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Old May 08, 2012, 04:10 AM
gundamnitpete is offline
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Team White Llama!
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Quote:
Originally Posted by geostomp View Post
Slope moved back and a rounded shape added. Let me know exactly what you think of the shape.
really really good. That side view is exactly what i was thinking.
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Old May 08, 2012, 05:39 PM
ApexAero is offline
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Aka: Tom Jenkins
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Geo, I didn't say a flat bottom airfoil I said a semi symmetrical. curved on both sides but not equal, not flat. the semi allows for slip stream and lift to a maximum like a smoothed SD6060
and that one behaves well on a short coupled airframe, doesn't loose speed in turns. Notice the high point, this is a laminar foil.
Old May 08, 2012, 07:14 PM
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Bypass Ratio = Infinity
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Isn't the max thickness a little farther back in NLF airfoils? Like the NACA 64 and 65 series.
Old May 08, 2012, 11:15 PM
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take your pick but not symmetrical. thing is naca goes back to the fifties, there is newer stuff out thats coumputer aided in design rather than a slide rule. the Slig-Donovan is for models not full scale
Last edited by ApexAero; May 09, 2012 at 06:58 AM.
Old May 08, 2012, 11:51 PM
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ReVolt- Proprietary Insanity
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Quote:
Originally Posted by ApexAero View Post
Geo, I didn't say a flat bottom airfoil I said a semi symmetrical. curved on both sides but not equal, not flat. the semi allows for slip stream and lift to a maximum like a smoothed SD6060
and that one behaves well on a short coupled airframe, doesn't loose speed in turns. Notice the high point, this is a laminar foil.
Ok I'm definatley leaning toward that airfoil. Flaps should transform any foil into a high lift surface so whatever is slippery would probably be the most fun. I'm not as well versed on all the aspects and history of airfoils so the your insite is appreciated.
Old May 09, 2012, 12:13 AM
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What would be the best way to import an airfoil into a CAD program. Is there a dxf or something?
Old May 09, 2012, 12:17 AM
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Originally Posted by gundamnitpete View Post
really really good. That side view is exactly what i was thinking.
Sweet! I'm glad to make changes to the jet without the use of Bondo this time around.
Old May 09, 2012, 07:00 AM
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Import tiff, jpg, as a raster image then trace it, scale it to what you need.
Last edited by ApexAero; May 09, 2012 at 07:09 AM.
Old May 15, 2012, 09:54 AM
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Import tiff, jpg, as a raster image then trace it, scale it to what you need.
Ok. so I traced the 6060 foil, applied the foil to my wing, and created my wing saddle.
Old May 15, 2012, 01:41 PM
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Shouldn't be a problem getting to the fan, thrust tube, or elevator servos. After calculating the area im going to come in at about 3lbs per sqft. My Rush is 3lbs per sqft and flys great, but it has no flaps so it comes in fast.

Just looking around it seems the bigger birds with 9lb auw have about 400sqft. which is about 3lb per sqft. I have 250 sqft and plan for a 80-90mm at hopefully 5 but maybe 6 lbs. My heaviest rush was 5.5lbs. At 5 lbs I will be at 3lbs per sqft with this new model.
Old May 16, 2012, 04:02 PM
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About done now with the CAD. I can smooth edges by hand when I get a plug milled out. I have a feeling there will still be alot of work to do by hand.
Old May 16, 2012, 07:46 PM
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ReVolt R/C Jet Development (1 min 37 sec)


I would like to get this as exacting as possible, so for my plug I will probably undercut the surface, lay glass and filler, then cut the surface right into the hard outer shell. Sand, prime, paint,wax, mold, layup, stiffen, fly!
Old May 16, 2012, 09:42 PM
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Geo you need more reflex in your duct dwg. Smooth it out!
Old May 17, 2012, 10:24 AM
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Geo you need more reflex in your duct dwg. Smooth it out!
So far my main hurdle with the ducts is clearing the wing. Here it is prior to modification. Please explain how reflex applies to the ducting. Thanks

George
Old May 17, 2012, 10:28 AM
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I don;t know what he is referring to by reflex either. Nevertheless, I have seen ducts with a an S shape like a bandit and seen some that are just a straight shot to the fan like the El Bandito with no curve. I have seen all shapes and sizes. Seems like with today's power systems you can get away with alot and do not have to be that precise. Just my opinion.


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