Some Lego spaceships have handles attached, made out of Technic beam and pegs, and attached to the model using Technic bricks, pegs, and axles.
For example, 7644: MX-81 Hypersonic Operations Aircraft has a handle on the top (circled below), and the shuttle in 7690: MB-01 Eagle Command Base has a small handle on the bottom side.
This handle is great for play, transport, and mounting, and I'd like to incorporate this feature into my own designs. However, I don't know what a safe number of pegs and beams is relative to the weight of the model. To be really useful, it needs to support not just the weight of the model, but a reasonable amount of centrifugal force caused by rapid course adjustments as it flies around my living room. Are there official Lego Group guidelines on this, or has someone done a study of the strength of peg-and-beam constructions?