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Jul 18, 2011, 02:39 PM
deltas are cool
AIR SALLY's Avatar
well i think some sort of guide vane/cage could be mounted to the front to hold the rotor in ...that easy .
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Jul 18, 2011, 03:31 PM
efflux RC's Avatar

Safety Guard...


Guys,

Immedeiatley after reading Jim's suggestion last night (thanks Jim ) for a guard in front of the rotor, I contacted Mach about providing such a device, as a solution.

It's currently being addressed, and I'll keep ya posted.
Latest blog entry: Updated blog May 2017
Jul 18, 2011, 05:40 PM
Registered User
LuvEvolution7's Avatar
it could be something as simple as an "X" made of aircraft cable, but if it were me and I had the means, I'de machine something that's aerodynamic for containment. something similar to what holds the starter in place for a turbine, or the IGV system on the WM series fans. jsut a thought.
Jul 18, 2011, 05:41 PM
deltas are cool
AIR SALLY's Avatar
if it looks like inlet guide vanes it can improve the thrust too. the guide vanes i have seen on full scale turbo fan engines actually bends the air so that the rotor takes a bigger "bite" of air . think of them as stators that turn the air into the rotor...but hey even straight vanes would at least catch the rotor and smooth out the incoming air ,a bering could be used too for even better shaft support.
Jul 18, 2011, 05:47 PM
Registered User
LuvEvolution7's Avatar
^^^agreed. totally.
Jul 18, 2011, 06:17 PM
deltas are cool
AIR SALLY's Avatar
WELL GREAT MINDS DO THINK ALIKE
Jul 18, 2011, 08:55 PM
Registered User
LuvEvolution7's Avatar
well, it stands to reason really, when you look at all the early turbojets, they had a moveable stator section before the first stage of compressor blades. it could be moved to give the best air entry to the first stage. that's a little advanced here, but if it's designed at the right angle, as you say, it should increase thrust slightly. my guess is it should use the same amount of blades as the stator section. this makes sense to me, but three would give adequate support and containment.
Jul 18, 2011, 08:57 PM
Registered User
LuvEvolution7's Avatar
now, how do I/we get a patent on this, before it gets produced?..........JIM, EPF, TAM, anyone, anyone, Bueller, Bueller? hahahahahaha.
Jul 18, 2011, 10:20 PM
Xtreme Power Systems
LOL! Too late, I jumped in a time machine and already filed.
Jul 19, 2011, 01:27 AM
Registered User
LuvEvolution7's Avatar
DAMNIT!!!!!!!!!! apparantly, XPS also produce the flux capacitor. hahahahahaha.
Jul 19, 2011, 04:09 AM
Life begins at transition
Interestingly, you guys are talking about something that a company has just been poo-pooed for making, i.e. straight vanes, rotor, stator.
The argument for was 3 bearings is better, the one against was it's statically indeterminate, therefore bad.
Jul 19, 2011, 09:49 AM
Registered User
erh7771's Avatar
Quote:
Originally Posted by Odysis
Interestingly, you guys are talking about something that a company has just been poo-pooed for making, i.e. straight vanes, rotor, stator.
The argument for was 3 bearings is better, the one against was it's statically indeterminate, therefore bad.
So where they saying that straight stators reduce static thrust?

I've got some shrouds that have straight stators and my bench numbers go down noticeably with them using same rotors\motors\escs...couldn't explain it and thought the stators might be the issue.
Jul 19, 2011, 10:09 AM
deltas are cool
AIR SALLY's Avatar
will on full scale the IGV's turn the airtoward the blade in the opp. direction ...i never have understood that but it helps the rotor take a bigger bite of air .....they are hinged to change there angle also ....i dont know if this would help or hurt a EDF. might make it real noisey too
Jul 19, 2011, 10:47 AM
Registered User
LuvEvolution7's Avatar
I think it's because there's no windmilling, or loss of energy associated with a straight flow of air. a swirling mass in the direction of rotation has less losses, thereby giving a bigger bite.
Jul 19, 2011, 12:25 PM
I'm slow but I'm expensive
Ken Lilja's Avatar
Would a FG / kevlar / nylon IGV assembly work? It might deform and absorb the energy without possibly breaking a chunk out of a blade. I assume that it would be easier and lighter than an aluminum version. No carbon here, I think that it would shatter. Setting the IGV angle for best performance would be a side benefit. A variable IGV system is actually not to hard to make, but it may not be as strong, negating the original issue.
http://www.youtube.com/watch?v=aO4kG...layer_embedded
Ken


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