Rx pack questions for my Logo 600 vbar.

[jamesotron99]

Hi all.

A thread over on RR got me thinking about this. On Bobby's advice I'm going with a FlightPower 2s2p 1600mAh rx pack with the duralite 6v regulator and 5v drop-down for the tail. My avionics will be:

Spektrum AR7000
Mikado V-Bar
Futaba S9252's on cyclic
Futaba S9256 on the tail

This is the first time I will be using even an rx pack, let alone a lipo one. I've been worrying about keeping the rx pack charged up and not over discharging it in flight - I presume that I have to do the typical 5 minute hover and then recharge it to find out how many mAh is going back into it.

How are you guys caring for your rx packs and how much flight time do you get between charges?
Should I pick up a second rx pack just to be on the safe side?

[ozace]

James, if you can wait on the lipo rx pack until you have the machine in hand it may be worthwhile making sure it fits in the frames. I am using a 1500FP lipo for my 600 at the moment but i am not happy with the way it mounts. I will be looking for a different form factor to fit into the rear of the frames (where mine needs to be). As to care of pack, i only use 3 packs for my machine (and no field recharge) so far i am only managing to take 1000mah out of the pack so i dont worry about it until i get back home.

[OICU812]

A little FYI, expect WR to have a 10amp HV BEC coming out in the near future. :wink:

[Foamy Love]

A little FYI, expect WR to have a 10amp HV BEC coming out in the near future. :wink:

Castle already has one out. I talked with one of its designers, and off the record, it will handle well over 10 amps.

[LITHIUMSTATIC]

What would a 10amp BEC benifit?

[Foamy Love]

No power loss for Spektrum users since the new 8717s are capable of drawing 3.5 amps each.

[BobbySmith]

The Castles becs drop voltage bad when you get to mcuh load and causes the whole system to shut down They know about and are suppose to be fixing it . It works great in a normal applications such as 9452's 611 or 6100 gyro the next issue it is limited to 6s and i think t hey are looking into that as well

James iam running 8717's Vbar flying for 6 solid minutes and on 5 flights i put around 800 to 900 mah the1600 2s2p seems to mount the best on the bottom of the frames


I agree the 1500 doesnt mount well

Sean that is great news we need i high end Bec with all the electronics we are using on these machines
Bobby

[OICU812]

Yea I can tell you the CC one I don't trust, after seeing one up close I would much rather use the Western Robotics one. There have been reports on more than a few sites of the CC ones not handling and smoking out, kinda like a good chunk of their escs''''' Flame suit on, I have had alot of CC escs fark up on me and I gave up on them till they get their QC in check!

[OICU812]

What would a 10amp BEC benifit?


Well for the much higher amp pulling servos such as 8717, 9000, 8515 servos Jeremy. The 8717 "can" under binding situations or "extreme" loads pull spikes over 3.0 amps each, very rarely but can. This is where a continuous BEC of 10A with burst ability to 15 would be a safe headroom device.

[LITHIUMSTATIC]

Well for the much higher amp pulling servos such as 8717, 9000, 8515 servos Jeremy. The 8717 "can" under binding situations or "extreme" loads pull spikes over 3.0 amps each, very rarely but can. This is where a continuous BEC of 10A with burst ability to 15 would be a safe headroom device.

Thanks Shawn. I don't see myself needing such nice servos in the near future.

[BruceW]

Has anybody seen any specs on how many amps a Futaba BLS451 can pull? Its torque rating is between the 9452 and 8717.

[OICU812]

Thanks Shawn. I don't see myself needing such nice servos in the near future.

Hey the 9252s are "very" trustworthy and proven. I run them on my Logo 5003D man, work fantastic.

[Ticidytoc]

After my little incident today I pulled my 5A BEC and tossed it into the bin. Seems I can get the 8717's to pull over 5A on the bench with 7A spikes using a watt meter.

I was also able to make the AR9000's data logger turn off with fast cyclic inputs while connected to the BEC and the voltage was dropping below 5V with no load on the servos. Not my idea of a good time, so back to the Flightpowers with a 2 cell lipo direct.

I'm using one of these for the tail: http://www.spektrumrc.com/Products/Default.aspx?ProdID=SPMVR5203

Fortunately I didn't ball up the 600, just a squirrelly auto onto the dirt and spent the rest of the day reworking the setup.

No more BEC nonsense for me.

:FThat

[CatchmyCorsair]

Yea I can tell you the CC one I don't trust, after seeing one up close I would much rather use the Western Robotics one. There have been reports on more than a few sites of the CC ones not handling and smoking out, kinda like a good chunk of their escs''''' Flame suit on, I have had alot of CC escs fark up on me and I gave up on them till they get their QC in check!

Are there any other trustworthy HV ESC's besides Kontronik?

[OICU812]

After my little incident today I pulled my 5A BEC and tossed it into the bin. Seems I can get the 8717's to pull over 5A on the bench with 7A spikes using a watt meter.

I was also able to make the AR9000's data logger turn off with fast cyclic inputs while connected to the BEC and the voltage was dropping below 5V with no load on the servos. Not my idea of a good time, so back to the Flightpowers with a 2 cell lipo direct.

I'm using one of these for the tail: http://www.spektrumrc.com/Products/Default.aspx?ProdID=SPMVR5203

Fortunately I didn't ball up the 600, just a squirrelly auto onto the dirt and spent the rest of the day reworking the setup.

No more BEC nonsense for me.

:FThat


Wow really man? That sucks, were your leads from the BEC to the rx extended or standard length? Inicident,,, are you saying the BEC cutout entirely and caused the rx to reset or what are the details on this?

[OICU812]

Are there any other trustworthy HV ESC's besides Kontronik?
Schulze, but they are "very" expensive, $400 and up for one you would want to use on a 8S and up cell count.

[Ticidytoc]

Shawn I replaced the dainty wires that come with the BEC with 20ga. wire.

I will make up a really short jumper to confirm its the BEC, but voltage drops on the bench to less that 4.6V is not good when it's set to 6V. Doing crack rolls will cause it to dip like this on the bench as well.

I was doing tight snakes on the deck when it started to feel weird. Not sure it reset or what, I was too busy fighting it at this point. The swash got unresponsive and felt like it was cutting in and out. Its all fuzzy man, I was too busy thinking don't scratch the effin skids matt.

[LITHIUMSTATIC]

I was doing tight snakes on the deck when it started to feel weird. Not sure it reset or what, I was too busy fighting it at this point. The swash got unresponsive and felt like it was cutting in and out. Its all fuzzy man, I was too busy thinking don't scratch the effin skids matt.

Dude that sucks! :thumbdown:

[Ticidytoc]

Ya Jeremy, I'm happy I didn't ball it up man. Whew.

I'm going to hook a data logger to the bec and record the output on the bench. I also need to make up some jumpers and see what the draw is while in the air with the 2 cell lipos. I just haven't had much time for all of this misc. work, too many other things going on over here.

I will let you guys know what I find, if its a bad unit or too much current, wires, etc....

-Matt

[OICU812]

Just a question. I see as you say you beefed up that wiring, but then of course going into the receiver you would have to have an original sized wire going into the rx yes? As well "since I do not know" how much amps throughput will the micro-deans handle? Not saying they would not be enough I am just curious as well.

This really sucks man, I know what this feels like and most times I am not so lucky to save it. :mad:

[Ticidytoc]

Micro Deans will do 10A if I remember correctly.

After the deans I use 20ga silicone wire into the RX as well, on 2 ports. Same 20ga silicone wire the Flightpower RX packs came with originally.

Here is a picture of the wire, stock on left, 20ga on right.

-Matt

[Flybar-less]

I run a 2S RX pack with twin HD JR leads soldered to it, connected to twin JR HD leads to the RX. Flight stuff is: JR 921, 8717s, Vstabi, Spektrum data recorder, Emcotec 5.2 Volt "inline" regulator to the 8900G. I can safely get 4 flights on a 1320 MAH pack. No switches or BEC. Full charge is 8.4 V, and I run down to 7.2V before dropping in a new pack.

My rec for a BEC is the Ultimate Bec, 6A 6V.

[BobbySmith]

Ticdytoc

I have seen that about 4 times trying some differant stuff and it was all with a bec i have even seen it shut off in flight .. I went to a 2s rx pack wiht a regulator after the 4th time

Havent seen the Castle bec smoke and i have alot of flights on them in another 6s machine wiht 9451s and 6100 gyro. But inn the 600's wiht the 8717's and Vbar it iwll shut down when you move the sticks fast

Bobby

[Foamy Love]

Havent seen the Castle bec smoke and i have alot of flights on them in another 6s machine wiht 9451s and 6100 gyro. But inn the 600's wiht the 8717's and Vbar it iwll shut down when you move the sticks fast

Bobby

Interesting. I use only Duralite but was looking at the Castle because its lighter. I think I'll stick with whats proven itself to me time and time again. Good ole Duralite 5.5v regulator with a 1550 2s LiPo.

[jamesotron99]

Thanks for all the feedback guys. Seems like there's a lot of different ways of doing this. At this stage I think I'll stick with the duralite, but I'll keep my eyes on what everyone else is doing.