Concept E-CX5 Electric F5K Glider Review

Let's see what this F5K E-CX5 can do! It's a 1.5M electric sailplane from Concept and it can use your CX5 DLG wings!

Splash

Introduction

I've been hearing more and more about F5K and when Concept released an electric fuselage for the CX5, I was immediately excited to try it out. I got one on order along with the new CX5 Pro fuselage which I do an article on later, but I got the electric fuse and parts in and wanted to share my thoughts and experience with it. I haven't flown an F5K competition yet, but I'm looking forward to being able to do that as the new format grows.

Video

Assembly

There wasn't a lot to do here since I am using one my CX5 wings. I just needed to get the fuselage setup with the electronics. I used the 3D printed servo/ballast tray from Rollo, KST X08H servos, an 1806 2300kv motor and a Castle Creations Talon 15 ESC along with some 2S ~400mAH lipo batteries. Here are some photos and text showing the install.

Flying

It flys just like a CX5! All the same handling characteristics, speed and penetration you know and love is still there. The main difference is the vertical stab is taller and a different shape from the hand launch version. The E-CX5 has an even tighter turning radius which means you can core small low level thermals easier. Flying weight on mine came out to 290g and it flys great at that weight. With the option to add ballast, it can handle just about any condition you'll encounter.

I'm still working on the power system. The 6x4 prop and a 2S 300maH lipo on the 1806 2300KV motor is enough power to climb out and fly on, but it's not powerful enough for my liking. I changed the prop to a 7x4 and that helped out a lot. I think I will stick with this motor and run a 3S lipo when it's windy and a 2S lipo in calmer conditions. I'm excited to go fly an F5K competition now. I can also see myself taking this with me on vacations to visit slope sites as I like having the ability to power up and save the plane if the wind dies. I'll have my E-CX5 in Florida at the end of April for the USA Team Selects so be sure to stop by my tent and check it out.

Photos

Conclusion

The bottom line here is the E-CX5 flys every bit as good as the hand launch model with all of the same great handling and aero benefits of the CX5 wing design. The quality of the fuselage, fit and finish are all top notch. It's going to be a very competitive plane in F5K competitions and a perfect companion for those low launchers out there to fly mixed launch F3K at smaller regional events that allow it. Soaring USA carries these now along with the F3K CX5 and both versions are available for $999. Go get you one!

Check out the Concept CX5 F5K at Soaring USA

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Last edited by Jason Cole; Apr 20, 2021 at 07:41 AM..
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Apr 20, 2021, 09:47 AM
Yes..ok..maybe..lol.....
Hi Jason,
What brand of spinner and folding prop are you using for the E-CX-5

-dave
Apr 20, 2021, 09:51 AM
RCG Admin
Jason Cole's Avatar
Thread OP
It's the CN 25MM F5K Spinner and CN Slim Carbon blades.
Apr 20, 2021, 12:01 PM
ThomasLee's Avatar
Jason, before swapping out the motor I'd recommend trying a 20A - 30A ESC first. That motor/prop should give take you well over the 60/70m launch heights in the 7 seconds.
Apr 20, 2021, 12:05 PM
RCG Admin
Jason Cole's Avatar
Thread OP
It’s not being limited by the ESC currently. I think it’s really just right for non ballasted on 2S and 3S when the wind picks up. Should be plenty, but I’ll have a better idea after we actually have a competition.
Apr 20, 2021, 12:22 PM
ThomasLee's Avatar
Awesome!
Looking forward to seeing more F5K or mixed events in the US! Sweet model
Apr 20, 2021, 01:40 PM
Registered User
Very cool!! Looking forward to seeing it in a few weeks.
May 22, 2021, 05:44 AM
Registered User
Alan W's Avatar
FlyBoone !! .. neither you nor your enthusiasm for flight have diminished in 20 yrs - Love your reviews.

200-300mah 2s ? like the 2s UMX chicklets ?

Alan W
SEFLI Member / NEAT Fair Grunt Worker
May 22, 2021, 06:17 AM
RCG Admin
Jason Cole's Avatar
Thread OP
Thanks Alan! Yeah Iím using these Betaflight 300mah packs.
Jun 07, 2021, 10:49 AM
Registered User
DaveG's Avatar
Nice review, Jason. Are you still going with the DYS 1806 2300kv motor with the 7x4 prop? I’m looking at using a DYS BE 1806 2300kv. I’m new to the drone-type motors, did your 1806 come with a prop collet that is threaded 5mm for the spinner?
Jun 07, 2021, 11:24 AM
RCG Admin
Jason Cole's Avatar
Thread OP
I’m still using the same motor with the larger prop and it’s enough. 3s would be perfect really for windier conditions. No the motor comes with a smaller adaptor, but I had 5mm one on hand that worked with it. .
Jun 07, 2021, 02:56 PM
Registered User
DaveG's Avatar
Great! Yes, that’s what I’m thinking, too, is going with a 3s setup for windy conditions. Thanks so much for the info and here’s to happy flying!
Jun 10, 2021, 02:14 PM
Registered User
Dan Richardson's Avatar
Jason, What did you end up using for your Flight Mode settings and max throws? Dan
Jun 10, 2021, 02:26 PM
RCG Admin
Jason Cole's Avatar
Thread OP
Dan, I don't have those numbers handy. I used the same setup as on my F3K planes for the main flight modes, speed, cruise and thermal.
Jun 10, 2021, 02:28 PM
Registered User
Dan Richardson's Avatar
Quote:
Originally Posted by Jason Cole
Dan, I don't have those numbers handy. I used the same setup as on my F3K planes for the main flight modes, speed, cruise and thermal.
No worries, will be starting out with the non electric CX5 settings and go from there. Nice review!


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