I bought a 2ch rc helicopter a while ago because it looked cool but I was dissapointed with it when I realised how little control it had. Now I am about to buy a 4ch rc helicopter, my friend has bought one and I have seen him fly it with great controll. The one I am looking at to buy has a single set of main rotor blades but there are others with 2 sets, one above the other. does anyone know the advantages/disadvantages of having a double set of main rotor blades over having a single set of main rotor blades?
ok, here’s the stuff that i know.
Usually when you have one main rotor blade you have a tail rotor to counter its centrifugal force. When you have two main rotors that spin in opposite directions it eliminates the need for a tail rotor because they counter each other. I’m not sure which gives you greater control, but i have a sneaking feeling its the one with two main rotors.
The ones with 2 sets of main rotor blades still seem to have tail rotors, maybe to just add controll. I think I will just go for the one with a single set of main blades as they look nicer although it would be interesting to find out the reason.
with double main blade(counter rotating) a helicopter is extremely stable, but there is a HUGE penalty in speed( they go like 1-2 mph)
with a single main blade copter you have more speed and manueverability, but they are not as stable as a double main rotored one
i personaly would go for a single main blade copter. it will do you more good in the long run. if you want a heli, get a blade cp, they’re nice and stable on low rates, but they can be 3d copters w/ a bigger motor. so my preference is the single main blade copters, but if you only want to fly it w/o doin tricks, get a coxial( double main blade) heli.
i hope this helps
-Spencer
a long time ago when i was thinking about getting one, there were only single rotor versions. in a single rotor version, when the main rotor changes speed, the tail rotor has to change speed too, to compensate. this makes it more challenging to fly. good controllers can be programmed to automatically adjust the tail rotor speed, but you will always need to make some manual adjustments.
you over- or under-power the tail rotor to get the helicopter to yaw (rotate on the vertical axis). this is why the twin rotor versions still have a tail rotor.
i’d get a single rotor just because i think it would be more of a challenge. since you are on a unicycle forum, i’m going to assume you like challenges too 
i never got around to getting one. now i live in a bigger city, and i wouldn’t have so much space to practice.
pix.
Thanks for all your advise, one thing, what does cp mean/stand for?
with 6ch other than being able to change the pitch of the main rotor what is different?
cp=colective pitch
Could you exspand on that please :o
it means you can change the pitch of the main rotor blades
I’ve got a Piccollo, a single blade helicoptor and quite robust, and now that I’m using a 910mah 2 cell LI-PO battery I get about 20 minutes flying time. Contra Rotating blades are certainly easier to fly though and better for smaller places but the battery run time is usually less. Flying and unicycling at the same time. now there’s a challenge.