Update notes on the use of the Alfa fan & Hacker motor with 301

The Alfa Mega fan version (Alfa fan 1502 Mk 2 Mega) has a 28mm wide engine housing designed for the mega motor. However, the Hacker at 20mm will fit this unit. The screws line up and all that happens is that there is a gap between motor and housing which is of no consequence. Hence this version is more versatile because both motor options (Hacker & Mega) can be used. The Alfa fan Mega version comes with 3.2 mm shaft adapter

It is also correct the Alfa fan 1502 Mk 2 version for the 300 motor can be used with the Hacker ( but not Mega motor) and comes with 2.0mm adapter.

In either case, the aluminium adapter has to be modified to match the 2.3 mm Hacker shaft.

There are two ways of doing this (we have tried both methods).

a) Machine the 2.0 mm adapter out to 2.3 mm with a drill press. This takes great care and can be difficult because any misalignment of the drill and one can not balance the rotor.

b) Perhaps the better option is to 'sleeve' the hacker 2.3 motor shaft with some K & B brass tube (which is commonly available) and use the 3.2 mm aluminium adapter. The aluminium adapter is machined and tapped to allow a 2 mm grub screw in the side to hold motor shaft and sleeve in place. This is the far easier option and works very well. Lockite is applied

So in summary, if you have the 3.2 adapter then use it. If you have the 1502 MK 2 (Mega version) then use this. If not, 1502 Mk 2 version (20mm housing is also ok for the Hacker). With the sleeved option we have had the motor running on 5s (yes 5s!)

Ian.