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Model Forum / Radio Controlled / Helicopters / December 2006Collective pitch
I'm Jerry and new here, I'm very seriously thinking about getting into 'copter. Namely Blade cp pro. I've read everything on Radd Rotary Flight. My question for the pilots is, with collective pitch would you set the motor rpm and use the rotor pitch to get airborne, like the full sized passenger 'copters, or set the pitch and spin it up for levitation? I have a Blade cp pro myself - a really nice little chopper... You got it right on the first alternative: Keep constant rotor rpm and change pitch to ascend/decend. A side-effect of this is that you have to adjust the "power" to keep the rpm constant. The Blade CP has an electronic device that does this for you. Erik Sollie Trondheim, Norway > I'm Jerry and new here, I'm very seriously thinking about getting into > 'copter. Namely Blade cp pro. > I've read everything on Radd Rotary Flight. > My question for the pilots is, with collective pitch would you set the > motor rpm and use the rotor pitch to get airborne, like the full sized > passenger 'copters, or set the pitch and spin it up for levitation? >I'm Jerry and new here, I'm very seriously thinking about getting into >'copter. Namely Blade cp pro. >I've read everything on Radd Rotary Flight. >My question for the pilots is, with collective pitch would you set the >motor rpm and use the rotor pitch to get airborne, like the full sized >passenger 'copters, or set the pitch and spin it up for levitation? Yep. The CP's transmitter does the throttle/pitch mixing for you. Basically, you want the main rotors to maintain a specific RPM regardless of the pitch on the blades. Higher pitch will require more power from the motor to maintain RPM. Conversely, lower pitch will require less power from the motor. Just like the full sized bird, you've got to keep rotor RPM "in the green" I would *STRONGLY* suggest you visit www.bladecprepair.com and follow the mechanical setup instructions there. Those will get your mechanics set up properly and make it a bit easier to fly that little beasty since there's not much you can do with the stock transmitter on those helicopters to adjust it. Thanks guys, that helped me understand how it operates. Kevin the CP Blade Repair is fantastic, read the whole thing and filed it. I will probably buy the CP today, and hover it in a few months. LOL ....jerry >Thanks guys, that helped me understand how it operates. >Kevin the CP Blade Repair is fantastic, read the whole thing and filed >it. >I will probably buy the CP today, and hover it in a few months. LOL > ....jerry Good deal. For what it is, the CPs are pretty decent little ships. They'll never be as stable as a 30 sized heli, but then again, a 30 sized heli can't be had for $200. Good luck - and buy the training gear!!! Drove 30 miles from Hobe Sound Florida to Fort Pierce and picked up the Blade CP Pro, with 120 volt adapter and training gear, and tax it was under $300! I came home and said to myself, this is a mistake, this thing will be impossible for me to fly! I uncrated it, planing to charge the battery in a few days and read the manual and it said to keep a half charge so I plugged it in. The CP Pro is sooo cool, I'd be happy just to look at it. They fly them at the factory, but the fairing was rubbing against the main drive gear, which makes sense because they would put the fairing on after testing. I pulled the fairing and cut a minor swoop in it with a razor knife, neat job! I started to feel closer to this little machine. The battery was now charged so I unplugged the 2 motors, turned on the TX and plugged in the battery. WOW! ....I was amazed watching the swash plate and collective pitch action! I couldn't believe how smooth and accurate it was! Don't forget, I've never seen this before! I plugged in the motors, set it on the tiled floor of my great room and brought the throttle up to 1/4. Man just to see it sitting there with the 2 rotors clicking over was sooo cool! I pulled the battery and installed the training gear. I wasn't going to attempt this for a few days but I ended up doing Raad's first flying lesson! I spun it up to half throttle, it was almost weightless and set it down easy, spun it up and trimmed the rudder and I played hovercralft around the room with the training balls barely touching the floor! (2 beers helped) What a blast! I've never seen a rc chopper before and I was having fun!!! Gunna stick with Raad and do this for another 3 days and then try some 1 foot hops. First lesson .....had fun and no damage. ...jerry > First lesson .....had fun and no damage. It looks like we had the same idea about the same time. I just got mine and I'm really into learning all I can. You'll do yourself a service if you get the little G90 servo. It's very easy to install and it will maintain a heading, making it much easier to fly. The hardest part was moving the wires around and adding the small zip-ties so they were all neat and out of the way. But, that's part of the fun...taking it apart and rebuilding it the way I want it to be and learning as I go. It IS fascinating to watch as all the parts mesh and work together and...is very educational too. Today (day 4) I'm thinking of trying to hover. It's kinda scary, but I have a few sets of blades ready just in case. I think once I get past the "ground effect" things will be much better than just creeping across the floor just below takeoff speed. Just in case, I should have a lot more spare parts and a simulator arriving today. I'm not wanting to do 3D (yet) just hover and scoot around about 3 to 6 feet high and work on stability, fine tuning and balancing my rotors till they sing like angels. Yeah, it's very cool. >> First lesson .....had fun and no damage. Nicely done Jerry.. >I just got mine and I'm really into learning all I can. You'll do >yourself a service if you get the little G90 servo. I think you mean GYRO. > It's very easy to >install and it will maintain a heading, making it much easier to fly. Yes, it's heading hold so, once set up properly, will keep the tail where you leave it. Just realize that unless YOU move the tail, it'll stay right where it is. YOU will need to move the tail where you want it. >The hardest part was moving the wires around and adding the small >zip-ties so they were all neat and out of the way. But, that's part of >the fun...taking it apart and rebuilding it the way I want it to be and >learning as I go. It IS fascinating to watch as all the parts mesh and >work together and...is very educational too. Wait until your addiction gets you into bigger helos. Building the kit, adjusting the mechanics, installing the gear and dressing down the wiring (bigest PITA there is in these things if ya ask me) will all be worth it once ya hover the machine for the 1st time. >Today (day 4) I'm thinking of trying to hover. It's kinda scary, but I >have a few sets of blades ready just in case. I think once I get past [quoted text clipped - 4 lines] >work on stability, fine tuning and balancing my rotors till they sing >like angels. The better your setup, the better your machine will fly. In addition to www.bladecprepair.com, join the forums at www.helifreaks.com. LOTS of helpful people over there and a great online community. I've met 3 other RC heli nuts from my local area on helifreak that I'd never have known about if I wasn't there. > Today (day 4) I'm thinking of trying to hover. It's kinda scary, but I > have a few sets of blades ready just in case. I think once I get past [quoted text clipped - 6 lines] > > Yeah, it's very cool. I have just started using Plasti-Blades plastic blades on my CP and I am really liking them. They were balanced perfectly out of the package and run very smoothly on the heli. They have great lift and are almost indestructible. I put the thing in hard a few days ago and the canopy just disintegrated. The blades were unscathed in the accident and after refitting a spare canopy I was off and flying in no time. If I had had these blades while learning I would have saved a bunch of cash because the wood blades usually never made it through one crash or even just a minor tip over . Phil Glad to hear the CP's can take some bumping, mine looks so fragile I thought it would be totalled if it fell over. lol I have a REAL cheap plane ($30) and I've lawn darted it from 70 feet <ooohh> had to pull it out of the ground, and it's still alive. The blades sound great. ...jerry >I have just started using Plasti-Blades plastic blades on my CP and I am >really liking them. They were balanced perfectly out of the package and run [quoted text clipped - 4 lines] >while learning I would have saved a bunch of cash because the wood blades >usually never made it through one crash or even just a minor tip over . Be careful with those PlastiBlades.. In a crash something has to absorb the impact and if it's not the blades letting go, something else might. Also, the main shafts are VERY soft on these things so after a crash, slowly spool up the machine while watching the screw on top of the head. If it wobbles, you've bent the shaft. $6 and 15 mins to replace or you can pull it and try to straighten it. Roll it on a glass table. If it "ticks", it's bent. You can tweak it with your hands and do the roll test again. Also, check the tracking. The feathering shaft can bend in a crash which will throw the tracking off as well as introduce some vibration. Don't let this scare you, just keep in mind things could bend/break and check the heli out before you spool up. Oh, wood blades can be had from Heli Hobby (I think thats' where I get 'em) for $8/pair, or, buy Trex 450 blades and cut 'em to length - remember to rebalance 'em after you cut 'em. |
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