Wayne, really,
you think you know something about this high wing twin warbird building of planes no one else would think about building,, pffttt,,
Now a real challange would be to build something like oh, a 109 stunter,, THAT would be hard,,,, * to finish anyway*
Thanks Mark.
I'm just pointing out that for the most part this stuff isn't nearly as difficult as many always seem to want to think. The biggest problem I that always notice is people "overthinking" a lot of what the basics are in C/L, and then overcomplicating things as a result. When in doubt, always remember the K.I.S.S. rule. Heck, all I did with the front/rear leadout position on the PBY when I did the initial pre-flight bench trimming is hang the completed RTF model from the leadouts and then adjusted the model for a very slight nose out position. Other than for height (explained later here) I haven't ever moved them since.
The Bronco could
easily be designed and built as a very capable Stunter. Sit and look at a side view of the plane and then imagine the airfoil centerline in relation to the center of mass of where everything like the engines, tank, control system etc. would be mounted in the completed model. While designing the model on paper, mounting points for all of those things can be adjusted slightly toward or away from the airfoil centerline as desired. But, even in true scale, on the Bronco the bulk of those items aren't that far off of what that desired (airfoil) centerline would be anyway. The Bronco just fakes you out into thinking all of these things are way off just because of it's overall appearance. Weightwise, things are hardly any different on the Bronco than on a "normal" airplane. The only thing that is really that much different on the Bronco is the stab/elevator height in relation to the wing. That, as some have pointed out, could easily be "cheated" while still maintaining a very good scale outline.
For thought and comparison, in the case of the PBY the engines, wing and stab/elevator are all on the same line. The only thing of significant weight away from the airfoil centerline is the heavy trike landing gear. All I really had to do then was end up with the leadout exit lined up happily with the vertical CG. I literally "eyeballed" and estimated this position when I did the original design and planning of the model. Knowing that I would never nail it exactly is why I made the vertically adjustable leadout guide. When all was said and done, I missed the ideal height position by about 3/8" of an inch and my original guide didn't have quite enough vertical adjustment in it. When this was discovered I made a new slider for the guide, finalized the adjustment, and haven't touched it since.
While designing, just focus on alignments of flying surfaces and CG points and draw them in where they need to be. Then final key is really just down to getting the leadout position right. The model doesn't have eyes, it doesn't know what shape it is.
Now Mark, what about this 109?! Better just get it finished and flying, it is gaining weight as we speak through wood petrification!!!