ToothFairy 5" Budget Rocket

By tehllama on May 11, 2018

12  401  2

Tooth Fairy - without the precious metals. Target weight of 333g AUW when equipped with an 850mAh 4S battery. This thing is an absolute rocket ship, provided I keep it out of trees. Still a solid race distance performer running 4S 1000mAh and 1300mAh packs depending on the track. Because of the light weight, it survives rough crashes extremely well, so it's a viable racer if your style is not very throttle-heavy.

It's possible to build one of these for $165 catching the right sales, which is absolutely insane for how good this performs. Spedix IS100 stack is the heart of this build, and also why the budget stayed brilliantly on track - RCX 2205 motors, Caddx F1, XM+, and go shred.

The biggest build advice I have is going to M2 20mm through-bolt mounting for the stack, and using 2x5mm silicone tubing (cut to size) as vibration isolating stack spacers. Much more survivable, lighter, and very reasonably priced.

I would recommend moving to newest generation Hyperlite 2205's, and soldering in an AXII Antenna onto the Spedix VTX if you're looking to make this a serious racing build, but those are all really minor adjustments. Similarly, if you can find the IS100 stack base (or want to run the HGLRC F440), the HGLRC or Aomway TX004 are great choices paired with an XSR-E or R-XSR Receiver, allowing you full smart audio control via LUA scripts. If you're trying to hit an insane weight target, going to 2204 motors and sticking with 850mAh batteries makes sense.
The Spedix IS100 DOES require you to solder bridge in four spots if you're using this configuration (run SBUS to Inverted RX1, run 5V to RX Input Voltage, run 5V to the VTX output, and I recommend running VBAT to the camera) - with that all sorted, it's great stuff.

Photos

Discussion

Sign in to comment

Abonacci   Jun 25, 2018  

Hey wondering if you could help me . I'm having major trouble getting signal from my rxsr to recognize in bf on this board. Is rx1 the reciever port on the top picture ? it's not labeled on my board.  And question 2 is if I'm running my vtx/camera off the main wire lead pads and not the supplied plugs, is there still any need to jump those 2 v select pads ? Thanks again !

tehllama   Jun 25, 2018 

That image is off - the RX1 JST 3-pin comes out the 'left' side of the quad - but the first time I wired up my receiver I had the GND and SIGNAL pins backwards - it still powers up, binds, and does telemetry, but doesn't show up to the FC or do LUA scripts right. I'd check if that's the case.
If that is the solution - for posterity's sake, do let me know (here: https://www.rcgroups.com/forums/showthread.php?3048486-Spedix-IS100-AiO-Stack/page4#post39850347 ).
Good luck!

Guides & Reviews

1 803 
24 days ago

The Aomway Commander V2s are the 2018 followup to the successful Aomway Commander V1 FPV headset. Unlike their predecessor, which targeted the FatShark Dominator V3s, the Commander V2s have set their sights higher toward the FatShark HD3s. Instead of 16:9 displays with a 32 degree field of view (FOV) the V2s now sport 4:3 displays with an impressive 45 degree FOV. And unlike the HD3s, these switch..

Read more
2 1,839  8
Aug 21, 2018

The FB 009 is a lightweight and compact budget FPV headset. When I first saw this I thought it might be worth a try. I'm never quite sure which headset to recommend at this price point, so let's see how this stands up. Most notably it includes a USB chargeable 1S 1200mah battery which is a decent capacity for an internal battery. The headset is compact and features a 3" 480x320 16:9 display. The..

Read more