+ Reply to Thread
Page 1 of 25 1234511 ... LastLast
Results 1 to 20 of 490

Thread: Quad/Hexa-Copter using Propeller, Gyros, Accelerometers, Compass, Pressure & GP

  1. #1
    Cluso99's Avatar
    Location
    Sydney/Brisbane Australia or 'sailing on the high seas'
    Posts
    10,219

    Default Quad/Hexa-Copter using Propeller, Gyros, Accelerometers, Compass, Pressure & GP

    AIM: To build a QuadCopter or HexaCopter using Propeller(s)·to assist·Remote Controlled Flight for beginners.

    Latest Specifications for the Electronics·PCB (25Apr2010)Latest Specifications for the·Quad/HexaCopter (25Apr2010)
    • Frame
      • Suggested to use 10.5x10.5mm carbon fibre frame (to be tested)
      • Suggested center support by two pcbs
    • Brushless outrunner motors (see thread)
    • Propellor blades (see thread)
    • ESC's (see thread)
    • LiPo Battery (see thread)
    • Charger (see thread)
    • Battery monitor (see thread)
    • Other optional items
      • Motor mounts
      • Prop savers
      • Wiring
      • Servo cables (from RC receiver to electronics pcb)
    • Radio Control Gear (user to decide)
      • I have a Spektrum DX6i

    Original Post

    I have been getting ready for my next project... Well one that has been on the backburner since I got involved with Z80 emulation. And no, I am not giving·that up either

    I was in the process of building a Flying Wing when I found the Propeller Chip. Since then, I have become quite interested in Quad and Hex Copters after I saw Jason Dory's thread http://forums.parallax.com/showthread.php?p=757602

    I have been looking at various ICs to interface to the prop to control the flight to make it easier for me to fly these things. I never did master the RC Airplane I used to launch... You see, I never made a successful landing, but I sure mastered the art of building and repair

    The chips that seem to do what I want are...
    • Gyro Pitch & Roll LPR530AL $8.90
    • Gyro Yaw········· LY530AL· $8.90
    • ADC micro (Atmega328/PIC18F2xJ50/MC9S08xx for above)
    • Gyro 3 axis L3G4200D (new part) $??? I2C
    • Accelerometer 3 axis ADXL345· $6.16 I2C
    • Compass 3 axis HMC5843········ $19.20 I2C
    • SMD085 (Bosch) 60-115kPa Pressure Sensor $8.97 or
    • BMP085 (Bosch) 300-1100hPa Pressure & Temperature Sensor $8.97 I2C
    • SCP-1000-D01· 30-120kPa Pressor Sensor··· $29.73
    • Ultrasonic Ping))) (optional - Parallax) $29.99 1-pin
    • GPS (undecided and for later) PMB-248 or PMB-648 (optional - Parallax) $24.99/$34.99 Serial

    Some of you may note that the 9DOF module from Sparkfun contains the first 4 Items and an Atmega 186 or 328 for $125. However, I want a prop!

    The Accelerometer, Compass, Pressure & Temperature·are I2C interface, so are easy. The SCP-1000-D01 is SPI and·likewise easy.

    The Gyros and SMD085 are analog and require ADC. Can I and do I use the prop or place a cheap chip in between for the conversion ???· More investigation needed.

    The other requirement is the interface between these sensors, the RC unit, and the motors. I think I will use a second prop here (you know I believe in multiple props so this should come as no surprise). I am thinking of whether to use existing ESC's or roll my own MosFet design. I rather like the flexibility of my own drivers using the prop to control them.

    Currently I have a Tower Pro 2409GS-18T Outrunner and 25A BEC (ESC). I am not sure if this is up to the task yet. $19.95 from HobbyCity. I will require 4 of these. I also have a Spectrum DX6i RC unit.

    Once I am happy with the design I will make the pcbs.

    Does anyone have any ideas, suggestions, comments, etc???

    To whet your appetite, look at these Youtube videos..

    http://vimeo.com/6194911

    http://www.youtube.com/watch?v=upko_2Z-z0Q



    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    Links to other interesting threads:

    · Home of the MultiBladeProps: TriBlade,·RamBlade,·SixBlade, website
    · Single Board Computer:·3 Propeller ICs·and a·TriBladeProp board (ZiCog Z80 Emulator)
    · Prop Tools under Development or Completed (Index)
    · Emulators: CPUs Z80 etc; Micros Altair etc;· Terminals·VT100 etc; (Index) ZiCog (Z80) , MoCog (6809)·
    · Prop OS: SphinxOS·, PropDos , PropCmd··· Search the Propeller forums·(uses advanced Google search)
    My cruising website is: ·www.bluemagic.biz·· MultiBlade Props: www.cluso.bluemagic.biz

    Post Edited (Cluso99) : 4/25/2010 10:32:20 AM GMT
    Last edited by ForumTools; 09-30-2010 at 08:33 AM. Reason: Forum Migration

  2. #2
    Cluso99's Avatar
    Location
    Sydney/Brisbane Australia or 'sailing on the high seas'
    Posts
    10,219

    Default

    Reserved for code

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    Links to other interesting threads:

    · Home of the MultiBladeProps: TriBlade,·RamBlade,·SixBlade, website
    · Single Board Computer:·3 Propeller ICs·and a·TriBladeProp board (ZiCog Z80 Emulator)
    · Prop Tools under Development or Completed (Index)
    · Emulators: CPUs Z80 etc; Micros Altair etc;· Terminals·VT100 etc; (Index) ZiCog (Z80) , MoCog (6809)·
    · Prop OS: SphinxOS·, PropDos , PropCmd··· Search the Propeller forums·(uses advanced Google search)
    My cruising website is: ·www.bluemagic.biz·· MultiBlade Props: www.cluso.bluemagic.biz
    Last edited by ForumTools; 09-30-2010 at 08:33 AM. Reason: Forum Migration

  3. #3
    Cluso99's Avatar
    Location
    Sydney/Brisbane Australia or 'sailing on the high seas'
    Posts
    10,219

    Default

    Reserved for schematics

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    Links to other interesting threads:

    · Home of the MultiBladeProps: TriBlade,·RamBlade,·SixBlade, website
    · Single Board Computer:·3 Propeller ICs·and a·TriBladeProp board (ZiCog Z80 Emulator)
    · Prop Tools under Development or Completed (Index)
    · Emulators: CPUs Z80 etc; Micros Altair etc;· Terminals·VT100 etc; (Index) ZiCog (Z80) , MoCog (6809)·
    · Prop OS: SphinxOS·, PropDos , PropCmd··· Search the Propeller forums·(uses advanced Google search)
    My cruising website is: ·www.bluemagic.biz·· MultiBlade Props: www.cluso.bluemagic.biz
    Last edited by ForumTools; 09-30-2010 at 08:33 AM. Reason: Forum Migration

  4. #4

    Default

    Cluso99 said...



    I have been getting ready for my next project... Well one that has been on the backburner since I got involved with Z80 emulation. And no, I am not giving that up either
    My brother has a quad copter. I think his design is using Atmel chips as microcontrollers. He doesn't write his own software, but uses something that was developed by others. I myself am not too interested in flight model construction, except for the programmatic side of it. It's just that I have a emulation problem that I find more fascinating, because it hides so well.

    I wish you good luck with your project!

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    He died at the console of hunger and thirst.
    Next day he was buried. Face down, nine edge first.
    Last edited by ForumTools; 09-30-2010 at 08:33 AM. Reason: Forum Migration

  5. #5

    Default

    To work out if you need an external ADC then you'll have to try and get an idea of your sampling frequency requirements and resolution. You can get pretty small multichannel ADCs in any case.

    I noticed as well that the LY530AL has a digital output.

    A friend of mine also really wants to build a quad or hexa-copter at some point, we were also wondering about scratch building the ESCs, there are plenty of designs out there and a single prop could probably control even six motors, decisions decisions.

    Graham
    Last edited by ForumTools; 09-30-2010 at 08:33 AM. Reason: Forum Migration

  6. #6
    Cluso99's Avatar
    Location
    Sydney/Brisbane Australia or 'sailing on the high seas'
    Posts
    10,219

    Default

    pullmoll: I am not so interested in the building part, but I certainly detest having to continually fix it after every single flight. My plane ended up being almost indestructable, having used thin marine ply in the end. However, the last flight (years ago) it nose dived (don't know why it did that - perhaps I clipped the field lights) and squashed the nose cone and broke the piston in the process. Otherwise, the plane is intact :-(

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    Links to other interesting threads:

    · Home of the MultiBladeProps: TriBlade,·RamBlade,·SixBlade, website
    · Single Board Computer:·3 Propeller ICs·and a·TriBladeProp board (ZiCog Z80 Emulator)
    · Prop Tools under Development or Completed (Index)
    · Emulators: CPUs Z80 etc; Micros Altair etc;· Terminals·VT100 etc; (Index) ZiCog (Z80) , MoCog (6809)·
    · Prop OS: SphinxOS·, PropDos , PropCmd··· Search the Propeller forums·(uses advanced Google search)
    My cruising website is: ·www.bluemagic.biz·· MultiBlade Props: www.cluso.bluemagic.biz
    Last edited by ForumTools; 09-30-2010 at 08:33 AM. Reason: Forum Migration

  7. #7

    Default

    Cluso, if you wanted to try fixed wing again then go electric and get an EPP foam model with a pusher prop, almost impossible to break. LiPoly cells mean wing loadings can be nice and low and flight speeds slow, much easier to fly. So called park flyers are ideal.

    Graham
    Last edited by ForumTools; 09-30-2010 at 08:33 AM. Reason: Forum Migration

  8. #8
    Cluso99's Avatar
    Location
    Sydney/Brisbane Australia or 'sailing on the high seas'
    Posts
    10,219

    Default

    Graham: According to the docs, the gyros only output an analog voltage, not a digital output :-(

    I have no doubt a prop can control up to 6 motors and take 6 chanel RC input as well. Then it would just be a matter of communicating serially, 115200 would be fine, to get the input data from a second prop interfaced to all the sensors. Another alternative is that one prop do all sensors and the RC, and the second prop just control the motors. Either way, it is a relatively simple job for the prop to control the motors.

    The biggest job is to interpret the data and thereby decide the various motor speeds.

    The way I see the project proceeding...
    • Drive 1 motor, determining the maximum and minimum rate of speed change possible
    • Read the gyros to ensure the platform remains flat
    • Drive 4 or 6 motors to keep the platform flat (tethered to the bench)
    • Add the pressure transducer to get the platform to hover at the same altitude
    • Increase and decrease the motor speed to change altitude
    • Change the heading
    • Do some acceleration tests, slowly at first
    • Change the platform pitch to move the platform forward
    • Initially limit speed and decent to try and avoid crashes
    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    Links to other interesting threads:

    · Home of the MultiBladeProps: TriBlade,·RamBlade,·SixBlade, website
    · Single Board Computer:·3 Propeller ICs·and a·TriBladeProp board (ZiCog Z80 Emulator)
    · Prop Tools under Development or Completed (Index)
    · Emulators: CPUs Z80 etc; Micros Altair etc;· Terminals·VT100 etc; (Index) ZiCog (Z80) , MoCog (6809)·
    · Prop OS: SphinxOS·, PropDos , PropCmd··· Search the Propeller forums·(uses advanced Google search)
    My cruising website is: ·www.bluemagic.biz·· MultiBlade Props: www.cluso.bluemagic.biz
    Last edited by ForumTools; 09-30-2010 at 08:33 AM. Reason: Forum Migration

  9. #9

    Default

    What a great little project.

    Obviously the key here is to keep things as light as possible. But Cluso is the expert there!

    Just as a teaser, I strapped a little video recorder ($15) onto a Syma S022 chinook ($80) and took a video of a flight over my house www.youtube.com/watch?v=igs_P5cyvls

    Comments and things I have learnt along the way:
    There are helicopters that are inherently stable, usually the counterrotating ones. This one has no heading gyro (sorry about the video spinning round!) but there are ones with heading gyros.

    I've got little gyro ones about 15cm long that are very stable. I then moved up to a 30cm one with a heading gyro that is (just) big enough to lift the video recorder. But I see on ebay the same design has been doubled again
    cgi.ebay.com.au/GYRO-3-5-Channel-RC-helicopter-Big-copter-28-inch-hot_W0QQitemZ260557120430QQcmdZViewItemQQptZRadio_ Control_Parts_Accessories?hash=item3caa6a23ae

    The catch with all these is you need a very calm day as the max speed is a slow running pace (most winds where I live on the top of a hill are deceptively fast once you get over tree height).

    Quad vs Hex vs Dual (Chinook) vs Mono. I'd be interested to brainstorm this. Say you took two chinooks and joined them together to make a quad - what extra weight could you now lose. One battery and halve the flight time? Some of the body?

    Re heading - the gyro does that very well, so you could control it with a compass if you wanted.

    Stability in 3 axes - yes.

    So - Pressure. I think those modules are getting cheaper and have resolutions of a few metres. So that should be enough to say "go up or go down slowly"

    And then you just have GPS - not sure how small they go.

    There seems to be a tradeoff between stability vs forward speed. If you want fast forward speeds it behaves more like a broomstick on your hand. I have one tiny helicopeter (a proper 4 channel one) that also has a gyro and has two settings for the user - 'fast' and 'stable'. For a hex or quad copter you would need to define those parameters in software.

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    www.smarthome.viviti.com/propeller

    Post Edited (Dr_Acula) : 3/14/2010 10:40:13 AM GMT
    Last edited by ForumTools; 09-30-2010 at 08:33 AM. Reason: Forum Migration

  10. #10

    Default

    Great, something I've always wanted to experiment with as well.

    Fly by wire with BDS C under CP/M , perhaps not:)

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    For me, the past is not over yet.
    Last edited by ForumTools; 09-30-2010 at 08:33 AM. Reason: Forum Migration

  11. #11

    Default

    Re "Fly by wire with BDS C under CP/M , perhaps not:)"

    Mock ye not! If I was writing the code, it probably would be in C or Basic.

    I think if Cluso was adding GPS he is thinking about Unmanned Aerial Vehicles. And then the big decision - do you put the the brains on the plane/helicopter, or do you have the brains on the ground? Advantages both ways, though 'brains on the ground' immediately implies a transmitter on the plane, and that adds weight, and if you can add a micro for the same or less weight, better to have smarts on board.

    All things being equal, I'd probably go for the absolute smallest propeller chip and try to leave out as much as possible, especially other chips and plugs and sockets and sd cards and memory chips. Which probably leads me to either Spin, Propbasic or Catalina. CP/M is probably overkill.

    If the platform is inherently stable (eg that big helicopter above, which I just bought, but there are more available) then the code might be as simple as ' take GPS setting, take off, go up 10 metres, turn North, go 10 metres, turn South, go 10 metres, check position with GPS re wind, turn to correct direction, go back to takeoff position, go down slowly'. Of course, that assumes the helicopter is able to handle the wind, which is one problem I haven't solved yet (only calm enough every two weeks or so).

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    www.smarthome.viviti.com/propeller
    Last edited by ForumTools; 09-30-2010 at 08:33 AM. Reason: Forum Migration

  12. #12

    Default

    Never mind the GPS navigation. I said "Fly by wire" i.e. your "Primary Flight Computer" or PFC as they call it on the Boeing 777. The first problem is to keep the thing stable in the air. This is going to require fast reactions and needs to be reliable. This rules out any remote "brains" by wireless link. Probably rules out doing it in CP/M as well:)

    Having said that, if I were starting from scratch I think I'd have the thing tethered with a wire link back to the PC. Develop all the control algorithms and parameter tweaking on the PC. Then port the finished code to Spin/PASm on the Prop. Well, apart from the low level sensor drivers that is.

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    For me, the past is not over yet.
    Last edited by ForumTools; 09-30-2010 at 08:33 AM. Reason: Forum Migration

  13. #13
    Cluso99's Avatar
    Location
    Sydney/Brisbane Australia or 'sailing on the high seas'
    Posts
    10,219

    Default

    Drac & Heater: You should really see what HexaKopter in Germany are doing... Forget the guys name but WOW! He is using GPS waypoints and turns the transmitter off. Cameras are all the go on the quadcopters

    I might have guessed you guys would suggest CPM - haha

    I have just updated the top post with a replacement pressure transducer which is $9 and I2C with Temperature as well. This is usually good enough to give approximate height control. Just as long as you remember, pressure oscillates twice daily on top of atmospheric changes. So everything is relative. I have a recorder display on my catamaran because if pressure drops suddenly a storm is brewing !!

    GPS is now small and cheap with inbuilt antenna but it has to be correctly located. This can come a little later. The Gyros still require ADC so maybe a Freescale 8 pin job here???

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    Links to other interesting threads:

    · Home of the MultiBladeProps: TriBlade,·RamBlade,·SixBlade, website
    · Single Board Computer:·3 Propeller ICs·and a·TriBladeProp board (ZiCog Z80 Emulator)
    · Prop Tools under Development or Completed (Index)
    · Emulators: CPUs Z80 etc; Micros Altair etc;· Terminals·VT100 etc; (Index) ZiCog (Z80) , MoCog (6809)·
    · Prop OS: SphinxOS·, PropDos , PropCmd··· Search the Propeller forums·(uses advanced Google search)
    My cruising website is: ·www.bluemagic.biz·· MultiBlade Props: www.cluso.bluemagic.biz
    Last edited by ForumTools; 09-30-2010 at 08:33 AM. Reason: Forum Migration

  14. #14

    Default

    Re "This is going to require fast reactions and needs to be reliable."

    The new helicopter designs coming out have solved a lot of this. Even a gumby like me can fly a model helicopter (and I cannot fly a model plane). I read once the concept of "update time" (maybe it was called something else), which is the number of times you have to make an adjustment based on what you see the helicopter doing. I think there was a figure of many times a second.

    Well with a counterrotating prop, a flybar and a gyro, the time constant is now about once every 10 seconds. You can take off, hover at about 1 metre (height is very stable), then experiment with each of the controls independently without worrying if the whole thing is going to crash. 10 second adjustments ought to be really easy for the prop.

    But you are right - for debugging and testing, two way telemetry makes sense. A very thin wire still has weight. Hmm - the little Yishi transceivers I use weigh about the same as the video recorder. I'll be interested to see what the lifting capability is for that big helicopter when it arrives. It *might* just be able to lift a transceiver module, matchbox clusoblade and perhaps even a video recorder too. If not, leave out the video.

    The transceivers could be made lighter by removing the brass connector for the antenna, and going for a bare length of wire of the right length (which is all that is inside the antenna anyway).

    Of course, hex copter = 6 times the lift. But 6 times the cost too!

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    www.smarthome.viviti.com/propeller
    Last edited by ForumTools; 09-30-2010 at 08:33 AM. Reason: Forum Migration

  15. #15

    Default

    "The LY530AL single-axis yaw gyroscope provides a choice of analog or digital absolute angular-rate outputs. LY530AL has a full scale of ±300 °/s and is capable of measuring rates with a -3 dB bandwidth up to 88 Hz, for the analog output, and 1kHz of output data rate for the digital output. Measuring 5 x 5 x 1.5 mm, the 16-pin LGA device also has a power-down pin to maximize overall system efficiency ensuring very low power consumption."

    The datasheet says it has I2C???
    Last edited by ForumTools; 09-30-2010 at 08:33 AM. Reason: Forum Migration

  16. #16
    Cluso99's Avatar
    Location
    Sydney/Brisbane Australia or 'sailing on the high seas'
    Posts
    10,219

    Default

    Graham: Interesting. The LY530ALH does not have I2C or SPI but the LY530AL does. However, the LY530AL is older and is no longer being stocked by DigiKey although they have plenty available now. There seems to be no dual gyros (pitch & roll) with I2C or SPI. They certainly would be nicer.

    I am always cautious about ST products - got badly burnt by them many years ago !!!

    BTW: I have an EPP wing (a pusher). That is what the kit was for but never finished it.

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    Links to other interesting threads:

    · Home of the MultiBladeProps: TriBlade,·RamBlade,·SixBlade, website
    · Single Board Computer:·3 Propeller ICs·and a·TriBladeProp board (ZiCog Z80 Emulator)
    · Prop Tools under Development or Completed (Index)
    · Emulators: CPUs Z80 etc; Micros Altair etc;· Terminals·VT100 etc; (Index) ZiCog (Z80) , MoCog (6809)·
    · Prop OS: SphinxOS·, PropDos , PropCmd··· Search the Propeller forums·(uses advanced Google search)
    My cruising website is: ·www.bluemagic.biz·· MultiBlade Props: www.cluso.bluemagic.biz
    Last edited by ForumTools; 09-30-2010 at 08:33 AM. Reason: Forum Migration

  17. #17

    Default

    Re "BTW: I have an EPP wing (a pusher). That is what the kit was for but never finished it."

    I've been pondering the best plane design for people who can't fly (which includes poorly programmed microcontrollers). I think it needs to have a large surface area, and then it will fly slowly. Slow = less damage. And the propeller (spinny thing, not the chip) can't be at the front as the front is the bit that flies into the ground/trees/fenceposts etc. So - a pusher is good. And I think and EPP wing answers all those criteria. Strong, light, less bits to break.

    I suspect you would get a longer flight time from winged aircraft compared with helicopters. You might even catch a thermal. Come to think of it, catching a thermal is something that needs to be detectable by the controller. Also the problem of an artificial horizon for flying in clouds. PIR detectors seem to work well. And or self stabilising designs, eg a wing with a dihedral.

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    www.smarthome.viviti.com/propeller
    Last edited by ForumTools; 09-30-2010 at 08:33 AM. Reason: Forum Migration

  18. #18
    Cluso99's Avatar
    Location
    Sydney/Brisbane Australia or 'sailing on the high seas'
    Posts
    10,219

    Default

    Drac: This is why I think a stabilised QuadCopter would be great. It can hover off the ground slowly and you can set the prop chip to only allow small changes and keep close to the ground until you get the idea of flying As soon as you let go of the stick the copter hovers giving you time to think about what to do next.

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    Links to other interesting threads:

    · Home of the MultiBladeProps: TriBlade,·RamBlade,·SixBlade, website
    · Single Board Computer:·3 Propeller ICs·and a·TriBladeProp board (ZiCog Z80 Emulator)
    · Prop Tools under Development or Completed (Index)
    · Emulators: CPUs Z80 etc; Micros Altair etc;· Terminals·VT100 etc; (Index) ZiCog (Z80) , MoCog (6809)·
    · Prop OS: SphinxOS·, PropDos , PropCmd··· Search the Propeller forums·(uses advanced Google search)
    My cruising website is: ·www.bluemagic.biz·· MultiBlade Props: www.cluso.bluemagic.biz
    Last edited by ForumTools; 09-30-2010 at 08:33 AM. Reason: Forum Migration

  19. #19

    Default

    There is a nintendo wii controller which is a 3.3V 3 axis gyro with I2C... and there is an object on Obex too.
    The unit is extremely small.
    You can get one anywhere, only trouble is the screws (tri wing type).

    Massimo
    Last edited by ForumTools; 09-30-2010 at 08:33 AM. Reason: Forum Migration

  20. #20

    Default

    Dr_acula, Cluso, Flying wings are very good if you are sure to get the CG right. Better in some ways are models with polyhedral (wings go up at each end) they are very stable. Lots of wing area for the weight (low wing loading) reduces flight speed and really helps. Free flight sims are available and are great fun and really help.

    Massimo, I just drill them :), the wiiplus module has them as well, someone stripped one and posted to the forum.

    Graham
    Last edited by ForumTools; 09-30-2010 at 08:33 AM. Reason: Forum Migration

+ Reply to Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts