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HelicopterMain Discussion › Raptor 90 pitch setup (3D version)
12-01-2007 10:12 AM  9 years agoPost 1
DIJ

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I have just finished building a Raptor 90 (3D version) and have a couple of questions.

First, the main blade holder arms start hitting the flybar control rods (hoops) when the pitch is anywhere between 0 and full negative. i.e. when the pitch is set to -9 I can only tilt the flybar arm about half of it usual travel before arm of the main blade holder hits the side of the hoop. Is this normal?

Secondly, when setting up the pitch, how do set up the mixing levers at zero degrees pitch. I read in another post for a raptor SE that the balls on the levers should be parallel to the flybar, is this the same for the Raptor 3D?

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12-01-2007 11:10 AM  9 years agoPost 2
Jeff polisena

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They do get some rubbing if you built to manuel the 90 is easy to set pitch disconnect pitch lever from servo put stick on TX at 50% move arm on servo so that it is parallel to heli without sub trim make sure your pitch curve is 0% to 100% if you are close use sub trim to get arm level you should only need a little sub trim if any now go to ATVs go to full pitch and line up ball link to pitch arm then do the same for full negative adjust linkage rod and ATVs until you have same ATVs for + & - pitch this should give you 0 degree at half stick you will need to make small adjustments do this on your long rods from swash to mixing levers my length is about 110 mm all rod need to be same length then you track blades with pitch links ask if you need more info

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12-01-2007 12:28 PM  9 years agoPost 3
DIJ

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Thats excellent info Jeff, and much easier than the way I was trying to do it.

I have set the servo arm level but had to use a subtrim of 10 as I am using a metal arm so don't have the usual four points to rotate/improve it. Do you think thats ok?

Also, the pointer on the servo tray is way lower than the zero mark on the raptor body, is that normal?

Thanks for your help, its much appreciated.

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12-01-2007 12:41 PM  9 years agoPost 4
Jeff polisena

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your wanting to get same travel +&- and ATVs the same so the transition is same what TX are you using ? lines on TX at stick base you should hover just before you get to first mark past half when you hover and test fly everything feels fine and you can flip and climb out inverted test so climb out feels the same in both inverted and rite side up your throttle curve should be at 40% mid stick to start to be close to 1850 headspeed dont know if this helps ask if you need to

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12-01-2007 01:10 PM  9 years agoPost 5
DIJ

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Thanks again Jeff, and yes it does help. I'm using a 9C super TX.
I understand what you're saying about the pos/neg pitch movement being symetrical, I just wasn't sure about the pointer on the servo tray being quite a bit lower than the body mark.

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12-01-2007 01:14 PM  9 years agoPost 6
Jeff polisena

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sorry ,yea dont worry about mark just check for binding before you hit it hard

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12-01-2007 01:33 PM  9 years agoPost 7
DIJ

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That really is a simple way to set the pitch up, even the washout arms were level when I had finished

Do you have any info on my other queston?

"how do set up the mixing levers at zero degrees pitch. I read in another post for a raptor SE that the balls on the levers should be parallel to the flybar, is this the same for the Raptor 3D?"

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12-01-2007 06:22 PM  9 years agoPost 8
CBell

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DIJ,

When the flybar is level the mixers should also be level. Change the length of the long rod connecting the mixer to the swashplate to adjust the arm up/down. Once you've got them positioned properly adjust the short rod to the blade grip to get 0 deg pitch.

Colin

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12-01-2007 06:24 PM  9 years agoPost 9
Jeff polisena

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If you do all I mentioned they should be fine fly bar has notches in it and all should bolt rite together and be fine I might be misunderstanding what your asking keep in touch

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12-01-2007 06:41 PM  9 years agoPost 10
DIJ

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Thanks for all the input guys.

Colin,
I have just levelled out the swash, washout arms and the top mixing levers at zero pitch, but it would seem that by making the mixing levers (balls) Parallel with the flybar I have a another problem....

At +9 degrees pitch and when I apply cylic over about 5 degrees the top plastic ball link on the long links hits the top square part of the rotor head.

It looks to me that the only way I can remedy the problem is to increase the length of the long links to increase the clearance a little.
I will give this a go later tonight. BUT, this will of course mean that the mixings levers will no longer be Parallel with the flybar.

Can you tell me if the levers on the 3D raptor are supposed to be level? Any other suggestions? am I missing something?

Thanks

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12-01-2007 07:04 PM  9 years agoPost 11
Billebob

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Tim-buck-2

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At +9 degrees pitch and when I apply cylic over about 5 degrees the top plastic ball link on the long links hits the top square part of the rotor head.
It should just rub at maximum flybar tilt with max swashplate tilt at maximum low swashplate position on the mast. That should be at way more than +9 degrees. How bout a picture. The flybar will never tilt that far in flight either.

bb

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12-01-2007 07:14 PM  9 years agoPost 12
Jeff polisena

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At this point we need a picture it would really help

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12-01-2007 07:36 PM  9 years agoPost 13
DIJ

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[It should just rub at maximum flybar tilt with max swashplate tilt at maximum low swashplate position on the mast. That should be at way more than +9 degrees. How bout a picture. The flybar will never tilt that far in flight either.
There must be something wrong here as I when I switch to thro hold at around 10.5 degrees the flybay will barely go level, let alone tilt in the other direction.

I will try and post pictures later tonight, really appreciate all the help.

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12-01-2007 08:19 PM  9 years agoPost 14
Jeff polisena

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sounds like you have arm upside down I will send a picture latter
This might help I will send a better one
http://www.runryder.com/rrpw.htm?d=...&s=-Welcome.txt

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12-01-2007 09:52 PM  9 years agoPost 15
DIJ

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Here’s the photos then, please let me know if you see anything wrong

1 aileron crank 0 degrees pitch/cyclic

2 Swash/washout 0 degrees pitch/cyclic

3 Flybar 0 degrees pitch/cyclic

4 Pitch 9 degrees / swash 7 degrees showing top of link rod hitting rotor head. Flybar is level but will not tilt any further.

5 Pitch 10.5 degrees / swash 7 degrees showing top of link rod hitting rotor head. Flybar cannot even be set level and photo shows the maximum it will move forward with swash

Do you know if I should be fitting the mixing levers to the inner or outer holes on the flybar arm? the manual states the outer holes for standard and the inner ones for aggresive 3D
I am using the standard ones as I'm still only into mild 3D at the moment, but it looks like if I moved to the outer holes I would also gain some more clearance with the long links.

Thanks again for all the help.

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12-02-2007 01:33 AM  9 years agoPost 16
Jeff polisena

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everything looks fine you should be able to spool up, adjust and fine tune

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12-02-2007 02:06 AM  9 years agoPost 17
CBell

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Nova Scotia, Canada

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You're much better with a camera than I am! For the life of me I can't get good pictures. The link just barely rubs on the head block at full negative pitch, full forward cyclic and full flybar tilt. I do have my mixers a little bit higher than you. Mine are not exactly level.... I thought they were. It's been a while since I set it up

Colin

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12-02-2007 10:47 AM  9 years agoPost 18
DIJ

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I have been told that the mixing levers should NOT be level at 0 pitch, but the rods should make a 90 degree angle. I will try this as it will improve the clearance.

will let you know how I get on.

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12-02-2007 11:59 AM  9 years agoPost 19
DIJ

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Just lengthened the long links so the mixing arms are no longer paralell with the flybar, and I can now tilt the flybar within a few degrees of its stop, so that seems to be the answer to this problem.

The only remaining problem I have is that with -9 pitch and max or min elevator (6.5 degrees swash travel) the arm on the blade holder hits the hoops so that the flybar will only just tilt to the level position, but no further.
Is this normal?
If anyone can check this for me I would be very greatful.

Position flybar in line with boom, then Idle up, throttle full back, full back elevator.
Now check the available flybar tilt, the front end of my flybar will tilt to the end stop, but the rear end will not go any further than level (i.e. the flybar is paralell with the boom).

Thanks again for all the support you guys have given, it really does help.

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12-02-2007 12:10 PM  9 years agoPost 20
Billebob

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DIJ,

Just adjust the mixers like in Colin's pictures and go for symmectrical range using the short control rods to the blade grips.
At zero collective and half travel in the oval sideframe slots the top surface long of the mixer should be close to level and the collective servo arm at 90 or horizontally level. That will get you well into the ball park. The grips will bump the plastic oval links at full flybar teeter with full cyclic at low swashplate position on the mast(in the syncronized teeter direction as occurs in flight).

bb

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HelicopterMain Discussion › Raptor 90 pitch setup (3D version)
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