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Search: Posts Made By: Mach Stall
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Forum: Tech Log
24th Jan 2017, 04:02
Replies: 21
Views: 3,841
Posted By Mach Stall

In my question I was excluding center section...

In my question I was excluding center section fuel tanks contained within the wing's pass-thru structural center section. Even though there admittedly isn't a lot of room for fuselage tanks in most...
Forum: Tech Log
23rd Jan 2017, 21:47
Replies: 21
Views: 3,841
Posted By Mach Stall

Fuselage Fuel Tanks

What specific regulatory (and/or practical industry) restrictions are there on the use of fuselage fuel tanks (located outside of the cabin pressure vessel) in transport category aircraft?

I've...
Forum: Tech Log
16th Nov 2016, 09:30
Replies: 12
Views: 3,179
Posted By Mach Stall

Absolute minimum rotation speed

Are there scenarios where the start of rotation could intentionally occur at or below stall speed, say for extreme STOL operation (e.g., bush pilots)? I'm especially curious if it would be important...
Forum: Tech Log
4th Aug 2016, 18:11
Replies: 24
Views: 7,857
Posted By Mach Stall

The sole concern with A Squared's calculation is...

The sole concern with A Squared's calculation is that it assumes thermal equilibrium is reached for the assumed gear strut mass (i.e., plenty of time for the thermal energy to diffuse through that...
Forum: Tech Log
25th Jul 2016, 10:16
Replies: 24
Views: 7,857
Posted By Mach Stall

Pulse1, I can't support the 500 deg C...

Pulse1, I can't support the 500 deg C temperature, but what some seem to be overlooking is that shock absorbers function precisely by generating heat. Kinetic energy is absorbed by internal fluid...
Forum: Tech Log
7th Dec 2015, 22:22
Replies: 20
Views: 7,177
Posted By Mach Stall

I have to take issue with several posts here...

I have to take issue with several posts here regarding metals. Steel is hardly some outlier metal or alloy in terms of having a fatigue endurance limit (basically the stress at which theoretically...
Forum: Tech Log
8th Nov 2015, 10:25
Replies: 6
Views: 1,808
Posted By Mach Stall

Vd Dive Speed -- Overspeed Protection?

I'm hoping someone could shed more light on how the FAA handles overspeed/autothrottle protection (e.g., wrt FAR Part 23.335) in determining Vd (design dive speed).

As I read these regs, and I'm...
Forum: Tech Log
25th Oct 2015, 12:22
Replies: 2
Views: 2,786
Posted By Mach Stall

New business aircraft under Part 25 -- Single Pilot Exemption

I'm very interested as to how difficult it would be to certify a newly designed business aircraft for single-pilot operation under FAR Part 25. (I should stress the question has to do with FAA...
Forum: Tech Log
8th Sep 2015, 14:21
Replies: 1
Views: 981
Posted By Mach Stall

FAA/EASA -- FBW with neutral static stability

I'm curious whether the regulators would allow a future FBW aircraft to be certified with close to neutral longitudinal static stability under all flight modes. I understand they have allowed...
Forum: Tech Log
6th Sep 2015, 10:49
Replies: 5
Views: 1,279
Posted By Mach Stall

No Fly, probably not enough EtOH, maybe that's my...

No Fly, probably not enough EtOH, maybe that's my problem -- I'll go work on that...
Forum: Tech Log
6th Sep 2015, 10:47
Replies: 5
Views: 1,279
Posted By Mach Stall

Clandestino, I'm certainly open to being wrong,...

Clandestino, I'm certainly open to being wrong, but as I understood it, the B777 and B787 have 3 basic modes for manual control- Normal, Secondary, and Direct, and that all three involve pitch...
Forum: Tech Log
6th Sep 2015, 08:55
Replies: 5
Views: 1,279
Posted By Mach Stall

Dihedral with FBW - spiral stability /wingtip strike angle vs divergent Dutch Roll

I'm curious what design priority pilots would prefer with a FBW system, with respect to tuning the wing dihedral of the aircraft. Of course, with more dihedral comes worse Dutch Roll but better...
Forum: Tech Log
24th Aug 2015, 22:37
Replies: 4
Views: 7,510
Posted By Mach Stall

Wing area (exposed, reference, gross) vs CL & Cl

Here's a question for the highly technical aerodynamicists. Maybe I'll stump the band with this one.

My question is- between the various wing area definitions, which more accurately reflects the...
Forum: Tech Log
8th Aug 2015, 15:25
Replies: 1
Views: 1,105
Posted By Mach Stall

Average yaw deviation angle at cruise

I'm curious how many degrees from nominal a modern commercial or business aircraft will typically deviate while at cruise (with A/P, yaw damper on) about its yaw axis in straight/level flight. I...
Forum: Tech Log
9th Jul 2015, 22:20
Replies: 30
Views: 7,081
Posted By Mach Stall

The short answer is that, in the domain of most...

The short answer is that, in the domain of most subsonic business and commercial aircraft, there is actually no aerodynamic constraint preventing turboprops from competing in speed and efficiency...
Forum: Tech Log
25th Aug 2014, 16:27
Replies: 16
Views: 3,577
Posted By Mach Stall

Centerline-thrust multi: effect on Vspeeds?

I'm curious how a centerline thrust twin-engine airplane design would alter the takeoff (V1, Vr, V2) and approach/landing (Vref) speeds -- if at all -- both from an engineering and regulatory...
Forum: Tech Log
15th Aug 2014, 08:27
Replies: 7
Views: 5,331
Posted By Mach Stall

Max altitude of turboshafts?

I'm trying to understand if turboshaft engines have any design constraints that limit their maximum altitude. For example, the GE CT7-8 turboshaft has an operational limit of 22,000 ft. Yes, I know...
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