Have read thrust line on these planes s/b approx. 3 deg up & 3 deg right. Don't know about Ace Seamaster but on Neptune next to no adjustability here. Ques is this, what reference line is used when measuring t/l? With bottom of hull level current t/l is a little up; with wings and horiz stab level current t/l is slightly down. Any advice will be much appreciated.

Anyone? Need some advice.

I did have the seamaster years ago, and built it just as the plans say. Now I do not know if the plans are the same or not.

well done guy, look really proyect ending, I´m finished my amphibian too, but nobody know about CG engine axis of pusher.
know how to take off this bird ??.

best regard

I might be having the same issue with my neptune.  When I put it together, I simply  mounted the engine to the firewall and away I went.  Plane flys great!!! once its off the water..my question is how do you add the up up thrust?  Ive heard adding washers to the motor mount will change the T/L.   Maybe this is why mine takes forever to get into the are.  It gets up onto step quick, but just gets pinned there for about 100 feet