PISTACHIO SCALE:
Open to any scale free flight rubber powered model of either not more than 8" span or not more than 6" overall length excluding propeller. The minimum documentation is as follows: (a) A general arrangement drawing of at least two inches wingspan but not more than twelve inches wingspan.

There is a vague mention of multiple wings here: https://www.hippocketaeronautics.com/ff_in_bostonian.htm
Quote:

I looked at the plans for the StaggerWink bostonian and it is 3" x 16" for each wing. I think that the multi-wing aircraft have their minimum weight doubled though for contests. I designed and built a bostonian triplane some years ago. Not for any contest, but just to try out the design.
ian

Bostonian Model Rules
Here's a PDF of the AMA Bostonian rules for indoor Free Flight (always capitalized) model airplanes.

Here's the first five rules on the list:

1)Maximum projected wingspan shall not exceed
16 inches (40.64 centimetres).
2) Maximum wing chord (measured parallel to he
direction of flight) shall not exceed three (3) inches (7.62 centimetres).
3) The diameter of the propeller(s) shall not exceed six (6) inches (15.24 centimetres).
4) The length of the model excluding the propeller(s), but including the thrust bearing(s),
shall not exceed 14 inches (35.56 centimetres).
This measurement will be made in the direction of flight and, will include surfaces, which extend beyond the thrust bearing or fuselage end because of a sweep or unusual mounting.
5) The fuselage structure must include a box, which has minimum dimensions of 1.5 inches x 2.5 inches x 3.0 inches (3.81 centimetres x 6.35 centimetres x 7.62 centimetres). The width (the horizontal dimension perpendicular to the line of flight) of the fuselage shall not exceed three inches (7.62 centimetres). The box must be enclosed within the fuselage structure and must be covered so as to restrict free air movement through the box. Normal sag of the framework between supports caused by the tension of the covering will not be considered as a violation of this rule.

For the full rules click on the PDF below.

Found this on the net regarding some books published on model airplanes: Published in the U.S. by Anderson Publications, 1998. Volume 1 (1907-1935)Dawn of American Aeormodeling, Volume 2(1935-1941)The Boom Years, Volume 3((1941-1949)War and Evolution and Volume 4(1949-1965) Transition.)I think it's probably a pretty good ballpark range of Golden Age Model Aircraft.
Tom

Stagger wing is a great looking aircraft.  I look forward to following your build in the current builds board.

Stuart wrote on Aug 19^th, 2019 at 10:13am:

Double covering I believe is referring to covering both the top and bottom of the wings and stabs unless noted otherwise on the plan.   Some models like NoCals just have one surface covered like the tops of the wings with no covering on the bottom of the wings.  Some indoor models are similar.  But the referrence you've noted is the Dime Scale rules which are models that have very simple construction but represent real aircraft.  Unless the real aircraft was covered only on the upper surfaces...then both surfaces require covering.  In regards to markings (national insignias, numbers etc.) If the plans only gave enough markings for the topside then that would be all that was required for competitions.  Remember these rules are for those who want to compete in "Flying Aces Club...'FAC'" competitions.

I meet up with Rich Weber and other fellow free flight models on Saturday morning for build sections. Great guy.
Paul

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Tom