A smaller version was fitted to Nos. 1400-1414 during building.

Several versions were fitted with different engines and some had noticeable performance differences.

Introduced in 1981, the standard version is fitted with a conventional wood walnut stock.

In Japan a smaller two-litre version of this engine was fitted.

This experimental version was fitted with a M-34 engine.

Long-range version, fitted with an extra fuel tank; two built.

While plans were prepared for more powerful versions fitted with revised wings, no production ensued.

Flat version (bored to 82 mm) was fitted to the 512BB.

All versions may be fitted with a suppressor and are meant to use Uzi magazines.

Model 249: Experimental version fitted with four rotor blades.