Why a manual system if the automatic HAC works so well?
The simple answer is the supply well has gone dry. There is a good demand for mixture control we’ve come to know as HAC (High Altitude Compensation) Once upon a time, the automatic HAC chambers were used in the snow industry then later in Ultralights, but that’s going back almost 15 years. Demand on the snow side has dwindled in favor of more modern technologies. The HAC chamber, as marketed to the UL industry never really caught on as packaged and priced through Rotax. Over the last three years, it has gained in popularity because of promotional effort by Olenik Aviation, and Green Sky Adventures, Inc.and the fact that the kit was reconfigured to exclude expensive, unnecessary components. A production run of certain HAC chamber parts requires quantity commitments that are quite high. This has been an ongoing issue for the last couple of years. Remember, the UL industry, compared to motorcycles, watercraft, and snowmobiles, is extremely tiny. So, while UL demand has been increasing, th
