RCU Forums - View Single Post - LMH is out of control
View Single Post
Old 01-23-2003 | 06:38 PM
  #34  
Johng
My Feedback: (4)
 
Joined: Jan 2002
Posts: 1,928
Likes: 0
Received 0 Likes on 0 Posts
From: Deland, FL
Default LMH is out of control

Trying to take off and go directly to forward flilght doesn't make much sense. You'll never learn to hover that way. If all you want to do is forward flight, sell it and get an ugly stick.

Straight advice from someone who learned heli on LMH and hasn't ever flown another heli:

1) Read the F'n flight manual and understand what it says. Do what it says. One of the better manuals for how to get started I've ever seen.

2) Use the training gear - dowels & ping-pong balls. (per the manual)

3) Use blade grips for 5-pitch ( a 4 and a 6) then retrack the blades. (per the manual)

4) Add an ounce or two of weight (is that in the manual?) Screw regular stick-on weights to the crutch as close to the main shaft as you can. Makes the rotor turn faster and the heli has the mass to resist gusts better. I find the heli is less tippy in response to gusts if the wieght is mounted as high as possible.

5) Set the controls for movement just like the manual - then set dual rates for pitch and roll to 50% and start flying on these low rates. I use some expo too.

6) Fly when it's dead calm out to begin with.

7) Fly from a surface that lets the heli slide.

8) If it seems unstable in pitch and/or roll use lower travel or add grub screws to the tips of the short blades (per the manual). If the heli is unstable in yaw, check the tail rotor mount. The little set screw needs to point straight down for the Arlton gyro to work right. If it point straight up, the gyro will actually destabilize the tail rotor and it won't be controlable.

Now here's the trick to starting out well:

Start it and set it down where it can slide. Slowly power it up without getting to flying speed. It will start to slide or lean one way or the other, or it will turn one way or the other. All this without leaving the ground. When this happens, throttle down and add trim to counteract whatever is happening. Be patient, and keep doing this until it starts lifting off without leaning or sliding. It will turn a slight bit, but if it wants to keep turning, it will need opposite trim. Be patient and keep tuning. I have had the LMH tuned for 3-5 sec of hands off flight in still air before.

If that's all too much tinkering, sell the heli. All heli's need to be tinkered with to fly well.

BTW - I use a little piezo gyro on mine. Hobby Shack sells a nice little one for less than $50 that does the job.