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CarbonXtreme . Midland Helicopters . HeliProz

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e-Electric Conversions > e-conversions?
 
 
KC
Elite Veteran
Location: WA

anyone savvy in converting glow helis to electric, how do you select what works or is it all just trial and error?
09-27-2003 Over year old.
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JonMann
Senior Heliman
Location: Clayton, CA

KC,

I just completed a eConversion of a Raptor50, flies great with LiPo batteries.

Goto ezonemag.com, lots of stuff on eHeli conversions there.
09-27-2003 Over year old.
 
 
Pipeous
Veteran
Location: Surrey, BC, Canada

I saw this conversion for the shuttle and was thinking about trying it out...
http://www.ewtech.com/cgi-bin/miva?...ades+for+HIROBO

What do you people think about this?
Is that a 600 size motor can?
What kind of power and cels would you suggest to put a shuttle up?
I am sure you could get a brushess combo to do more than 12 cels as shown, but I like the mounting ease. Any help would be appreciated.
09-27-2003 Over year old.
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Ben-T-Spindle
Elite Veteran
Location: Central Illinois

I have been flying a Raptor 50 conversion with Hacker B50-15XL and TP8200 6s4p batteries most of the summer. I have a Raptor 50 with TT50 engine. Both have the same performance except the electric conversion will run twice as long!

Now that’s incredible!

Isn’t technology wonderful!
09-27-2003 Over year old.
 
 
tim tompkins
Senior Heliman
Location: Boston, Georgia sw Ga. Thomas County

EL-Raven

I converted a century raven-50 to electric.I use two lipo packs to power it.8s4p totals 32 volts.I can fly it for aprox.30 mins. on a charge.The batteries are the key.The performance is limited to your wallet just like anything else.I chose the raven because I wanted to have eCCpm and I had one as a glow os-50 for experience.I use standard size servos and a futaba 401-9253 gyro set up.A ubec-battery eliminator powers the radio.I chose a hacker master speed control only because of the high voltage otherwise I'd recommend Castle Creations controlers.The keystone of the conversion is the gear mesh @ the electric motor and the first stage of the century.The pitch and size that works is the same as the minicopter Joker.The choice is 22,23,or24 that seem to get the desired headspeed.The motor is so much smaller that I added a heat sink from the lhs for rc cars.The motor mount is three sided box,open on the bottom,made of 60 thou.aluminum bent to size.A hole in the top and two 3mm bolts to hold it.Then the mount is bolted to the side frames as is the original motor mount. I made some angle brackets that sit on the sides to support the batteries.Then I used velcro to mount the packs to the brackets. TimT
09-27-2003 Over year old.
 
 
KC
Elite Veteran
Location: WA

how many cycles have you guys been getting from the thunderpower / LiPo packs so far?
09-28-2003 Over year old.
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hoverking
Veteran
Location: Tennessee

tim tompkins

what motor and speed control do you use size numbers ect....?
09-28-2003 Over year old.
 
 
Hughes500Pilot
Key Veteran
Location: Anaheim, CA

Electric Raptor 60

Take a look in my galley for a few shots of my Electric Raptor 60. -Steve



09-28-2003 Over year old.
 
 
Ben-T-Spindle
Elite Veteran
Location: Central Illinois

I have less than 50 on mine. TP says that they should last over 500 cycles at 5C discharge rate as long as you don’t discharge below 3v per cell under load.
09-28-2003 Over year old.
 
 
tim tompkins
Senior Heliman
Location: Boston, Georgia sw Ga. Thomas County

answer to hoverking

My El Raven has a mega 22/45/3 right now.I'm waiting for a c-50 xl hacker to be available to test .The power is about between a 30 and a 50.The headspeed is 1800rpms but the motor gets hot-170F if I load it up.The speed controler started with a schulze but it crapped out after five flights.That company has no pride and wanted me to buy it again instead of warranty.That unit was the recommended piece#fut-32.40K.DONT USE THIS
09-28-2003 Over year old.
 
 
rscamp
Veteran
Location: Ontario, Canada

Pipeous

Gosh. I can't imagine a Shuttle flying well on 10-12 cells. I converted one and used 20.

Rob
09-28-2003 Over year old.
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Pipeous
Veteran
Location: Surrey, BC, Canada

I will be getting the li poly batteries if I go this way, and a brushless, I just wonder about taking the plunge, whether I will find a motor for that bracket, and such.
09-28-2003 Over year old.
HOMEPAGE  
 
 
rscamp
Veteran
Location: Ontario, Canada

If you use 20 cells, a motor with a Kv of about 800 RPM/V would be good, like a Tango 45-08. Current would be awfully high with only 10 cells!

There is some info on the conversion here under Electric Flight. If you use LiPos, you can take advantage of the high voltage and use a motor with a lower Kv...

http://www.execulink.com/~rscamp/

Rob
09-28-2003 Over year old.
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Pipeous
Veteran
Location: Surrey, BC, Canada

Well I found the Fun 600 but the lowest KV is 1150 rpm/V. I am just going by the pic in the bracket, I imagine I could look at the motor can sizes and decide too...look at a tango etc

FUN600-11
1150 RPM/V
6-30 batteries / 2400mAh
5-40A cont.
55A short duration
Il 12V 0,6A
0,042 Ohm

recommended controllers..
Smile 40-6-18
Beat 40-6-18
Beat 40-8-24
Beat 50-8-30

So if I get the...
With 50A cont. current the BEAT 50-8-30 is a speed control for large salplanes and acrobatic models. Its unlimited partial-load operation and sensitive controlling allows you to concentrate completely on the flight.

50A continuous
60A short duration
8 to 30 batteries
Optocoupler
21gr without cable
37gr with cable
52x26x11mm
8x105um copper thickness
can be progammed with CPS Pro in April 2002 (Update without costs)
this will all fit the casing above and have the power capabilities for 20+ cels. It would just be a matter of gearing I guess from there, or programming?
09-29-2003 Over year old.
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rscamp
Veteran
Location: Ontario, Canada

Pipeous

You have been doing your homework!

A few comments for what they are worth.

The speed constant of the motor isn't the only thing to worry about. Efficiency at operating current and power dissipation should also be considered. This informaton isn't easy to come by, but qualitatively the Kontronik Tango is a proven heli motor and I think it is the best choice for this size of heli if you want to use Kontronik stuff. It runs quite cool. I would see if this motor will fit in the mount.

I have a Tango 45-06 in the Shuttle and a 45-08 in the Logo. The 45-06 is a bit slow, so the Shuttle is quite tame on 20 cells. If you had perhaps 24-28 volts at your disposal from LiPos, the 45-06 should work very well in the Shuttle. With LiPos, it makes sense to get more power from the available voltage (i.e. more power from the "V" in P=IV).

I'm really struggling to picture how a 10-12 NiCd/NiMH cell approach would provide good performance in such a large and heavy helicopter. I know of many who have converted this size of helicopter successfuly using 18-22 cells, but I know of no one who has used so few cells. Yes, it is lighter, but the airframe is heavy and the power system will require high currents (i.e. the motor will get very hot!) to provide reasonable performance. With electrics, the batteries are part of the motor (they determine available power through voltage), and only 10-12 cells makes the motor too small.

As for gearing in the Shuttle, if you use the stock pinion with the motor, controller and battery count suggested herein, it will work just fine.

The Beat 50-8-30 is a good choice. I have two of these - one in the Shuttle and one in a Logo 20. Very smooth starting and good current headroom. Governor mode makes set up a snap - no throttle curves.

I wouldn't worry about the CPS computer programming feature. I've tried it and found it is not really necessary. Sure you can vary just about anything you want, but I found I just didn't need to. The standard helicopter mode in the controllers works just fine.

Rob
09-29-2003 Over year old.
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hoverking
Veteran
Location: Tennessee

is there a motor and controller that will work on 20 cells now and later switch to lipos without any problem when i can afford it without buying a different controller?

chris
09-29-2003 Over year old.
 
 
rscamp
Veteran
Location: Ontario, Canada

Something fundamental I haven't mentioned. If you haven't already gathered this, you can determine the motor Kv you require from the battery voltage and main rotor gear ratio. The ratio (MR) is around 10:1 in your average heli, so for a head speed of 1600, the motor has to turn about 16000 RPM. Use 1V/cell for voltage and derate motor speed a bit to allow headroom for the governor. Thus, for a head speed of 1600 and 20 cells the motor Kv would have to be something like (1600X10)/(0.9X20) = 890. Your mileage may vary.

Hope this helps!

Rob
09-29-2003 Over year old.
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rscamp
Veteran
Location: Ontario, Canada

Hoverking.

A 30 cell controller should be fine unless you go for a really high voltage system.

Also, maybe a 600 RPM/Volt motor like the 45-06 would be a good compromise. Quite slow on 20 NiCd/NiMH (still flies though) but lower current demand on LiPos. Looks like 7s pack would be about right.

I haven't flown a heli on LiPos so I should defer to those with more practical experience.

If you can vary the drive ratio you'll have more flexibility, but I stuck with the stock Shuttle drive ratio of about 9.6:1.

Rob
09-29-2003 Over year old.
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Fisherman
Senior Heliman
Location: Hong Kong

Can you please share how to make the conversions.

I also interested in these project very much.

Thanks.
09-29-2003 Over year old.
 
 
hoverking
Veteran
Location: Tennessee

im trying to research alot on this before i buy because i see alot of people selling brushless motors because of them buying the wrong choice for what they want .

chris
09-29-2003 Over year old.
 
 
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