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Other › Pitchy Head Syndrome
02-09-2006 02:23 AM  12 years agoPost 1
TomRex

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West Palm Beach Join Date: 12-28-2005

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Guys, Does your Rex tend to be pitchy when transitioning form pos pitch to neg pitch? I mean SLOPPY! My thoughts are up is up and down is down but the slop in between is Very uncomfortable! Is it the Align machine work again or is it just My T-rex? Wuddia say andy? Guys?

SE w/56's all around and their tight (no slop)But again just like my tail blades I can jiggle the pitch on the blades about an eigth inch. Kryps a mighty my Hornet is jam up so whats with the Align stuff?

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02-09-2006 02:57 AM  12 years agoPost 2
TomRex

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Finless Bob, (I liked your story about your screen name btw) The transition is jumpy to say the least. I'm no pro but I do have alot of expierence at machine work. I can grab the blades and jiggle them up and down a heavy eigth inch, and while flying the thing seems to jump and/or leaving me to really stay on the sticks to keep things smooth. Is that whats to be expected from a 450 SE or is it just my pinsion for perfection? Tj

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02-09-2006 03:00 AM  12 years agoPost 3
lavarocks

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Rochester, NY

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You will have to stay on the sticks, and pitch does feel very sensitive at first.

Have you had anyone hover it or fly it to see if it's the helicopter's fault?

- chuckyteets

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02-09-2006 03:05 AM  12 years agoPost 4
TomRex

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Yes lava and he was the one to bring it to my attention, the more I effed with it the more I really don't care for it and am wondering how to fix it without regretting my purchase even tho I've had it a couple months now.

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02-09-2006 03:09 AM  12 years agoPost 5
Caliber1

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Fort Worth, TX

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Make sure that your ball links are not too tight as that can contribute to twitchy transitions during flight control input.

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02-09-2006 03:25 AM  12 years agoPost 6
TomRex

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West Palm Beach Join Date: 12-28-2005

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Caliber, Balls are setup correctly and greased too! Smooth....
Would you guys please when preflighting please check your end play by rotating the blades LIGHTLY by hand, before connecting the battry and try to post your results here. I'm gonna dissasemble the head and do some tolerancing and figure this out because this machine is 2 months old and 20-25 flights. My Align expierience is not happy at this time..

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02-09-2006 03:41 AM  12 years agoPost 7
TomRex

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Finless, Thats what I'm talking bout! Your articulation is much more articulate, excuse me please. mine is about a heavy eigth on both the main and tail equally thats my b!tch presently. Flap I'm not worried but twist I am. Its a matter of stacked amount of tolerance of all the parts that Align doesn't seem to see in their product.

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02-09-2006 03:43 AM  12 years agoPost 8
demosa

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Tigard, Oregon, U.S.A.

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Could it be that you have "reverse" expo programmed in ?
I.e. the pitch control is very sensitive around 0 degrees ?
(assuming you are running a totally symmetrical setup like
-10 to +10 for example).

Demos

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02-09-2006 03:53 AM  12 years agoPost 9
TomRex

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West Palm Beach Join Date: 12-28-2005

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Demosa, I havent even tried to invert with craft. But in checking What I call hopping, Standard level hover then jam up and down in rapid moment, the response between pos to neg pitch has a very wierd pause with a jump into movement. now when in hover then jamming to rapid throttle,pitch/forward the thing is the most responsive thing I've ever flown I can sport it forever but don't trust the wierd lagtime in pitch transition for 3D. Tj

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02-09-2006 04:07 AM  12 years agoPost 10
demosa

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Tigard, Oregon, U.S.A.

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Could it be that the washout hub that rides on the main shaft below the head block sits a little too low and as a result it almost "escapes"
the head block pins that are supposed to hold it in place ?
This could explain why you get that pause in response time
while the hub is trying to get "re-aligned" with the guide pins.
It could also explain why you notice this with rapid pitch stick movements...

Just an idea ...

Demos

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02-09-2006 05:38 AM  12 years agoPost 11
dkshema

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Cedar Rapids, IA

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CG of the blades in the "wrong" place, maybe? Too far back from the leading edge?

Dave

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02-10-2006 12:29 AM  12 years agoPost 12
TomRex

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West Palm Beach Join Date: 12-28-2005

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Fin, Yes it is above the swash (head), the tail slop is after the slider arm.
Dem, pins are within the throw limits.
Dksh, do you mean lateral balance from LE to TE?

Hey! thanks you guys.

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02-10-2006 01:07 AM  12 years agoPost 13
dkshema

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Cedar Rapids, IA

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Tom rex -- yes..chord-wise CG.

Dave

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02-11-2006 02:38 AM  12 years agoPost 14
TomRex

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West Palm Beach Join Date: 12-28-2005

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Fin, I think the wash out block bushing has too much slop same goes with the tail pitch slider bushing. I'll have to check farther with the arms ect. Thanks Tj

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