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HelicopterMain Discussion › Tail pitch Question?
01-02-2013 07:25 PM  5 years agoPost 1
icanfly

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ontario

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How much tail pitch is a good preset for a typical heli with 2 blades on the main and tail, in degrees?

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01-02-2013 08:35 PM  5 years agoPost 2
tail chaser

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sparta, mich. usa

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Good question I'd like to know also

Paul Monroe

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01-02-2013 08:47 PM  5 years agoPost 3
meowguy

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Saco, ME

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I usually start at 15 degrees to the right. That is the trailing edge of the blades goes to the right, air blows right, tail goes left, nose goes right. The servo arm is then set so it is a perfect right angle to the pushrod at center stick. The push rod at the pitch change should also be at right angles. The gyro must be in rate mode when you set this up.. Don't forget to return to hh mode when done. You make the adjustment by sliding the t/r servo brackets to position.

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01-02-2013 11:16 PM  5 years agoPost 4
salrica

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Raleigh,NC

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I have the gy520 and spartan quark
The gy520 with some pitch on the blades
The quark with no pitch at all
Then it's been said that with the 450pro you have to do some mod on the tail blade grips.
I would say depends on your gyro?
What about with the flybarless helis?
Until you see that the tail/gyro holds that's when you stop trimming it.

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01-03-2013 02:22 AM  5 years agoPost 5
icanfly

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ontario

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simple question, in degrees. Heli's set up so tail servo runs the full pitch. Only asking what degrees a heli blades should be at when the heli is holding the tail.

I know the answer depends on What blades of tail and main, design, efficiency, size, and all that are being used.

In degrees, after a heli is spooled up what typical degree are the tail fins at? An average. I measured my 450 and it was at 5 degrees, main blades are 325mm 3d fb.

I suppose what I'm asking has something to do with fb/fbl tail settings. For example if the tail slider links were slightly longer to "preset" the tail fins at center, heli spooled up, then the full range of tail authority would come into consideration.

A fb system is drag, how much on the tail.

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01-03-2013 02:42 AM  5 years agoPost 6
Santiago P

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South West, Ohio

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not in degrees...
Sorry, demanding in answer in degrees is not a good question.

The basic rule for tail setup is to put the tail pitch slider in the middle of the tail shaft available travel space.
This most of the time coincides with having the tail control pushrod close to 90 degrees with the tail bellcrank.

So you see, the answer in degrees is: IT VARIES FROM MODEL TO MODEL.
Depending on tail ratio and tail DIA, the angle can be anywhere between 12 and 20 degrees.

But the initial setup is the same, tail pitch slider @ midpoint. Then trim.

Santiago

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01-03-2013 03:52 AM  5 years agoPost 7
Dr.Ben

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Richmond, VA, USA

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Static set up will vary a lot with model design. Static setting on better designed models will center the slider at something which remotely approximates required pitch at typical flying rpm. Others will center the slider with zero degrees of tail rotor pitch, thus necessitating a large amount of pushrod adjustment to achieve trim.

You just cannot hang a set number on the required amount of tail pitch. A model with 95mm tail blades flying at 1850 rpm will be much different from one set up with 115mm tails running 2K on the head. That does not even begin to touch what different tail ratio can do, either.

Ben Minor

Team Futaba Team Kontronik USA

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01-03-2013 04:13 AM  5 years agoPost 8
Wave

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Illinois

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Bottom line...set it to 10 degrees and go from there.

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01-03-2013 01:02 PM  5 years agoPost 9
icanfly

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ontario

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My own tail pitch slider/bearing is kaput and was replaced last night. Source of a dreaded tail wobble.

I know that blades, rpm, head assembly (fb/fbl) will determine how much tail authority is needed to hh, It's interesting to see what force is required to keep the airframe pointed in one direction, sometimes very little.

Ideally the tail slider throw to left and right should be equal after the heli is in hh.

The answer was as easy as going to your spooled up heli, turning it down to stop, unplugging the batt or shutting off the engine, and measuring how much tail pitch the blades rested at.

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01-03-2013 03:11 PM  5 years agoPost 10
MikeyD_From_Indy

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Carmel, In

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Why not put your set up in rate mode, fly it and manually adjust your linkage until it does not drift and then take your measurement. Wouldn't that be specific to your heli and give you your looking for?

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01-03-2013 04:30 PM  5 years agoPost 11
jgunpilot

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Pollock, LA

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Another school of thought is that if something happens with the tail you're just going to hit throttle hold and auto anyway, so skip the whole "rate mode" step and set it up with everything square and tail slider in the middle. It'll fly just fine.

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01-03-2013 04:39 PM  5 years agoPost 12
icanfly

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ontario

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oh it's flying no problems except that I was trolling for an answer to only tell what pitch your tail blades hh in after spooling down, doesn't matter the size or make, only looking for an average in degrees.

Thanks for the helpful replies.

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01-03-2013 05:43 PM  5 years agoPost 13
tail chaser

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sparta, mich. usa

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I fasten my 450 trex sport on a carousal (took my wife's off the kitchen
table) and set the rudder stuff up.

Paul Monroe

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01-03-2013 06:57 PM  5 years agoPost 14
icanfly

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ontario

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This is my thing the past few days while testing out in the snow.

Cause, an electronic cut out of the motor control.

Not wanting to let the thing veer me off course, it has with the typical bump and grind boom , blade, head, tail repairs, my 450 has been acting up electronically enough that it's away from a secure flight after the fact.

On one had there's great experiences and dreams of trouble free flight, however inevitable contact with solid objects, because of confined space and windiness, may or may not be the cause of this latest thing.

The answer to the question was to ask you to degree out the tail fins after hh, don't touch them, just set them on the pitch guide tool.

Any takers

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01-03-2013 08:52 PM  5 years agoPost 15
icanfly

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ontario

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electrical glitch solved by accident really, cost, a pair of blades.

Just had AL 450 out in the snow, man the thing was amazing, no glitches AT ALL, you'll see it one day. What's neat is flying side in and go forward hover, then reverse and hover at a distance going from nose out to nose in, and turn your body to face the heli. Both sides like a pendulum on a rail. sounds like baby steps right, naw, only putting things together. Did 3d on a sim yesterday.

So how 'bout you see what measured up on those tail fins,

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