Rob's Hangar

I just opened the 2801Pro from my 4G6 (great little helicopter) because i didn’t like the trottle stick tension. Tension was too strong and i dont like the snapping.

To get rid of the snapping i carefully sanded down the little plasic teeth inside the throttle stick mechanics. A very small amount of grease on the plasic and the metal locking-part makes the throttle stick movement even smoother.

I wanted to be able to adjust the tension screw without opening the Tx casing, so i drilled a 4mm hole into the back of the Tx.

Walkera 2801 Pro throttle stick tension adjustment mod

Another thing to do would be to replace the bushings with bearings like Spektrum on the DX7. Heres a great how-to for the bearing mod on the Spektrum DX7 – should work pretty much the same way on the 2801.

Before I start: This mod really does make a huge difference. It will make the 4#3B helicopter responsive like never before, self stabilizing and not rolling in any other direction than your stick input. See my videos here.

But only if the flybar angle is set exactly to 45°. If its not, you will end up with the same performance as in the known Bell/Hiller Mod or the other available b/h mods with the original 90° flybar. However with this mod the flybar angle can be set. I’m working on an improvement in how to set the angle exactly AND have it stay that way (thinking liquid metal, loctite, epoxy, bigger screw…) Maybe someone will come up with the perfect solution.

Bell Head on the Walkera 4#3B

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Mod made from stock parts. The flybar angle can be set between exactly to any angle around 45° (+/- 10°). The result is pretty much what the Walkera CB100 will be like.

With this mod, the left-rolling problem of the well known 4#3B Bell/Hiller mod is eliminated because phasing can be set exactly. More about parts and how-to later.

UPDATE: scroll down for a 10 seconds hands free hover video.

i just made some outdoor video with an onboard 5.9 Gramm Spycam board. Total weight of the 4#3B with video is about 62 gramms. Around 4-5 mins of flight time. it feels a bit heavy.

i used a 4GB 20$ Spycam that comes as a pen. removed the “pen” and used only the PCB/Board. Its fun. i need to get the camera angle more upwards – a little bit to much grass in the vids, but some people to.

where to get the cam, just google spycam pen, amazon, ebay, you can get them anywhere.

The camera needs to be cut, the pcb taken out, the camera lipo needs to be removed and powerd by the heli lipo. and the sensor-chip needs to be brought to an 90° angle.