Hi,
I will be having my radio which has gone for repairs to the futaba service center, in a weeks time. I would be able to coment on that after then only.

As per the 4 oz weight is conserned I dont see any problem as 46 FX has more power then the 46 LA. Any way lets do experimenting with our engines and props.

I am not bit sure if we can go with 12X5 prop. on the 46 FX.

Thanks

Sharad