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Century Helicopter . MTA Hobbies . Model Rectifier Corp

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Beginners Corner > Are My Curves Correct ??
 
 
Andre54
New Heliman
Location: South Africa

Hi all
AWESOME FORUM, I love this place
OK i have a Trex 600N DX6i os50 hyper without a gov
My radio was programmed by the dude at my LHS
I have no problem with the heli and she flies lovely
I just wanted you guys to have a look at my curves and give any comments or suggestions

Normal Mode
6% 26.5% 52% 65% 100% - Throttle
8.5% 27% 50.5% 75% 100% - Pitch

Stunt Mode
80% 70% 60% 70% 80% - Throttle
0% 25% 50% 75% 100% - Pitch

In the pitch curve it shows %, how does this relate to degrees
Like at what % am i going into negative degrees.
Thanx for any help
09-18-2008 11:01 AM
 
 
rotormonkey
Senior Heliman
Location: Ottawa, ON - Canada

Looks like a fairly standard setup. As long as you think it flies nice as-is, just leave it as-is. If you find down the road you want to twiddle with it, then do so.

A nice linear pitch curve like what you have is what most folks use for idle up. The trickery is with the throttle curves. You might want to play with them until you get your headspeed nice and consistent through all maneuvers. For example, if you find your head bogs when you give full collective increase your throttle at points 1 and 5. If it's too fast in a hover then decrease at points 2 and 4. If you want to get really technical your throttle might not even match at point 2 and 4 since things are more efficient when you're upside down you may have less throttle (or pitch) at point 2 than at point 4.

There's an infinite amount of screwing around you can do to get the perfect setup.

As for translating a % to actual degrees, the only way to do it is on the bench with a pitch gauge. It depends entirely on your radio and your heli's mechanical setup.
09-18-2008 01:56 PM
 
 
Ozz58
Heliman
Location: Ft. Worth, TX USA

Hard to tell

First, I think your Stunt mode 80% 70% 60% 70% 80% - Throttle might not be high enough. Although I'm flying my Trex-500 electric more than my Shuttle nitro, and without a gov if you go much higher you might over rev. You will need to hear it to see if it's over rev.

Use a pitch gage, as the setup has a lot to do with the radio settings.

Let us know what the pitch is at low, mid and high in both normal and stunt. From there we can help.

Really can't come up with something good
09-18-2008 11:18 PM
 
 
busyflyin
Senior Heliman
Location: Owosso, MI USA

OK.. what the first two guys are saying without saying is, there is no way of knowing if your curves are correct or not. Start with a pitch gage. I will assume you are a complete noob or you probably would be past this question. This is my suggestion, and everyone will have one for you.. but this works;

Start with getting all of your linkages set up properly and use a pitch gage, and make sure everything is square, straight, and linear with the stick at center and pitch & pitch gage at zero degrees. Now, move the stick all the way up and set your pitch at +10 degrees. Move the stick down and set your pitch at -10 degrees. This is a baseline, and your curve should be 50% at center and somewhere around 0-10% at the bottom and 90-100% at the top. If not, fiddle with it until it is. Forget the percentages for now.. Until you are comfortable with hover and easy forward flight, set your pitch up as follows for normal;

-5 at bottom, +5 in the middle, and +10 at the top. Fill in the other positions to make a straight curve. Regardless of what anyone else says, this will give you a smooth hover and you will be able to spend more time concentrating on the cyclic movements.

For the Throttle curve with a hyper, you should be somewhere around 45% in the middle, 100% at the top, and fill in the curve a straight line. If you set the throttle higher, you will probably overspeed during translational approaches. Your head speed should be around 1550 - 1600rpm for learning. Any more than that is unnecessary. Once you are very comfortable with curcuits, then you can thing about changing your curves to match your flying style, but no need to until then. With this set up in the "learning curve", you will be able to do loops, rolls, stall turns, and any other beginner's moves, and you will have a stable hoover.

Hello; Heliproz?... I need to order more parts.
09-19-2008 02:50 AM
 
 
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Heli Wholesaler . 3D Heli Depot . JR-Spektrum

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Beginners Corner > Are My Curves Correct ??
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