Dave Patrick ??
vipul,
re. saito 1.80:
I have one of the first to be produced and they came oput a bit tail heavy which needed to be countered with nose weight. The obvious solution was to mount a heavier more powerful engine. Therefore, I mounted the moki 2.10 to the nose and still needed to mount the 1800 mah NiCad on the engine box in order to hit a conservative first flight CG. On my plane a ys 1.40 would require additional nose weight probably in the form of lead making the airplane even heavier working against the lighter less powerful ys 1.40.
Now the new DP Extra's have the wing mounted more aft making it easier to use lighter engines and hit the recommended CG. It would be interesting to see where the balance is with a saito 1.80 and a small light weight battery pack?
What I'm getting at is that with the new models the saito 1.80 might be sufficient given the potential weight savings?
I would personally go with a larger engine and mount the battery aft to hit the proper CG. But if I already had a saito, I might just try using it first and then change to a larger engine if I was not happy after the first few flights.
Just a few thoughts.
Mike