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midwest sukoi to electric

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Old 10-21-2010, 03:24 PM
  #1  
sasktag
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Default midwest sukoi to electric

I used to fly my .40 size midwest sukoi with a ys .63 4 stroke. It had fantastic performance but haven't flown it in years. I found the engine very fussy and moved on to different airplanes. I think it's time to try electric and thought of converting the little sukoi. Wingspan is 54" and it weighs just under 3 lbs including airframe and servos with everything else stripped out. I thought the E-flight 4046A motor with the e-flight 60 A speed control would fly it pretty well. All up flying weight should be around 5 lbs after electric conversion. Does this sound allright to you guys and what size battery should I use. 4s or 5s, how many mha? and 20C, 30C? 7 to 10 minutes would be fine for me. Any thoughts would be appriciated. Trevor
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Old 10-25-2010, 05:35 AM
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Default RE: midwest sukoi to electric

Trevor,

Okay here we go ... power of a YS63 will be in the 5S-6S territory, best is to go 6S swinging something like a 16x10 prop at 6.5K RPM, thereabouts. As for ESC go for 80A once and for all, the Turnigy one works well and its cheap. It has a power supply circuit for your RX, no need to use a separate power supply or device to do so. I used a couple of them and they work well.

For batteries think carefully about 5S or 6S. For 5S you can get decent power for a 40/50 sized plane but not strong 3D flying. A 6S set up will give you great power. Your 5S packs can later be put together for a 10S set up ... for 6S you can go 3+3. Size should be around 3,000-3,300 mAh and get 30C-35C packs, forget the 20c-25C ones. The 3,300 mAh packs will get you around 6-7 mins flight but not 10 mins. That would be pushing it.

Motorwise from what I can say is get something that is equivalent to an AXI 4130/16 on 6S. Something in that class. If its a 5S set up get a motor that size but higher KV, say around 500 such as the Rimfire 5055-500, that sort of motor would be nice for 5S.

So on 6S you can expect this sort of performance:

[youtube]http://www.youtube.com/watch?v=lJ8krGmWVzA[/youtube]
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Old 10-28-2010, 07:24 PM
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Default RE: midwest sukoi to electric

Thanks for the reply.
I'm new to electric's so a few more questions. You said go for the 80A ESC once and for all. So does this meen I can run the 80A esc on a smaller system later on if need be (say a 40A or 60A setup)? Is the Turnigy TR_P80A esc the one your talking about? I don't have enough prop clearance for a 15 or 16" prop. 14" max.
Would the rimfire .55 42-60-480, 14-10E prop or there abouts, a turnigy 80A esc on a 5s 3000mha pack give a decent setup? All up weight would be a touch under 5 lbs. It's not a 3d plane but at least 1 to 1, power to weight would be nice.
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Old 10-28-2010, 10:56 PM
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Default RE: midwest sukoi to electric

Sas ... Using a 80A ESC when you only need 60A is ok. The Turnigy one I use is the red one called PLUSH. Comes with a built in UBEC, that supplies power to the RX and will run up to 5 servos with no problems. As for the Rimfire I am unsure but I used a DualSky 4260 680 on 5S and that is only good got an 11x5. On a 12x10 it was pulling easily 80A. So the Rimfire 480KV may be ok with a 13x10 or 14x10 may just work right. Please buy a wattmeter, always own one. Use XOAR E wooden props, they are sweet.

My DualSky set up was in a WM 40 Super Sports and we are talking UNLIMITED verticals. LOL!
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Old 11-10-2010, 06:58 PM
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Default RE: midwest sukoi to electric

I did an electric conversion on my Midwest Sukhoi 40 last year. I used an AXI 4120, a JETI 70 amp OPTO ESC, two 3s, 3700 mah batteries in series (6S), an 11 x 7 APC prop and a separate receiver battery. The plane flew very well and easily matched the performance of an OS 0.46 FX , except for duration. Flight times are about 5 minutes.
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Old 11-13-2010, 12:47 PM
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Default RE: midwest sukoi to electric

That's good to hear John. I'm currently waiting for my stuff to arrive. Shipment has been delayed for some reason. Looks like flying season is pretty well done now. I'll update when I make progress on this conversion.
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Old 11-16-2010, 09:01 PM
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Default RE: midwest sukoi to electric

My stuff has arrived. Motor has 3 wires, 1 red, 1 black, and 1 yellow. ESC has 3 red wires, A B and C. Which wires to which? Instuction diagram doesn't specify.
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Old 11-16-2010, 09:46 PM
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Default RE: midwest sukoi to electric

It doesn't matter which motor lead plugs into which ESC lead. If after you have assembled the power system in your plane and you're ready to check it out, if the motor runs in the wrong direction when you advance the throttle, switch any two leads and the motor will reverse direction.
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Old 11-16-2010, 10:46 PM
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Default RE: midwest sukoi to electric

Thank You
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Old 11-28-2010, 06:08 PM
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Default RE: midwest sukoi to electric

Had the first flight of the electrified sukoi this afternoon. Here is my setup. Rimfire .55 motor, that's 42-60-480. Turnigy 80A plush ESC. Turnigy 6S 2650mha 30-40C discharge battery. 14-10E prop and all up weight of 4.8 lbs. I checked things with a watt meter before flying. Results: full throttle, 850 watts at 40 amps and 8400 rpm. Not really sure what to look for with this info. Should I change anything. Next battery will be a 6S 3300 mha or there abouts for extra flight time.
The flight was good. allthough it was a little cool out. 20 degrees f with a light breeze. Snow on the ground but our black textile runway was clean. About 4 minites of flight time. Performance was good. Not quite as good as the ys 63 but as good if not better than a .46 two stroke. I'm happy with it. Forgot camera at home.
PS go RIDERS
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Old 11-28-2010, 08:06 PM
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Default RE: midwest sukoi to electric

Looks like you already have a winning combination.
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