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O.K. -Lots to discuss now:- The suggestion to look up "research propeller slipstream" was fruitful and helpful thanks- rb1957 Sometimes it’s all about getting the right ‘key words’ to search on – and away you go, find all sorts of wonderful and weird things, It also leads to find out how...

"to understand the relationship between exhaust velocity and how far it travels backwards" puts it very succinctly... J Mayer Vic, Australia

V=Distance x 1/X² [V= velocity X = distance] should read more correctly V= C x 1/X² [V= velocity X = distance C= coefficient] my apologies J Mayer Vic, Australia

Mike that's funny!! It didn't happen to be 'your' turbine by any chance! [bigcheeks] that would make must see on Utube for most of us eng. types Rb1957- thanks for pointing it out - will start and see what I can find on goggle. "propeller slip stream" J Mayer Vic, Australia

IRstuff Thanks for reply. Yesterday was full of activity so wasn’t able to post a reply as soon I want to. So things to discuss: Aspect ratio: 69.9mm diameter x 52.5 mm long so 1:0.75 ratio So for this ‘unusual’ application, high rate dispersal would be a good thing and having high torque is...

IRStuff Correct. Mach 1 is 340.29 m/s, Or 1125 km/hr, or 761 MPH. So 526/340 m/s =Mach 1.68! Wow.... I better stick it on Ebay and sell it for $1000's of dollars that would be one Mean unit!... 100.5 m/s = 361km/hr is also very fast exhaust or efflux! over twice what my car can do flat...

Thanks Mike A small part of a big problem, for a possible US patent in the works... Let you know in 2014 how I turns out!

hot wire?http://files.engineering.com/getfile.aspx?folder=d2aa1799-4bb8-4cdd-9eef-bb004b49527b&file=hot_wire.PNG

Mike, Thanks, Is this diagram correct? Yes/No count x6 main features http://files.engineering.com/getfile.aspx?folder=bb9eb0ac-234c-43a2-a0ce-86cdc9de7c3a&file=Mikes_flow_model.png

'Maths a mess'!-Hmmm I was hoping you weren't going to say that no simple approximations then?- any? And Best way to measure a flow field down at this small RC model scale?

This is My Really Hard Question: I have a 70mm EDF [Electric Ducted Fan] it generates 2.45 kg force at maximum thrust. I then calculate its exhaust efflux velocity to be something like 526 m/s based on an Air density of 1.21kg/m³ to get the same volumetric flow. Mass=Volume*Density 2.45kgs...

Question: What about the pouring-temperature of the teat bar? The casting is thin sectioned and poured at 1200°C or 2190°F along with the test-bar at the same time. Is 1150°C or 2100°F for the testbar more appropriate I recall reading A obsolete Foundry article. that the grain structure changes...

Thanks, Unclesyd this is helpful as well, and I had been given some thought to the same idea about the possibility of using a partial substitution of lithium as a deoxidizer but hadn't heard of any one doing with this type of alloy. I'm familiar with using this, along with Calcium boride as a...

Thanks TVP. - good advice, I'll see if we can get a micro done and see what that turns up - Has anybody got any more further thoughts?

One of Vendors, makes Bronze Impellers from 20 to 300 kgs is having issues acheving the full elongation values for a nominial (88/10/2) Bronze Compostion. That requires a 13% minimium elongation value to comply with AS1565/Grade C92610A. From what I can discern the chemical compostion complies...

Hi JasonLouie We make various ni-resist impellers all the time, almost daily...yes, it can be done... what size impeller do you have in mind? and were do you live? and what sort of application?

Double check your nickel content 1-2% is about a good min. aim it'll held keep the lead in suspension. we had a case the other day where the lead was about 2% lower than the bottom of a 400mm casting just from the gravity effects it allways tends to settle to the bottom. chilling and...

found this link by accident might be what your after: http://www.ductile.org/magazine/2004_3/ianlee.pdf

Try this approach: Thermal modulus= Volume/Area then for time to cool for example is worked by times the modulus by the approprate co-efficant and square it i.e minutes=[modulus x 1.64]² this coeffecient here is for time for solidication of steel in a sand mould from say 1600°C to 1500°C...

Has anybody had any experience, with Designing the 'Perfect Pouring Basin'? Current thinking tells us that the offset 'wier' or step design is the best. however when dealing with the aspect of preventing splash back when a ladle has gets too high above a mould. Say 500mm or 1½' a undercut design...