Had a thought. Maybe someone with knowledge or has flown an H design (insert name here)cough, drone, quad, multirotor. I know about the x design, but the H design is something I can't find much on. I have never flown one. So I can't experiment with one. Is there a distance between the motors that has to be observed when making one? Does anyone have a link that shows actual sizes of the motor layouts so I can try and copy it?
See here is where I am going with this. When I take my Suitcase Deltarotor (thats its new name). I can fold the arms so it represent an H. I was thinking about pinning those into that position and see how it flies. So If the actual quad, when open is 430mm in a circle, Which is 12 inches to 12 inches. If I fold the arms up I can get 16 inches by 10 inches. Could this fly like this? If so I got some wild ideas on what to make next. Maybe ill try it inventor and post on here in a reply. Comments welcomed. Would that picture fly?
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What makes an H design rather than an X is not the distances between motors, nor motor placement. It is the frame : an H design has a central beam linking a front motor boom to a rear motor boom. The weakness of such a central beam (which does not occur with an X frame), is torsion and lack of overall rigidity (flexes).
As said by Graham in previous post, this causes a counter yaw effect , if you use the same motor spinning directions as for a classic X frame. Therefore it is advised to select a specific H frame motor spin config, that will cancel this adverse effect out (I believe it exists in mission planner when you install a new firmware)
It will fly no problem. I used something similar with my Foam H-quad: http://diydrones.com/profiles/blogs/epp-foam-folding-h-frame-quad - it was longer longitudinally than laterally.
H-frame uses different prop rotation direction due to the adverse twist in the arms caused when using the X config on a H-frame, this twist in the H-frame arms causes an opposing force to the turning force (torque) that quads use to yaw, making the yaw action less effective.
sure it can fly, aspect ratio between length/width is up to you , this is handled by having different PID's for roll/pitch directions.