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UnscrupulousModefiler

Member Since 18 Jun 2015
Offline Last Active Apr 15 2020 05:44 AM

Topics I've Started

Ideal air-flow characteristics for a 6-shot absolver?

27 August 2018 - 10:04 PM

Hi gang. Looking to make the tiniest 6-shot absolver shells possible (without resorting to 3D-printing just yet...), so wanting to understand things a bit better. I've read a whole bunch of posts here on how people have made theirs but it seems there's very little discussion of the physics of ideal airflow regarding absolvers specifically. There's heaps of info on how to best to get one dart to fire at a time (pretty straight-forward that...), but things get squirrelly once you split that air-flow and present it to multiple darts. Is there a discussion out there somewhere that might be relevant or am I just stuck with trial and error?

Relevant issues/things to try to address in the build:

  • Minimising dead-space and smoothing air-flow. (Obviously the less dead-space the better, but how important is flow at this scale, especially when it comes to the flow through the expansion/splitting chamber? I can easily fit a cone-shape to the end of the "seventh" tube in the centre of the chamber, but would the shape of the rest of the chamber affect dart velocities much? )
  • Expansion-chamber - volume and relative dimensions. (Is small best here or do you want the compressed air to expand a bit to achieve some sort of "velocity" before hitting the backs of the darts? Is there some sort of ideal relative distance between the rear of the expansion-chamber and the back of the darts to allow the air some elbow room to work on the them? Should the darts be packed right down to the expansion chamber (to reduce dead-space), or would having a bit of extra room in each tube behind the dart better focus the pressure?)
  • Barrel Material, Length and Tightness. Starting with 16mm OD electrical conduit (ideal ID for Elites etc). Strating experimental length will be = (length of one dart) + (diameter of one dart). The extra length here will be reamed out in the middle of the bundle and then capped to create the expansion chamber (so a six-lobbed cylinder three conduit-diameters across by about 12.5mm high)
  • Air Tank: I've got a BBBB and Lanard Big Salvo to play with. Salvo tanks would be ideal for overall compactness, but then there's an individual trigger/pilot valve to sort for each of them. Will initially be running a small 12v compressor with a pressure-switch to fill the tank but ideally want to transition to a SpeXBZ and HPA.

All this may be moot at this tiny scale... but any pointers gratefully recieved!


Rayven "Flip Clip" Extended Battery-Tray Cover

24 November 2017 - 02:26 PM

For those that missed it on Reddit, here's my attempt at an extended battery-tray cover for the Rayven using an N-Strike Flip Clip. Apologies if someone's done it all before!

 

View Imgur gallery here: https://imgur.com/ga...y/evkvX#f8ZUQvu

 

Attached File  DSC03599.jpg   288.63KB   58 downloads

 

The little 2S Lipo that I'm using was in a prior life powering 2 x FK180-3539's in an RC helicopter so should be rated to their continuous current demands. Short-term they've powered the Rapnadomolisher on full-auto... I'm just not so sure how they'd deal long-term with full stall current (approx. 15 amp each) so I'm limiting their use to lower-spec'd semi-auto builds. Here it's just powering stock motors, wheels and cage for family-friendly "Stock+" games. Rayven's mag-alignment and trigger pull sorted, 16AWG rewire and 16 Amp microswitch, volt-meter and kill-switch added plus a XT60 connector for swapping in a different cage - so it can be taken back up to super-stock when needed.

 

The Devcon ended up not taking onto the original black plastic cover so I resorted to small screws (recovered from the stripped RC chopper). If you look very closely in image #30 you can just see where the screws are finding purchase in the Flip Clip (into the outer trianglular depressions) without having to drill through the plastic entirely.

Note: the same completed extension will also fit exactly onto a Demolisher battery-tray cover (and adhere better because ABS).

 

1. T-Series T-11 RC Helicopter - Stripped for parts

Attached File  1. T-Series T-11 RC Helicopter - Parts.jpg   389.45KB   61 downloads

 

2. T-11's 18500 2S battery pack in Rayven

Attached File  2. T-11's 18500 2S battery pack in Rayven.jpg   378.82KB   59 downloads

 

3. Battery tray cleared and wired for XT60

Attached File  3. Battery tray cleared.jpg   353.81KB   60 downloads

 

4. Battery tray cover won't close

Attached File  4. Battery tray cover won't close though....jpg   339.93KB   60 downloads

 

5. Enter the N-Strike Flip Clip

Attached File  5. Enter the N-Strike Flip Clip.jpg   377.33KB   57 downloads

 

6. N-Strike Flip Clip (rear). There's a screw cover you need to pop off then you can unscrew and separate the halves.

Attached File  6. N-Strike Flip Clip (rear).jpg   360.67KB   59 downloads

 

7. Trim flanges to fit into vice

Attached File  7. Trim flanges to fit into vice.jpg   330.48KB   59 downloads

 

8. Hacksaw while in vice

Attached File  8. Hacksaw while in vice.jpg   399.54KB   56 downloads

 

9. Saw off all rear webs and bosses

Attached File  9. Saw off all rear webs and bosses.jpg   376.63KB   61 downloads

 

10. Jeweller's Saw to remove middle

Attached File  10. Jeweller's Saw to remove middle.jpg   351.66KB   60 downloads

 

11. Sawn

Attached File  11. Sawn.jpg   367.21KB   60 downloads

 

12. File up to these centre webs

Attached File  12. File up to these centre webs.jpg   365.94KB   59 downloads

 

13. Using a flat block to square edge

Attached File  13. Using a flat block to square edge.jpg   381.07KB   57 downloads

 

14. Join is flush and even on block

Attached File  14. Join is flush and even on block.jpg   362.83KB   60 downloads

 

15. Sits nicely on Rayven's battery cover

Attached File  15. Sits nicely on Rayven's battery cover..jpg   335.25KB   59 downloads

 

16. Devcon cherry busted...

Attached File  16. Devcon cherry busted....jpg   403.45KB   59 downloads

 

17. Mixing up with black concrete-colouring

Attached File  17. Mixing up with black concrete-colouring.jpg   361.18KB   59 downloads

 

18. Texturing join for better adhesion

Attached File  18. Texturing join for better adhesion.jpg   372.73KB   58 downloads

 

19. Lying flat on table edge

Attached File  19. Lying flat on table edge.jpg   321.32KB   57 downloads

 

20. Clamping flat

Attached File  20. Clamping flat.jpg   347.79KB   60 downloads

 

21. Peeling off excess glue while tacky

Attached File  21. Peeling off excess glue while tacky.jpg   353.67KB   60 downloads

 

22. Devcon didn't bond (D'oh!) so went with small screws also recovered from the RC chopper (see image 30)

Attached File  22. Devcon didn't bond, so went with screws.jpg   347.42KB   58 downloads

 

23. Trying on Rayven shell

Attached File  23. Trying on Rayven.jpg   403.7KB   60 downloads

 

24. Looking good

Attached File  24. Looking good.jpg   386.85KB   58 downloads

 

25. Decent height giving good depth extension. Nice bevel detail.

Attached File  25. Decent height nice bevel.jpg   338.35KB   60 downloads

 

26. Scribing cutout lines parallel to edge

Attached File  26. Scribing for cutout lines parallel to edge.jpg   369.45KB   59 downloads

 

27. Drill corners, then jeweller's saw

Attached File  27. Drill corners, then jeweller's saw.jpg   365.97KB   58 downloads

 

28. Checking battery for fit

Attached File  28. Checking battery for fit.jpg   366.53KB   57 downloads

 

29. Square and bevel edges

Attached File  29. Square and bevel edges.jpg   373.22KB   55 downloads

 

30. Snip off excess web material. If you look very closely here you can just see where the screws are finding purchase in the Flip Clip (into the outer triangular depressions) without having to drill through the plastic entirely.

Attached File  30. Snip off excess web material.jpg   371.05KB   61 downloads

 

31. Thin foam to stop rattling

Attached File  31. Thin foam to stop rattling.jpg   374.07KB   59 downloads

 

32. Tuck under edges

Attached File  32. Tuck under edges.jpg   378.17KB   55 downloads

 

33. Inside done

Attached File  33. Inside done.jpg   353.42KB   59 downloads

 

34. Sand off logos with 180-grit. Ideally, to completely flatten large areas like this you'd go face-down onto a full sheet of Wet and Dry on something DEAD flat like a ~10mm thick plate of glass. A nice tightly-wrapped sanding stick does the job fine though.

Attached File  34. Sand off logos with 180-grit.jpg   369.77KB   60 downloads

 

35. Finish with 600 grit Wet and Dry

Attached File  35. Finish with 600 grit Wet and Dry.jpg   362.42KB   56 downloads

 

36. Finished item fitted to Rayven

Attached File  36. Finished item fitted to Rayven.jpg   374.3KB   61 downloads


The 'Rapnadomolisher' - SSTS/RS/Demolisher Integration

22 March 2016 - 06:56 AM

Base integration here is a 'RaptorStrike' (Nerf Rapidstrike reshelled in a Supersoaker Tornadostrike body), with an additional integrated Demolisher Launcher.

 

This is very much a Work In Progress. Shell-work is NOT complete and a proper battery and volt-meter are yet to be fitted, but the basic wiring's done and it's firing now.

 

Attached File  DSC00992.jpg   76.07KB   93 downloads

 

Attached File  DSC00991.jpg   92.74KB   89 downloads

 

Attached File  DSC01037.jpg   381.86KB   92 downloads

 

Attached File  DSC00970.jpg   116.68KB   87 downloads

 

Attached File  DSC01054.jpg   142.23KB   88 downloads

 

Quick video of state of build here. Apologies for the potato-quality, but this is just a quick intro before I finish the body and do the paintwork.

 

2nd test firing on 9.6v here.


* RS shell and dart-carriage ultra-minimised to fit inside TS shell. (RS is a bit fat in the arse around the pusher-assembly while the TS tapers there, so RS had to poke through the sides).
* Jam-door area opened up.
* RS front iron sight attached.
* Rayven fly-wheel-trigger serving as the mag-release switch inside the trigger-guard.
* TS pump-grip fully integrated into the Demolisher grip.
* Barrel is a 5" cut-down Recon barrel-extension. Straight-rifled bore, plus it has a handy central locating tab to align and secure the barrel inside the TS shell. Original RS barrel-extension lug attached at business end.
* Blaster with stock retracted is now same length as a RS , or with stock removed same as a Rayven .
* Motor covers and tac-rail rescued from the RS shell and monstered onto RHS of TS shell to cover the larger motors.
* RS triggers installed with 16amp microswitches and 18g wire.
* Scavenged and matched 3 x FK180-3539E motors from several RC helicopters, so pusher is a 180 too now.
* I accidentally cut off the pusher-motor control switch's attachment points while separating the trigger assembly so using MakeTestBattle's wiring-loom pattern to eliminate this switch from the circuit, with the addition of a kill-swich.

 

 

Thanks for checking it out!