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Model Forum / Radio Controlled / Helicopters / September 2006question about the T-rex
If the T-rex tail blades are belt-driven, then how can you controll the way it turns? you can not controll the speed of the tail rotor? It is controlled by the pitch of the tail blades, so that even though they turn at at a proportional rate to the main blades, the amount of foces changes based on the pitch. > If the T-rex tail blades are belt-driven, then how can you controll the > way it turns? you can not controll the speed of the tail rotor? Hi Tux, Cool question, the pitch of the tail blades somewhat controls the speed. It's like a engine and transmission. The engine can stay at one speed "RPM" but the gearing "pitch" can change the speed of the helicopter "lets the heli turn left or right". Hence, take a heli blade and turn around in a circle hold the blade at 15 degrees and then with the same speed; hold the blade at 90 degrees. Which blade will have less resistances, and which will turn faster. Enjoy and good luck with your flying, Jeff. > If the T-rex tail blades are belt-driven, then how can you controll the > way it turns? you can not controll the speed of the tail rotor? It is controlled by the pitch of the tail blades, so that even though they turn at at a proportional rate to the main blades, the amount of foces changes based on the pitch. >If the T-rex tail blades are belt-driven, then how can you controll the >way it turns? you can not controll the speed of the tail rotor? The TR on a belt or shaft drien heli works just like the full sized birds. It turns at a speed relative to the main rotor and is able to change the pitch of the blades in response to flight requirements. More pitch = more thrust. Increasing levels of pitch take more power and WILL suck power from the mains. Conversely, too much pitch on the mains increases the load on the motor/engine and will slow both the mains and the TR, increasing the anti-torque requirement of the TR. Low TR speed decays the effectiveness of the TR and it may not be able to provide enough thrust to counter that increased torque. The maneuver that takes the most power in a helicopter is an out of ground effect hover with a pedal turn in the same direction the mains are turning. can you cange the pitch of the blades by using the remote? | can you cange the pitch of the blades by using the remote? Yes -- that's how the force exerted by the tail rotor is adjusted in most helicopters with belt/shaft drives for the tail rotor. (The exception is helicopters where you have a seperate tail motor, like the Blade CP.) (You can also change the pitch of the main rotor using the remote in non-fixed pitch helicopters like the T-Rex and most other `not low end' helicopters. In this case, it's usually controlled by the throttle control so it changes along with your throttle.)  SignatureDoug McLaren, dougmc@frenzied.us `Sir, I protest! I am NOT a merry man!' --Worf, ST:TNG I understand that if you buy the T-rex kit, it is not enough, you must buy batteries, a transmitter, a reciever, do you also half to buy servos? because I dont think I should be buying a frame for $300, or are the servos included, if it is just a frame, where do you think I could get information about what kind of servos transmitters, receivers and batterys would best work with the T-rex? >I understand that if you buy the T-rex kit, it is not enough, you must > buy batteries, a transmitter, a reciever, do you also half to buy > servos? because I dont think I should be buying a frame for $300, or > are the servos included, if it is just a frame, where do you think I > could get information about what kind of servos transmitters, receivers > and batterys would best work with the T-rex? You can get package deals that have everything needed to fly the model but as a general rule, if all you buy is a kit, you won't get any of the electrics or electronics. You'll need to buy separately the motor, motor controller, batteries and battery chargers if you don't already have them, as well as the radio receiver, servos, and gyro. Depending on which T-Rex you're talking about, that $300 should be all the mechanics to build the model. That should include frames, drive gears, tail boom and tail rotor assembly, main rotor assembly with swashplate and all associated control systems and linkages, landing gear, etc. It won't include the stuff mentioned in the first paragraph. That's pretty much the case with any manufacturer. As for info on what support equipment to buy, there are a number of web forums that are full of info. Two that come to mine are..... www.runryder.com www.rcuniverse.com There are others but these two come right up. You can also get quality help from various venders. The people at... www.ronlund.com www.heliproz.com pretty much know their stuff. Good luck! will buying this: http://www4.mailordercentral.com/heliproz/prodinfo.asp?number=335600 enable me to fly it with everything included? > will buying this: > http://www4.mailordercentral.com/heliproz/prodinfo.asp?number=335600 > enable me to fly it with everything included? you still need the radio servos charger battery >will buying this: >http://www4.mailordercentral.com/heliproz/prodinfo.asp?number=335600 >enable me to fly it with everything included? Nope. You'll need batteries, servos, gyro, transmitter, receiver etc... Look at the 2nd to last sentence in the product description. This setup *WILL* get you everything you need to get airborne: http://www4.mailordercentral.com/heliproz/prodinfo.asp?number=335017COM You will have to build the helicopter and get it set up properly. You'll also need to program the radio properly. Finding experienced help will go a LONG way towards getting you flying, but if you can't, check out Finless Bob's videos over at www.helifreak.com. He's got an entire series on building up Trex's and getting them dialed in. The better you set up the heli, the easier it will be to fly it. Now, having said that, these things are NOT easy to fly and you WILL crash as you learn. The good news is, parts for the Trex are very inexpensive and it's a pretty rugged bit of gear. Servos, Transmitter, Receiver, LiPo Battery (at least one), LiPo Battery Charger (and possibly Power Supply for charger). The gyro is included (Logitech 2100) although I've never heard of that make/model. Cheers, Nigel >I understand that if you buy the T-rex kit, it is not enough, you must >buy batteries, a transmitter, a reciever, do you also half to buy >servos? because I dont think I should be buying a frame for $300, or >are the servos included, if it is just a frame, where do you think I >could get information about what kind of servos transmitters, receivers >and batterys would best work with the T-rex? The kit includes all the mechanics (and sometimes the motor and speed control depending on the kit) and possibly a set of blades. Servos, receiver, gyro, transmitter, batteries, charger, pitch gauge etc. are not included. RC helicopters is NOT a cheap hobby by any means. I've got $1,000 into my Trex 450SE, about $1200 in my Raptor 50 and I'll be at nearly $2,000 when I finish my Trex 600 this weekend. Oh, and I've got about $500 in my pseudo-scratch-built Blade CP. All of those prices do not include support equipment, tools or the transmitter. Check e-bay or the various classified ad forums on rc-helicotper related web sites. I bought my Raptor off Ebay and it's easily worth twice what I paid for it as it has all the metal upgrade parts and high-end digital servos. I've seen ready to fly Trex450s for as low as $300, but again, you'll still need a transmitter, batteries and a charger. |
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