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Power system recommendation for zero 2100mm composite

Old 11-28-2015, 04:37 PM
  #1  
mikeang39
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Default Power system recommendation for zero 2100mm composite

Hello folks, just wanted to get some input with regards to a reliable power system for 2100mm Zero. Got an amazing deal with HK today. I hope to hear back from you guys. This is my first plane over 1400mm, thank you in advance.

Here is the link to the item.
http://www.hobbyking.com/hobbyking/s...dProduct=47079

Specs are as follows:
Specs:
Wing Span: 2100mm
Length: 1700mm
Wing Area: 80 sq. dm.
Flying weight: 6200-6500g
Engine: 40-50CC (Required)
Servos: 8-9 Standard Servos
Channels: 5-6

Requires:
5-6 Channel Transmitter and Receiver
40-50CC Gas Engine
Propeller
8-9 Standard Servos
60-90mm Spinner
Receiver battery
Building adhesives


PRODUCT ID: 108000012



1 1:IC/2:Elec 6 Channel 2100mm (82.68in) 1700mm (66.93in) 6200g (13.64lb)
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Old 11-28-2015, 05:29 PM
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fhhuber
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40-50CC... about 3500 to 6000 watts to fly it. You're looking at a 12S system with a 100 amp ESC minimum.

50cc gas makes about 6 to 7 hp. 5000 watts is right at 6.2 hp.

I'd go DLE55.

BTW.. "standard" servos won't do it... 150 in oz for the lightest servo in the plane. 300 in-oz rudder. I'd stick 200+ in-oz everywhere else if it was mine.

Plan on needing up to 15 amps peak demand on the RX power supply
http://www.horizonhobby.com/ar12120-...ver-spmar12120
And a pair of 2 cell LiFE appx 1000 to 2000 mah would handle it.
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Old 11-28-2015, 06:08 PM
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mikeang39
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Originally Posted by fhhuber View Post
40-50CC... about 3500 to 6000 watts to fly it. You're looking at a 12S system with a 100 amp ESC minimum.

50cc gas makes about 6 to 7 hp. 5000 watts is right at 6.2 hp.

I'd go DLE55.

BTW.. "standard" servos won't do it... 150 in oz for the lightest servo in the plane. 300 in-oz rudder. I'd stick 200+ in-oz everywhere else if it was mine.

Plan on needing up to 15 amps peak demand on the RX power supply
http://www.horizonhobby.com/ar12120-...ver-spmar12120
And a pair of 2 cell LiFE appx 1000 to 2000 mah would handle it.

Thank you for your input. I really appreciate it, but don't know where to buy these? Can you please direct me to the right website? Thanks again.
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Old 11-28-2015, 10:52 PM
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fhhuber
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Well its a gasoline, which on birds this large is less expensive and less trouble than the electric (probably soon to be about even... as e-power keeps getting better and bigger)

http://www.troybuiltmodels.com/items/DL55ENGINE.html

Constantly in/out of stock, rarely out long. I have 3

I have yet to find a reasonably priced electric MOTOR for this large of a plane. I have some ESCs that could do it.
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Old 11-29-2015, 01:07 AM
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Ya- way over the practical electric threshold IMO. Go with a DLE or Saito Gas 4 stroke engine.
12 S would cost over 200 in lipos alone. 6S x2 . Motor ? Wow . A big Hacker but not sure you can get enough watts.

She's a heavy bird. Retracts ? Allow another $300 for the size you'll need.
Nice looking Zero though. The only other concern I would have us the fiberglass construction. Heavy. Great looking finish but is a bear to repair. But that's just me.

Good luck!

Hawk
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Old 11-29-2015, 01:13 AM
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fhhuber
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Fiberglass can be light if done right, but then its fragile. I had a 2 meter pattern plane with glass-foam-glass sandwich fuselage. 1/2 oz cloth over foam thinner than the dollar tree stuff. It could handle 100G in flight. A slight bobble on a crosswind landing that barely drug the wing tip folded the fuselage up.

I did have a 4500 watt electric system in it... 11 lb rocket-ship.

The motor melted the stupid hot-melt glue they used to hold the magnets in. (proven to melt at 120F)
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Old 11-29-2015, 06:07 PM
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dahawk
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This one is a 14#er. A real Hoss ! Look for Hacker or AXI large BL motors. Very expensive though .http://www.wcrc.rchomepage.com/Repor...Conversion.htm
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Old 11-30-2015, 01:47 AM
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Hobbyking has a motor for that plane http://www.hobbyking.com/hobbyking/s...ner_Motor.html

You will need a high amp/ high cell count ESC http://www.hobbyking.com/hobbyking/s..._ESC_Opto.html

And at least two battery packs http://www.hobbyking.com/hobbyking/s..._6S1P_30C.html

Connected in series to get 12 cells

I have not flown these parts. so I am only listing them to answer your question about where to find the items.

The drawback to the electric set up lies in the shorter flight times versus a gas engine. At my field a plane this heavy would have a gas engine. I would be the only one brave or foolish enough to fly it electric. Of course it would work everytime unlike the gas engines.
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Old 11-30-2015, 02:04 AM
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fhhuber
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My experience with 5000 watt 12S says... avoid more than 4S packs and 3S is even better. 6S tends to have the center cells die early due to inability to cool.

3 X 4S or 4 X 3S in series for the 12S voltage works better.

Also the packs can then be used individually or in pairs for lower voltage aircraft. I used the 4S4400 mah and 5000 ma packs in my Dynam Me-262 (which calls for 4S 4000-5000) or in series for the big EDF in my avatar, which burned out an Astroflite Wattmeter (started smoking with 105 amp on the display, then melted down before I could do anything)

Pulling the packs from the big EDF they were typically 110-120F by IR immediately and temp would go UP by IR for up to 130-140F before coming back down. (It was important to get the packs out quickly and maximize cooling)

A big plane like these can deplete 12S 5000 mah in appx 3 minutes at high throttle. or you can carry the weight of paralleled packs for more duration. But that is going to affect performance.

By the time you get 1/4 the flight time capability seen with gasoline trying to use LiPo on the 50CC plane... you'll be 5 to 7 lb greater than the gas setup.
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Old 12-01-2015, 12:42 AM
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dahawk
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Here are the specs from the Seabart PC-21 which weighs about the same:

Hacker Q80-8M, 22x12E, Phoenix Edge HV 160A, 12S 4400-5000 mAh
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Old 12-16-2015, 04:11 AM
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mikeang39
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Thank you for all your input. I'm might just proceed with a gasser set-up.
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