Temperature of airbox, Rpm's
in 912iS Technical Questions
9 years ago
Hi everyone, I am new to this site and also to the 912is sport engine and I have learned so much on here from all you guys. Rotax dealers, engineers and manuals are ok but are limited in some of the sound practical knowledge and experience of you builder/pilots. Please excuse my ignorance at times but this computer controlled engine does my head in at times no matter how many times i read the manual. I am test flying an aircraft (Lsa) with a fixed pitch prop at a density altitude of between 2-3000ft and have a couple of questions: Q1 after a flight when the top cowl is taken off the black airbox with 'ROTAX' written on it is so hot you can fry an egg on it, you can not rest your hand on there. How hot should it be allowed to get? (prob a cowling issue) Q2 I have a static Rpm of 5300 but decreases down to 5000 rpm at lift off. Is this an intake issue that i somehow have a different value at 45kts? Q3 what do most of you guys use as a minimum static Rpm (fixed pitch) assuming sea level ISA conditions. The manual says 5800 for 5 mins etc, should we decrease the prop pitch to attain 5800? Thanks, no doubt i will have many more questions.
