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Thunder Tiger Raptors 30-90 - Imperio > Raptor 30 - Need help with Pitch Setup!!!
 
 
Bird_E
Senior Heliman
Location: Erie, CO

Hello everyone,
I'm a complete beginner just finishing up building my raptor 30. I'm in the process of setting up the servos and linkages. I have followed the instructions on raptortechnique for the basic radio setup. Now I have problems setting up the pitch of the main blades.... Well, I don't know if I'm having a problem, but something just doesn't seem right. So here it is. I have a futaba 9 CHP with 9001 servos. On the collective servo I have the link at 90 degrees to the wheel and the built in pitch gauges reads at the 6 degree hover mark when the collective it set at half way. So far so good. Now, when setting the blade pitch (using a helimax picth gauge) to six degrees I'm having a difficult time because the "play" or "give" in the collective mechanism allows me to move the blade pitch plus or minus 3 or 4 degrees (with some resistance but not much) ..... is this ok.? if so how do you accuratelly set the pitch? or is it not that critical? The other question that I have is about using the pitch gauge. If I level and clamp the fly bar from moving ( I put a little bubble level on the fly bar then clamp it in that position), I then glued a small bubble level on the helimax picth gauge, then I hold the pitch gauge level and take a reading. (I didn't like the idea of eyeballing the top of the pitch gauge to the level fly bar. Does this sound ok?? am I doing it correct?
Next concern.. After setting the blade picth to about 6 degrees, as accuratley as possible, I then moved the collective stick up and down......... MAN, The blades move almost 30 - 40 Degrees +/-!!! Does this sound correct! OK, I know I can restrict this movement by setting my pitch curve percentages in the radio, but when I do this I really restrict it to obtain 0-6-9 pitch setup. I mean the percentages on the radio only range from about 45% to 65%. Once this is done... and I move my collective stick things seem to be working correctly. But as a sanity check, 0 - 5 - 9 ...... it doesn't seem like the blades move very much (pitch) looking at them ...... Again, does this sound correct?
However, if I give a full right or left aileron stick.... the blades will pitch over to 30 - 40 degrees (ok, maybee no that much .... but ALOT!!!).
Sorry for the long post, I just wanted to get my point across as clear as possible.
So, Am I on the right track??/

Thanks a million!
Bob

04-23-2002 Over year old.
 
 
Doug
Elite Veteran
Location: Naples Florida....

It's tough to get more than +- 11 deg using the full travel of the collective tray so something is not right in your methods or your washout is not conected correctly. Be sure and keep the flybar level during measurement.
04-23-2002 Over year old.
 
 
drtoothfixer
Senior Heliman
Location: Richland, WA

I agree with Doug. I haven't been doing this long, but it sounds like your methods are a bit complicated for the task. One other thing to check: be sure you are measuring pitch with the blades parallel to the fuselage/tail boom. Don't worry about the pitch measurements on the built in pitch guage. I just built my first raptor, and had a very experienced pilot help me set it up. I put my collective servo in with teh wheel facing the tail (opposite the instructions) and placed the ball link on the closest position on the collective arm (not the end one, like the instructions showed). Then, at mid throttle, I set it all up at right angles, and ended up with about 0 degrees pitch just below mid throttle, and at full, I'm at +10, and at bottom, about -10. This makes the machine capable of great maneuvers, but also very easy to learn on, as long as you don't panic and pull down on the collective stick in a bind. You will bury your machine into the ground if you do. Try to measure the pitch of your blades eye-balling the flybar and with the blades parallel, like I said. You may find that you are closer than you think, and that you aren't getting so much pitch change. If you still are getting that much pitch, look CAREFULLY at how you have set up the collective, and review the instructions. As we say "measure twice, cut once". Have fun! Trevor
04-23-2002 Over year old.
 
 
Bird_E
Senior Heliman
Location: Erie, CO

OK, some more questions

If you remove the collective link from the servo and move the arm up and down manually, how much pitch can you get out of the raptor 30?

If I do it, I get around 25 - 30 Degrees, while holding the flybar level, of course! Do I have some thing wrong?

Also, should I just set the ATV in my radio so I only get +/- 11 degrees or so?

Thanks!
Bob.
04-23-2002 Over year old.
 
 
psawya
Key Veteran
Location: Pyongtaek, Korea

It may just be best to move your link position out on the servo wheel a little more. That will give you more throw. Then use ATV/End point adjustments to get the min / max pitch range.


Pete
04-24-2002 Over year old.
 
 
dwaynet
Senior Heliman
Location: Fairfax, Virginia

Quote 
If you remove the collective link from the servo and move the arm up and down manually, how much pitch can you get out of the raptor 30?

If I do it, I get around 25 - 30 Degrees, while holding the flybar level, of course! Do I have some thing wrong?



bberg,

It is impossible to get more than a 24 degree window on the stock raptor, that I know of. This means -12 to +12 is as much as you can possibly get. If you are reading more than a 24 degree "window" then you are doing something wrong. Heck, I'm lucky to get a 22 degree window.

Dwayne
04-24-2002 Over year old.
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Thunder Tiger Raptors 30-90 - Imperio > Raptor 30 - Need help with Pitch Setup!!!
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