HPI Savage Flux XL FLM FTC + CC 1717?

[Nard Cox]

Hi guys,

Currently
HPI Savage Flux
FLM Forward Tranny Conversion
Flux Blur 2200kv diameter : 44mm can and 48mm fins
Gearing : 44/20
Pinion diameter : 21.5mm
LiPo space : 37mm, +4mm (41mm) when I would use the supplied TVP spacers.
LiPo's I run : 4S 5A
RC calc : 34mph/55kmph

Goal
40mph/65kmph

Planning
HPI Savage Flux
FLM Forward Tranny Conversion
CC 1717 HELI 1580kv diameter : 49.5, less on the shaved surfaces Bondo click
Gearing : 44/25
Pinion diameter : 26.5mm
LiPo space: 37mm - (1.5mm/2) + (26.5mm-21.5mm/2) = 38.75mm + 4mm (42.75mm) when I would use the supplied TVP spacers.
LiPo's I plan on running : 5S 4A or 5A
RC calc : 40mph / 65kmph

Questions

1. Am I overlooking something or doing something wrong?
2. Will 5S 4A give me about the same runtime as 4S 5A? (4S * 3.7v * 5000mAh = 74000 vs 5S * 3.7v * 4000mAh = 74000)
3. Will a 5S 4A 40C be sufficient for this animal?

RC Calc data