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HeliHobby . Ron’s HeliProz South . Century Helicopter

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e-Align T-REX 450-500-600 > T-REX 450 Phoenix 35 amp and BEC or not???
 
 
jaizon
Heliman
Location: Wilton, N.H. USA

So my question is this-- I just installed a Phoenix 35 into my 450 then read a comment on another board to the effect that I still need to install a BEC because the Phoenix is not up to par on that end. Anyone have experience with this? Do I really need to add one even though it's built into the Phoenix? I do mild sport flying, no hard 3d and now I'm confused. And this was not a cheap ESC either. Thanks.

Preston
07-18-2008 02:46 PM
 
 
2atlo8
Senior Heliman
Location: Cedar Park, TX -- USA

CC 35 is fine for your use. You don't NEED BEC unless you go to 4S. I have been running CC35's for several years at 3S with on problems.

2atlo8
3D is my age....in hexadecimal.
07-18-2008 04:23 PM
 
 
dct
Veteran
Location: San Angelo TX.

I agree,, the CC 35 in my bird has over 800!!! Flights on it and works like new! Running 3 cell TP 2200 batteries and Hitec 65mg servos and one Hitec 56 servo on tail.

**Now doing Forward Flight And EASY 3d! And having a Ball !!**
07-18-2008 04:38 PM
HOMEPAGE  
 
 
airsoft1779
Heliman
Location: Greenville,SC-USA

you will only need the bec if you have a digital servo/servos. It is made to handle 4 analog servos, but if you don't, it will work fine.

Trex 450 V2, Scorpion HK2221-6 on 11t, CC ph. 45, G770 3D w/ 9257, 65MGS.
07-18-2008 06:06 PM
 
 
jaizon
Heliman
Location: Wilton, N.H. USA

Thanks for the info, guys. I'm all set now.

Preston
07-19-2008 01:33 AM
 
 
baby uh1
Senior Heliman
Location: St. James, Mo.

I have something to add to this. Running a seperate ubec will remove a lot of heat from your esc even with 3 cells. Also it adds another layer of protection from control loss.
Up to you.
07-19-2008 03:59 AM
 
 
kimber1911
Heliman
Location: philippines

I been using cc 35 for almost 1.5 yrs now, have no single problem ( 3 cell). The reason why i install a seperate bec is I'm running my cyclic at 6 volts.

trex450,eraptor550, jrvibe90
07-21-2008 06:17 AM
 
 
ckoelliker
Key Veteran
Location: St. Simons, GA

Does anyone know the amp rating, if you are using a three cell lipo. I see that it is 3A for a two cell, but I cannot find out what it is for a 3 cell.

Why won't the Thunderbird esc work for a helicopter? I could care less about soft start or a gov? Is there another reason, because 36 amps plus a 3A bec on a three cell lipo, and the cost are very appealing.
07-21-2008 09:35 PM
 
 
mayday1
Heliman
Location: ca, usa

the thunderbird series have auto throttle calibration that cannot be
disabled. So if you set the throttle curve to below 100%, say at
0, 50 70, 70, 70, you'll still get 100% throttle even if your max
is 70%.

I use a TB18 successfully in a HBK2, but I set my throttle curve to
100%, and gear it to roughly the headspeed I want. Thunderbird
also starts quite abruptly, so I have to be very general at start up
to avoid spinning the heli on the ground and stripping the maingear.
07-22-2008 12:56 AM
 
 
ckoelliker
Key Veteran
Location: St. Simons, GA

Well, I run a straight 100% throttle. So would it work?
07-22-2008 01:28 AM
 
 
Pistol_Pete
Elite Veteran
Location: Tampa Bay non-Buccaneer

Quote 
Well, I run a straight 100% throttle. So would it work?

does your first throtle curve start at 100%?

thats why.

having soft start saves gears.

****

@baby uh1
Quote 
I have something to add to this. Running a seperate ubec will remove a lot of heat from your esc even with 3 cells.
Also it adds another layer of protection from control loss.

please elaborate on this.

<><>...the lunatic is in my head...<><>
07-22-2008 01:36 AM
HOMEPAGE  
 
 
ckoelliker
Key Veteran
Location: St. Simons, GA

Quote 
does your first throtle curve start at 100%?

thats why.

having soft start saves gears.

No, In normal I have 0/100/100/100/100. I have flown without soft start before without any problems, I could see this particular case as being a bit abrupt. If it reads any throttle position other than zero as 100%, then I could see where spool up could be an issue.
07-22-2008 02:34 AM
 
 
mayday1
Heliman
Location: ca, usa

I think if you run 100% flat except, the TB36 will work for you.
Personally, I'd spend the extra $25 and get a CC35. Figure
one crash will set you back more than the money needed to
upgrade to a CC35.

CC35 allows you to run the two new fancy governor modes,
and CC35 can handle brief burst of over 35A, while TB36
doesn't specify what current it can burst.

I only run a TB18 because I fried my CC25 and didn't want to wait
for the repair from castle. I've been using TB18 for several
months and still haven't sent in my CC25 for repair.
07-22-2008 03:03 AM
 
 
baby uh1
Senior Heliman
Location: St. James, Mo.

Pete,

When you run a seperate ubec you will still have control voltage even if your esc burns up! So you could auto to a landing and I can tell you losing all voltage in flight sucks. It turns your heli into a pretty colorful brick.

Also a switch mode doesn't generate heat as a by product like the bec in the esc does so it's more efficent and doesn't heat up the esc.
This is why you have to go to a ubec to run more than three cells.

Huey
07-22-2008 03:41 AM
 
 
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MTA Hobbies . Model Rectifier Corp . RCHover

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e-Align T-REX 450-500-600 > T-REX 450 Phoenix 35 amp and BEC or not???
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