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Old Jul 20, 2011, 03:32 AM
LuvEvolution7 is offline
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usually generators of some sort, or where a large amount of compressed air is needed. believe it or not, there's a place not far from me that has a RR Merlin as a generator. it sounds so cool when they fire it up, because it sounds so different outside an engine cowling. lots of extra mechanical noises adding to the concert of sweet sounds you here from a similarly powered airplane.
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Old Jul 20, 2011, 06:47 AM
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Just read through this thread. Very cool stuff.

In regards to the AMA thing it amazes me that they allow carbon fiber blades for helicopters and bugger metal fans? How dangerous are helicopters? I've flown helicopters foe years and have seen more thrown blades than I can shake a stick at, not to mention helicopters are flying lawn lower blades without any protection. O well sorry. I know this dead horse has been beat to death but sometimes I wish their was an alternative to the AMA monopoly.

On another note, not having any edf knowledge, wouldn't mounting the motor in front of the fan remove the risk of it flying off?
Old Jul 20, 2011, 06:52 AM
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The blade numbers go up to 11
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If you have a spun alum inlet section which necks down to 100% FSA or so, and it's fixed to the main shroud, if the rotor comes off it will just strike this section and stop. It will make a horrible mess, but not of your face. The main thing is to contain it before it gets too far away and out of control. I think you'll need to do a failure mode and effect analysis on the entire design to see where any danger may come from.

Stu.
Old Jul 20, 2011, 08:22 AM
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Thanks everybody's suggestion
I am carrying on two improvement methods
1.make protective umit prototype.
2.make the prototype motor and inquire the motor factory
I will publish as soon as possible when the prototype modify completes

=^-^=
MACH ESF's
Mach Chuang
Last edited by mach chuang; Jul 20, 2011 at 10:55 AM.
Old Jul 20, 2011, 10:45 AM
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It is a very nice sounding 90mm!!
Last edited by BILLYDSRC; Jul 20, 2011 at 07:12 PM.
Old Jul 20, 2011, 11:07 AM
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Quote:
Originally Posted by stumax View Post
If you have a spun alum inlet section which necks down to 100% FSA or so, and it's fixed to the main shroud, if the rotor comes off it will just strike this section and stop. It will make a horrible mess, but not of your face. The main thing is to contain it before it gets too far away and out of control. I think you'll need to do a failure mode and effect analysis on the entire design to see where any danger may come from.

Stu.
good point...
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Old Jul 20, 2011, 11:09 AM
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Originally Posted by Buzzkill2 View Post
Just read through this thread. Very cool stuff.

In regards to the AMA thing it amazes me that they allow carbon fiber blades for helicopters and bugger metal fans? How dangerous are helicopters? I've flown helicopters foe years and have seen more thrown blades than I can shake a stick at, not to mention helicopters are flying lawn lower blades without any protection. O well sorry. I know this dead horse has been beat to death but sometimes I wish their was an alternative to the AMA monopoly.

On another note, not having any edf knowledge, wouldn't mounting the motor in front of the fan remove the risk of it flying off?
Yeap, and I've seen few of the safety features we're talking about here placed on turbines...
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Old Jul 20, 2011, 01:35 PM
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smug in granny panties
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Yeah it'll take fod well, but another equally futile test that should get the point across. Bead blast a .45 bullet then put it in the gun and fire it at your face. I think it'll still act as a projectile. If anything test confirms to me when a bearing fails,or an adaptor,or if plane crashes and it gets loose (planes do crash) it indeed is so tough it'll stop at nothing to continue it's path. And let's face it AMA is here just for this reason, the laws protect those that can't protect themselves. Pretty sure even beyond rc throwing stars are illegal and unsafe. So laws protect me if a guys convinces himself there safe I still don't have to worry at my local park cause of rules and laws

Barry
Old Jul 20, 2011, 04:18 PM
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one could reconsider to laminate the intake tube with additional kevlar to make it bullet proof As Stu mentioned a 100% fsa intake will catch the rotor when it may come loose...IMO keeping the blades in the ducting is prio #1

Are there destructive tests planned in future?
Still a great fan!
Old Jul 20, 2011, 06:06 PM
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Originally Posted by monkamarm2000 View Post
Yeah it'll take fod well, but another equally futile test that should get the point across. Bead blast a .45 bullet then put it in the gun and fire it at your face. I think it'll still act as a projectile. If anything test confirms to me when a bearing fails,or an adaptor,or if plane crashes and it gets loose (planes do crash) it indeed is so tough it'll stop at nothing to continue it's path. And let's face it AMA is here just for this reason, the laws protect those that can't protect themselves. Pretty sure even beyond rc throwing stars are illegal and unsafe. So laws protect me if a guys convinces himself there safe I still don't have to worry at my local park cause of rules and laws

Barry
When did AMA policies become law?

There's existing rc aicraft flying everyday that's every bit or more dangerous than edf's with metal fans.

Id say the AMA old timers don't like edt noise and it'll never pass until they do.
Old Jul 20, 2011, 06:24 PM
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Quote:
Originally Posted by stumax View Post
If you have a spun alum inlet section which necks down to 100% FSA or so, and it's fixed to the main shroud, if the rotor comes off it will just strike this section and stop. It will make a horrible mess, but not of your face. The main thing is to contain it before it gets too far away and out of control. I think you'll need to do a failure mode and effect analysis on the entire design to see where any danger may come from.

Stu.
A screw on front section is what I proposed to Mach yesterday, as what I thought might be better than the "X"
Wel'll see what he comes up with.
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Old Jul 20, 2011, 06:51 PM
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Quote:
Originally Posted by monkamarm2000 View Post
Yeah it'll take fod well, but another equally futile test that should get the point across. Bead blast a .45 bullet then put it in the gun and fire it at your face. I think it'll still act as a projectile. If anything test confirms to me when a bearing fails,or an adaptor,or if plane crashes and it gets loose (planes do crash) it indeed is so tough it'll stop at nothing to continue it's path. And let's face it AMA is here just for this reason, the laws protect those that can't protect themselves. Pretty sure even beyond rc throwing stars are illegal and unsafe. So laws protect me if a guys convinces himself there safe I still don't have to worry at my local park cause of rules and laws
Barry
This is exactly why certain rules are enforced, often it is not because the product might or might not fail, its because of lowest common denominator factors. We have issue with 2.4G radio gear in Australia, with the prolification of cheap orange rx's popping up at clubs and being the cause of failures and crashes there is a push to ban everything that is not accepted by our MAAA and certified by the ACMA radiocommunications department. Regardless whether the product is technically "safe" or not, the insurance companies will have a field day when they figure out the equipment that injured said party is not "technically" legal to operate here.
Old Jul 20, 2011, 06:54 PM
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wow...13pds on a 90mm without a full intake lip at 114amps settled...

What do turbines around this size do?
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Old Jul 20, 2011, 07:04 PM
LuvEvolution7 is offline
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a screw on front section is a great idea. I also like the idea of putting Kevlar on the intake ducting. sure, it's expensive, but so is the fan and the equipment the fan sits in. I say the user should kevlar the fan shroud and the intake ducting. you know guys are going to be pushing some insane numbers out of these fans, so the safety thing is a must. the manufacturer should provide a certain amount of built in safety and the end user needs to provide the rest.
Old Jul 20, 2011, 07:07 PM
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Originally Posted by Extreme_RC View Post
This is exactly why certain rules are enforced, often it is not because the product might or might not fail, its because of lowest common denominator factors. We have issue with 2.4G radio gear in Australia, with the prolification of cheap orange rx's popping up at clubs and being the cause of failures and crashes there is a push to ban everything that is not accepted by our MAAA and certified by the ACMA radiocommunications department. Regardless whether the product is technically "safe" or not, the insurance companies will have a field day when they figure out the equipment that injured said party is not "technically" legal to operate here.
Well, at least these EDFs are MAAA legal in Australia
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