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  1. fpm

    Damage and Tarnish on Inco625 parts

    Thanks folks. I'll try to look into cavitation. We have an even smaller orifice later in the flow path in the same nozzle that is less than 1mm in diameter, which we have had no problems with. Mind you, the nozzle assembly is pretty complex, so the 2 parts are not necessarily seeing the same...
  2. fpm

    Damage and Tarnish on Inco625 parts

    No, they're not usually cleaned out, there are changeable filters in the upstream lines which would be swapped on a regular basis, but the system woudn't be flushed with any sort of cleaning chemicals. There's always a chance of much higher pressure I guess, since the customer controls the...
  3. fpm

    Damage and Tarnish on Inco625 parts

    Hi all, My company uses Inconel 625 parts in a water spray nozzle. The nozzle sprays fresh water at around 80-90degC and 50-90psi. pH is pretty neutral. The suspended solids content of the water is less than 5mg/l and dissolved iron is less than 0.5mg/l. Our problem is that we have had...
  4. fpm

    Aspect ratio of multi-element wing?

    Thanks again rb... In one way it was more out of curiosity to be honest, as I realised I'd never seen anything about calculating the aspect ratio of a multi-element wing. As you guessed, the flaps are not only different profiles to the main plane, but also inclined! I will be running some CFD...
  5. fpm

    Aspect ratio of multi-element wing?

    Thanks rb1957, I'm looking at a racecar wing with a main plane, and 2 trailing edge flaps. Thanks, FP
  6. fpm

    Aspect ratio of multi-element wing?

    Hi, I've had great help on here before, so I hope you guys can maybe help me out this time too! Its a simple question: I know how to calculate the aspect ratio of a simple rectangular wing, but how do I do it if the 'wing' consists of more than one element? Is it (AR1+AR2+AR3)/something??, or...
  7. fpm

    Custom SS extrusions

    Hi again guys, Looking at it, I could probably get the main part down to 170mm x 240mm...maybe this would help my cause..? Thanks, FP
  8. fpm

    Custom SS extrusions

    Hi guys, Thanks for the replies. Yes, I appreciate that its a large section, currently we fabricate the section from a number of forms welded together, but the thought was that we could shorten our lead times if we could get the whole thing extruded in one go. Wishful thinking maybe...!? FP
  9. fpm

    Custom SS extrusions

    Hi, I'm trying to find a company that can do custom stainless steel extrusions. Extrusion will be roughly 300mm x 300mm, and needs to be capable of being produced up to 7 or 8 metres long. In x-section, its roughly a hollow square with another hollow rectangle inside. Is such a thing possible do...
  10. fpm

    Help on lift and drag coeff calculations please....

    Thanks rb! Yes, correct, I was incorrectly using 3d lift slope in the 2nd equation, which was effectively reducing the Cl by the AR twice, giving me smaller numbers. Thanks for pointing that out, bit of brain fade on my part...! As for the drag I'll have to keep looking, theres something I'm...
  11. fpm

    Help on lift and drag coeff calculations please....

    rb, you're right, this is a racecar application. Problem is, by its very nature, specific data is hard to come by as people are secretive with it! Yes, if I have the lift slope then I can convert alpha to Cl quite easily, but my query was as to why the 2 formulas (both seemingly for 3D wings)...
  12. fpm

    Help on lift and drag coeff calculations please....

    As regards the drag figures, I've dug out the 2 books I was thinking of: Competition car Aerodynamics: Simon McBeath. He gives an example of a wing, 1.2m wide, giving a lift force of 769N, and 195N of drag. He doesn't give speed or chord, but guessing speed of 45m/sec, and chord of 0.3, that...
  13. fpm

    Help on lift and drag coeff calculations please....

    Thanks rb. 1) I thought this too, although the 1st equation contains the term 'Cl alpha' as the lift slope of a 3d wing, I thought maybe this was enough to take into account the 3d effects. That being so, the 2nd equation then takes into account AR in 2 places: in he equation itself, and in the...
  14. fpm

    Help on lift and drag coeff calculations please....

    Hi guys, I hope you can help me, I've got 3 questions (a bit greedy I know...) I'm researhing into simple wing designs, and have come up with the following queries, I intend to run some CFD on some designs, but I want to have a feel for the numbers I should be seeing, rather than just blindly...
  15. fpm

    254 SMO Vs 4565

    Hi all, My company produces a product, parts of which are made from 254 SMO rather than 316, when extra high corrosion resistance is required. We are experiencing periodic difficulties in getting our hands on 254SMO plate, and I want to investigate the potential to use another material. I've...
  16. fpm

    Who can machine 5m+ of Alu7075?

    Thanks for all the replies! Much appreciated. We had a vendor lined up to do the job, but now, 2 months after getting the drawing, he informs us he has to weld 2 sections together to get the 5m length, and this is not really an option. Unfortunately we only need 2 of these pieces in total, its...
  17. fpm

    Who can machine 5m+ of Alu7075?

    Hi I hope this is the right place to put this... I'm looking for a vendor who can provide me with a roughly 5 metre long section of 7075 T6 or T7. The cross section is roughly square, but one side is pointed, giving a 'triangle on top of a square' shape. Its about 40mm by 20 mm. Does anyone out...
  18. fpm

    7075-T6 Vs 7075-T7x

    The part will be a long bar, roughly rectangular, in a cyclic bending mode. Bending will be of the region of 50 microns between each load point, each point 100mm apart. There will be no sharp cuts or notches in the profile, other than a series of tapped holes to allow loading rods be fixed to...
  19. fpm

    7075-T6 Vs 7075-T7x

    Hi all, I'm currently researching a suitable material for a component I'm designing. I've pretty much settled on 7075 aluminium, but I'm now seemingly faced with the choice between T6 or T73/T76. From what I can see, the T73/76 offers better resistance to SCC than the T6, but at a price of a...
  20. fpm

    Industrial rollers

    Hi there. I'm trying to put together a type of trolley that is to run on top of 2 large diameter rolls (approx 1 metre). I need to find industrial rollers that will be strong enough to take a weight of a tonne or more,and are made with, or at least covered with, preferably a plastic of some...

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