CAP 231 (oz13988)


CAP 231 (oz13988) by Mark Sirianni 1994 - plan thumbnail

About this Plan

CAP 231. Radio control sport scale model. Wingspan 72 in, wing area 760 sq in. For .90 2-stroke or 1.20 4-stroke engines.

Quote: "With a .90 - 1.20 for power, this one is sure to please. CAP 231, by Mark Sirianni.

The French Mudry CAP 231 is the hottest new plane on the competition acrobatic circuit. The 231 is a modified CAP 230. It has a section added to the inboard part of the wing at the leading edge and fuselage joint. Unlike the Sukhoi and the Extra 300 that are made of composite materials like carbon fiber, the CAP is basically an old fashioned plywood airplane. It uses a standard 300 hp Lycoming engine. Pilots like the plane because it is easy to maintain and has excellent flight characteristics.

At the 15th World Aerobatic Championships in Yverdon-Les-Bairns, Switzerland, the French pilot Claude Bessiere won first place in his CAP 231 and teammate Patrick Paris took second. This plane is definitely a match for the Sukhoi!

The model cane about because of its good looks and simple design since I had already designed a model of the Extra 300 (oz13986) and a Russian Sukhoi, with the CAP 231 I will have models of the three best acrobatic planes in the world. I originally saw the CAP fly on a TV program about the world of Acrobatic Pilots. After watching the 231 on TV I knew it would make a great model.

The 231 is very similar to the well known CAP 21. The CAP 21 has been around for years and has long been a favorite subject of model builders. The 231 has a few changes over the CAP 21. The wing LE is swept forward near the root, it has a very large wing fillet, and the rudder area is larger. The flight performance is also improved and the color schemes for the 231 are much nicer.

After getting some information and a 3-view from Bob Banka at Scale Model Research, I got started oa my new design.

This plane is an excellent flier but intended for the more experienced pilot. The 231 has a very short nose and a long tail. This can cause some problems with a tail heavy situation, so when building the tail use the lightest wood possible..."

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CAP 231 (oz13988) by Mark Sirianni 1994 - model pic


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CAP 231 (oz13988) by Mark Sirianni 1994 - pic 003.jpg
CAP 231 (oz13988) by Mark Sirianni 1994 - pic 004.jpg
CAP 231 (oz13988) by Mark Sirianni 1994 - pic 005.jpg
CAP 231 (oz13988) by Mark Sirianni 1994 - pic 006.jpg
CAP 231 (oz13988) by Mark Sirianni 1994 - pic 007.jpg

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User comments

Good Day, I've attached a few pictures of the CAP 231 I built from RCM plans on Outerzone [main pic, 005-007]. All balsa and ply construction and covered with Ultracote. Power is a Super Tigre .90. Beautiful Breitling graphics and lettering from Callie Graphics.
For more detailed build information visit:
And for fantastic graphics visit
JohnnyB - 04/12/2023
Beautiful covering and graphics!
Jan Novick - 05/12/2023
Thanks for the compliment Jan. I mentioned it in the article I wrote on the build--the airplane won first place in the club build-off, Masters Class. My first ever with a first!
JohnnyB - 06/12/2023
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