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Mikado Modellhubschrauber . GrandRC . CanoMod

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e-Lite Machines Corona > Trimming advice ?
 
 
copterklutz
Senior Heliman
Location: Western Massachusetts

I've got a new Corona 120M that I've been trying to fly for a few weeks. I've had a couple of minor "crashes" with blade strikes and bumping into things trying to hover it. My problem (besides having only a couple of months experience Sim and actual) is that the heli isn't as stable as I'd like. It's kinda jumpy. I've set all the linkages per the instruction booklet, any tips on dialing it in ??

I'm running Fusion 7 motor with Castle 35 ESC and HS81 servos with a GY240 gyro and 3800MA NiMH battery with Hitec Laser TX and Micro 555 Receiver.

Thanks in advance for any tips...






" Well, Um.... it's fixable......"
03-06-2006 Over year old.
 
 
ilewis33
Heliman
Location: Norcross, GA

What do you mean by "jumpy"? Here are some things I can think of, but it all depends on exactly what undesired motion you're seeing:

- Tail wagging back and forth - gyro gain set too high - back off on gain.
- Tail doesn't stay in one place - gyro not on Heading Hold - set gyro to AVCS mode
- Heli sways back and forth ("pendulum" - overcorrection or hovering too low to ground - increase altitude or develop lighter touch
- Vibration - blades out of balance or tracking - track blades or balance them, also check rotor hub tightness.
- Rapid gain/loss of altitude - rotor head binding - check linkages, ensure they are the same length.
03-06-2006 Over year old.
 
 
copterklutz
Senior Heliman
Location: Western Massachusetts

Quote 
Heli sways back and forth ("pendulum" - overcorrection or hovering too low to ground - increase altitude or develop lighter touch


This is probably 99.999% of the problem.....

Thanks for the reply...






" Well, Um.... it's fixable......"
03-06-2006 Over year old.
 
 
ilewis33
Heliman
Location: Norcross, GA

One thing that I found helpful was to reduce the spring-centering force in my transmitter. (You take the back off and adjust some screws). I reduced the spring force to the minimum on both sticks, and took off the "ratchet" on the throttle. This let me have a much lighter touch on the cyclic, since there is now very little force to overcome when correcting. Removing the throttle ratchet let me put the throttle at exactly the right value for hovering - with the ratchet, I was always going back and forth between two clicks.

Other random tips -
- Focus on the rotor shaft or the top of the rotor head when hovering. This is the first piece of the heli to move. When you focus on the heli body, you are always behind in your corrections, because the body is always catching up to the rotor head.
- Avoid wind, no matter how tempting it is to fly. 99% of my initial crashes were due to wind.
- When making corrections, if the transmitter is trimmed ok, and there is no wind, most of your corrections should be:

centerstick -> correct -> return to center immediately.

On my first heli, I would see it drifting left, so I'd hold the stick right, and the heli would go right, and keep going since I was still holding the right, then I'd slam it left, etc., etc.

Anyway, I'm no expert, but since I just figured it out for myself recently, these are what seemed to help me the most.
03-06-2006 Over year old.
 
 
nrthwing
Heliman
Location: Hebron KY (just south of Cincy)

Home Position

My 2 cents.
I started out with a Corona and loved it so much I bought a second one.

To my point. You should always develope a home position so when things go wrong you can return to that "home" position first then correct the misdirection.

Hope this helps.

Mike
03-10-2006 Over year old.
 
 
copterklutz
Senior Heliman
Location: Western Massachusetts

Thanks for the tips....

I upgraded to the CHOPPER-1 aluminum sub rotor after a minor crash and took some slop out of the swashplate and that seems to have steadied the heli more. Now I'm just trying to get rid of some tail wag which is probably the Gyro needing to be setup correctly again. I set the neutral position on the T/R servo and then setup the Gyro with AVCS again with 75% gain. I'll try that and see if it settles down.






" Well, Um.... it's fixable......"
03-10-2006 Over year old.
 
 
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Futaba-RC . A Main Hobbies . Boca Bearings

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e-Lite Machines Corona > Trimming advice ?
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