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ABC turns left.

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Old 09-19-2005, 10:23 PM
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camlf
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Default ABC turns left.

wing is ballanced. tail is repaired with cross dowel. boom is moded and tight. tail is squared and level. Boom may of been crooked comeing out of fuse. gave it a twist to its right and was flyable. But had to use full right trim. Got home and rechecked . Measure prop ends to wing. seems pretty stright. done the mod. Turns left hard at hand launch.
Checked servos. pointing at each other. Did correct methed of trimming with power on. Checked boom with stright edge. What am I missing.
Controll horns not damaged and same pull on both.

did get it to fly as I said after giving the boom at fuse a twist to the right and full right trim on the TX. As soon as I try to return the full right trim the plane goes left. humm... Thanx for your help.
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Old 09-21-2005, 12:38 PM
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Default RE: ABC turns left.

I have had the exact same problem. My guess is at some point its popped out of the lousy harness they use to keep it in place. If you haven't already, use some duct tape and wrap it around the boom and fuse (small thin strip). The boom can and will come loose in flight. At hand launch sounds odd ...

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Old 09-22-2005, 08:00 AM
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Matt Kirsch
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Default RE: ABC turns left.

When you determine that everything is straight and secure, but it still goes left, just go ahead and adjust the tail flaps to give the plane a little bit of a right turn. Use the little screwdriver adjusters on each control horn. Give the left flap a little up, just a little, and let the right flap down, just a little.
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Old 09-22-2005, 06:07 PM
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camlf
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Default RE: ABC turns left.

Thanx.. I have "favored" the left flap a little up. Test flight friday. Tail must be slightly off somewhere.
I have a new tail but not ready to give up on the old one yet.
Thanx.
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Old 09-26-2005, 04:15 PM
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Default RE: ABC turns left.

I had the same proplem with mine. turned out to be the circut board was loose. I guess from the crashes. I epoxied it back in place and havent had the problem since. I hope this helps.
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Old 10-14-2005, 10:52 PM
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aeajr
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Default RE: ABC turns left.

I have an Aerobird and an Aerobird Challenger. Combined I have over 400
flights on them. I have taught several people to fly their Aerobirds. Here is
the procedure I tell people to follow to get the plane to fly properly. I
can't be sure how much damage you have done to the plane due to crashes, so
let me just offer this as a starter.

Unless you have removed the white foam that sits between the battery and the
electronics, ignore CG for the moment. Do all of your flight testing with the
6 cell battery. The 7 cell makes it nose heavy and will change the way it
flies. When we are trying to fix it, I would use the 6 cell only.

1) With your transmitter on and all trims centered, and your battery connected
in the plane, but with the motor off, look at the control surfaces on the tail
from the back. Are the movable parts exactly even with the fixed parts? If
not then you are going into a turn the moment you launch assuming the motor is
straight and the tail is straight. More on that later. Normally, these
surfaces have to be
perfectly aligned.

2) The boom between the pod an the tail - is it solidly anchored or can you
move it around inside the plane. If it moves, it has broken loose. This must
be
fixed. It will either sag causing the nose to go down or it is twisted causing
the plane to turn right or left.

3) Check the tail, especially by the rigid plastic near the boom. Are there
any creases? I had a problem with my Aerobird that caused it to turn to the
right so badly that it crashed because it would go into a spiral. I tried
everything. Turned out there was a crease in the tail that caused the tail to
flex under pressure. On launch, this could take you into the ground.

4) It is possible for the tail to shift from a severe nose crash. There are
trim instructions in the owner's manual. AFTER you have checked the other
items and
fixed or found them to be OK, try trimming the tail for more up or down force.


Other points to be aware of:

When the motor is running, more air moves across the tail so that you get a
faster response for turns. The slower the motor is running, the slower the
plane will respond. When gliding, response can be very soft.

Make sure you are launching into the wind - directly into the wind, or the
plane will be turned by the wind when you launch. Same for landing.

Let me know how it goes.

If this doesn't help, I invite you to post photos.

These are what I would
want to see: All shots are with battery in and transmitter on, motor off.
All trims to center and not touching the stick unless I tell you to. All
tests are in Sport mode.

view from nose to tail - level with the top of the plane - to check alignments
view from tail to nose - same reason

Remove the wing, lay the plane on a table on its side with the tail hanging
off the end. Place a ruler or a suitable straight edge under the body
extending to the tail. I want to see if the boom
is straight

surface alignment - battery connected, transmitter on - make sure your trims
are centered

For the shots from tail, I want you to center the motor in the frame so that
you are shooting STRAIGHT down the shaft.

view from the tail at tail height - full left command
view from the tail at tail height - full right
same - full up
same - full down
sticks centered and hands off shot.
Finally view from under the tail.
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