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Forum: Tech Log

4th Feb 2018, 17:36

Replies: 30

FPV (Birdy)

Views: 4,907

Posted By eckhard

A good question which I’ve often pondered myself....

A good question which I’ve often pondered myself.
There’s no doubt that the floor is inclined in the cruise. Just try pushing and pulling a heavy trolley!

Forum: Tech Log

4th Feb 2018, 17:02

Replies: 30

FPV (Birdy)

Views: 4,907

Posted By eckhard

Some more interesting figures from the 787 sim at...

Some more interesting figures from the 787 sim at LRC, FL370, ISA, 200T:

N1 86%
FF 2700kg/hr (x2) = 5,400kg = 11,900lbs
Weight 440,873lbs
Total Thrust 21,900lbs
Therefore L/D=20/1

Thanks...

Forum: Tech Log

4th Feb 2018, 16:39

Replies: 30

FPV (Birdy)

Views: 4,907

Posted By eckhard

I’m actually ‘flying’ in a 787 FBS. Here are...

I’m actually ‘flying’ in a 787 FBS.
Here are some figures from the Sim Maintenance pages:

Weight 200 Tonnes (typical mid-cruise)
FL370 ISA (close to Optimum of FL366)
CG 25% MAC
LRC M0.853 /...

Forum: Tech Log

4th Feb 2018, 14:33

Replies: 30

FPV (Birdy)

Views: 4,907

Posted By eckhard

You’re right of course. L/D max would equate to...

You’re right of course. L/D max would equate to maximum endurance, but max range (which is very close to LRC) would be faster.

Here’s a quote from NAVWEPS by HH Hurt:

“The maximum range is...

Forum: Tech Log

4th Feb 2018, 14:08

Replies: 30

FPV (Birdy)

Views: 4,907

Posted By eckhard

Well then that also would make sense of the 3*...

Well then that also would make sense of the 3* nose up attitude in the cruise.

So, 3* angle of incidence + 3* attitude = 6* AoA.

Forum: Tech Log

4th Feb 2018, 10:58

Replies: 30

FPV (Birdy)

Views: 4,907

Posted By eckhard

Well, given that most airliners seem to cruise...

Well, given that most airliners seem to cruise with about 2 or 3 degrees nose up attitude, and given that the angle of attack for LRC is about the same, I would say that incidence is close to zero.

Forum: Tech Log

4th Feb 2018, 10:38

Replies: 30

FPV (Birdy)

Views: 4,907

Posted By eckhard

I think your suspicion is well-founded. The angle...

I think your suspicion is well-founded. The angle of attack will be found by subtracting the FPV from the aircraft pitch attitude and then adding the angle of incidence.

However, given that we...

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