I found the Nimbus 550 a very suitable donor in scale conversions from 550 to...

I found the Nimbus 550 a very suitable donor in scale conversions from 550 to 700. Because it's using belts it also makes for a very smooth running heli. It's not as expensive as SAB because of its single-stage reduction gear but is very high-quality nonetheless. Its modular side frame makes it a great candidate for dog house installation. It has a decent motor ratio of 10.6 to 1 using a 10T MOD 1 slanted pinion and stock adjustable motor mount. And all-new from Ra a 12T tail pulley to bring tail to head ratio to 5 to 1. Last fall I installed one stretched to 580 in my old Fun-key AStar using a Goblin 570 tail belt (yes same GT3 x6mm as SAB). It shares the 27mm diameter tail boom from the Specter V1 so anything between 550 and 700 is fair game. Because, unlike Align, its main shaft is plain 10mm, longer main shafts are easy to cut at minimal costs. I installed the new tail pulley this week and it's RFT. Just waiting for warmer temps for a test flight. I flew it first in December and loved it. New this year is 12s with Aureus 105 and Egodrift 4030HT-400kV from you pick your own kv Beta series.