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Author Topic: 220mph Proximity  (Read 12188 times)

ched

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Re: 220mph Proximity
« Reply #105 on: November 21, 2020, 04:26:06 PM »

I think it was to do with speed that they wanted out of the heli or maybe it was lift. One thing to note is that commercial aircrafts have to comply with noise regs. Military aircrafts don't :-) So it could be that the tips help speed or lift but create lots of noise. Again civilian aircrafts have fuel consumption specs that they must adhere to, military aren't very bothered. Can't remember much, had a few chats over a coffee with a few of the blokes that used to work on testing the blades. Quite often when testing stuff you were never told why the tests were being carried out as that might bias the results. Some of them also worked on the Concorde engine and intake development and testing way back. Used to be some interesting conversations. There was a Red Dwarf episode where part was filmed in the test cell where Concorde intake ducts were developed!!!
 
I remember doing flight certification test for RR Trent 500  (civilian) and they were trying to get me to 'tweak' the thermodynamic calcs. I thought it was a bit iffy so had a chat to our mathematician to confirm that the 'tweaks' would alter things in their favour!!!! I was in charge of the data and calcs that would be submitted to CAA to gain the engine flight certification. Unfortunately we never did the chicken ingestion tests :-) Lots of water and ice but no chickens.

As for your props, way above me mate. Thermodynamics I had a reasonable understanding of, well calcs anyway not theory.
Always interesting to hear about the lengths you go to to build your crafts.

omegooliebird

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Re: 220mph Proximity
« Reply #106 on: November 22, 2020, 06:56:32 PM »

Another quick test today to see amps at full throttle on 14s.. peaking around 180a.. guessing 50v under load....so, 9kw... that's 12 horsepower according to Google..through a 7 inch off-the-shelf prop!! It is so insane I can't quite make sense of it.. Some losses along the way, but that prop hub is still probably seeing 7 or 8 kw .. it's just incredible.

« Last Edit: November 23, 2020, 02:29:01 PM by omegooliebird »
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Coyote

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Re: 220mph Proximity
« Reply #107 on: November 23, 2020, 06:03:27 PM »

That sounds vicious :) :)
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