The MOAB is probably the best known Western interpretation of the Grid Fin, but the Soyuz stole the concept from the N1, which makes perfect sense given Russia's penchant for continuing to use a technique thats proven to work. (The grid Fin NOT the N1) 8)
Grid Fins are used to change course, given their lack of torque when required to alter a missile/rockets course.
So, heres the million dollar - or 2 cent question - your choice...
Do you plan to build and test a design with Grid fins, using them in a regular - on axis configuration - instead of using them in their proper setup as control fins?
I ask because about 8 years ago, the Scale freak came out in me and though my current work is on a high detail project - W.A.S.P., I've been studying these fins and have discovered they can be a fantastic alternative to traditional fin designs. No, I've not boilerplated a design yet, but have some links I can provide with more data for your perusal.
The following pdfs give a detailed subsonic study on these fins, and perhaps will raise more questions, but they are a fantastic read:
https://www.fluent.com/solutions/articles/ja136.pdf
https://www.zju.edu.cn/jzus/2005/A0507/A050722.pdf
This pdf is the most detailed, but also has great info.
https://handle.dtic.mil/100.2/ADA383925
I'm still searching for a document entitled "Grid Fins - A new concept for missile stability and control", by W. D. Washington, U.S. Army Missile Command, Redstone Arsenal, Alabama. It was presented at the 31st Aerospace Sciences Meeting & Exhibit. Jan. 11-14, 1993.
It is directly referenced in a current patent approved in 1997 entitled:
"Aerodynamic lifting and control surface and control system using same" by Ralph H. Klestadt. The full text of his patent can be found here:
https://www.patentstorm.us/patents/5642867-fulltext.html
Free membership is required to view the images included in the patent, but essentially Mr. Klestadt's patent is for an aerodynamic lifting and control surface comprising a wrapped grid fin for use with an aerodynamic vehicle. His idea will allow the fins to fold around the body of the vehicle to provide for a compact storage arrangement. (A little more research shows that Mr. Washington received a patent for a similar design some 7 years previous to Mr. Klestadt.)
I digress....
The problem that these fins have when used - as discovered after research at Eglin AFB in Florida, is they can cause excessive drag at Transonic speeds. So, while these would be a seemingly acceptable change from the normal fin on lower powered flights, I'd be hesitant to accept them as a clear choice on HP flights that are designed for high altitude attempts.
More research to follow and once I get moved into the new house, I can start boilerplating some models to test this idea.
Cheers,