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Model Rectifier Corp . EDGE Rotorblades . ReadyHeli

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Thunder Tiger Raptors 30-90 - Imperio > Lipo + UBEC for rx results
 
 
w.pasman
Elite Veteran
Location: Netherlands

My Posts This: Topic  Forum

I also use the duralite 5.1V regulator. I especially like the "switch off -> machine on" concept, much safer when the switch might break down.

It seems to work fine, can get 8 flights off my 2900 LiPo pack easily. That is with hard 3D stuff included.
I think you don't waste energy with these modern regulators, extra voltage is converted into extra capacity at lower voltage.

all details, including discharge tests etc, are here
http://graphics.tudelft.nl/~wouter/.../lipo/lipo.html

I made my own LiPo pack, in size equal to a standard 4-cell penlite pack.
That way I can put it right on top of the (raptor50) tank which makes perfect overall balance (tail servo in the front)


10-26-2005 Over year old.
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w.pasman
Elite Veteran
Location: Netherlands

My Posts This: Topic  Forum		What's the big deal with those UBECs versus the duralite regulator? Or is it just a cheap alternative.
10-26-2005 Over year old.
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Ben-T-Spindle
rrProfessor
Location: Central Illinois

My Posts This: Topic  Forum		I switched from Duralite to UBEC and it made I big improvement in flight time and runs much cooler. That’s the difference between the old obsolete Duralite analog technology and the UBEC digital technology.

Switching digital power supplies are what your computer uses – that’s where the technology was perfected.

I have two helicopters flying since spring and would never use anything else. The UBEC and a good 3s LiPo (not Duralite there are a lot of better brands on the market – I like TP) is definitely the modern way to go. If you have Duralite I highly recommend upgrading to UBEC.


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... BTS
10-26-2005 Over year old.
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spifff
Heliman
Location: Stockholm-Sweden

My Posts This: Topic  Forum		Its a big diff between Duralite and UBEC.

Duralite uses a linear regultaor which means that all voltage above 4.8V is discarded and converted to heat so they need a heatsink.
The more over voltage you have the more heat is generated
therefore you should only us 2s lipo packs in this config.
One advatage of the duralite is that it can handle bigger currents (7.5 amp)


UBEC is a switched regulator which means that all voltage above 4.8v
is converted to usable voltage, no heat is generated.
In the UBEC you can use 3-4s lipo packs without any problems.
The max load is 3 amp continious and 5 amp on peeks and thats enough for a 50 heli a least:
I dont know if 90 owners use UBEC.

As an example
I have a raptor 50 with all digital servos governor and GY 611.
When i used a NiMh pack a normal flight drained about 330 Mah
from the battery pack and after 4 flights it started to bog under max load.
After switching to a UBEC with a 1200 Mah 3 Lipo pack
the drain per flight is about 110 Mah and i can get at least 7 flights of
a pack. I havent tryed to get more out because it feels unnecessary
and i have a spare pack loaded in my toolbox.
10-26-2005 Over year old.
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ChristianM
Veteran
Location: Oslo, Norway

My Posts This: Topic  Forum		Switched regulators rock

I totally agree with Ben-T-Spindle and Spifff. I have been using a UBEC with a 3S 1200mAh LiPo battery now for almost two years with great success. You save quite a bit of weight and the performance from the servos are consistent event as the pack drains. Each 10 minute flight takes out about 140 - 150 mAh for the 3S battery so I safely get 7 flights out of it. I also have a HRPoly low voltage warning device that will beep and flash if the voltage starts to drop below a set point. Works like a charm

Christian

Burn fuel, be happy
10-26-2005 Over year old.
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helibird
Key Veteran
Location: St. George, UT

My Posts This: Topic  Forum		Ok,

since this thread has kind of come back to life....

Can everyone using this setup chime in on how they run the wires, switches, placement of ubec, connectors, etc. Still struggling with this switch issue, Don't want to put it back the way it was knowing it caused a crash.
10-26-2005 Over year old.
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ChristianM
Veteran
Location: Oslo, Norway

My Posts This: Topic  Forum		On my Raptor with the UBEC I am not using a switch at all, but connect the battery directly using Deans Micro Connectors. On my Revolution I am using two SBEC's (a 6 volt version driving the collective and cyclic servos and a 5 volt version driving the rest). The SBEC comes with a fail safe switch, i.e. the SBEC is on when the switch is open (off). The only thing to remember is to unplug the battery at the end of the day since the SBEC pulls a very small amount of current when it is turned off which can discharge the battery if left over a few days/weeks.

Christian

Burn fuel, be happy
10-26-2005 Over year old.
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sed6
Senior Heliman
Location: OKC, OK

My Posts This: Topic  Forum		I have a 5.4v UBEC on the way right now. I'm going to couple that with either a 1300 or 2100 mAh Thunder Power Lipo. I also plan on eliminating the switch and connecting the UBEC straight to the receiver. I'll post a pic when I'm done.


-------------------
-Scott D
T-Rex 600N
T-Rex 450SA

Practice at the field!
10-27-2005 Over year old.
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11290
Senior Heliman
Location: USA

My Posts This: Topic  Forum		No switch, Astro Zeroloss connectors, they match up with my Astro 109 charger.
10-27-2005 Over year old.
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chuckhager
Key Veteran
Location: Clovis, CA

My Posts This: Topic  Forum		Very interesting thread.

I fly electrics that use 7S and 10S lipos. I also use a UBEC and tap off my main lipo to run my receiver. Lately I've been thinking about cutting the UBEC from the main lipo and running a small 3S 1300 lipo separate from the main lipo.

I've heard of guys that have experienced shorts from the ESC, motor or lipos that take out the entire electrical system including power to the receiver and loose complete control of their heli. I would assume a separate power system to the receiver would eliminate one more source of potiential glitching.

Chuck Hager
10-27-2005 Over year old.
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w.pasman
Elite Veteran
Location: Netherlands

My Posts This: Topic  Forum		Thanks for the info
I'm amazed that duralite is not using a switched regulator, I expected it to be If not then, yes it's just wasting energy ...

For a UBEC I apparently would have to change the pack setup from 2S to 3S, not very easy either ...

Do those UBECs have a safe switch configuration (switch off=system on)?
10-27-2005 Over year old.
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w.pasman
Elite Veteran
Location: Netherlands

My Posts This: Topic  Forum
Quote 

1200 Mah 3 Lipo pack
the drain per flight is about 110 Mah


OK I can do about 8 flights on my 3000Mah 2 lipo pack.

3S pack is about 12V, that makes the pack 36Wh. In fact that's a larger pack than the 3000mAx2S pack that I use which equals to about 24Wh. I can safely do 8 flights. So although in theory the BEC would be better, apparently the loss in the duralite regulator is very little.
10-27-2005 Over year old.
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ChristianM
Veteran
Location: Oslo, Norway

My Posts This: Topic  Forum		As far as I know, the UBEC does not have any versions with a fail safe switch. If you want that then I would recommend the SBEC. You can get either one from for example FXAeorModels

Christian

Burn fuel, be happy
10-27-2005 Over year old.
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helibird
Key Veteran
Location: St. George, UT

My Posts This: Topic  Forum
Quote 
OK I can do about 8 flights on my 3000Mah 2 lipo pack


How much does that pack weigh? Just curious, the main reason that I decided on the UBEC was that it is over 100 for much of the summer, and having to worry about the regulator over heating was a concern. I'd be curious to find out the weight savings if any between a duralite setup and UBEC.
10-27-2005 Over year old.
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w.pasman
Elite Veteran
Location: Netherlands

My Posts This: Topic  Forum		My pack is 8x14.9=119.2g. That's excluding the PCB shrinkwrap and wires which may add a few grams. These are Thunderpower LiPo's.

If you want it really light you could take two 3000 LiPo packs. But I really needed it on top of the fuel tank.

PS a duralite pack 2800mAh is 5.6 oz= 158 grams. So LiPo is a lot lighter than the LiIons used by Duralite.
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w.pasman
Elite Veteran
Location: Netherlands

My Posts This: Topic  Forum		Christian

Thanks for that tip. But I don't see the fail safe mentioned on the link you gave?
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w.pasman
Elite Veteran
Location: Netherlands

My Posts This: Topic  Forum		I see a lot of people having had failing UBECs?

For instance on this thread on RR:
http://www.runryder.com/helicopter/t188792p1/
10-27-2005 Over year old.
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chuckhager
Key Veteran
Location: Clovis, CA

My Posts This: Topic  Forum		w.pasman,

If you read the entire post it looks like the UBEC's failed due to user error.
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ChristianM
Veteran
Location: Oslo, Norway

My Posts This: Topic  Forum		w.pasman

Here is the SBEC user manual. If you look under the heading Operations on the last page you will see described there. I know for a fact that it works since I am using two SBEC on one of my helis and have replaced the small switch that comes with the unit with a single Futaba switch. When the circuit is open (i.e. switch in the off position) then the SBEC is on.

Christian

Burn fuel, be happy
10-27-2005 Over year old.
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helibird
Key Veteran
Location: St. George, UT

My Posts This: Topic  Forum		I'd be a little nervous with the SBEC as it says that max current is 2.5 amps. Under normal conditions it probably would be ok but with a stalled servo or something an all digital setup could pull over 2.5 amps.
10-27-2005 Over year old.
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Thunder Tiger Raptors 30-90 - Imperio > Lipo + UBEC for rx results
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