I stand corrected on my earlier estimate of 120 sq. in. as the disc area. The original full-size plans show a saucer diameter of 12-1/8". This gives a disc area of 115.5 sq. in.
Robert, if you look at my Invader photos, you will indeed see that "Spaceman Spiff" and his trusty sidekick Hobbs are at the controls of this menacing space machine, seemingly having abandoned their usual cardboard box!
Tim. Does she stunt? You bet
; but build the model with the optional large-size elevator shown on the plans.
The only fault with the design is if you use a tank-mounted engine, the model will come out naturally nose heavy. I had to put quite a bit of lead weight in the tail to get the model to balance as shown on the plans. But once there, the OK Cub will pull it through loops, lazy eights etc. I have recently installed a Cox Black Widow and the one flight I had on it indicates that it should be able to do most stunts.
If I built another one for a tank-mounted engine, I would move the firewall back by the tank dimension. This would give a better balance without the added weight in the tail; should even fly better.
Another caution: I had mine catch a gust and free-flight over my head
to the other side of the circle. I had added some weight to the outboard of the disc but without rudder or engine offset, she may want to come in on you at times. I mostly cured this by putting in about 2 degrees of engine offset; 3 might even be better.
Orv.