level in flight

[bobnoffs]

in cruise are the cabin longerons level or they high or low on the forward end? thanks

 

[Dr_Dave_MT]

in cruise are the cabin longerons level or they high or low on the forward end? thanks

Depends on your airspeed (AOA); what is the TAS? What is the Cruise altitude? Minor, what is the gross weight?

 

[bobnoffs]

lets say at 3500' asl. bar. 29.92 , 170lbs undergross and ias 110 mph

 

[71459]

Of no practical use except when performing weight and balance calculations.

 

[rolivi]

Nothing scientifc here... but if you're LEVEL fkying above a sphere, you'd be ascending. To stay at a constant AGL there should be some nose down pitch to conform to the curvature of the sphere.

 

[bobnoffs]

so the longerons are lower forward?

 

[Draker]

Nothing scientifc here... but if you're LEVEL fkying above a sphere, you'd be ascending. To stay at a constant AGL there should be some nose down pitch to conform to the curvature of the sphere.

An insignificant amount of nose down, though, if we do want to get scientific The ratio between the size of the airplane and the radius of the earth is so great, your angle is effectively zero. I believe the actual calculation would be something like angle = 90 - arccos[(a² + r² -r²) / 2ar] where a is half the length of your airplane (let's say 1 meter) and r is the radius of the earth plus your altitude (let's say 6380000 meters, about 6000ft MSL).

so: 90 - arccos[1 / (2 x 6380000)] or 0.000004490264852 degrees of pitch down. Your angle of attack to remain at an altitude given your speed is going to be a much more significant factor.

 

[bobnoffs]

ok, got it. thank you.

 

[MarkW]

I think the simple answer is yes they are level.
I believe the instructions say to level the longerons to set angle on wheel pants and fairings.