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HelicopterMain Discussion › pitch issues... could it be the blades???
06-05-2010 06:09 PM  7 years agoPost 1
hammer45

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apollo, pa. 15613

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got a t-rex 450 v2. no matter what i do i always end up with a full degree of pitch more on the negitive side. why? could it be the blades???

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06-05-2010 06:14 PM  7 years agoPost 2
fflier9

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Wauwatosa, WI USA

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no it's not your blades. You need to lower the swash at mid stick and then reset the blades for 0 degrees at mid stick.

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06-05-2010 06:17 PM  7 years agoPost 3
stang281472

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Commack, NY

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Are you checking both blades and is it same on both? Usually thats a sign of something being off in the mechanical setup.

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06-05-2010 06:18 PM  7 years agoPost 4
stang281472

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Commack, NY

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+1 to fflier9's suggestion

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06-05-2010 08:03 PM  7 years agoPost 5
hammer45

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apollo, pa. 15613

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pitch issues

i tried to lower the swash and everything. i've had my links on and off so many times tring to get it right that i am close to replacing all the links for fear of looseness and failure this is the third time i have set this 450 up and the first time i have had an issue. i mean i've got HOURS tring to set this up and don't know what gives. you know then again if i wouldn't have been fling it at 1 in the morning and lost it in the dark i wouldn't be having the trouble i am having now huh?? i guess you live and learn...

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06-05-2010 11:35 PM  7 years agoPost 6
cudaboy_71

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sacramento, ca, u.s.

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here's a tip when you need to adjust all your links:

work from the bottom of the swash upward.

that is, when adjusting the links start with the servo to swash links. after getting those right, move up to the inner swash to mixer arms; then mixer arms to flybar cage, and lastly upper arms to grips.

since you have more negative than positive collective--provided swash up is positive pitch-- your swash is mechanically too high. start by shortening your servo to swash links.

to adjust the rest of the links, put your collective stick at *EXACTLY* midstick (use your pitch curve menu output values or your servo monitor menu).

now begin working on the links from the bottom up as mentioned before. you need to now readjust all the links so the upper and lower arms are exactly horizontal, and the blades are zero degrees.

now measure your pitches again at high and low stick. still not right? repeat the complete routine above until you get it right. not an easy process, but worth it if you want a right-flying heli.

this is basically what fflier9 stated. but, if you just lower the swash and your blades back to zero (adjusting only the upper arm to grip links) without readjusting all the links back to horizontal you'll have some interactions in the cyclics.

if it ain't broke, break it.

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06-06-2010 04:38 AM  7 years agoPost 7
hammer45

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apollo, pa. 15613

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pitch issues

thanks for the feedback guys... to many blurry eyed late nights staring at pitch gages will tend to wear you out abit i guess you guys know better than me so i will give it another whirl... funky blades was a bit of a reach huh

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06-06-2010 04:49 AM  7 years agoPost 8
Spitfire1

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Perth Australia

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i've had my links on and off so many times tring to get it right
Ive built some heads and its been a five minute job, and then others have taken hours screwing around like you are.

I think sometimes your eyes can deceive you, specialy if youve been at it for a long time.

It doesent matter how accurate the pitch gauge is, it still takes human eyes to read it and they are not perfect, get it as close as possible, if its within 1 degree you may find it will fly perfect, it may take up to a degree of adjustments to track properly anyway.

I find I can read 10.5 degrees, remove the pitch guage and put it back on again jiggle the collective around and read 11 degrees, slight play in the links + human error, I try as hard as possible to get it spot on as i can without becoming enraged and then try it, often after the first flight things may stretch in and need adjusting again anyway. I think the smaller the heli the harder it is.

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06-06-2010 05:01 AM  7 years agoPost 9
Spitfire1

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Perth Australia

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Hang on a minute If you getting 1 degree more on both blades at negative than positive, why dont you just adjust your pitch curves to make it correct?

Its highly unlikely your mechanical setup will be so perfect that your swash mix alone will give you exactly 11 degrees each way, if your top point is 100%, your low stick point may need to be 4% or whatever it happens to be to get the correct pitch.

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06-06-2010 10:44 AM  7 years agoPost 10
Jeff polisena

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westpalmbeachflorida usa

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Pitch gauges will get you close , as long as you are 0 at half and all links are same on opposing sides with a liner curve ,no binding you should be ok . Track blades if needed you might need to turn link 1 turn to track any more I would look at set up again . To find 0 at center, fold blades back and tips should line up with swash and arms at 90 deg angles . I then fly and do climb outs inverted and rite side up to get the same in both directions . I would not use TX to correct any pitch or mechanical issues.

I stole it ,flew it and gave it back ;)

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06-06-2010 01:03 PM  7 years agoPost 11
Heli_KV

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Ottawa, Canada

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Correct me please if I am wrong, but if servos travel were adjusted to make swash level at high and low, it is possible, that servos have unequal travel in 'up' and 'down' directions, which will result in unequal positive and negative pitch.

Also, about mixing arms: they should not be parallel, bat rather 90 degrees to correspondent link, which pushes them. The same as we do with servo horns - 90 degrees. At midstick for sure. Different heads - different geometry. Some heads mixings arms are parallel, in some heads - no. But everywhere 90 degrees. Outrage head is a sample, when arms are not parallel. For example: http://www.helituning.com/index.php...d-geometry.html

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06-07-2010 01:26 PM  7 years agoPost 12
Jeff polisena

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westpalmbeachflorida usa

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Only if you mechanical setup is off , if you have a liner pitch cure atvs at 100 / 100 half at 0 deg level swash you should be fine after this using atvs to get level at top and bottom should not effect full range

I stole it ,flew it and gave it back ;)

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06-11-2010 04:00 AM  7 years agoPost 13
hammer45

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apollo, pa. 15613

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pitch issues

thanks all...

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