Turbine Rocket Saucer. This spinning saucer features 8 slightly canted and 4 highly canted 24mm mounts. I am in awe of Boris' work.
BTW, I received this issue about a month later than expected. I've subscribed to Sport Rocketry for many years and, for the first time, my original issue never appeared. After three weeks, I emailed NAR HQ using the address provided on their website. Marie got back to me within a week and the replacement arrived less than a week later. If you have problems with your membership, don't hesitate to contact them. Their staff is small so you may see delays due to illness, vacation, holidays, etc.. However, be patient and they will take care of you.