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Pictures! Electric Tacos

Old 05-23-2004, 11:37 AM
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scole
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Default Pictures! Electric Tacos

Hey guys, i'd like to start a tread for all of those electrified tacos out there.

My dilema: I don't have the money to electrify the real taco fat free, the motor and batteries and a new Pheonix 35 are just to much.
I have a P25, 3S 1550's, and an AXI 2212-34 that i am going to use to electrify my Taco.

What i am going to do: Using the wing rib templates that come with the Tacos i am going to cut wing ribs out of depron and use 3/16" square balsa as spars. I am going to use the construction techniques used in the Airwave Sukhoi I used to have. I am going to make the fuse out of 3/4" 1.5# EPS styrofoam capped on the top and bottom with 1/16" balsa sheets for torsional strength. All the surfaces are going to be made out of depron which I have already cut out.

I am shooting for an airframe weight all covered at 6oz and and AUW RTF at 14oz.
Old 05-25-2004, 10:56 AM
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PaulSwany
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Default RE: Electric Tacos

Here's my ETaco. Here's the setup:

AXI 280824 Outrunner
Jetti Advance 40p ESC
2 Kokam 3 cell 1500 mAh Batteries

It's got good power.. But it's not half the bird Chuck Auger came up with...... Hopefully he'll chime in here and lay out his setup.... I really like the mods he came up with for the airframe.... I'll be incorporating those changes into the ETaco kit.... He got his covered airframe down to something like 7 oz.!! He nixed the fiberglass rod and ply motor mount, use a CF tube that goes all the way to the motor. Then he nixed all of the sheeting on the wing.... Really nice setup.... Very well done.
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Old 05-25-2004, 12:39 PM
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Texas 3D
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Default RE: Electric Tacos

Hey Scole, I don't think the Axi 2212/34 will work well on this baby unless you can bring the Taco in at 15oz, and I doubt that. The Axi 2212/34 should really be used for that weight range if you want to 3D the Taco. I would build someting else if you don't want to invest in a different motor. There are lots of choices out there for that motor.
Just my $0.02
Ask Chuck Auger for his setup and mods on the Taco. It flew awesome at the Mempho Pro Bro.
Old 05-25-2004, 03:31 PM
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Default RE: Electric Tacos

I am using a really light EPS foam fuselage, this isn't going to be an ordinary taco. The wing is done and weighs less than 2.5ozoz, i have yet to get the foam for the fuselage, but all the flying surfaces are done and cut out of depron and they don't even weigh an ounce. Have you ever seen the airwave sukhoi? Same construction techniques as that plane, but a little bit smaller.

Have faith my friends!

I'll let you know the AUW when it is done.
Old 05-26-2004, 10:41 AM
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Default RE: Electric Tacos

Here's some info on Jeff's ETaco:

Some pics of a radically altered E FF Taco. AUW 25 oz.

Lehner 1020/15 Phoenix 35
Cobri aluminum gearbox 12 tooth SS pinion, 70 tooth spur
12X6 APC SF prop
Tanic 3S 2600
Berg 5
4 X Dymond D200 Servos.

It was an amazing combo, lost to a midair on it's first evening out.
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Old 05-26-2004, 11:05 AM
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ChuckAuger
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Default RE: Electric Tacos

I've flown a 15 oz plane on a 2212/34 and it wasn't too impressive. If you just built a flat foam Taco-shaped plane, you could get it in lighter. FWIW, the wing in the pic Pauly posted weighed less than 2oz.
Old 05-26-2004, 02:30 PM
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Default RE: Electric Tacos

Oh well, i'm still going to try. What prop are you using Chuck? I can get close to 32oz of thrust with a 12x3.8.
Old 05-26-2004, 02:47 PM
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ChuckAuger
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Default RE: Electric Tacos

I ran a 12X6 GWS SF and an 11X4.7 GWS SF on the 2212/34. I also did a little mod to a 12X6 to try to keep it 12" diameter but a little less load. The plane flew, and would hover, etc., just not over the top power like from a flat foamy/ Razor~Himax combo.

Alfster had a 2212/34 on a GW Yak this weekend, nice power, but still not like a Razor 350/ GWS D gear. I really don't think you will want to be over 13 oz with a 2212/34.

The plane Pauly posted used a 12X6 APC SF, 60 oz or so of thrust.
Old 05-26-2004, 03:00 PM
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Default RE: Electric Tacos

Chuck, the Christen Eagle with the Axi 2212/34 weighs 14 oz and probably 14.2 now after some repairs and added epoxy. It has enough power to pull out of a hover with authority. Any heavier then that I think it wouldn't be to good. Your Chuck flyer has definitely more power (better) compared to the Eagle. I think the Axi would rock on a 11-12 oz airframe.
Scole, best thrust with the 2212/34 is the APC 12x3.8 . Good luck, and let us know how it worked.
Old 05-28-2004, 06:40 AM
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Default RE: Electric Tacos

Chuck, could you get a Lehner to pull about 40oz of thrust at under 25 amps? I am thinking about asking for one for my birthday, but i already have a Pheonix 25, and i dont want to buy a 35.
Old 05-28-2004, 07:39 AM
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ChuckAuger
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Default RE: Electric Tacos

If you are looking for something in that range, try a Razor 2500 without the gearbox. Lots of power and less than 25 amps. The Lehner could do it, but it's like buying a Ferrari and putting a brick under the accelerator pedal.
Old 05-28-2004, 10:27 AM
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Default RE: Electric Tacos

I think the Tanic Packs are going to be the shiznit!! The new ones will be 2500 mAh with a 12C continuous discharge!!! With spikes to 15C.... Plus the cool thing with Tanic is they provide intra-cell jacks to balance your cells....
Old 05-28-2004, 10:29 AM
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ChuckAuger
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Default RE: Electric Tacos

Well, you flew 1500 Tanics just after the 1500 Kokams. Could you tell any difference??
Old 05-28-2004, 10:39 AM
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Default RE: Electric Tacos

The plane definately had more power.. I'm guessing from the higher discharge rate....
Old 05-28-2004, 08:07 PM
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Default RE: Electric Tacos

My Yak that is powered with the Axi 2212/34 is right around 14 oz, and it is UNDERPOWERED ! It will hover, and will pull out, but not like it should. I agree that 12oz is about the heaviest AUW that you would want with this motor. Anything over 12-13oz, you will just have a marginally flying airplane.
Old 05-28-2004, 08:54 PM
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Default RE: Electric Tacos

I'm looking at a AXI 2814 12 with a 40 amp Advanced Jeti ESC with the Tanic 2600 pack....

I'm hoping it will be the farizil on my nizle...
Old 05-28-2004, 09:19 PM
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ChuckAuger
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Default RE: Electric Tacos

The HL site has that motor rated at 130 watts on a 11X7... If my set up was only 75% efficient (it's a lot higher than that, just using super low numbers for comparison..) I would be putting out 250 watts. On a 12X6. Just something to take into consideration if you haven't made a purchase yet.
Old 05-28-2004, 09:32 PM
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Default RE: Electric Tacos

Is that before or after the gear reduction.??

How do you do that calc?
Old 05-28-2004, 09:49 PM
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Default RE: Electric Tacos

I Whattmetered it at 335 watts. I can't read German, but these are about 90% efficient motors, and figure 10% for a gearbox.

The HL figure of 130 watts on a 11X7 is on 7 cells, which is 2S lipo. It goes up to 207 at 10 cells, roughly 3S voltage..but on a 9.5X 5. You have to run a smaller prop as voltage increases.

Another way to look at it.. I can turn a 12X6 SF faster than they claim to turn an 11X7, they don't specify what 11X7 they are running. I can turn a 12X6 E prop a LOT faster, but it doesn't have the static (3D) thrust like the SF.

Also, they mention 4.6oz for the bare motor. My motor/gearbox/Prop/Prop Adapter/Wiring/ESC weighs less than that.

Not trying to talk you out of the Axi, just not sure what level of performance you are after.
Old 05-28-2004, 10:20 PM
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Default RE: Electric Tacos

I'd like performance like I experienced with your etaco.... Much better than mine....

I'm hoping that with the reduced weigh and better batteries I'll at least be better than my first generation E Taco...

Can you send the info on where to get that Lerhner?
Old 05-28-2004, 10:51 PM
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Default RE: Electric Tacos

You just have to Email Troy at www.b-p-p.com. He always shows the 1020/15 as out of stock, but he gets them in and sold so quick he never updates his website. He might have them, you just have to ask. I got the Cobri gearbox from www.e-flightline.com but B-P-P has them listed as in stock, just not yet on the site. The 1020/14 is always in stock, you could run one of them with the 12 tooth pinion (that's the smallest that will fit on the Lehner shaft) and like a 76 tooth spur, and have almost identical performance to the 1020/15 and a 12 tooth pinion/ 70 tooth spur.

I would not run anything but the Cobri gearbox on this motor...just not worth it.

4000X11.1=44000/5.83=7615 This is the 1020/15 at 4000Kv on 11.1V nominal and 12 tooth pinion/70 tooth spur (My Set Up)

4286X11.1=47575/6.33=7515 This is the 1020/14 at 4286Kv on 11.1V nominal and 12 tooth pinion/76 tooth spur (In Stock Set Up)

Of course the pack voltage drops when you hit the throttle, those numbers are just for comparison. That is the theoretical no-load RPM.

That's really close, actually a hair easier on the packs with the 1020/14 at 6.33:1

And as a side note... I turn the 12X6 APC SF prop at 86% of the above calculated RPM. Of course, the voltage is at about 10.1 when I tached it and all, so this is not a measure of system efficiency, just an interesting tidbit.

As another side note.. I took my measured RPM/Theoretical No-Load RPM at 10.1V and got 94% efficiency. And that is thru the gearbox.
Old 05-29-2004, 01:14 AM
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Default RE: Electric Tacos

Hmm, never thought of electrifying my Taco...[X(]
Old 05-29-2004, 10:49 PM
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Default RE: Electric Tacos

Wait for Pauly to come out with the E Taco mods... You can have a much lighter airframe with smooth E Power, and with the plane staying the same size, the flight performance if just super. Like 7.5oz/ sq ft wing loading [8D]
Old 05-30-2004, 12:01 AM
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Default RE: Electric Tacos

Ahh, ok, cool. Thanks
Old 05-30-2004, 12:24 AM
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Default RE: Electric Tacos

I just finished the drawings... and I have some 1/4 cf tube comming.... Should be able to get this bird going soon.... First version will have the AXI mount... For all out performance... I'll do a mount for the Lerhner/cobri setup too...

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