months ago
EEngineer

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TX

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some do like to make it complicated.
What's so complicated?

The question was asked....and I answered....

Besides....I like my rotor head to be setup mechanically precise.....

Do you mean to say that you waste inordinate amounts of time precisely leveling your heli to make these adjustments....or worse yet, to make some sort of "heli leveling fixture" that I've seen before....

Rather than just do what I tried to explain? Which is much easier....and less prone to error.

Each to his own, I guess....

But before you knock it, try it.....
Logo 600SXs, 800XX, TDR IIs
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10-17-2017 02:06 AM  25 months ago
ICUR1-2

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Ottawa, Ontario

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And do you guys really let the collective servos take the full weight of the blades folded back?

I lay the model on it's side orthogonal to the table and let the blades hang
spending time, paying attention
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10-17-2017 02:07 AM  25 months ago
EEngineer

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TX

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does orthogonal here mean "square
It's a simple way of saying it's at 90 degrees in 2 axis.....

In this case both the roll and pitch axis.

Depends on the torque of your servos and you can always support the blades slightly.
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10-17-2017 02:09 AM  25 months ago
EEngineer

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TX

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Why not replace the blades with short lengths of square section balsa to true the blade holders with each other??
Because they're not the blades you use.....and could lead to errors....imo
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10-17-2017 02:10 AM  25 months ago
EEngineer

rrProfessor

TX

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Orthoganal?..centering a mainshaft?..this stuff was foreign to me
Where are you from?......
Logo 600SXs, 800XX, TDR IIs
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10-17-2017 02:12 AM  25 months ago
EEngineer

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TX

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zzzzzzzzzzzzzzzzz...
No big deal....
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10-17-2017 02:24 AM  25 months ago
MattJen

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UK

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6 posts to answer LOL

you crack me up EE, no wonder you made professor in a short time.. LOL LOL

All your posts yet never seen a video of you flying
All The Best
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10-17-2017 02:26 AM  25 months ago
EEngineer

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TX

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I should have known, though....

Any time someone asks about this subject, there's always such arguments.....LOL

Other than it's not the way you folks do it, tell me what I said was technically incorrect....

I say, to each his own....but with the way I described, my blade tracking is always dead on.....on the first flight....so I think I will continue to do it my way....lol
Logo 600SXs, 800XX, TDR IIs
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10-17-2017 03:55 AM  25 months ago
zonker

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South Jordan, UT USA

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Thank you for all the responses. With a rake forward heli, I make sure my swash is level using a swash plate level tool and I don't bother with the main shaft. I think I do it this way because I like seeing the landing skids parallel to the ground in a hover. But after seeing the video that I included with my original post, I got curious about other methods. It seems by following the video instructions you’d be able to level the swash without removing the head. Kind of like with the zip tie method which I think requires the main shaft to be vertical (or plumbed?) to the workbench, first.
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10-17-2017 11:51 AM  25 months ago
ssmith512

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Indianapolis, IN USA

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zonker Kind of like with the zip tie method which I think requires the main shaft to be vertical (or plumbed?) to the workbench, first.
Mainshaft does not need to be plumb.
Steve
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