Running over square.
(edit - everything below makes little sense as my boost guague is not accurate enough for the calculations I was trying to make - ignore).
I am getting mixed messages about running over square on a Rotax 914, Airmaster in flight variable pitch.
To complicate things, I only have a boost and fuel pressure gauge and not an MP gauge.POH (Performance data for variable pitch propeller) says 31 MP for 5,000 rpm, 35 MP for 5,500, 39 MP 5,800 (max 5 minutes).
So firstly, to adhere to the above, do I have the conversion correct?Ambient or resting MP = 29.92 Hg. I have read that boost at rest is 14.7 psi (which show 0 boost on the gauge)1 psi = 2.036Hg
When I go fuel throttle on take off I get about 6 psi which equals 14.7 + 6 = 20.7 * 2.036 -= 42.1452 (seems a bit high)
If I want to achieve 31 MP, 31 / 2.036 = 15.22 - 14.7 = 0.5 psi on boost gauge.
If I want to achieve 34 MP, 35 /2.036 = 17.19-14.7 - 14.7 = 2.49 psi on boost gauge
The above seems awfully complicated and also a bit low on the boost readings.
Notwithstanding that it would be a lot easier to get an MP gauge (but that will take time), do I understand the above correctly?
Is there any easier way?
Tell me what I am getting wrong here.
