Wil,
SOP at the office where I worked (mod/repair cert.) was to always use B-values to calculate strength of existing structure, and always use A-values for our design work. So, I'd sit in the analyst #2 camp--I've just never had satisfactory lab certs at my disposal.
Regards
Peter7307,
Back in the late 30's when NACA was investigating painted finned cylinders for air-cooled aircraft engines, they found that with black enamel the best results came from coatings .002" thick, and by .005" thick the performance was about the same as unpainted cylinders. I don't...
gildfind,
I'm not sure where or if it's written down anywhere, but for guidance, 3 degrees max change of direction through a fairlead is a pretty commonly-accepted limit it seems. I believe I've also seen that number given on homebuilt inspection criteria lists (for use by the inspectors)...
Joblack,
FAR 23 Appendix A contains a simplified method for determining control surface loads. Other national versions of FAR 23 probably contain a similar appendix.
Regards
WrongBrother,
Sorry, mixed up the numbers off the top of my head. It's NACA Report 721, or NACA TN-796. I believe they're both the same thing, both from 1941, and both titled:
"Determination of control-surface characteristics from NACA plain-flap and tab data"
That should be enough info to...
WrongBrother,
NACA TN-721 is the classic material from which (it seems) all else is based. It's directly applicable to tail surfaces. Ailerons seem to be ballparked, as 'adequate' and 'inadequate' roll is very subjective and can cover a large range.
TN-721 (like all good things) is available...
So the question that I have for you is this. What are you going to do about it now that you know that?
dporte17,
At the risk of being ground beneath the heels of the profession, my honest answer:
I will continue to do absolutely nothing.
I don't even know for certain whether this practice...
buzzp,
Alright, I'll bite. I'm a good Canadian lad, with a Mech Eng degree. I've worked in aircraft mod/certification and OEM supplying the automotive industry. I have, and my departments have, designed products for sale to both individual and commercial customers, as well as internal...
Lorentz,
Yes, this all happened in early 2000. Here, I was too lazy to track down the follow-up link before:
http://www.avweb.com/news/atis/181948-1.html
Both articles are pretty good reads, especially for those of us that have never been in a union or had to negotiate employment contracts...
Lorentz,
Before you resign yourself to a position of powerlessness (which, I think, alot of engineers are apt to do), take a look at one engineer's account of participating in the Boeing engineering strike (which is the only engineering union strike I can remember hearing about)...
SparWeb,
Thanks for the lead! There's nothing like curling up in the easy chair with an old text or NACA report, pencil and calculator in hand.
Regards
motorsportsdesign,
Well, if you've already got the large fortune, why don't you just bolt together two of these V-4s:
http://www.deltahawkengines.com/drawin00.htm
It's diesel, of course, but the rest is close. :)
Regards
Thanks for that, I hadn't heard anything about it yet. Guess I know what I'll be reading through this weekend.:)
So, for the real question: what are we supposed to call the new handbook? Seven-letter acronyms never roll of the tongue well in conversation. Until I hear something better, my...
A couple details to add:
Yes, laminar separation is rare; it requires (as you can imagine) very low Re flow. The only place I've run into it is the design of airfoils for small, slow model airplanes and human-powered aircraft. Google 'laminar separation bubble' if you're interested in...
RDK,
I think the idea of carrying personal O&E insurance is wise indeed, and one that I (also an employee) hadn't ever considered. I'm going to send out for quotes.
The tricky bit with SparWeb's example is that provincial engineering law is often bypassed in the engineering side of the...
This was brought up briefly in a rather infamous thread, and I'd like to fill-in a rather glaring hole in my knowledge.
The short story: Miper has posted in the past that a tail download must always be present to ensure adequate longitudinal dynamic stability. (My apologies if I've...
The most I can think of on a production engine would be 28 (4 rows of 7) on the P&W R-4360.
On non-production engines, the most I've heard of is 36 (4 rows of 9) on the Lycoming XR-7755.
That is, of course, by no means authoritive; any others out there?
Regards
koopas,
Nice link, thanks for that. I'll give my offhand answers to your questions, but keep in mind--they're worth what you paid for them:
1. Short answer: yes. Just as you figured, I'm sure.
2. I think you're putting the cart before the horse here:) The doubler isn't being loaded by the...
This certainly isn't a historical example, but I think it's such a good modern example that it's germane to this thread:
There's a series of books authored by David Gingery that details how--using hand tools--you can build a completely functional set of metalworking machinery. The process...
