This document is an instruction manual for an engine, emphasizing the importance of reading the safety instructions and warnings before operating the engine. It also suggests familiarizing oneself with the controls and other features of the engine. The manual provides guidance on installation and adjustment, as well as maintenance and troubleshooting advice.
This document is the instruction manual for the O.S. 91HZ-R, a factory-tuned internal combustion engine developed expressly for F3C model helicopter flights. It features an integrated Demand Regulator System (DRS) to ensure steady fuel supply during vigorous attitude changes and includes a new 61F carburetor with twin needles for independent mixture adjustment.
| Application | F3C flights |
|---|---|
| Carburetor Type | 61F with twin needles |
| Fuel Requirement | At least 18% lubricant by volume |
| Nitromethane Content | 10% to 30% |
This engine was designed specifically for model helicopters and should not be used for any other purpose.
The twin needles on the 61F carburetor allow for independent adjustment of the idling/hovering and high speed mixture.