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Helicopter Differences Question - 7/2/2012 1:01 PM   
thailazer



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From: Ampur Mae TaengChiang Mai, THAILAND
Status: offline 		I was given an inexpensive ESKY electric helicopter and over the past week I practiced hovering it close to the floor until I learned the responses and I just had my first outdoor flights with climbs, descents, and turns in both directions. Loads of fun and it sure is a lot different than flying fixed wing RC aircraft that I have done a lot of. This chopper seems to need a lot of forward stick to keep it from backing up so there is a trim issue for me to figure out, but it is still quite flyable and fun.

This helicopter is the dual-rotor type and I am wondering how different the control responses of single rotor choppers are. Are they a lot more difficult to set up? Are they more difficult to fly? I am wondering if after a few weeks of this small ESKY unit, if I would be ready for a more advanced beginner machine. All comments appreciated.

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RE: Helicopter Differences Question - 7/2/2012 8:58 PM   
RMB677


 

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From: Watkinsville, GA, USA
Status: offline 		I have an E-Sky E500 that did have a tendency to favor going in reverse.  My finding was that the heli is tail heavy and needed some weight added to make it slightly nose heavy.  Also mine does not do well with even a little breeze.

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RE: Helicopter Differences Question - 7/3/2012 12:28 AM   
thailazer



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From: Ampur Mae TaengChiang Mai, THAILAND
Status: offline 		Thanks, I'll try adding a little weight to the nose. And you are right about it not handling any wind. It was dead calm yesterday and not a breath of wind so had a good flight.

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RE: Helicopter Differences Question - 7/4/2012 2:38 PM   
thailazer



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From: Ampur Mae TaengChiang Mai, THAILAND
Status: offline 		A decade ago, a friend told me that learning to fly helicopters is simply the act of replacing parts that you break. I think I found that out tonight. As usual, the winds died down to nothing in late afternoon so I brought the ESKY Hunter outside for some real flying as I have the past few nights. With the fresh battery, I climbed up to 40 feet and started a diving turn. Suddenly there was a clatter of blades and the hunter came down like a shot duck with wings folded back. I never did find the flybar, and the lower blades were broken off at the tips. No other damage and I was up and flying in 5 minutes.

So what happened? Did I exceed the allowable control throws? Did the fly bar depart the aircraft? Let me know your thoughts here.

Also.... Still looking for an answer to my original post: Do single rotor helicopters fly the same as these inexpensive coaxials, or am I fooling myself?

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RE: Helicopter Differences Question - 7/5/2012 3:36 PM   
Rafael23cc



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From: Junction City, KS, USA
Status: offline 		Since you say that you have some experience with plank... (AHEM) Planes I will use some airplane terminology to explain flight physics of helicopters. Let me know if you did not understand.


quote:

ORIGINAL: thailazer

....So what happened? Did I exceed the allowable control throws? Did the fly bar depart the aircraft? Let me know your thoughts here.


You exceeded the maximum forward velocity of the design. As the helicopter moves forward thru the air, one side of the rotor disk has to raise to compensate for the extra lift created by the additional "wind speed". Think of it as a rudder only turn on an airplane. If you crank the rudder on an airplane, one wing goes up and the other goes down. Since you have two rotors spinning in different directions, the high side of one rotor, met the low side of the other rotor. A basic flaw of flapping head coaxial design.

quote:

Also.... Still looking for an answer to my original post: Do single rotor helicopters fly the same as these inexpensive coaxials, or am I fooling myself?


You can see it as dihedral on an airplane. A coaxial is like having a lot of dihedral. Coaxials tend to be very stable and "self-level" in some situations. A fixed pitch single rotor is like having less dihedral. Some are stable and some are neutrally stable, meaning that once placed on a certain attitude they will stay there until something happens. And finally, a collective pitch single rotor is like having zero dihedral or sometimes anhedral, depending on the model.

Rafael


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RE: Helicopter Differences Question - 7/5/2012 11:52 PM   
thailazer



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From: Ampur Mae TaengChiang Mai, THAILAND
Status: offline 		Rafael.... Thank You for those excellent explanations. Exceeding the maximum speed makes sense, as the tips of the blades were broken off, exactly what what would happen in the scenario you describe. Appreciate the newbie help.

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RE: Helicopter Differences Question - 7/10/2012 1:54 PM   
thailazer



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From: Ampur Mae TaengChiang Mai, THAILAND
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quote:

ORIGINAL: RMB677

I have an E-Sky E500 that did have a tendency to favor going in reverse.  My finding was that the heli is tail heavy and needed some weight added to make it slightly nose heavy.  Also mine does not do well with even a little breeze.

Boy are you right on with the breeze comment. Even the slightest whisper of wind and it takes full stick deflection. I usually launch with zero wind and then a puff comes along and away it goes. Way more sensitive than the lightest wing loaded plank. Am getting the hang of it however.

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