Home » News » FlightClub Neutron Prototype : FPV Race Frame

FlightClub Neutron Prototype : FPV Race Frame

FlightClub Neutron Prototype : FPV Race Frame

You might be wondering, why is this PROton so small?  Well, that’s because it’s not a PROton.  This is the FlightClub Neutron.  The Neutron is basically a slightly smaller and slightly lighter PROton that’s designed specifically for the smaller 20×20 components.

It’s got all the features you love from the PROton, just shrunk down.

flightclub neutron fpv race frame


* This is the v1 prototype so some things might change

  • CNC 7075 Aluminum Nucleus plate with threaded holes for the motor screws
  • Butter mount – will have custom butter mounts for M3 and M2 screws
  • at least 4.5mm arms
  • 5″ is about 210mm
  • Skeleton or Hybrid canopy.  The pod is designed by MayDay FPV
  • Skeleton plate has a slot for the PROton GoPro mount
  • Will have different arm options 5″ 22xx, 5″ 14xx, 4″ 14xx and 5″ SX
  • Goal is to get the weight around 60g.  currently about 65g

It still features the nucleus plate with threaded holes for the arms.  This will eliminate additional nuts needed to hold the arm screws and makes arm swaps a breeze.

flightclub neutron fpv race frame

Yes it has the butter mount also.  If you aren’t familiar with the butter mount, it’s a way of mounting the flight controller stack I invented that completely isolates the flight controller from any vibrations.  These custom butter mount grommets prevents any hard surfaces from the frame to touch the flight controller screws.  Since some 20×20 stacks use 3mm holes and some use 2mm holes, there will be a new custom butter mount grommet that will let you use the 2mm hole components.

It will have countersunk holes like the PROton for a completely flat bottom.


Just like the PROton there will be many arm options for the neutron.  There will be a 5″ 22xx motor pattern  and stretch X version later.  I’ve had a lot of people wanting arms for the smaller 14xx or 15xx motors so I made it for the Neutron.

This Neutron has the 5″ 14xx motor pattern holes with the Brotherhobby 1507 2800kv.  It’s using the HGLRC F440 40A BLHeli32 3-5s F4 stack.  The build weight of this one is about 175g and can use 5″ props.  4″ with 5s would be fun on this setup!

The Neutron v1 prototype weights around 65g, around 15g lighter than the PROton 5″ race.  It doesn’t sound like a lot but when you factor in the weight savings of using 20×20 components it comes out to around 30g less than an exact build but using 30×30 components.

These two quads are using the exact parts except for the stack.  The PROton, on the left, is using the RaceFlight Bolt32 with RevoltOSD and weighs 282g.  The Neutron is using a 20×20 RaceFlight Spark v2 ESC with MillivoltOSD flight controller and weighs 248g.  The difference in weight is 34g.  That’s like flying around with 1 less motor.

PROton vs Neutron


The Skeleton top plate (Neutron left, PROton right) will still have the slot for the GoPro mount.

The Neutron Nucleus plate (left) still has the threaded holes and butter mount.  It’s 2.5mm vs 3mm on the PROton.  Both are still milled out of 7075 aluminum.  I’m testing if 2.5mm is thick enough for the CNC plate.  Don’t worry, I know what you are thinking…”what if I strip the threads?”  Of all the PROtons out there, we haven’t heard of a single Nucleus plate with stripped threads.

Even though the PROton can use 20x20mm components, because of the placement of the arms, the rear two holes of the 20×20 holes need to use the arm screws.

So does this mean the Neutron is replacing the PROton?  No, I don’t think so.  Even though it’s smaller and lighter, 20×20 electronics are still pretty new.  PROton will still be the flagship race frame.  It’s about having options and having the right tool for the job.

This is the v1 Neutron prototype so there’s a lot of testing that needs to be done.  I’ve got v2 arms that are thinner, lighter and 5mm arms coming too.

Will you be adding a Neutron to your fleet?  Let me know your thoughts in the comments below.

By | 2018-04-13T21:07:24+00:00 April 13th, 2018|News|31 Comments


  1. Jim D 04/13/2018 at 4:06 pm - Reply

    Where can I get that Axii mount for my PROton?

    • Mike Tseng 04/13/2018 at 6:11 pm - Reply

      that’s a new one i’ve been trying out and it’s been working great. i’ll put them in the store next week. i have it for the PROton too

  2. Bradley J. 04/13/2018 at 5:11 pm - Reply

    I’ll take one in 4 inch. Cant wait.

    • Mike Tseng 04/13/2018 at 6:12 pm - Reply

      thanks! i’m about to try a 4″ 5s next week. should be fun

  3. Azmi Wiggins 04/13/2018 at 5:44 pm - Reply

    I will definitely be getting a neutron I tried to fit a 20×20 aio and found it really hard plus 2 of the screws were not butter mounted so the neutron will solve this as well as being lighter and smaller! So Mike do it bro !!

    • Mike Tseng 04/13/2018 at 6:13 pm - Reply

      yeah i understand. you’ll love this neutron. it feels a lot smaller than the proton

  4. MojoPapi FPV 04/13/2018 at 7:05 pm - Reply

    Please no weird hardware like the chameleon. Std M3 screws only and 5mm arms. Thx!

    • Mike Tseng 04/13/2018 at 9:02 pm - Reply

      yeah everything will be M3 unless you are using a stack that uses m2 holes. i have 5mm arms coming

  5. Greg Lightbourn 04/13/2018 at 7:41 pm - Reply

    I love my PROton frame but can you make a GoPro Session Mount that the camera is inserted from the side instead of the back?

  6. Eduardo Esparra 04/13/2018 at 9:00 pm - Reply

    Mike, I’m in 100% for this one for sure! It looks freakn awsm! I can’t wait to build!

  7. Tracy T 04/14/2018 at 9:26 am - Reply

    AWESOME Mike!! You continued to elevate the game! Looking forward to the final version.

    • Mike Tseng 04/14/2018 at 10:51 am - Reply

      thanks Tracy!

  8. JB 04/14/2018 at 7:53 pm - Reply

    This looks like the perfect frame. ETA?

    • Mike Tseng 04/15/2018 at 3:32 pm - Reply

      thanks! probably late may or june

  9. Dr.Kwad 04/15/2018 at 1:58 am - Reply

    I’m in for two one 15xx stretch and a 22xx. Any idea on availability?

    • Mike Tseng 04/15/2018 at 3:32 pm - Reply

      thanks! probably late may or june

  10. Lokeni Siuta 04/15/2018 at 2:22 am - Reply

    I want one now lol

  11. Damien Krohse 04/15/2018 at 12:58 pm - Reply

    It looks very nice, I’ll be watching for this.

  12. AL Villalobos 04/15/2018 at 9:07 pm - Reply

    Yes I will once I learn how to fly my PROton. Love the options Mike…. Keep up the great work.

  13. Jose Domingo 04/16/2018 at 3:10 pm - Reply

    Hello, I’m interested in one 4”, I have one proton skeleton and I’m loving It

    • Mike Tseng 04/16/2018 at 6:39 pm - Reply

      i’ve got them in 4″ coming!

  14. Adam 04/17/2018 at 11:24 am - Reply

    Still seems heavy for 4 inch Mike, my 4 inch are mostly about 40g frames including metal and 3D printed. For 5 inch looking at light props even in the 2800kv, 2 blade 5040 glass nylon or carbon nylon work well on 4s with cobra 1407 3200kv, rotorgeeks 2800 and even 3200, 850mah pushes the flight time for a race at high throttle, but 1050mah should get you there.

    • Mike Tseng 04/17/2018 at 3:56 pm - Reply

      these are really 5″ racers that can do 4″. these scream on 5″

  15. SignoEleven 04/17/2018 at 1:34 pm - Reply

    Awww man! I just finished 3 Proton builds. Now I gotta get me some Neutrons too? Haha. The fleet is getting bigger every day! I am not sure about the v1 AXII mount you have pictured. I really like the v2 AXII mount on the Proton. Nice work on the new frame, Mike. Keep em coming.

    It’s too bad you couldn’t make the Neutron and Proton arms exactly the same. I would love the ability to just have 1 set of arms for both the frames.

  16. Jeffrey Gustin 04/17/2018 at 10:17 pm - Reply

    Do you know if the Neutron will fit a spark 32 esc mike?

    • Mike Tseng 04/17/2018 at 11:15 pm - Reply

      right now no, i’m really debating if I wanna design for those gigantic “20×20” stacks. those escs are about the size of full size 6s 4in1’s with 20×20 mount holes. why not just go with a full size quad?

      • Jeffrey Gustin 04/22/2018 at 9:44 am - Reply

        I think it would be helpful to use a 60g frame for a 6s build lighter componets can help with the hevey battery…. that’s the only reason I asked about the spark32… it’s prob just the back stand offs keeping it from fitting I’m guessing?

        • Mike Tseng 04/22/2018 at 12:49 pm - Reply

          yeah, that spark32 is not really a 20×20. that thing is bigger than a standard 30×30 esc. the issue is if I make the neutron fit those huge 20×20 stacks it will be the size of a proton almost

          • Jeffrey Gustin 04/22/2018 at 8:05 pm

            i got you bro.. i guess HGLRC Makes a 40 Amp ESC…

  17. Albert Villalobos 04/21/2018 at 2:15 pm - Reply

    I would love to see a 3″ practice version for around the neighborhood with 5mm arms.

    • Mike Tseng 04/21/2018 at 9:31 pm - Reply

      interesting. i’ll look into it

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