Helicopter Testing

WCarneyJX
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Re: Helicopter Testing

Postby WCarneyJX » February 2nd, 2011, 7:08 pm

I've uploaded a low res copy of the plan and will link to it after it's approved.
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WCarneyJX
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Re: Helicopter Testing

Postby WCarneyJX » February 3rd, 2011, 7:44 am

3293|68/SO_Helicopter_Plan_Low_Res.jpg

Not sure why the thumbnail doesn't show up but clicking the "X" icon above brings up he Helicopetr plan.
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chia
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Re: Helicopter Testing

Postby chia » March 6th, 2011, 10:55 am

Baw... I just tried testing my new helicopter, which has both rotors free, and it started going every which way, crashed into a wall, and the top prop hook came off. Thankfully the rotors themselves stayed intact (rotors are so much sturdier than they look!). I'm just not sure why the top hook wasn't strong enough; I glued it the exact same way I've glued them before.
Also, do you find it sort of awkward to launch a helicopter with both rotors free? When one is fixed you just hold onto the motor stick with one hand and the top rotor with the other, but with this kind you need to keep both rotors from spinning...
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WCarneyJX
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Re: Helicopter Testing

Postby WCarneyJX » March 6th, 2011, 11:18 am

Chia,

The big question is the flight pattern. Assuming the rotors are constructed correctly with one clockwise and one counter clockwise, the only other explanation I can think of is massive motor stick bending.

As for launching the Heli with both rotors free it just takes a bit of practice. My kids sort of hold both rotors and then release the top, transfer that hand to the middle of the motor stick, then allow the bottom rotor to spin up a bit and let her fly.

What sort of prop hooks are you using?
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chia
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Re: Helicopter Testing

Postby chia » March 6th, 2011, 11:47 am

I don't think the motor stick was bending that much. I may have just released it at an angle. I think it could have straightened itself out if I had been testing it in an actual gym instead of my cramped foyer...
Using aluminum hooks btw
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WCarneyJX
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Re: Helicopter Testing

Postby WCarneyJX » March 6th, 2011, 11:50 am

Do you mean aluminum tubing with wire hooks? If so, you can wrap the tubing with some thread and glue but you have to consider the weight of doing so. also consider it probably wouldn't have come loose except for the crash...
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chia
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Re: Helicopter Testing

Postby chia » March 6th, 2011, 4:52 pm

Nope, it's a bent aluminum metal hanger (not the best method, but what I have available at the moment). Either way, I reinforced it with thread, like you mentioned (it was underweight anyway).
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jander14indoor
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Re: Helicopter Testing

Postby jander14indoor » March 7th, 2011, 3:52 am

Where's the balance on this new copter? You want the center of gravity to be low to help stabilize it. To high and you'll get wandering like that.

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kjhsscioly
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Re: Helicopter Testing

Postby kjhsscioly » March 15th, 2011, 3:21 pm

I don't have the copter with me, but it should be low, we added clay at the bottom

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Re: Helicopter Testing

Postby thewinner » March 18th, 2011, 6:50 pm

And for stability, the top rotor needs to generate more lift than the lower. Try fiddling with the pitches of the rotors and see what works best.
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