UK Heli Log

Gear mesh on the 700 is very important as the main gear has a 0.7 mod (fine gear mesh normally found on 50 size heli’s). In order to mesh the gears correctly you need to adjust the main gear to pinon gear gap and also auto rotation gear to tail gear gap. This can be achieved by grinding down the nubs on the clutch block and plastic tail case (see photos). In addition you will need to replace the screws with standard non-specialty button head screws and use the specialty washers from the Trex 600. This will need to be done for clutch block, plastic tail case and engine blocks. This will give you enough play to adjust the mesh.

Upgraded Metal Clutch Block with Grounded Metal Nubs

Tail Case with Ground Plastic Nubs

Well I did end up fliying for a brief moment today in between showers, all be it very windy. Turns out my tank is leaking quite badly due to the stupid second stopper in the middle of the tank.

Time for a mod…

I drilled a hole in the stopper and placed a 3mm button head screw and washer. On the inside another washer and nylock nut. I also used an old o-ring from a old 91 carb base and placed it on the outter side of the the stopper. I guess I’ll find out if it works next flight.