i am thinking about getting a tojeiro 50 pattern plane .

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Technical specifications:
Wingspan: 52.17" (1325mm)
Length: 55.12" (1400mm)
Wing area: 596.75 sq in (38.5dm²)
Weight: 4.85 lbs (2.2kg)
Engine: 2C .40-.46 size
4C .52 size
Glow engine

do you think an o.s fx 46 has the thrust needed for this model?
do you think its a good idea to fit an fx 61 up front?
is the fx 50 that much stronger that it wiil make a difference over the fx 46 ?

amstaff, looking at the specs, my opinion is that a .61 is too much engine. You may want to search RCUniverse for "tojeiro" and see what others are using.