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Balsa trainer rolling left on take off ?

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Old 09-24-2012, 02:31 AM
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reelquick
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Default Balsa trainer rolling left on take off ?

Argggggg,

have 40 size balsa trainer 3.5 pounds with an E flight 25 brush less,10 x6 wood prop, 40 Jetti ESC .
I decided to go with a 4000 Mah 11.1 V battery and a 4 cell nicad rx battery.
Checked CG, put wing on and took here for a test.

Taxied fine, ran straight, pleantey of power.
Tried to take off and once again........plowed into the ground to the left.
2 planes 2 days what Am I missing ?
Thank You.
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Old 09-24-2012, 03:40 PM
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Default RE: Balsa trainer rolling left on take off ?

I did some research and came up with ground loop. Too much throttle at take off ?
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Old 09-24-2012, 04:08 PM
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Default RE: Balsa trainer rolling left on take off ?

To much elevator at take off and not enough speed. Shallower climb out and more speed. Also check wings for warps.


Buzz.
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Old 09-24-2012, 04:21 PM
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Default RE: Balsa trainer rolling left on take off ?

Will do , need a larger field,
Also I read about the wheels being 2 loose ,need to bring the collars in as well ? They were a little floppy.
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Old 09-26-2012, 08:07 AM
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Default RE: Balsa trainer rolling left on take off ?

Have you checked the lateral balance?
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Old 09-26-2012, 11:21 AM
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Default RE: Balsa trainer rolling left on take off ?

Not yet, can you elaborate ?
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Old 09-26-2012, 12:38 PM
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Default RE: Balsa trainer rolling left on take off ?

Sure,

I like to have a helper but you can get the idea by yourself.
Use one finger to hold the motor shaft or spinner and then use the other hand
and put a finger under the rudder or very close to the end of the fuse.
Then lift it up and see if it will tip one side or the other.
You of course want it to stay put just perfectly balanced.
You may be able to balance it by just moving your battery.
Sometimes I have to add weight to a wingtip or close to it.
I hope this makes sense.
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Old 09-26-2012, 01:08 PM
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Default RE: Balsa trainer rolling left on take off ?

Thank You Sub, just checked it out , along with the CG.
Lat is OK,
but my CG shifted to tail heavy due to Battery location.
Ready to give it a go. And of corse it just started to rain here in the north east.[]
I still wanna see if I can slow her down a bit, not used to the high speed at Take off.
But thats in another thread I started.
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Old 09-26-2012, 01:22 PM
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Default RE: Balsa trainer rolling left on take off ?

I was trying to understand your other thread.
you said "this thing moves" as in it goes fast?
and then you said your running out of runway
and you want to get it off the ground sooner.
This dosnt add up because if its going fast it should
lift off.
Also i'm wondering about when you said you have a
.25 motor for a .40 plane. is that right?
If thats the case you may have to worry about your
speed controller when going for bigger props or pitches.
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Old 09-26-2012, 04:36 PM
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Default RE: Balsa trainer rolling left on take off ?

I just ran the numbers you posted, Eflite .25, 40amp ESC and a 4000mah 3s battery. That works out to be about 42 ounces of thrust. your planes weighs in at 56 ounces. It is going to take a long runway to get up to speed. If you get a APC 12X6 electric prop, you should have around 63 ounces of thrust. Or you can go with a 4s battery and a 10X6 prop and it will be around 70 ounces of thrust.

Sounds like you just need more get up and go.

Buzz.
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Old 09-27-2012, 02:32 AM
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Default RE: Balsa trainer rolling left on take off ?

Could you explain APC please.
12 x 6 might be cutting the grass.
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Old 09-27-2012, 04:13 PM
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Default RE: Balsa trainer rolling left on take off ?

Got the APC props, will give them a go .
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Old 09-29-2012, 05:39 AM
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Default RE: Balsa trainer rolling left on take off ?

HOLLY COW ! I put on a 12x6 APC and this thing jumped off the ground. It was dark out side so I just tried it on the street.
I have one inch of clearance from the ground, not good on the grass, Gonna try a 11.5 x5 and see what that does.
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Old 10-02-2012, 06:18 PM
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Default RE: Balsa trainer rolling left on take off ?

Did you get to fly it yet? Did the electric props help?


Buzz.
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Old 10-06-2012, 06:17 PM
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Default RE: Balsa trainer rolling left on take off ?

Yes it did help but I had to set her down due to the darkness. It has been raining here for the last week and my field is nothing but mud.
I have a second model and gonna retool with the help of Hobby King.
Just appreciate the help from every one.
Going from glo to Electric is a little bit tricky.


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Old 01-01-2013, 10:25 AM
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Default RE: Balsa trainer rolling left on take off ?

The minimum prop listed for that motor is an 11X8, so an 11x10 may work although it will be pretty quick at that pitch. But, that's what the throttle stick is for.  

A left bank is to be expected at slow speed, that's the airplane demonstrating it's at the edge of control and the motor torque is greater than the flight controls. Try a bigger nosewheel tire for better prop clearance. It will also give the wing a better angle of attack, helping the plane to fly off instead of jumping off with elevator. 
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Old 01-02-2013, 02:29 PM
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Default RE: Balsa trainer rolling left on take off ?

Why didnt I think of that ??
I did put bigger wheels on it,
Maybe I thought it was taboo to have not all the wheels matching.
Thanks!
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