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 Post subject: Gas to elec. on a 71" AJ Slick?
PostPosted: Tue Dec 08, 2015 7:19 pm 
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Joined: Tue Oct 04, 2011 9:31 am
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Location: Stanfield Oregon 97875
I have a 71" AJ Slick with a DLE 30CC gasser in it now. I'm thinking of converting it over to electric, preferably to run off 6s 5000's or 3300's that I already have for my heli's and would like to know what motor esc combo's would be recommended?

Any idea's about this motor from HK? http://www.hobbyking.com/hobbyking/store/__18125__Turnigy_Aerodrive_SK3_5055_430kv_Brushless_Outrunner_Motor.html
and maybe the YEP 120 HV in case I ever decide to go to 8s?
I already have a few YGE and YEP ESC's that I've had great luck with and have the prog card already.

Just looking for something fairly reasonable, I know the Motrofly or Hacker motors would be much better. But realistically I only fly my planes maybe 10 or 15 flights a year so I'm not really needing the longest lasting items out there just looking for something to get about the same performance or better out of the plane that the DLE 30cc has now.

I seen that James used that HK motor in his plane, (I think it was that one anyway) I have a Turnigy motor in another smaller plane and it has been great so far but like I mentioned I've probably only flown it 10 times.

Thanks for any tips or info.


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 Post subject: Re: Gas to elec. on a 71" AJ Slick?
PostPosted: Wed Dec 09, 2015 8:33 pm 
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Joined: Sun Jul 31, 2011 3:43 pm
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Location: Houston, Texas
Hi Chris

Sorry for the slow reply

I use the same motor on my 68 inch 3DHS Velox and it flies great on 6s 5000, i run it with an 18x8 prop and dont pull that many amps at all.
Its fairly safe system on that prop.

I used to have a 20cc DLE in it and i would say there is more smooth power from this motor.

Not sure how it would compare to a 30cc.
It may do better for you on a 18x10 or a 20 inch prop....

Chris flew my plane recently at a fun fly and seem to be pretty happy with the way it flew.
Hopefully he will chime in with is opinion as well.

I also used the YEP 120HV and then put it into a 700 size heli where i am pretty sure it shut down on me so i havent used it since.
I stuck a borrowed 100amp Castle in the Velox and it doesnt break a sweat.

Cheers

Ben

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 Post subject: Re: Gas to elec. on a 71" AJ Slick?
PostPosted: Thu Dec 10, 2015 8:20 am 
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Location: Austin, TX
That motor is definitely adequate for a 20cc size plane, but might be a little weak in a 30cc size.

James burned his up using it in a 30cc plane, but I think he was running it on 8S at the time. I believe he has since picked up a different (Hacker maybe?) motor that he caught on sale.

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 Post subject: Re: Gas to elec. on a 71" AJ Slick?
PostPosted: Thu Dec 10, 2015 9:34 am 
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Location: Stanfield Oregon 97875
Well I just ended up ordering the Tacon 110 Bigfoot motor http://www.hobbypartz.com/96m607-bigfoot110-5325-295kv.html?gclid=Cj0KEQiA4qSzBRCq1-iLhZ6Vsc0BEiQA1qt-znEmZzAKsGmrG1cUDCtdFVu-MZOwuCBtfjQDEPC3rWEaAnZ08P8HAQ

I've heard some pretty good things about it on 8s. I plan on ordering some 4s 4000mah batteries and running it on 8s with a 120HV esc.
I also just ordered the ZTW Gecko 120A HV from Altitude Hobbies but after reading some more about that controller I may cancel the order and just go with a Hobby Wing or YEP. Been hearing some not so great things about the Gecko 120. I do have a smaller 80A, I think, Gecko in my 60" Laser running 6s that works good though.

As for props, what are your favorite elec props to use in these larger sizes?
I really love the Falcon props on the gasser engines.


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 Post subject: Re: Gas to elec. on a 71" AJ Slick?
PostPosted: Thu Dec 10, 2015 12:55 pm 
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Location: Austin, TX
Cool, let us know how that motor works out!

I've heard good things about Falcon props, but I haven't ried them. I have a Xoar PJN prop on my electrified Kaos, and it works very well.

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 Post subject: Re: Gas to elec. on a 71" AJ Slick?
PostPosted: Sun Jan 03, 2016 4:30 pm 
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Location: Stanfield Oregon 97875
So I got the Tacon motor in the 71" Slick ready to go. Just waiting on the weather now.
Before I put it in the plane I did some prop, and Esc testing. I mounted it on my bench engine tester and got out the watt meter.

I used both the ZTW Gecko 120A HV as well as the YEP 120 HV esc's. There seemed to be very little difference in the watts and amps used for each prop tested with each speed controller. I did have some screeching going on with the YEP when I advanced the throttle too fast but I think I can adjust that out with the YGE prog card. I just did a quick setup to get the esc working with the motor and probably haven't found the correct timing, start up speed, or other settings yet.
I had good luck with the ZTW despite what some have mentioned on other forums. I also have a ZTW esc on my 60" EF Laser that so far is working good with the Torque motor in it.

I then mounted the original DLE 30cc engine with the Pitts style muffler on the bench and did the same test with the same props. Minus the watt meter :lol:

Here are the results I got.

The Turnigy batteries were brand new, these were the first cycles on them. I know, I know, not exactly how you should break in batteries. But I am very impatient and totally bored going nuts waiting for better flying weather.

The numbers all came from full throttle of course.

Tacon Bigfoot 110 5325-295 KV motor
4s Turnigy 4000mAh 40C Lipo packs running in series for 8s.
ZTW Gecko 120A HV ESC

PROP-----------RPM / AMPS / WATTS

Falcon 20x8------------------6900 / 112.6 / 3137
Top Flite power point 20x8----7050 / 100.9 / 2816
Xoar 20x6--------------------7380 / 94.1 / 2686
Xoar 19x8 painted------------7650 / 102 / 3089
Xoar 19x8 laminated----------7550 / 98.8 / 2994
Top Flite power point 18x12---7400 / 99.8 / 2956
Top Flite Super M 18x8------- 7850 / 80 / 2355
Top Flite power point 18x6----8070 / 74.3 / 2265
Zinger 18x6-10---------------7650 / 94.7 / 2863


DLE 30 cc gasoline with B.C.M. pitts style muffler. Same exact props. 22 degree weather. 800 ft. above sea level. Reg. non-eth. Gas with Pennzoil 50:1 mixture.

PROP---------------------------RPM
Falcon 20x8---------------------6510
Top Flite power point 20x8-------6120
Xoar 20x6-----------------------7200
Xoar 19x8 painted---------------6930
Xoar 19x8 laminated-------------7110
Top Flite power point 18x12------6780
Top Flite Super M 18x8-----------7950
Top Flite power point 18x6-------8550
Zinger 18x6-10------------------7290
Mejzlik carbon fiber 18x6---------9120



Tacon 110 Bigfoot motor specs.

Model #: 96M607-Bigfoot-110-295Kv
Weight: 480g
Input Watts: 2000W
Outside Diameter 62.8mm
Length 54mm
No. of cells (Lipo) 14
Max Efficiency 93%
Max Efficiency current 68
No Load Current(A) 7.4V 1.2
Internal Resistance: .0.041 ohms
Shaft Diameter 8 mm
Shaft Length 20 mm
KV (RPM/Volt) 295KV
Turns (for cars) Poles 9
Max Voltage 55
Wire Size 0.25
Bullet Connectors Yes
Bullet Connectors Size 4.0 mm

So based on what the specs of the motor are. Will I be pushing it by running the motor over 68 amps with 19 or 20 inch props if only for short bursts during typical 3D and lazy sport flying?

I also have 6s packs that I could run in either series or parallel but I haven't tried running the numbers on 6s or 12s with these props yet.
Maybe I'll give that a shot for shits and grins just to see what happens unless all you people with much more sense than I have don't think it would work too well.
Am I right in thinking that the kv of the motor really isn't optimal for 6 or 12s?

Anyway just thought I'd share what I came up with. 8-)


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 Post subject: Re: Gas to elec. on a 71" AJ Slick?
PostPosted: Sun Jan 03, 2016 8:33 pm 
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Location: Austin, TX
I dunno, that looks pretty good on 8S. 12S would be a no-go, and the KV seems a bit low for 6S. I'd say give it a shot. Make sure you have good cooling, and just keep an eye on the temps as the weather warms up.

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 Post subject: Re: Gas to elec. on a 71" AJ Slick?
PostPosted: Tue Jan 19, 2016 10:59 am 
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Joined: Tue Oct 04, 2011 9:31 am
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Location: Stanfield Oregon 97875
Well I remaidened the 71 inch Slick with the Tacon 110 Bigfoot motor and 8s 4000's. WOW!!! Much more power than the DLE 30cc which wasn't lacking by any means.

Very happy with the electric conversion although it looks like I'll only be getting around 4.5 to 5 minute flight times with the 19/8 Xoar props.
It was around 50 degrees here when I flew it and the motor, esc, and batteries came down very cool. Hardly any warmth at all so it should be a pretty good setup. Hovers at between a quarter and half throttle I'd guess although I really wasn't paying attention to the stick position when I was flying it too much.
Definitely has way more power than you need for this size plane.

It now weighs around 11.1 pounds rtf, with the DLE it was around 10.5 if I remember right but it flies so good you don't notice the added weight at all.


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 Post subject: Re: Gas to elec. on a 71" AJ Slick?
PostPosted: Tue Jan 19, 2016 2:24 pm 
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Awesome! Thanks for the flight report, it is always good to have "known working" configurations to refer to. :)

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 Post subject: Re: Gas to elec. on a 71" AJ Slick?
PostPosted: Thu Mar 03, 2016 4:10 am 
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Posts: 23
Location: Tooting
nice conversion and build.


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