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| Giant Scale Aircraft Discuss Giant RC Scale Aircraft. |
Topic Review (Newest First)
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| 03-28-2015 10:02 PM | ||
| bhughes |
Re: Giant Scale - Use digital servos or not? If your using life packs or similar 6.6 sized I would suggest these. http://www.pro-rc.ca/savox-sh-0251mg...vo-0-18-222-2/ Cheap servo and should be fine for a warbird. I've seen them used in 100cc 3d planes (twin Aileron setups ) and they worked great. My favorite choice but more expensive because their faster and more tourqe and titanium geared is the 1256tg |
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| 03-28-2015 07:09 AM | ||
| davidmc36 |
Re: Giant Scale - Use digital servos or not? Quote:
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| 03-28-2015 07:03 AM | ||
| BAMDFISHER |
Re: Giant Scale - Use digital servos or not? Quote:
On RC GROUPS the transmitter software engineer, Andy Kunz commented that the only people who could really tell the difference in feel when using the faster frame rate were very complicated heli setups and very extreme 3D flyers. There is an excellent thread at:- http://www.rcgroups.com/forums/showt...7153&page=1768 It has a lot of programming information about your radio. I've learned a lot of neat tricks on how to program my DX18. The thread covers all of the current Spectrum radios. |
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| 03-26-2015 04:37 PM | ||
| mrrandyman |
Re: Giant Scale - Use digital servos or not? Quote:
I guess I better check my DX9 manual. I had no idea that I had to change the frame rate when mixing servo's. Glad you posted this. Thanks |
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| 02-19-2015 06:59 PM | ||
| fsone |
Re: Giant Scale - Use digital servos or not? To me I fly 1/4 Scale Edge 540 and Extra260 have always used analog servos . If you are flying 3d I would suggest digital if you are a sport flyer doing aerobatics as usual high torque analog should be no problem. |
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| 02-18-2015 07:05 PM | ||
| mwavesdave |
Re: Giant Scale - Use digital servos or not? I've never seen the need for Digital, flying up to 1/4 scale warbirds. For me, it's simply a price issue, the hi-torque analog servos I've used are tried, true, proven, and, knock on wood, I've never had one fail. But, having said that, David's description of the workings of analog vs digital makes perfect sense. If you've got the budget, go digital. Do you need to? How much are you investing in the aircraft? I've seen guys invest serious coin into an aircraft, then buy cheap HK retracts to save a few bucks, and had them fail, destroying a whole lot of time, money and effort. To risk mitigate, I rotate servos out, after no more than 3 seasons, aileron servos go to rudder useage, anything non-critical to flight, same for elevator servos. It's all a balancing act of your budget, level of reliability, and, do you feel lucky? lol |
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| 02-18-2015 06:41 PM | ||
| LEE |
Re: Giant Scale - Use digital servos or not? Digital. Nuff said |
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| 02-17-2015 09:18 PM | ||
| G-RIDE |
Re: Giant Scale - Use digital servos or not? Hi Jim> You can use Any brand-name certified (Spektrum/Hitec) analog/digital servo combination. However: If you connect analog+digital servos in your 8000 rx you have to use 22ms frame rates vs. 11ms 4all digital - (DX7s Owners manual). FYI - Digital servos r more linear + + $$. Happy Flying//g. |
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| 02-17-2015 09:17 PM | ||
| davidmc36 |
Re: Giant Scale - Use digital servos or not? A tidbit from Digital vs Analogue article: Analog servos show their limitations because most control inputs are fairly small. So, 50 times per second the servo is seeing that it needs to move just a little, so its internal electronics briefly pulse the motor in the correct direction until the feedback pot tells it it’s in the correct position. Then the motor shuts off and waits for further commands. Because the motor is getting such short pulses of power, the analog servo neither moves as fast nor generates as much torque as its specs would lead you to expect. By the same token, if the servo is deflected by an external load, it’ll “give” a little before it really starts to put some muscle into resisting the load. You can feel this if you try to turn the output arm on an analog servo; it feels a little spongy, and the harder you turn, the more the servo growls as it tries to resist the added load. By contrast, a digital servo’s internal microprocessor generates hundreds of control pulses per second. So for small control inputs the digital servo reacts sooner, moves faster and generates more torque. Incidentally, this high-frequency control loop is why digital servos “sing” under load rather than having the lower pitched “growl” of analog servos. http://www.modelairplanenews.com/blo...og-vs-digital/ |
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| 02-17-2015 09:13 PM | ||
| JoeT |
Re: Giant Scale - Use digital servos or not? To simplify things: Analog servos: The farther away from intended position the greater the torque it applies to get to the location. Analog servos deliver torque to the outputs slower. Digital Servos: Apply max torque as quick as possible to move to the desired position. High end servo's will deliver power pulses 333hz (333 times / second) or greater and apply torque as required. Centering position (when you let the stick go) on the digital servo's are amazingly quick and precise. Digital servo's will also work in tigher frame rates than Analog Servo's ( 11ms vs 22 ms on Spektrum). Very low latency, yes you can feel it, specially when you go back to analog from digital. There are budget Digital Servo's that rival the quality of the big name servo's today, with amazing reliability and smoothness. Have a read at this article: http://www.futaba-rc.com/servos/digitalservos.pdf A summary from the article above: So If You Need: • Higher resolution - less deadband, more accurate positioning • Faster control response - increased acceleration • Constant torque throughout the servo travel • Increased holding power when stationary |
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