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Author Topic: Whats a cheap electric system?  (Read 1058 times)

Offline Glenn (Gravitywell) Reach

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Whats a cheap electric system?
« on: June 15, 2012, 11:43:27 PM »
Jon Moller's "Very Simple Electric Control Line" question in the All Amped Up section got me thinking.  What would be the cheapest and easiest way of getting into .40 size electric?
Glenn Reach
Westlock, Alberta
gravitywell2011 @ gmail . com

Online Tim Wescott

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Re: Whats a cheap electric system?
« Reply #1 on: June 15, 2012, 11:53:02 PM »
Turnigy batteries, motor and ESC from Hobby King, KR timer.  You'd have to price it out but I added it up once and I think it came out to less than $150.

You'll have the same problems with the Hobby King stuff as any other cheap Chinese: maybe it'll work and maybe it won't, if it does work, maybe it'll last and maybe it won't.

I've heard horror stories on this forum about the cheap stuff -- but other's like it.

One thing it will be is heavier for the power than the spendy stuff, or at least the batteries will.
AMA 64232

The problem with electric is that once you get the smoke generator and sound system installed, the plane is too heavy.

Offline Keith Renecle

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Re: Whats a cheap electric system?
« Reply #2 on: June 18, 2012, 12:32:29 AM »
Hi Glenn, Tim's suggestions are about right. To fly a decent stunt pattern you do require a governor system and the KR governor timer was designed to get around having to buy a high-end ESC (electronic speed controller) and need a degree in pc stuff just to fly a C/L model. I have had great success and have sold plenty of the Arrowind/E-Max 2820 motors. Some of the Hobby King motors are o.k as well but like Tim says, they are not always consistent in quality. The E-Max 2820 works well with an APC 11 x5.5 E prop and a 40 amp esc. To choose a suitable 40 size motor you can look at a weight of around 140 grams and a KV (rpm per volt) rating of around 900. Most of my customers have used 4-cell 2200 mAh lipos with a 25C rating successfuly. Here in Darkest Africa there are many such systems flying in my Eze-Pro profile. You can a look at my website if you like at http://www.keithrenecle.co.za/Electric%20CL.htm There is a link to the electric Eze-Pro plans as well that shows the E-Max motor in it. For a profile model this setup is also a competitive combination and will take you far in e-stunt.

I would also suggest that you have a look at the "Getting All Amped Up" section under "List your setup" where there many good setups to choose from. RSM Distribution stocks my timers and also has the ZTW esc's that are really good for the price. You are also most welcome to ask as many questions as you like, and there are many highly experienced guys on the electric section that will be only too happy to help.

Keith R
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Offline Fred Cronenwett

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Re: Whats a cheap electric system?
« Reply #3 on: June 18, 2012, 04:43:03 AM »
I have been buying my Lipos from Hobby King, then get the speed control from Hobby Lobby (eRC). The eRC speed controls are priced well and work great. For scale purposes I am flying with the G series of motors from Hobby King on some of my scale models. The G series of motors from Hobby King are identical to the E-flite motors in general size and specs (1/2 the price) but there are some differences in the mount and case, so they are not the same motor, but work just as well.

I would suggest a Lipo and G series (Turnigy) motor from Hobby King and the eRC speed control from Hobby Lobby.

I don't use a timer since I have throttle control so I have no idea on that topic.

Fred C.
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Offline William DeMauro

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Re: Whats a cheap electric system?
« Reply #4 on: June 19, 2012, 04:00:50 AM »
Glen,
 Read my column in the latest issue of Stunt News. This is exactly what I discuss.
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Offline Doug Knoyle

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Re: Whats a cheap electric system?
« Reply #5 on: June 21, 2012, 12:39:26 AM »
Propeller
3 APC 11x5.5 pusher thin Electric $4

Motor 1
Turnigy 3548/5 900 KV   $13.72
Spec.
Battery: 3~5 Cell /11.1~18.5V
RPM: 900kv
Max current: 43A
No load current: 2.2A
Max power: 770W
Note: Can't get this anymore. The new version is $21.59

Battery  $27.10 ea.
Capacity: 2650mAh
Voltage: 4S1P / 4 Cell / 14.8V
Discharge: 40C Constant / 50C Burst
Weight: 318g (including wire, plug & case)
Note: for a .40 to .46 size plane and (50+ oz) I wouldn't think of going less then 2650mah capacity.  These are cheap batteries and won't last if you abuse them.  You want don't want to use more then 80% of the capacity before charging.

Controller
Castle Creations ICE 50 Lite  $72.50
Note: This is the cheapest way to get data-logging - very glad I have it.  Some say they've looked at it once and never again.  If you don't go with data-logging functionality you can save a little doe here with something else.

Timer
KR ver.2 with Governor Gain  $37.50 (RSD Distributing)
KR Governor Programmer Unit  $13.00 (RSD Distributing)
Note: Love it - easy to program.

This flies my highly modified heavy ForeRunner (553 sq / 54oz) pretty well (if I could just get it trimmed right ;).
Currently running 5.2' laps at 52mph (no kidding) on 59'9" lines; 10K RPM exactly.  This uses about 2000mah of the 2650mah battery and the whole thing stays very very cool.  On a hot day (85 deg) you have to hold the battery to your cheek to see if it actually warmed up.

Here is THE OTHER part:  You'll want more then 1 battery as charging at 4 to 5 amps will take up to 30 minutes (don't charge over 5 amps if you want your cheap batteries to last).  You'll also need a charger.  Prices area all over the map - mine is a "Thunder Power TP610C-ACDC LiPo AC/DC Charger w/Balancer" which you can find for approximately $100.

Last comment - My flying buddy and I went cheap because we didn't want to spend big doe until we knew we had the right combo of motor/Bat/Controller/Timer.  Make sure you read the "List your setup" thread from beginning to end at least twice if you're feeling fuzzy about any of this.

Cheers and good luck,
Doug
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Offline John Rist

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Re: Whats a cheap electric system?
« Reply #6 on: June 21, 2012, 02:43:11 PM »
With a KR govener timer do you really need a $72 speed controller?
John Rist
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Offline Glenn (Gravitywell) Reach

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Re: Whats a cheap electric system?
« Reply #7 on: June 21, 2012, 06:18:24 PM »
Thanks to everyone that has replied.  A special thanks to Doug for outlining the costs.  William....I can't afford model magazines, but thanks for the suggestion. H^^
Glenn Reach
Westlock, Alberta
gravitywell2011 @ gmail . com

Online Tim Wescott

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Re: Whats a cheap electric system?
« Reply #8 on: June 21, 2012, 06:29:10 PM »
With a KR govener timer do you really need a $72 speed controller?

No, but if you want data logging you do.
AMA 64232

The problem with electric is that once you get the smoke generator and sound system installed, the plane is too heavy.


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