If you’re into RC Helicopter speed competition and have a Henseleit TDR, this is for you, only 30 kit has been made, made by RC Mania in cooperation with Scorpion, super strong Swiss steel shaft and Metal gears, and 3K carbon fiber composite Frames, tested with HK5035 special speed version up to 23KW!!
Including 19,18,17T pinion, you only need a 12MM swash to complete the kit, Gear ratio, 17T 10.2:1 ,18T 9.63:1 ,19T 9.12:1 .
you can see the review at below link
* Review *