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Model Forum / Radio Controlled / Helicopters / December 2003Smallest possible helicopter?
Hi, I was wondering what the smallest possible electric helicopter size would be, I would really like to make a basic 2ch electric one using the electronics from those minature rc cars, u know, the Tomy bit charg or the other 1:43 scale clones. Is this possible?? I doubt it myself, but what do you all think? I woul like to go smaller than the homemade pixel helicopter that someone made. I want to use it indoors u c ! Thanks Scott > Hi, I was wondering what the smallest possible electric helicopter size > would be, > > I want to use it indoors u c ! All cats are animals, but not all animals are cats. I would think the smallest electric helicopter possible would be one of those nano-bot things the Japs can produce. probably a few microns across the rotors. The smallest useable, r/c indoor helicopter though would likely use technology "outside the box". Why not use five or seven large feathers (or shaped Depron) as the rotors, make them fixed pitch, and use two contrarotating heads to eliminate the need for a tail rotor use a small motor driven from a large capacitor as the source. Use the tiny r/c system used for paper planes as seen in RCMW recently for control. Or you could use depron and make a two rotored gyrocopter., driven rotors, no tail needed. I started to make an indoor gyroplane out of pikostik parts and depron blades, but events over took me and it languishes on a shelf now. GL David > Hi, I was wondering what the smallest possible electric helicopter size > would be, [quoted text clipped - 4 lines] > > Is this possible?? Anything's possible, but flying a heli which requires a minimum of FOUR channels with a 2 channel radio isn't likely to be an EASY possibility.  SignatureBeav Please note my E-mail address is "beavis dot original at ntlworld dot com" (with the obvious changes) Beavisland now lives at www.beavisoriginal.co.uk someone here posted this about a month ago http://www.epson.co.jp/e/newsroom/news_2003_11_18_2.htm its pretty small > Hi, I was wondering what the smallest possible electric helicopter size > would be, [quoted text clipped - 13 lines] > > Scott Im thinking that I could use the one channel to go up and down, and the other for a separate rear prop to make the tail go left and right. Obviously, there would be no acrobatics with these many channels, and the mass would have to balanced. I want to build it at under 100g, but finding a small motor capable of this may be a job!! Thanks Scott > someone here posted this about a month ago > [quoted text clipped - 20 lines] > > > > Scott Hey scott, Nice idea, but how are you gonna stop the drift sideways and forward/backwards? People assume that if you just at throttle, the thing will just stay in a line vertically... not so I'm afraid :) I woulda thought the minimum would be 3 channels.. 1 throttle, 2 cyclic.. then you let the 'rudder' drift about and you'll have to be good at flying with the nose facing all directions :-) Now that's a challenge... I think you've set yourself one hell of a goal there, especially if you haven't flown a heli before... but go for it!! It would certainly be impressive if you pull it off. Andy >Im thinking that I could use the one channel to go up and down, and the >other for a separate rear prop to make the tail go left and right. [quoted text clipped - 34 lines] >> > >> > Scott I will try with 2 ch first, even though I don't doubt what u are saying! The rc cars that I have are the minature 1:43 scale ones, the pcb is an integrated on/off NON proportional speed controller, one of these will be stripped out and put on the helicopter, or maybe 2, possibly a 59mhz board and a 27mhz board, giving 4ch depending on interference. And of cause housing 2 transmitters in an housing, doddle, they're small. My primary problem is: Choosing a lightweight motor for the prop, and one for the tail. Then choosing what cells to use, they can't be too heavy! and can't have no power in them either!! Maybe a ni-mh or depending on prices li-poly cell setup. Any ideas on what motors and cells to consider???? will it need any gearing? Ideally as light as possible!!! OR MAYBE I can strip out the electronics of a humblebee clone and make my own body????? the clone which has up down, left, right movement?I would rather make my own tho!!!!!!! more fun. Thanks Scott > Hey scott, > [quoted text clipped - 52 lines] > >> > > >> > Scott If you are bound to use a 2 channel unit, why not pick up one of Radio Shack's Zip Zap SE cars, they are proportional. Also, I'm not sure if a web addy I'd posted earlier made it through. Here they are again for those who are interested. http://www.scarlet.be//pixel/ This tiny 4 channel electric heli weighs in at only 48 grams. -- Linus > I will try with 2 ch first, even though I don't doubt what u are saying! > [quoted text clipped - 83 lines] > > >> > > > >> > Scott > Hey scott, > > Nice idea, but how are you gonna stop the drift sideways and > forward/backwards? By rotating it into the opposite direction, but it's not something that'd be what's called "precise" :-) > People assume that if you just at throttle, the thing will just stay > in a line vertically... not so I'm afraid :) [quoted text clipped - 6 lines] > goal there, especially if you haven't flown a heli before... but go > for it!! It would certainly be impressive if you pull it off. My wife wouldn't think so :-) SignatureBeav Please note my E-mail address is "beavis dot original at ntlworld dot com" (with the obvious changes) Beavisland now lives at www.beavisoriginal.co.uk There is NO way to do it with 2 channels, mate. You can do an airplane with 2 channels, because it is always flying forward and therefore, you can get by with controlling yaw (rudder) and throttle (up/ dn). The third axis, forward/bak is set permanently to forward by the prop. Hovering craft need constant correction in 4 axis and therefore need at least 4 ch. 1 fr/bak 2 left/right 3 up/dn 4 spin (rudder yaw) > Hi, I was wondering what the smallest possible electric helicopter size > would be, [quoted text clipped - 13 lines] > > Scott looks like i may have to try the 4ch approach then. That bloke who made the pixel heli is inspiring! 48g is the weight of the pixel 2000!!! Thanks Scott > There is NO way to do it with 2 channels, mate. You can do an airplane with > 2 channels, because it is always flying forward and therefore, you can get [quoted text clipped - 26 lines] > > > > Scott > looks like i may have to try the 4ch approach then. > [quoted text clipped - 38 lines] > > > > > > Scott Check this out: http://www.proxflyer.com/ Smallest there is i think :-) Only 6,9 grams. GENIUS! :) >> looks like i may have to try the 4ch approach then. >> [quoted text clipped - 46 lines] >Smallest there is i think :-) >Only 6,9 grams. I am not sure if this is still an active research project a stanford..but if they ever finish it will be small!! http://aero.stanford.edu/mesicopter - dnaffi ---------------------------------------------------------------------------------- Posted from the RCGroups.com Discussion Forums Visit us at http://www.rcgroups.com <------- Win free R/C Gear View this thread at rcgroups.com: http://www.rcgroups.com/forums/showthread.php?threadid=17737 It is possible to fly a helicopter with two channels!!! Just not in the traditional way on proxflyer.com/ the bloke on this site has produced a mini heli that doesnt use the 3rd channel, have a look: http://www.proxflyer.com/mi_description.htm control: 3 (uses 2) channels FM Radio with ESC from MPS One motor drives both rotors with one rubber band twisted. Vertical tail rotor for yaw control > I am not sure if this is still an active research project at > stanford..but if they ever finish it will be small!! [quoted text clipped - 7 lines] > Visit us at http://www.rcgroups.com <------- Win free R/C Gear! > View this thread at rcgroups.com: http://www.rcgroups.com/forums/showthread.php?threadid=177372 |
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