Private Jet Charter Jets
Aviation - Aerospace Springs Design and Development
November 25, 2009 on 6:59 pm | In General Aviation | No Comments Now it’s time to cover taking off in a crosswind. We’ve already discussed flying in a crosswind and how the wind blow you off course, and how you need to compensate. This, of itself is not very difficult to deal with.
What comes before this though, is Taking off!
Chrome Silicon, Chrome Vanadium .010-.500 These are higher quality, higher strength versions of Oil Tempered wire, used in high-temperature applications such as automotive valve springs. Will not generally change dimensions under heat. Can be plated.
Stainless Steel .005-.500 Stainless steels will not rust, ideal for environments containing water or condensation. 302 series stainless will expand slightly under heat: 17-7 will usually not change. Cannot be plated.
Inconel, Monel, Beryllium Copper, Phosphor Bronze .010-.125 These speciality alloys are sometimes made into springs which are designed to work in extremely high-temperature environments, where magnetic fields present a problem, or where corrosion resistance is needed in a high-temperature working environment. They are much more costly than the more common stocks and cannot be plated. They generally will not change dimensions under heat.
Titanium .032-.500 is common in aircraft because of its extremely light weight and high strength, titanium is also extremely expensive and dangerous to work with as well: titanium wire will shatter explosively under stress if its surface is scored. Generally will not change dimensions under heat. Cannot be plated.
Titanium is the strongest material, but it is very expensive. Next come chrome vanadium and chrome silicon, then music wire, and then oil tempered wire. The stainless and exotic materials are all weaker than the rest.
The danger of a crosswind is two-fold. It is going to try to blow us away from the center line and off the runway, and it is going to try to get under the upwind wing and flip the plane over.
To compensate for this, we want to turn the aileron so that the wind has as little impact on the upwind wing, so we turn so that the upwind aileron is pointing up. It is best to get a visual on this, as opposed to just guessing which way to turn.
No, as you start, you have full deflection - you have turned as hard as you can. As you take off, you will lessen this so that you are turned about 45 degrees. You will lessen it more and more as you gain speed, but as you approach take-off speed you want the yoke to be still turned slightly into the wind.
You will maintain direction with the rudder using the rudder pedals.
Compression springs.
A compression spring is an open-coil helical spring that offers resistance to a compressive force applied axially. Compression springs are usually coiled as a constant diameter cylinder. Other common forms of compression springs-such as conical, tapered, concave, convex, or various combinations of these-are used as required by the application. While square, rectangular or special-section wire may have to be specified, roundwire is predominant in compression springs because it is readily available and adaptable to standard coiler tooling.
Compression springs should be stress-relieved to remove residual bending stresses produced by the coiling operation. Depending on design and space limitations, compression springs may be categorized according to stress level as follows:
1. Springs which can be compressed solid without permanent set, so that an extra operation for removing set is not needed. These springs are designed with torsional stress levels when compressed solid that do not exceed about 40 percent of the minimum tensile strength of the material.
2. Springs which can be compressed solid without further permanent set after set has been initially removed. These may be pre-set by the spring manufacturer as an added operation, or they may be pre-set later by the user prior to or during the assembly operation. These are springs designed with torsional stress levels when compressed solid that do not exceed 60 percent of the minimum tensile strength of the material.
3. Springs which cannot be compressed solid without some further permanent set taking place because set cannot be completely removed in advance. These springs involve torsional stress levels which exceed 60 percent of the minimum tensile strength of the material. The spring manufacturer will usually advise the user of the maximum allowable spring deflection without set whenever springs are specified in this category.
In designing compression springs the space allotted governs the dimensional limits of a spring with regard to allowable solid height and outside and inside diameters. These dimensional limits, together with the load and deflection requirements, determine the stress level. It is extremely important to consider carefully the space allotted to ensure that the spring will function properly to begin with, thereby avoiding costly spring development changes.
Resource Author Francisco R. Higueras
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No related postsLook at this Vintage Airplane for Sale at Auction!
July 6, 2009 on 5:38 am | In General Aviation | No Comments
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