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Hello, I wonder if someone with knowledge of the alodining process could comment on the advisability of alodining assemblies (as opposed to separate parts that are later assembled which is normal practise). What problems and issues are likely to be encountered ? I have two scenarios in mind...

Hello, I have a requirement to design a polyurethane wheel for an industrial application - imagine something similar to a skateboard wheel. The wheel is to be cast in a steel mould. Can anyone tell me what materials are most commonly used for wheels of this type. I repeatedly find...

Hi All, Does anyone one here have experience in performing fluter and/or aeroelastic analysis with NASTRAN ? If so I have a question regarding the spline elements that connect the aerodynamic and structural meshes. The NASTRAN documentation leaves many unanswered questions about how these are...

Hi, Can anyone tell me what are the typical design conditions for the inlet diffuser on a turbofan engine for an airliner, for example a JT9D as used on the 747-200. By design condition I mean what flight condition (i.e. static, takeoff, climb, cruise etc) is the main design point used to...

Thanks you all for your advice. The spring I am looking at replacing is of Danly manufacture. A look in their catalog shows that the existing 2" dia x 12" (50mm x 300mm) long heavy duty spring could carry a peak load of approx 750 kg (1650 lb) at 72mm deflection. The extra heavy duty spring...

Yes the bearings are well greased.

Hi All, I need to do some work designing steel coil springs (approx 2" dia x 12" long - loads approx 1500-2000 lb). I am familar with the basic theory of coil springs for calculating stresses etc however I have a couple of questions of a more practical nature: 1. What are the most common steel...

Hi All, I have a bronze bearing through which a chrome plated steel tube slides (actually the lower bearing in a telescopic landing gear leg for a light aircraft). The bearing is a hollow cylinder approx 1.25" high with a bore of approx 2" and is pressed into the outer tube of the leg and...

Tom, Thanks I have just downloaded it. I will read it tomorrow. Steve

Tom, Yes I figured you had that around the wrong way ... good to have it confirmed though. Thanks. The copy of Gobel that I have coming is: Rubber Springs Design by E. F. Göbel. (Translated and edited by A. M. Brichta.) New York, Wiley [1974] "A Halsted Press book" 211 p ISBN...

Tom, Thanks again .. invaluable information. I have tracked down second hand copies of both Gobel and Lindley and should have them within a week. I will read and digest their contents and then post again if I have further questions. Your help is greatly appreciated. Steve

Well yes I agree .. it is a bit odd. I didn't design it though. It is similar to other designs in widespread use. However I would consider replacing the long cylinder of rubber with cylinders of the same diameter but only approx 2" high. Approx 6-7 of these could be stacked on top of one another...

Hi All, I have a rubber cylinder 40mm dia (1.57") and 331mm (13.03") long. It is made from natural rubber of duro 50. The rubber is supported from buckling under compressive load by a number of diagaphrams that slide over the rubber and are evenly spaced along the length. I need to predict the...