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Old 12-25-2010, 11:24 AM   #1
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RC Helicopter problem


Got a Execuheli RC copter from Future SHop. First time it crashed. Seems like one of the stabilizer rods came off so I replaced it...now it just rotates counter clockwise and won't lift off the ground. Any Ideas??

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Old 12-25-2010, 11:58 AM   #2
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RC Helicopter problem


Is it this one? The first crash probably screwed up more than the stabilizer....

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Old 12-25-2010, 12:09 PM   #3
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RC Helicopter problem


Yep, DM...that's the one. The bottom rotor just doesn't move fast enough anymore
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Old 12-25-2010, 12:39 PM   #4
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RC Helicopter problem


You may need to operate, Dr. Club. lol

It sounds like a broken gear cam to me....

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Old 12-25-2010, 12:48 PM   #5
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RC Helicopter problem


I thought that as well but the bottom rotor turns freely. I think it gets its spin from the top rotor. Is the bottom rotor supposed to turn free?
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Old 12-25-2010, 12:52 PM   #6
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RC Helicopter problem


I don't think so, I believe it's geared in there. Po)

Open 'er up!

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Old 12-25-2010, 12:55 PM   #7
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RC Helicopter problem


GULP!! Ok, here goes. It's not really mine...its a buddies but I'll see if he's willing lol
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Old 12-25-2010, 01:02 PM   #8
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RC Helicopter problem


Uhoh... did YOU crash it or did he??? lol

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Old 12-25-2010, 01:04 PM   #9
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RC Helicopter problem


not from experience with this particular device but from general principles of the mechanics of a helicopter:


both rotors must be powered. That is what keeps it from spinning uncontrollably. If only one rotor is powered and the other allowed to free spin, the chopper body will spin the opposite direction of the spin of the powered rotor; you know, Newton's 3rd law of motion: (paraphrased) for each action, there is an equal and opposite reaction. The motor attempting to spin the one rotor imparts an equal and opposite force on the body of the chopper. This will result in both the single rotor and the body spinning in opposite directions.

Then, on top of that, the friction between the rotor and the air will cause resistance, which will also impart the opposing force onto the body, causing it to spin.

Both those forces are countered by the tail rotor of a typical helicopter. From what I can tell, your chopper does not have an active tail rotor so they toss in the second main rotor to provide a force to counter the forces already described by rotating it in the opposite direction.

So, if both rotors are not actively powered, it just isn't going to fly right, if at all.
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Old 12-25-2010, 01:20 PM   #10
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RC Helicopter problem


I suppose that makes sense, but there only seems to be one shaft, about a 16th of an inch thick which both rotors sit on. I can't see how they could fit a reversed gear in that small of a space...also if it were, how can they sell them for $30? Anyway, my buddy is just going to take it back tomorrow. Fortunately, DM, it was not me who crashed it but I am going with him tomorrow to get one for myself! Looks like FUN!
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Old 12-25-2010, 01:31 PM   #11
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RC Helicopter problem


the drive gear for the lower rotor is probably below the body shroud and then the upper rotor is on it's own shaft with the drive gear for that likely being even lower in the body.
and those Chinese elves work for candy canes so price can be kept low.
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Old 12-25-2010, 02:15 PM   #12
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RC Helicopter problem


I believe the top is a solid shaft, the bottom a geared tube, both are powered, the teeth or gear for the bottom one broke.
Good that YOU didn't break it!

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Old 12-25-2010, 02:18 PM   #13
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RC Helicopter problem


I'll say! It really didn't fall from a great height though...maybe 2.5 feet onto the coffee table. Are they that delicate?
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Old 12-25-2010, 03:08 PM   #14
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You tell US! LOL

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Old 12-26-2010, 11:36 AM   #15
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RC Helicopter problem


Ok guys...you were right! Took it apart and found the problem. To the right of the two white gears is a smaller gear which turns the lower rotor. It had gone up too high so I just pushed it back down again. Works like a charm Here's a pic...
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