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Home✈️Aircraft🚁Helicoptere-Century Radikal E640 - Swift 16 NX › ESC / pinion for 600+ on 7 Emolis?
05-23-2007 01:46 AM  13 years ago
litespeed600

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St. Charles, Missouri

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Congrats birthday boy!

Just for counterpoint, If I was you I'd go with a CC60 instead of the 85HV. With that motor you can never use a HV speedcontroller (too high of a KV)and the extra weight will be noticed especially on 4s. I'd use the extra money on an extra battery or parts. Last but not least if you have one of those really nasty crashes you could ruin a 190 dollar controller instead of a 130 dollar one. I would spend extra on a better radio or something that won't be damaged in a crash that you never know if you'd ever even utilize.

Enjoy the Heli my fellow heli 1966 brother from another mother!

Tom
Married with 2 kids, I am no stranger to pain!
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05-23-2007 02:55 PM  13 years ago
JustPlaneChris

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Austin,TX - USA

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Congrats birthday boy!

Just for counterpoint, If I was you I'd go with a CC60 instead of the 85HV. With that motor you can never use a HV speedcontroller (too high of a KV)and the extra weight will be noticed especially on 4s.
Thanks, Tom! I got similar advice over in RCG. In fact, some suggested an Align 75 as a way to save a few bucks, though Kirk over at New Creations has the CC60 for $99.95, not a lot more than the Align.

For radio gear, I'm sitting pretty with my JR 9303, and will use a 790 synthesized PCM RX. Cyclic servos I'm still undecided on, but am looking at:

Futaba S3151
Hitec HS-5475HB
Hitec HS-635HB
JR DS821

Any suggestions?

-Chris
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05-23-2007 05:48 PM  13 years ago
Ronald Thomas

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Gainesville, Fl, USA

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I use the Hitec HS-5475HB. They work great for me but I am NOT a hard 3D guy either...RonTeam MikadoUSA 480XXTreme, 550SX, 600SX, 700XXTreme, 800XXTreme!!
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05-23-2007 07:02 PM  13 years ago
accelerator

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Knoxville, TN

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Speaking of servos. What tail servo do y'all recommend with the 401 on the swift? I think I have the fut 3151.Swift, Trex450Scf, BCP, DX7
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05-23-2007 08:25 PM  13 years ago
Wheelhaus

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Denver

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you'll want something fast, the gyro needs to be able to make very quick corrections. anything .10/sec or faster will work very well.

Id recommend getting a digital servo for this, the 401 has a "digital" switch that allows the gyro to talk to the servo at a much faster data rate than a standard analog servo.

The best servo that fits both of these attributes is the S9254, it's limited to 5v so you may need a voltage step down if you're running 6v, but it's digital and transits at .06 sec. It is also the servo commonly packaged with the 401. The 9254 by itself sells for around $110 and is WELL worth it because it's so stupid fast for instantaneous reactions.

If you're running 6v and are on a budget, the Futaba S9650 (digital mini) is my next choice. It can be found for about $55. It's .10 sec on 6v (.14 sec on 5v) so with 6v it's very quick.
..........
Dave
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05-23-2007 08:31 PM  13 years ago
accelerator

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Knoxville, TN

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Thanks Dave. I use a 9650 on my Trex but wasn't sure I could use it on the swift.Swift, Trex450Scf, BCP, DX7
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05-23-2007 11:17 PM  13 years ago
JustPlaneChris

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Austin,TX - USA

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I'm using a Hitec HS-81 (5V BEC) on my T-Rex with the 401 and it works amazingly well. So well, in fact, that I was met with disbelief at a fly-in when everyone assumed I had a digital tail servo after watching how well the tail held. I'm sure if I did hard 3D I'd sing a different song, but for general messing around and basic acro, the lowly HS-81 does a remarkable job!

-Chris
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05-24-2007 06:31 PM  13 years ago
Richard Morgan

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Virginia Beach, Virginia USA

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A123 and a Hirobo Lama 30
Hello Guys,

I hope you all don't mind me slipping in here to ask a question. I am new to the whole elec heli sceen. I am currently converting a 30 size Hirobo Lama to electric for scale flying only and will be litening the frame up a bit. Projected weight 8.5 to 9lbs. My setup will be at this time:
1) Hacker A30 12XL approx 690 kv
2) CC Phoenix 80 ESC
3) Main Gear ratio 9.5 to 1
4) 8 or 9 Tooth Pinion
I am interested in using A123's, but was told that these would not work for me and that I should use Lipo 2 x 3S2P 4000mah instead. My thinking is that with the speed/rate and safty that you can charge A123's that I would just build them into the Heli at the best locations for weight and balance. So please, if you are A123 knowledgeable would you make a recomendation. Thanks guys!
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05-24-2007 07:37 PM  13 years ago
accelerator

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Knoxville, TN

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I have been charging my A123s while in the heli as they are pretty safe but concerning weight vs ampere capacity the lipo would be better but you would have to remove them to charge.

Also you really want the batteries to be located next to each other to reduce wire length.
Swift, Trex450Scf, BCP, DX7
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05-24-2007 07:47 PM  13 years ago
Wheelhaus

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Denver

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you could build them in, they are far superior to Lipos when it comes to safety, but for the given capacity, Lipos are lighter.

The A123's are limited in capacity, only 2300mah, so unless you run a lot of them (10s) your flights will be terrribly short and suffer from high amp draw. 10 A123's will deliver about the same voltage as 8s Lipo. Charging them "fast" will shorten the life expectancy and reduce the charge intake, so I'd recommend trying your best to fabricate a battery compartment or use the battery to simulate an engine block or something. Only having one pack and waiting 30-60 minutes between flights will really begin to suck after a while. Yes you can charge them in 15-20 minutes or so, but you'll need a burly charger and the cells can be more easily damaged or imbalanced.
..........
Dave
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05-25-2007 01:10 AM  13 years ago
Richard Morgan

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Virginia Beach, Virginia USA

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lama and A123
Thanks guys for the reply:

I have done a little more research, and found that 10s A123's come in lighter by an average of 32 grams over 2 x 3S2P 4000mah Lipo's of variuos brands. So weight is not the issue. Now if I run 8S (28.8v at 2300mah) or 10S (36v at 2300mah) A123's I am wondering if the "CC Phoenix-80 ESC" powering the Hacker A30-12XL motor drawing on average 17-18 amps can handel it with or without the BEC function. So, trading off amperage for voltage which I understand is more efficient, how long would the flight times be for purely scale flying? I am leaning towards the A123's at this time unless someone can point out an error in my assumptions?
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05-25-2007 02:22 AM  13 years ago
Wheelhaus

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Denver

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Standard brushless controllers can typically only handle up to 6s lipo (25v), you'll need a controller capable of handling more voltage than that, such as CC's HV series. A good ESC for this purpose would be the CC 45HV. It can handle up to 12s, and can handle spikes up to about 60a which shouldn't be a problem. I have a 10s A123 Century Swift (.30 sized aerobatic heli) that is very overpowered, and it spikes at 50-55 amps from some huge 1400 watt punchouts, the 45HV doesn't bat an eyelash.

so, first you'll need a "High Voltage" controller.

Flight times are too hard to predict accurately. If you keep the headspeed reasonable, you could get 7-8 minutes or more, but that is dependant on the pitch range and overall flying weight of the model and how its flown.. I get 6 minutes from my Swift with a 2100rpm headspeed and lots of hard maneuvers. When you do the first flights, keep a REALLY close eye after you pass the 5/6 minute mark, when the A123 cells dump (meaning end of the voltage curve) they dump very fast. Once you notice a drop in headspeed, simply land and note the length of the flight. Eventually you'll just use a timer to know how long your flight times should be.

The Hacker A30 12XL I'm not familiar with, just as long as it's the right Kv for the gear ratio and won't be over-revved. The Hacker motors can get pretty hot... For gearing, the idea is to use as small of a pinion as you can to achieve your target headspeed, as that will give the motor more torque to turn the blades.
..........
Dave
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05-25-2007 02:23 AM  13 years ago
accelerator

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Knoxville, TN

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CC80 is only good for 6s lipo or 7s A123 due to the voltage so you would have to go with at least a 45HV.Swift, Trex450Scf, BCP, DX7
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