5" C-Punk Racer sub 250g

By Rotorenpilot on Feb 09, 2024

9  0  13

Big shout out to EyeFly from Germany, great design. I originally emailed them for a Vista version of the original, but while building quickly decided to make a few of these, as it's just a very versatile base.

To be super light and also to enhance the "racer" concept I thought a "quick and dirty" analog build with a fun canopy would be just perfect as a "test proof of concept".

I still want to build the Vista, and maybe even remix this concept for a more durable freestyle version, but for now I'm really enjoying the look of this one.

Thank you to Mark Kotlowski for the cool canopy design.

So I just gave it a hover and one of the first things I added after was an expo on the throttle to lower..or better, to soften the thrust. It was intense to say the least, will add some video later.

With regards to weight: weighing in at 141 grams, and flying pretty snappy with a 3S battery, staying comfortably under 200grams. With a 4S 850mAh or even 930mAh it's a bit heavier, but still a good bit under 250grams.

I did not find a great spot for the capacitor, so I'll add a little bracket to protect it soon... I've had some issues with capacitors breaking off in the past to say the least.



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lalith   8 days ago  

please could you share dvr

Rotorenpilot   8 days ago 

yes, I'll post something, it's just been raining like crazy over here and I also have a dayjob, but if all works out, I should be able to put something up this week

kathy23   9 days ago  

I don't know how to thank you for this post.Really, I'm very pleased by this post. Whoever wrote it was a great person.Thanks for telling us about this.Thank you for being ready to share what you know with us. quordle today

Rotorenpilot   8 days ago 

Happy to hear you like it, I'm also working on a freestyle version of similar design. Probably another re-mix of one of Nic's concepts from Eyefly

lalith   9 days ago  

bro i am a beginner will you recommend me this frame for racing and if yes please could you share 3d printed parts files and dimension of tubs for this build and is there any other to contact you or talk with you please

Rotorenpilot   8 days ago 

Hi, no problem. To be honest, I've only been in the hobby since fall last year, so I'm not in any way a "long term authority" on the subject, just an avid builder with a humble background in electrical engineering.

Now with regards to your questions:
I'm not a racer, but from what I've seen on YouTube (Alex Vanover, Min ChanKim and the likes), this build seems to check all the boxes. Let me explain
--> easy to replicate, due to low frame cost - check
--> super stiff and rigid - check
--> very light and responsive - check
--> true X geometry - check
--> also it's analog

I tried this with a 3S and 3 inch props, since I didn't have 5 inch t-mounts when I finished building and it was already so powerful I put an expo on my throttle to be able to sort of "tame" the thrust ratio.

To me it's a pretty good candidate for racing, but again, I'm not an expert.

With regards to 3D prints --> everything is in the description, with the exception of the capacitor protector I re-mixed, and they are all on thingieverse.

For private messaging you are welcome to use rotorbuilds messaging service and if need be we can figure something out in addition.

lalith   9 days ago  
Rice_Bowl   15 days ago  

great to see tube designs getting more light. I hope someday we can get injection molded parts tbh as that would but the cherry on top as these 3d printed parts are usually what breaks or what increases weight. But damn those frames from eyefly look great!

Felias - eyefly   18 days ago  

So great to see your build on here, thanks for sharing! Looking great with the canopy :-) Also thanks for the shoutout!
Would be very interested in your longterm experiences with the LANNRC motors. I hear they break quite easily sadly in a crash - thats why i mainly use them for my LongRange-builds - that i don't crash just as often .-)

Show 2 more comments
Rotorenpilot   17 days ago 

Yes, those long range projects on your page are pretty cool. I love the forest video of that one (I think the deadcat design).

The one (I call it the hourglass, I think you refer to it as "open box") frame I would like to try next is this one shown here https://www.eyeflydesigns.com/#tubwidex
(tubular wide X..?). It looks symmetrical and perfect for freestyle, not sure about the rigidity, but if it's anything close to the full box design, it'll be great. I think it's either 4 inch, or 6 inch... I'm thinking the 4 inch version might be more fun for freestyle with the lighter motors.

Felias - eyefly   16 days ago 

Yes, this version is indeed great for freestyle. The only downside is that it takes a bit longer to build the base frame compared to the TrueX-version i've built after - so in case of damage to the frame switching them out takes a little longer. To further improve on this, i've built the "Wide-X box" series - there you have all your electronics on a standalone cage that you can easily switch over to a new core frame. However i agree that the hourglass-style frame looks nicer :-)

Anyway, for the hourglass "WideX" version i do have a 4", 5", 6" design ready. I've just uploaded the 4" version for you here: https://www.thingiverse.com/thing:6481335

Rotorenpilot   16 days ago 

Thank you, I'm looking forward to this one, and as usual --> I'll post the build when it's done

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