I would be surprised if the EC135 "beats the pants off" the A109S but willing to compare real world figures as opposed to marketing bumpf.
As an indication in the UK there are 28 corporately operated A109E/S/SP versus 7 EC135s so I would guess that would give you a clue to the more capable machine for corporate transport.
Wombat, as a comparison, can you calculate the performance of an EC135 for FTF’s request:
To keep it simple how far could both fly, and how quickly, with 30 minutes reserve?
1 pilot at 90kgs
5 pax at 90kgs
30kgs of luggage
Class 1 from an elevated heliport (such as Battersea) ISA conditions.
For one of our Grands:
3175kg MTOW Class 1 Elevated Helipad
Aircraft empty weight 2186kg
Less 570 for Crew, Pax and luggage
Leaves 419 kg for fuel.
Take 100kg off for the 30 minute reserve leaves 319kg which will keep you flying for an 1hr27 mins at 150 knots and therefore give you a range of 217nm.
So in answer to FTF’s question the Grand will go 217nm in 1hr27 minutes with 1+5 pax with luggage.
FTF if you need a cofg calculator for the Grand or Power please send me a PM.
Oh and you do have to buy a kneepad to hold your chart and it really could do with altitude acquire mode (standard in the SP) but otherwise the autopilot is pretty good.
Bilbo