[Graeme Smith]

Here are some snapshots of the gearbox that will fit on the lower shaft of the secondary, replacing the lower bearing as that bearing is part of the gearbox. The gearbox is slid up the lower secondary shaft and secured in place via the existing 1/4" bolt (the bolt that fixed the tr belt pulley to it.), The gearbox runs spiral bevel gears at an angle so the tail rotor drive shaft will go down the middle of the boom. There are 2 intermediate inline bearing mounted to an aluminium plate that bolls to the bulkhead that carry the swing arms for the belt drive system. This gearbox has an oil pump on its bottom that circulates oil that is passed through an external oil filter. I have more information on my "Rotorway Mods & Upgrades - Australia 
https://www.facebook.com/groups/1523964747814153

[Graeme Smith]

I thought I would post where we are with the tail rotor upgrade, nearly there, some cooling fins to add, oil level sight glass to add, filler / breather cap to add, chip detector to add and a few other incidentals changes as we refine the design, but it is looking good. (the RW hub is just for appearance sake as the buyer will use his / her own RW hub and blades etc.
With this design I have the option of being able to slightly rotate the T/R attach cone on the boom so the tail rotor can have an upward thrust as well as a sideways thrust, this will, I Hope go some way to reducing the need for the ballast weight as there can be an upward thrust on the boom making it more level in a hover, this will need to be tested. I will be spinning the tail rotor itself slightly higher rpm as well so a little more thrust as well.

[Jared Hartzell]

This is looking great @Graeme Smith! Have you considered doing anything about the TR blade grips/pitch horns being held in by snap rings? I recall there being an incident with a TR blade flying off after maintenance due to potentially incorrect installation of the snap ring. While unrelated, it was just a thought that came up. Seems to me that is an area that should be addressed at some point as well.

[Graeme Smith]

This is looking great @Graeme Smith! Have you considered doing anything about the TR blade grips/pitch horns being held in by snap rings? I recall there being an incident with a TR blade flying off after maintenance due to potentially incorrect installation of the snap ring. While unrelated, it was just a thought that came up. Seems to me that is an area that should be addressed at some point as well.

Hi Jared, simple answer no, I have enough on my plate ATM, and the reason I am doing this is to replace the tail rotor belts as they destroyed my last build, and I thought why not, the shaft drive at its slightly higher RPM = more thrust, no tail rotor belt adjustments and maybe an answer to the ballast???
making the shaft to suit the existing RW T/R pitch horns makes my current life a little easier and cheaper.