How to - 12s T-Rex 600 Setup On A Budget.

[adroc3905]

Originally Posted by caralmar

I went with the mac-daddy!

http://www.readyheli.com/WRL-HBECS-W...1_p_36457.html

Is $99 too much to pay for a BEC? Well, if my 3 8717's, AR7000, CC110HV, and GY520/JR8900 electronics get fried, I'll be out of the hobby altogether, unable to recover from such a loss. $99 is cheap in comparison to that stuff and it has been SOLID.

With the CCBEC Pro, when I plugged it into my receiver, my servos would start chattering right away. I could put my fingers on the links to the swash and actually feel them vibrating constantly. It was noisy power. I flew a couple of flights with it this way but was never comfortable. It also came down very warm.

I called CC Support and they said that the chattering thing was not normal. They sent me a replacement, but in that time between BECs, I read all the nasty reports of people having catastrophic failures and frying all their electronics with that BEC. That sealed the deal for me.

Mine chatter............now you have me wondering.

[adroc3905]

How about this one:

http://www.readyheli.com/WRL-HBECHV-...t_p_36455.html

[caralmar]

Originally Posted by adroc3905

How about this one:

http://www.readyheli.com/WRL-HBECHV-...t_p_36455.html

Don't know what servos you're going to power, but that BEC is rated for 3.5amp, while the Super BEC is 10A continuous. I would go for the Super BEC and know I'm future proof.

Also, I think the CC issue with chattering servos is across their entire BEC line. I had the same problem on another heli with different servos and the blue BEC.

My 8717's center perfectly and never chatter, no matter how much collective wiggling I do. They're silent and move smoothly.... as they should. With the CC BEC, you could literally see the swash links move a mm up/down at certain points in time and they were loud.

Don't know what else to say. I guess I sound like a WR fanboy! I assure you I have no interest in this recommendation other than relaying my own experience with this product!

[adroc3905]

Awesome, out of stock everywhere I look. Readyheli says "in stock" until you add to cart.

Darn!

[jacobmarble]

Originally Posted by povern

Talking to Lucian yesterday, not out to the dealers yet, and not even on thier website, but they have 4025-550kv motors available for the Trex600's

These are made for the hardcore 3d flyers on 12s. Wonder how these will work?

I ordered one from Lucien. The 6mm shafts are out of stock for the next ~2 weeks.

[adroc3905]

Originally Posted by jacobmarble

I ordered one from Lucien. The 6mm shafts are out of stock for the next ~2 weeks.

Here is a new 6mm shaft for the 4025 series for $5 + shipping.

http://www.rcgroups.com/forums/showthread.php?t=1254390

[Alloybender]

I'm pretty sure the hyperion 4025 shafts are compatable as well from-
www.aircraftworld.com
I'm running the cc pro becs on two choppers, soon to be three, with no complaints so far. All of the gear comes down fairly cold after 6 mins of sport 3d. Lets just hope my run of trouble free luck continues!
Cheers
Steve

[meatbob]

I don't think the CC BEC Pro has an issue of overheating. Based on the reports I've seen thus far on this unit, it appears that it might have a failure mode that would allow high voltage to flood the output stage.

Personally, I have a CC BEC Pro, and also have not seen any issues. However, I've just ordered a WR Super Hercules just in case. Don't want to see my 12S ESP get the magic smoke. I'll hold onto the CC BEC Pro until there's a more exhaustive determination on why some people have issues with them.

[caralmar]

Originally Posted by meatbob

I don't think the CC BEC Pro has an issue of overheating. Based on the reports I've seen thus far on this unit, it appears that it might have a failure mode that would allow high voltage to flood the output stage.

Personally, I have a CC BEC Pro, and also have not seen any issues. However, I've just ordered a WR Super Hercules just in case. Don't want to see my 12S ESP get the magic smoke. I'll hold onto the CC BEC Pro until there's a more exhaustive determination on why some people have issues with them.

For whatever its worth, the CC Support guy I spoke with was very nice and tried to be helpful about it. He had me put the phone close to the servos to listen to the chatter and knew right away it was an issue. I can't say for sure, but it sounded like he had heard it before... you know how you're "busted" but try to play it off? He recognized the chattering way too quickly! Good luck to you though and I think you made the right choice with the WR.

[adroc3905]

Originally Posted by caralmar

Don't know what servos you're going to power, but that BEC is rated for 3.5amp, while the Super BEC is 10A continuous. I would go for the Super BEC and know I'm future proof.

Just curious but how necessary is a 10A current load a digi servo bird? I keep reading that max draw on standard size digi servos is 2A with an occasional 4A spike at servo stalls which usually does not occur in helis. So is a 10A BEC just an extreme overkill? I hate to spend $99 to find out that $50 is more than sufficient with regards to the WR BEC.

$50
http://www.readyheli.com/WRL-HBECHV-...t_p_36455.html

$99
http://www.readyheli.com/WRL-HBECS-W...1_p_36457.html

Sorry to sidetrack the thread but I feel this discussion is relevant to the 12s build since it concerns the BEC.

[SkinWalk3r]

Originally Posted by adroc3905

Just curious but how necessary is a 10A current load a digi servo bird? I keep reading that max draw on standard size digi servos is 2A with an occasional 4A spike at servo stalls which usually does not occur in helis. So is a 10A BEC just an extreme overkill? I hate to spend $99 to find out that $50 is more than sufficient with regards to the WR BEC.

$50
http://www.readyheli.com/WRL-HBECHC-...t_p_36454.html

$99
http://www.readyheli.com/WRL-HBECS-W...1_p_36457.html

Sorry to sidetrack the thread but I feel this discussion is relevant to the 12s build since it concerns the BEC.

take a look at the max voltage input on that $50.00 one. it only goes upto 45v or 10s Lipo

[adroc3905]

Sorry wrong link. I fixed it in the original post.

[caralmar]

Originally Posted by adroc3905

Just curious but how necessary is a 10A current load a digi servo bird? I keep reading that max draw on standard size digi servos is 2A with an occasional 4A spike at servo stalls which usually does not occur in helis. So is a 10A BEC just an extreme overkill? I hate to spend $99 to find out that $50 is more than sufficient with regards to the WR BEC.

$50
http://www.readyheli.com/WRL-HBECHV-...t_p_36455.html

$99
http://www.readyheli.com/WRL-HBECS-W...1_p_36457.html

Sorry to sidetrack the thread but I feel this discussion is relevant to the 12s build since it concerns the BEC.

Adroc, take a look at post #8 on this thread:
https://www.helifreak.com/showthread.php?t=56436

These 8717's can draw up to 8amps! So no, I would not go with a 3.5amp BEC.

[adroc3905]

I am not running 8717's....I am running the Align's which may have less draw but unsure at this time. Also here is the post #8

"Hello All- I run the same setup and the most I can get it to draw is 8 amps that is if I hold the swash still and jam on the sticks. I am currently running the 2in1 and 8717's with the 7703d and matching servo. Unloaded and jamming on the sticks I am pulling around 3.5 amps. Hope this helps!!
D"

If you hold the swash of course the amps will spike, you’re simulating a stall. Here is the next response from the same guy, post #11

"No problem!! Yeah 8.5 amps is a lot BUT that was with me holding them in a stall. In my opinion you will never have that much force @ the swash. I was worried about the 2in1 being able to handle it also but so far so good no issues yet! KNOCK ON WOOD!!1 thing I can definitely say is watch your receiver pack I’m only getting around 4 flights out of the Align 1900mah pack. So keep a close eye on that! Other than that all is good!!"

Per WR the BEC was tested for 48hrs in excess of 3.5 amps of uninterrupted operation. Hence it is rated low as a CYA thing for consumers.

I am not trying to prove anyone wrong and in the end its ultimately the owners decision to make but maybe a $100 BEC is an overkill and a more "budgeted" solution would be the $55 3.5A BEC. After all this is a budget 12s build thread.

By all means please chime with other opinions or even better Align amperage draws.

[caralmar]

I agree that most likely you'll never be able to generate that kind of amperage draw on a regular flight. The servos draw the most amperage when they're stalled. However, I think that if you have a bad enough crash, you could potentially stall one or more servos for a while until you get to the heli to disconnect the battery. I realize this is a "budget" 12s, but $50 is not much more to spend for something that powers everything else in the heli... if you look at pg.2 of that thread, there is someone there who did take measurements without stalling the swash and was able to draw 8amps.

[SkinWalk3r]

the instructions for the WR bec say to remove the positive red wire from the ESC...has anyone done this with a CC type esc ? something about them being opto-isolated and needing that wire to be connected seems to come to mind.

[baurwin]

i agree, 100 bux is not all that much for peace of mind, considering how much money worth of electronics is in there. a friend on a diff forum just fried his electronics on his compass 6hv using the cc bec pro. my 600 is on the shelf till i can get the wr hercules super bec in there. i just dont feel comfortable continueing to fly with it in there. too much at stake.

[ady]

hit the deck hard today after a total failure of the cyclics , one li-po went up in smoke and lots of damage done , these 12s rex`s are awesome

[lovespicyfood]

Originally Posted by ady

hit the deck hard today after a total failure of the cyclics , one li-po went up in smoke and lots of damage done , these 12s rex`s are awesome

HOLY SMOKES, so sorry to see the carnage!

What BEC were you using? Any ideas what happened?

Regards,
Pete

[azheliguy]

Originally Posted by ady

hit the deck hard today after a total failure of the cyclics , one li-po went up in smoke and lots of damage done , these 12s rex`s are awesome

My eyes!!!!!! Sorry about that!!