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Old Apr 07, 2002, 10:57 PM
Registered User
Vassar MI USA
Joined Nov 2000
330 Posts
constructing a fan?

im interested in what is the best way to make the groves in a wooden hub?
i used my hand saw with some what good luck but the problem comes in with depth of the cut

also how do cut each of the blade equal?

i made a fan (just the rotor) this weekend and will be testing it tomorrow

6 blades 2inch diam 2.22 inch^2 blade area power .061 norvel
i would have went electric if it was avaible (as in at home)
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Old Apr 08, 2002, 12:02 AM
York Electronics
Gary Warner's Avatar
Dallas Tx USA
Joined Apr 1999
2,505 Posts
Isn't "NORVEL" on the filter list as a bad word?

Can't help you with your problem but I've very interested in hearing how this works out. (Yes, I too has some nitro in the garage!)

Suggest a razor saw (Exacto) in a custom jig?
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Old Apr 08, 2002, 03:37 PM
Registered User
Vassar MI USA
Joined Nov 2000
330 Posts
i was using a xacto razor saw...

after i balance it ill get it going tonight or tommorw then ill either make a ducting for it or make a better fan

ya i had a hard time getting norvel on here...had to type n o r v e l then close the spaces
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Old Apr 08, 2002, 04:07 PM
York Electronics
Gary Warner's Avatar
Dallas Tx USA
Joined Apr 1999
2,505 Posts
Funny!

If you have pictures I'd love to see what you've come up with.

Gary
--
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Old Apr 08, 2002, 06:34 PM
Registered User
Vassar MI USA
Joined Nov 2000
330 Posts
IT FAILED :(

in my attemps to get the engine started. . . one of the blades broke. . . then another. . .then i took it off and proceeded to break the others testing there strangth to the max then past

i found that my construction style needs to be improved alot
i think that engine would have tosed all the blades one after the other...very dangerous!!

i also found it imposible to ballance it.. due to a blade that off center...all the others were fine

well back to the drawing board
next design will probly be a larger 3 blade design with less pitch
2 inch fan wasn't working i think 2.5 will work out better

i figured out that i need a better starting method too... what happened was i would flip it over then it would kick back and after a few times the blades broke...
ill either have to make an addapter to use my 12 starter that hangs down further then the motor it self so i can start in when its inside of a plane
or get a stater made for that engine
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Old Apr 08, 2002, 06:48 PM
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orlando fl
Joined Oct 2000
5,714 Posts
this is what I did
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Old Apr 08, 2002, 06:51 PM
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orlando fl
Joined Oct 2000
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here is the finished product
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Old Apr 08, 2002, 06:55 PM
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orlando fl
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one more
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Old Apr 08, 2002, 07:17 PM
Registered User
Vassar MI USA
Joined Nov 2000
330 Posts
hey dave

how did it turn out? did it run well? what did you get on thrust?
what engine?

i figured that the muffler on that norvel wasn't needed so i simply left it off
all it does it lessen the proformace and muffle it a lil bit and is in the way of the air flow
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Old Apr 08, 2002, 07:32 PM
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orlando fl
Joined Oct 2000
5,714 Posts
It has a norvel .061 ame, no muffler, has throttle. The tank is a 1oz round tank mounted aft of the engine. This make for a nice complete subassy. Runs very smooth (no problem with fuel frothing), makes about 12oz thrust. Noisy as all get out and a big slimey mess, so I have pretty much abandoned it. Also starting was aways something of a nightmare, tended to unscrew the fan. I think the limit is on RPM best you can hope for would be about 25k which on this small a fan(about 2.25") just cant make much more than 12oz and I have no idea but the exit vel seem low. I mounted it on a walmart foamie,(slow but fun) and then on a small pylon like plane (DMA Flea) flew ok but still not very fast. AUW was about 6 oz with fuel. I think with the good E stuff out there that that is the way to go for small DF, after all you can just add more batteries to get more power.
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Old Apr 08, 2002, 09:14 PM
Registered User
Vassar MI USA
Joined Nov 2000
330 Posts
im starting to think glow just is not the way to go...

after all that work im back at square one. . .
i have the norvel with out throttle

it seems that electric would be much more "up" to the challenge

there are people out there that make really good fans
the people from wometec had to start somewere!
steveC made his own fan from what i have heard it really kicks!
the 2 fellows that made the twin rafale made there fans!
im sure there are others that have had success

if only i had some documentation on ducted fans so that it wouldn't be a "shot in the dark"
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