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HomeAircraftHelicopterHIROBOOther › How to get +/- 11 degrees of collective pitch for Xspec?
09-12-2003 03:15 AM  14 years agoPost 1
yapjy

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Singapore

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Hi,
Details:
1)lower hole on the main mast
2)inner hole on the pitch lever that transfers the collective pitch servo movement to swash plate movement. I followed the example on MHW.
3)Mixing arm rod and stabiliser arm rod are extended by 10mm because I use the lower hole on the main mast.
4)linkage rod between the collective pitch t lever and pitch lever is adjusted so that it gives 0 degrees at 1/2 stick.

However, I can only get +/- 9 degrees of collective pitch. I have been screwing around with the rod lengths for the whole week and I still can't get +/- 11 degrees.

Any help?

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09-12-2003 03:40 AM  14 years agoPost 2
MrDHEJ

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Taylorsville, Kentucky, USA

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I go by the manual and use the 185mm bolt hole spacing in the main shaft "that's the upper ones" and i can get about +-14 with 1/2 stick at 0 using the long throw holes.

I don't have my heli in front of me but i know i'm using the middle hole on the t-lever, inner hole on the collective pitch lever. I centered the elevator torque lever in the frame window by adjusting the rod from t-lever to colective lever. then adjusted all other rods so the mixing arms, washout control arms, and cross member were level. Finnally adjusting the pitch rod going to the blade grips to get 0 with +-12 total.

Hope this helps

Never go full retard!

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09-14-2003 02:27 PM  14 years agoPost 3
yapjy

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Singapore

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Hi,
I'm using the lower hole on the main mast. This means that it is 195mm long. Theoratically, if I extends the mixing arm rod and stabiliser control arm rod by 10mm, I should get more than +/-9 degrees.
However, I am still not getting that. My mixing arm rod is 57mm. My T-type lever rod is 52mm. I obtained the length for the t-type lever rod by putting 50% pitch and adjusting the rod until I get 0 degrees. However the manual mention 42mm(47mm for SST Eagle Freya). Which one should I follow?
The pitch rod at the blade grips is 0.5mm as suggested by the manual. All other rod length are as suggested by the manual. Even the servo horn lengths are according to the manual.

Sigh....I prefer flying then tweaking.....

I hope someone who is using the 195mm hole can assist me.

Why I use the lower hole? Because my X-spec was bought used and the previous owner used the lower hole.

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09-14-2003 03:08 PM  14 years agoPost 4
mrNoodles

rrProfessor

Borlänge, Sweden

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Upper mast hole.
Outer hole on T-pitch lever
Rod 45mm
Inner hole on pitch arm.
Outer hole on washout arms
Inner hole on mixing arms (on the side with the rods coming from the swash)
Inner hole on the other side of the mixing arms
Pitch rod lenght 2.3 mm

Washout arms and mixing arms are level on midstick.

Good luck

I didnt measure the other rods since their lenghts will come automaticly when the arms are level at mid.

/Fredrik
'Hm now I just have to find out where to connect the GV1 sensor to the Jazz80 ESC.

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09-14-2003 04:19 PM  14 years agoPost 5
MrDHEJ

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Taylorsville, Kentucky, USA

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yapjy , I think you’re a little confused about levers and rods.

Rod length has no effect on total pitch. The rod's just change where the 0 pitch will be at.
Where you locate the rod ends on your levers is what will give you more or less travel.

If you look on page 38 of your manual you'll see the setup for the collective pitch linkages. I would first make sure that is correct before continuing. Everything on that page will not be affected by your using the longer holes on the main shaft. Make sure the collective lever is level and the t-lever and servo horn at 90.

Next, adjust the rods going from the washout arms to the fly bar cross members so the arms are level.
Then adjust the rods going from the swash plate to the mixing arms so they are level also

Put your pitch gauge on your blades and adjust the pitch rods so your at 0 degree. At this point you should not have to readjust any of the rods except the pitch rods for blade tracking.

Mount your fly bar lock, turn your power on and make sure with no trim or atv on the collective pitch servo that at center stick in idle up 2 your at 0 degree. If you’re off move the horn. After that, move full up and write down the pitch, go full down and write that down.

Did you have enough travel?
If you’re sure everything above is correct and level
Unbolt the pitch linkage that connects to the pitch lever and put it on the inside hole. Recheck pitch. If that didn't give you enough then move the pitch rod that connects to the T-Lever on the outside hole "the t-lever has 3 holes in it, the farther out the more travel".

If that didn't give you enough pitch then move up to the mixing arms, if you move the rod on the longer arm inward, and the rod end on the shorter rod outward, that would give you the maximum possible pitch. You'll have to play with that to get the amount you want.

But remember, the more overall pitch you have the harder your servo has to work to achieve it. So only take as much as you need and your servo will thank you.

Hope this helps and wasn't to confusing.

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09-14-2003 04:34 PM  14 years agoPost 6
vetrider

rrElite Veteran

Daleville, AL (Ft.Rucker)

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Disconnect your pitch servo and then see if your getting the full range on the collective. Just never know till you do.

Nolan

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09-18-2003 03:20 PM  14 years agoPost 7
yapjy

rrKey Veteran

Singapore

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A Big Thank You to MrDEHJ, vetrider and mrNoddles.

I finally got +/-11 degrees of pitch with my X-spec.

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09-18-2003 03:27 PM  14 years agoPost 8
mrNoodles

rrProfessor

Borlänge, Sweden

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U are welcome yapjy, time for some "asskickin" X-Spec flying then

/Fredrik
'Hm now I just have to find out where to connect the GV1 sensor to the Jazz80 ESC.

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09-18-2003 03:30 PM  14 years agoPost 9
MrDHEJ

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Taylorsville, Kentucky, USA

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Glad to be of help yapjy.

So what was wrong with the setup that you couldn't get 11 before?

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09-18-2003 03:57 PM  14 years agoPost 10
yapjy

rrKey Veteran

Singapore

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I was enlightened by MrDHEJ explanation about the rod length and hole position. I got the entire concept mixed up.

I have the impression that the mixing arm rod and pitch rod control the pitch range. This is not entirely true.
So I remove all the linkage rod again, set up according to MrDEHJ instructions.
I was grinning cheek to cheek when I get about +/-13 degrees of pitch! So I got to turn down the ATV to get +/-11 degrees.

Once again, a big thanks

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09-18-2003 04:10 PM  14 years agoPost 11
MrDHEJ

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Taylorsville, Kentucky, USA

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See, i keep telling people that i'm not Tottaly useless.

Let us know how you like it with that setup. My X-Spec won't see that type of flying for awhile, but it hovers nicely.

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11-09-2003 12:28 AM  14 years agoPost 12
Crashtastic

rrNovice

Tampa, Florida

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Also, adjusting linkage anywhere between the pitch servo to the collective lever will only give you more collective, adjusting anything between the swash and the blade grips (such as the mixing arms) will affect pitch applied with cyclic inputs as well.

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