I'm involved with a British version of the American weightlifting comp, which latter is run by the SAE.

In seven years of competition, we have never had a biplane entry owing to the comparatively poor aerodynamics.

However, we have found the trike to be a far superior animal to the conventional u/c, especially as the weight piles on. However, don't fit a spindly bit of piano wire and hope that this will do the trick. You need to engineer the nose-leg or you will find that it collapses and/or renders the model impossible to control on the ground.

BTW, there have been quite a few full-sized aircraft with tricycle gear, I think , especially in the microlight world. Once you become accustomed to the aesthetics, you'll find that they look fine.

Springer