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Old Oct 11, 2014, 11:00 PM
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godspeed2's Avatar
United States, IL, Chicago
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fox electric glider motor help

I have a fms fox electric glider 91" wing span foam. I am looking for a suitable motor . My plane fully loaded weigh in at 2lb and 28oz. I would like a motor that will have more than enough for this plane. Im not in a area where I can get much thermals and Im looking for vertical climbing. Thanks guys. I will be adding fpv gear to the plane soon as well.
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Old Oct 14, 2014, 03:13 PM
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You didn't say how you ended up with no motor.... So I can tell you the stock motor that comes with the plane. It's a Brushless 4018-KV900 .

If you wanted something other than that, I can't help you.
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Old Oct 14, 2014, 10:34 PM
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You have to address all elements of the power system, not just a motor, to get the performance you want. That means prop size, battery voltage and capacity, esc rating and finally motor Kv and size.
If you want to work with an existing prop or batteries or esc, you need to specify these. Maximum motor size and weight will also be useful.
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Old Oct 15, 2014, 12:09 AM
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Ok, sry. I brought the plane as a kit. no motor no servos.
the plane weighs 2lbs and 28oz. with a 3s 5000mah battery and 60a yep speed controller.
only thing missing is the motor and prop.
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Old Oct 15, 2014, 06:03 AM
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I'm not sure I can help with this one - mainly because motors I can think of are unlikely to be mountable without significant mods to the airframe - it has a unusual (for a glider) rear mounting setup http://www.motionrc.com/fms-fox-glid...p/#spare-parts. Also from a bit of reading it seems a challenge to balance with 3S 2200, let alone 3s 5000

There are several threads around on this and what appears to be the same thing sold by Hobby King http://www.rcgroups.com/forums/showt...fox+epo+glider
http://www.rcgroups.com/forums/showthread.php?t=2079041

It seems closer to 3lb is realistic weight. Around 500W in to at least a 130g motor with a decent size prop will provide the thrust for vertical or near vertical climb.
on 3S, use Kv around 800 for 14x9.5, 900 for 13x7" prop, around 1100 for 12x6".
Note that just using a bigger prop on the stock motor will not be successful - it's not designed to handle 400-500W.

Good luck with your goal - I think it might be a big challenge with this model
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Old Dec 15, 2014, 02:36 PM
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Chile, Valparaiso, Viņa
Joined Dec 2007
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Quote:
Originally Posted by godspeed2 View Post
Ok, sry. I brought the plane as a kit. no motor no servos.
the plane weighs 2lbs and 28oz. with a 3s 5000mah battery and 60a yep speed controller.
only thing missing is the motor and prop.
I bought mine as an PNP and the motor that came from the factory was bad... replaced it with the following:

http://www.hobbyking.com/hobbyking/s...ner_900kv.html

Hope this helps.
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Old Dec 16, 2014, 07:20 AM
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godspeed1, jecchile is right. The DT900 is the correct motor for this plane. I have a couple of these planes. HK has them for around $11USD and I have purchased and used this motor with good results. It should mount with no modifications. Also consider the 4023 which is new.

http://www.hobbyking.com/hobbyking/s...dproduct=56986

The 4023 is 1000Kv, 500 watts and rated at 1200g thrust. I am planning to try this one out myself. It seems to be a bit more powerful but I am not sure about its combination with a 12x6 prop in terms of heat and efficiency.

Good luck
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Old Dec 16, 2014, 07:30 AM
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BTW: My plane runs about 1700g all up weight with 2 1300 3s cells in parallel stacked in the rearmost compartment. Its a CG consideration. That is without the FPV pod. I recommend getting the FPV gear as close to the CG as possible. My avatar pic is the FPV pod mounted on the FOX glider. This is a fairly short range ship for me due to limitation of the batt weight and CG. I am no expert but let me know if I can help any further.
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Old Dec 16, 2014, 09:17 AM
The Fixer
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Quote:
Originally Posted by kevin8092 View Post
BTW: My plane runs about 1700g all up weight with 2 1300 3s cells in parallel stacked in the rearmost compartment. Its a CG consideration. That is without the FPV pod. I recommend getting the FPV gear as close to the CG as possible. My avatar pic is the FPV pod mounted on the FOX glider. This is a fairly short range ship for me due to limitation of the batt weight and CG. I am no expert but let me know if I can help any further.
Do you have any more pictures of a build log to look at Kevin?
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Old Dec 19, 2014, 10:29 PM
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@ Martin

Here are 11 somewhat random pictures taken on the long and rambling build of the FPV pod. As you will see the setup "evolved" over time, it works well enough but is to heavy. The Storm OSD did not make the cut but I subbed in Hitec's sensor pack. This only turned out to be a short range ship. I have several of these FOX kits and I put the VTX and the RX antenna on opposite wingtips of the next kit build. That gave me 64" of distance between the 2 with the GPS midway between them. That does improve the CG issue a lot and I can stack 2 1300 bats for more flying time. That build does feature EZOSD/UHF however that ship has not flown yet.
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Old Dec 20, 2014, 09:52 AM
The Fixer
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Thanks Kevin
Great looking build. Did you have to use any dead weight in the tail to get CG?
Wanted to get one of these but no longer available from HK . Decided to go with a Windrider version.
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Old Dec 20, 2014, 10:04 AM
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WOW! KEVIN8092... that is some kind of setup... I am amazed that the bird flies with a 1300mah battery. (At least that is what I saw in the pictures)

BTW, I love your workshop... wish I had the room to have one like that - hihihi.
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Old Dec 20, 2014, 11:27 AM
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Thanks guys,

Martin - MotionRC carries the newest version of this plane, a full house version. If you ever reconsider it. http://www.motionrc.com/fms-fox-glid...-wingspan-pnp/

I have used up to 20g of lead shout in the tail, It prolly could go a bit more.

I do like the FOX airframe regardless of how well the foam versions work out as a FPV ship. I very much like your FOX build Martin, it is most awesome. Eventually I think I would like to get the FlyFly 3M FOX. I am building their ASK-21 cadet version now and have the 3M GROB sitting in a box in the closet. That will be FPV for sure. Is the FF FOX airframe something you would recommend ?
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Last edited by kevin8092; Dec 20, 2014 at 11:57 AM. Reason: correct typo / add pics
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Old Dec 20, 2014, 04:13 PM
The Fixer
Canada, ON, Mississauga
Joined Jan 2009
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Thanks Kevin,
I looked at the motionRC one but the shipping is nuts for me. I looked into just a set of wings but with the shipping came out to $120 for a $50 pair of wings.
The fkyfly Fox is nice, lots of room for everything, little heavy. From the videos on it, it flys fast. I'd like to get that ask-21 myself. Had the hk foam of it. You will lke it.
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