I just couldn't contain  myself again.   Both designs are great.   Depends on how you set them up.   

Well, since I have a Mauler kit already, guess what my choice is.
Lee TGD

Jim, I built the Guardian and the plans work fine. I built it without the flaps and I believe that was a mistake. It took a very hard landing and I cracked the wing so it is now a hanger queen. It was Rossi RISE 60 10CC engine equiped and one of the nicest carrier planes I built.
Wayne

Bill, I have one you can have. Its got a small repaired edge but its ok. I came upon this original blue print  plan from my flying buddy Dave Heinzman. He didnt need it anymore. This is a copy of the original blueprint done by a blueprint house so there is no distortion like a copying machine. I contacted Bill Boss and received this e-mail in return and that explains a lot. The Sea Fury got published in May 76 but the Guardian didnt. Its interesting that Bill Boss didnt think that the Sea Fury was a very good flying airplane. The print is folded so let me know where to send it.
Wayne

OK, it's down to the Robert's Mauler or the Boss Guardian.  Which is the better performer?

Thanks,
Jim

Jim,

With the same power the Guardian will out score the Mauler. The Mauler is a wonderful model but it carries too much wing in comparison to the Guardian. Top speed rules the day. The Mauler might be able to be slowed down a bit more than the Guardian but that won't help the score enough. The Guardians I flew "in the day" were stable, predictable models. And, as you pointed out, they were designed for the job. Actually, the guys at Grumman could not have done a better job making an airplane just for us.

There are three good Class II Guardians available. The Boss design, Sterling kit and one by Bill Johnson. The Johnson design is available from AMA Plans Service. There are others but these are the best.

Jim, I just this year built and flew a Sterling 36" clone for Class 1. I used a front intake gray case Torp 40 with an OS 4BK carb. BTW there were two K&B 40's one with a larger intake that will take a tiny shim for the 4BK. The other is smaller and used a Perry carb. Flew nicely so a nice light friendly plan bearing RC 60 might do the job. Thinking like maybe an OS FP 60 R/C or a K&B 60 sportster.
Wayne

Jim, I dont have any experience with any of those. I would just bench test all of them. Use a 10/8 and see what they will turn up and also idle. Weigh them in. The Rossi RIRE might be my last choice as that is a high performance motor that is heavy. Also see if there are any performance numbers or tests. You need something that will accelarate and unwind quickly.
Wayne