08/11/2026
Today we had a rare opportunity to see a Mudry CAP-10, a two seat training aerobatic airplane. This aircraft is specifically exceptional as it has a steel-tube fuselage compared to most other CAP-10 bodies that were made of wood with a cotton- covered rear fuselage. Developed from the Piel Emeraude two-seat light aircraft, the CAP 10 is intended for use as a training, touring or aerobatic airplane.
The CAP prototype was flown for the first time in 1968, powered by a 190hp injected Lycoming engine, and in the Spring of 1969 was undergoing certification trials at the Centre d'Essair en Vol at Istres in France. Construction is to French AIR 2052 (CAR 3) Category A standards for aerobatic flying. In 1967, they were priced at $30,000 (USD) with no radio or gyros. Total production exceeded 220 aircraft by 1997, and a glider-towing version, the CAP.10R, was available.
With over 300 CAP-10s in more than 20 countries, the design has accumulated in excess of 5,000,000 flight hours. The wooden structure airframe has proven to be a stalwart design that is user-friendly, sturdy and, reliable. For over two decades, the CAP-10, with its side-by-side seating and dual controls, has provided excellent training for military, aeroclubs and private schools.
The CAP-10s continued popularity and outstanding track record allow a continuation of the standard of excellence already in place.
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As for the tail number, the U.S. Civil Aeronautics Administration (CAA) dropped the use of the “X” prefix for experimental aircraft in 1948 American Aviation Historical Society.
Before that, the “X” in a tail number (e.g., NX12345) indicated that the aircraft was registered in the experimental category under the CAA’s classification system. The CAA adopted the “X” for experimental use in 1929 American Aviation Historical Society, but by 1948, it was no longer used in registration numbers. At that time, the CAA also eliminated the C, L, R, and X registration identifiers from official records, replacing them with cockpit placards for airworthiness categories.
After 1948, the “X” could still appear on aircraft if they had an active experimental certificate, but it was no longer part of the official registration number format. Today, the “X” is only used in certain special cases, such as under 14 CFR § 45.22 for certain small, long‑term experimental or amateur‑built aircraft, where it can be displayed on the tail without requiring the “EXPERIMENTAL” placard.