Need some Electric Help

[sweetpea]

So here's the deal.

I won this PAU plane at the BellAir Bigbird (Thanks PAU!).



Wingspan:
60”
Fuselage:
55”
Weight:
6 - 7.5 lbs
Engine:
2C .50-.70 / 4C .70-.90

I hate glo, so I plan to go electric. I was planning on a complete HobbyKing order for this plane. The reason why? I'm really trying to learn how to 3D and I don't want to lose a bunch of expensive equipment until I know what I'm doing.

So help me out..........

Here's what I'm thinking right now.



Model : TR50-65D-270
Input Voltage : 14.8V~36V
Kv : 270 rpm/V �} within 10%
Current capacity : 70A/60s
Dimensions : 50mm X 65mm / 1.97in X 2.68in
Shaft diameter : 8mm / 0.31in
Weight with cables : 414g / 14.60oz
Number of poles/magnets : 14
Power equivalent : .50 to .72 glow engine

Recomended Prop: 6S: 19x12 / 8S: 16x10
Recomended ESC: 80A




Spec.
Weight: 85g
Size: 70x50x13mm
Cells: 4-8S Li Po
Max Current: 85A
Burst : 95A
No BEC
Timing: 1/7/15/30 programmable
PWM: 8/16K

Features.
Constant current 85A Max 95A <10S
Li-Poly 2-7 cells
Dynamic Braking
BEC: opto
Auto shut down when lose signal
Slow down at 3.0V per cell Lipo, Cut-off at 2.9V per cell Lipo 0.8V NiMh




TRSP-19x12
Turnigy Electric Ultra-light wood propeller 19x12

[sweetpea]

As for batteries, this is where I need help.

I can get a 6S pack from HK but I don't have a charger that can do that. Can I get 2 3S packs and wire them up to work in the plane as 6S and still be able to charge them as 2 seperate 3S packs?

Can someone help with a diagram of what I need to do?

[sweetpea]

I'm thinking HD servos or JR821. Whichever come out cheaper also.

[sweetpea]

Anyone?

[IBTRIN]

nothing like free stuff
http://brantuas.com/ezcalc/dma1.asp
here is link for a motor calculator, I think the 270 kv is a little low for a 6s system.

http://www3.towerhobbies.com/cgi-bin...&I=LXNKY9&P=ML
here is a link for a series connector, can make your own easily, but the price is right-.. here

I don't own any turnigy motors, but you might want to try and read up on them, I believe there is another series of their motors out, that are a little more reputable.
I haven't read anything bad on their speed controllers.

[joeo78]

just be careful its decent stuff but the prop shaft on mine was a lilttle tweaked not to bad but not perfect seems like decent stuff though the flight times with there packs seems to get shorter and shorter i bought there .60 sized yak same motor different esc like i said it is decent stuff for the price you cant beat it

[Kiwi]

Pea.

I have that same motor in a big Super Frontier I built for a young guy to learn to fly. 80 amp ESC and a 5S 5000 Mah pack in it.

Its not even close to suitable for your setup but for the trainer it has a ton of grunt, 8 to 10 minute flying time and swings a 17 x 10 E Prop. Its a whale load of fun and the guy has no trouble setting it up and flying it. Never had a dead stick with it yet either. :-) Draws about 45 amps at full throttle so everything is just having an easy life.

What your proposing is a 6S setup and more prop and that should work fine. The bigger prop and the extra 3 volts will make a big difference.

As for the charging department a 6S charger is about 40 bucks these days and if you want a real good one, I mean the best in all honesty and its upgradable over the internet etc etc. The best darned chargers I have ever used and thats is gods honest truth. http://www.hobbycity.com/hobbycity/s...alance/Charger

Once you go electric Pea go careful, its way too easy to get hooked.


Oh and use a separate power system for your servos and receiver setup. It will pay you back I promise. A simple lipo with UBEC will do it all and give you the separation from flight pack to control pack.

[Neogenesis]

I just ordered a full hobbyking setup...however went a bit different than you. I put mine in a OMP 67" Fusion profile.

Went with the TGY Aerodrive SK 50-65 270k 2100 watt motor.
http://www.hobbycity.com/hobbycity/s...idproduct=7709

For a ESC I went with the TURNIGY Sentilon100A HV 5-12S BESC (Ver4).
http://www.hobbycity.com/hobbycity/s...idproduct=4691

I also am running it on 8s. 2 4s packs.

I've yet to maiden it, but have no doubt it will make enough power. On the bench, with a APCe 17x10 prop it was only pulling 45 amps. I forget the RPM at the moment, but it was making enough power to fly the plane as is. I chose the better ESC for the programming options and for future applications.

Just another option to look at. I was impressed with the fit and finish of the motor, I made a total of 3 bench runs on a 17x10 and a 18x10 prop, and only with the 18x10 was the motor thinking of getting warm. That tells me there is a lot more power left in it if needed.

Hope this helps,

Neo

[sweetpea]

Ok- so the motor/ESC combo sounds like it will work out if I use a 6S pack.

I've got a nice turnigy charger now (upto 4 cell) so I think going with the two 3cell packs in series to get the 6S is the way to go for right now. I'll double check all the costs though and see if its not cheaper to get the charger and the 6S pack instead. I also have the Fromeco Cube so I could charge packs on that as well (though no balancer for that)

UBEC will be done as well. [B][I've got some small foamie lipo packs I could use. What size do you suggest there Kiwi?/B] And about how many flights should I expect on a pack that only runs the RX and servos.

[sweetpea]

Neo thanks for your response as well. I'll look at your setup.

How do I check the amp draw? I have a nice digital electrical meter that an electrician might have (though I have never used it for anything) and I have the easy to use H9 amp/V digital meter. Can I use either of those?


For electrics I've always just bought what other people used and then just flew. I've never checked crap out. I tend to push my electrics hard (at least the ducted fan versions).

[Neogenesis]

If your ordering through hobbycity.com anyway....just get a watt meter. It'll give you all the info you'll need. You jsut wire it inline for a ground test. Or if you want to spend more money, get a data logger like a eagle tree.

http://www.hobbycity.com/hobbycity/store/uh_viewItem.asp?idProduct=6380&Product_Name=Watt_M eter_&_Power_Analyzer_(Watts_up)

oh...and I used this UBEC with a 2 cell lipo as it should provide more amps than ever needed.
http://www.hobbycity.com/hobbycity/s...idproduct=6233

Neo

[sweetpea]

Works for me........thanks for the updates. I just got handed a project at work that will keep me busy this week so I won't get started on the plane for at least a week but it should go together rather fast. I already checked out the instruction manual.

What kind of props are you guys using? HK seemed to only have larger wood electric. I was really hoping for a plastic electric.

[Neogenesis]

I use the APCe "electric props". From what I've read they are the best out there.


Neo

[sweetpea]

I like the APC knock offs on HK but they didn't have the size I wanted. I'll have to order else where for that then.

[Kiwi]

	Quote: Originally Posted by sweetpea
	UBEC will be done as well. [B][I've got some small foamie lipo packs I could use. What size do you suggest there Kiwi?/B] And about how many flights should I expect on a pack that only runs the RX and servos.

Pea,

Look I always say a ball park figure on an airplane with 6 to eight servos is 200 MaH per flight. While electrics are easy to setup and fly I rarely ever get more than 4 to 6 flights in for any given day.

Thus a pack from 1500 to 2000 will see you way more than covered and if your looking to keep it really light then get two 1000 MaH packs. They cost all of $10 or so now from HC.