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HelicopterThunder TigerRAPTOR 50 › Blade response - is this normal...?
08-11-2007 12:03 AM  10 years agoPost 1
djsegler

rrApprentice

Dallas, Texas - USA

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If I punch it and then drop it to let it sink quickly and then immediately keep it in a stable hover, it appears that the blades take a while to come out of negative pitch - even though I'm inputting slight positive to hold the hover...

I can see this by the fact that the smoke gets sucked upward into the blades even though I've stopped the descent and am holding a hover with positive pitch...

That in itself is fine - but what I find annoying is that if I decide to go positive again instead of holding in a hover, there is a sluggish zone and the a sudden pop of pitch...

Do I just get used to this or is this not normal?

I'm using a stock raptor 50 V2 with an OS50H, TT600mm carbon blades, TT Z-Alpha Gov, and a G-force hub (with 90d) dampers... the rest of the head is stock.

I noticed this same thing even when I had the original plastic hub and even without the gov... Maybe this is just a typical head response kind of things and I'll just have to work with it...

Practice = Precision... No shortcuts...

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08-11-2007 12:10 AM  10 years agoPost 2
A. Bundy

rrElite Veteran

Aurora,IL. 30W/SW of​Chicago

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No,You have something wrong.Take the pushrod off the servo and feel for slop or binding.

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08-11-2007 12:10 AM  10 years agoPost 3
rcadd1ct

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Richardson, Texas

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What head speed?

What servos?

What pitch range?

-RCA .......... Making Cuisinarts Fly!!!!!!!

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08-11-2007 12:40 AM  10 years agoPost 4
djsegler

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Dallas, Texas - USA

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I don't think there is any slop.

It's a Futaba S9404 servo on the collective with S9451s on the cyclic. I've rigged up a center post stabilizer as a "poor man's" push/pull...

I'll look more carefully again, but I think it's pretty solid...

Pitch range is +10 / -10. I can't get anymore than that.

Practice = Precision... No shortcuts...

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08-11-2007 03:18 AM  10 years agoPost 5
djsegler

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Dallas, Texas - USA

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Oops - forgot to mention that my headspeed is 1950.

Practice = Precision... No shortcuts...

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08-11-2007 03:21 AM  10 years agoPost 6
rcadd1ct

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Richardson, Texas

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Is the throttle servo faster than the collective servo?

Is the engine in tune so that the throttle response is quick and powerful?

-RCA .......... Making Cuisinarts Fly!!!!!!!

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08-11-2007 03:49 AM  10 years agoPost 7
djsegler

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Dallas, Texas - USA

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I have a 9254 on the throttle... Can't get much faster than that.

It is indeed faster than the 9404 even though it's running off 5.8V.

Practice = Precision... No shortcuts...

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08-11-2007 04:12 AM  10 years agoPost 8
rcadd1ct

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Richardson, Texas

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That leaves curves, head speed and mixture.

-RCA .......... Making Cuisinarts Fly!!!!!!!

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08-11-2007 05:06 AM  10 years agoPost 9
djsegler

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Dallas, Texas - USA

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I think those are fine - My curve is linear 0, 25, 50, 75, 100. The throttle is managed by the gov, and mixture is just a click or two on the rich side (the gov responds better with a little richer setting)...

Anyway, I can hear the blades make a different sound during that period - Maybe I'll get it lower and see if they are staying in track when that happens...

I can do tic tocs and they are fine... I can flop inverted and snap, punch, etc without any problems. The only time I notice this is when I come in fast and to a gradual flare after having negative pitch thrown in. If I keep it just above 0, I hear this slight change in blade sound and the smoke is being drawn into the blades as if they're still negative. And then after a few seconds, the appear to go positive again, the smoke moves downward again, and the heli stays where it's at. If I try to gradually climb during this period, the collective is a little sluggish until the blades catch again...

Strange...

Practice = Precision... No shortcuts...

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08-11-2007 06:11 AM  10 years agoPost 10
cookie monster

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Los Angeles

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It sounds like a servo is missing a tooth or two... I think ?

Miniature Aircraft fury extreme 90 710 radix Y.S 91

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08-11-2007 12:43 PM  10 years agoPost 11
djsegler

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Dallas, Texas - USA

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It's always done it - even with different servos...

Practice = Precision... No shortcuts...

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08-11-2007 06:24 PM  10 years agoPost 12
rcadd1ct

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Richardson, Texas

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I would check the thrust bearings to see if they are notchy.

Try swapping the blades. They may be stalling on quick transitions.

-RCA .......... Making Cuisinarts Fly!!!!!!!

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08-11-2007 09:58 PM  10 years agoPost 13
bagobitz

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saddleworth,lancs,UK

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flying in your own vortex-ring?...anyone else?

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08-11-2007 11:57 PM  10 years agoPost 14
RCMed-x

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westpalmbeachflorida​usa

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check slop in links or thrust bearings could be pitted from being dry

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08-19-2007 03:11 AM  10 years agoPost 15
djsegler

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Dallas, Texas - USA

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OK - just to close this out - I think I've decided that this is just the result of me flying into my own vortices...

Links are firm - no play in anything. Depending on how I fly and where I settle, this problem appears... As long as I'm moving in a particular direction, there is no problem.

Had some guys watch me today and they agree that it is the result of just flying into my own wash...

Thanks for everyones' tips and support. Seems like I made something out of nothing...

Practice = Precision... No shortcuts...

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08-19-2007 04:10 AM  10 years agoPost 16
jschenck

rrProfessor

La Vista, NE.

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hmm - interesting thought about the vortex. I've noticed that on certain auto's if I'm coming down just right (wrong?) and fast that I have almost no collective authority at the bottom. This is usually a fast drop down on a calm day. There is a very significant delay on getting any lift on the positive pitch but when it comes on the heli will jump up all of a sudden. Another guy noticed this last friday on one particularly slim margin auto.

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08-19-2007 04:15 AM  10 years agoPost 17
djsegler

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Dallas, Texas - USA

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The more wind, the better...

Moves the turbulent air out from under the heli and this phenomenon is much less noticeable.

I'm glad to hear that others have experienced this too!!

Practice = Precision... No shortcuts...

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08-19-2007 04:57 AM  10 years agoPost 18
ChopperEddie

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Pennsylvania, USA!

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I agree about flying into your own vortex theory. As you decend, you are dropping faster than the smoke coming from the exhaust, as you're decent slows and eventually starts to go positive, your blades start grabbing the smoke (air) from around the disk and starts to suck it down. It's something we don't notice when flying electrics since there is no exhaust to show us exactly what the air is doing.

At any rate, the vortex effect with the exhaust smoke sure does look cool.

-- Runway? We don't need no stinking runway! --

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08-19-2007 05:42 AM  10 years agoPost 19
turboomni

rrProfessor

East of the Equator

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flying in your own vortex-ring?...anyone else?
All my heli's do that.

Setup is everything, All my heli's can fly far better than I can pilot them

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08-20-2007 03:46 PM  10 years agoPost 20
cessna151

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Missouri...​Originally Indiana

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flying in your own vortex-ring?...anyone else?
It seems the bigger the heli the less noticable it is. My trex 450 does it all the freakin time and my titan does it too but not nearly as bad.

You can hear the blade noise change as you fly in and out of the vortices.

--Eagles may soar high, but weasels don't get sucked into jet engines!--

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HelicopterThunder TigerRAPTOR 50 › Blade response - is this normal...?
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