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Old 07-30-2007, 04:16 AM
  #151  
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Originally Posted by Prof100 View Post
It is 1/2" step.
What is the wing's chord?
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Old 07-30-2007, 05:40 AM
  #152  
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Originally Posted by kaos2 View Post
What is the wing's chord?
7.25"
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Old 07-30-2007, 02:06 PM
  #153  
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Originally Posted by Prof100 View Post
7.25"
Ahhhh. I see what you've got going on here. On a bottom-step KF wing, the step height is measured from the step, to the top side of the wing. The percentage is actaully the total wing thickness relative to the wing's chord, not just the height of the step above or below the material to which the step is attached. Your "1/2 inch" step is actually a 10% step, not a 7% step. This is assuming that the the wing thickness prior to the addition of the step was the same thickness as FFF. If it was thicker than FFF, your step is greater than 10%. If you really want to try the KF wing designed as others are using it prersently, I think you need to reduce the step height filler material to 1/8" or zero. A KF step created by the thickness fo FFF alone would be in the 7% range for a wing chord of 7.25". A 1/8" filler height would guve you a 8.25% KF step height. Both of those steps will fly very well. The wing shape you're attempting to fly has already been assessed by someone and determined to be unacceptable. Of course, this is all based on my present understanding and experience with the KF wing. I'm not trying to be critical, just helpful.

Good luck.
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Old 07-30-2007, 02:20 PM
  #154  
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Originally Posted by kaos2 View Post
Ahhhh. I see what you've got going on here. On a bottom-step KF wing, the step height is measured from the step, to the top side of the wing. The percentage is actaully the total wing thickness relative to the wing's chord, not just the height of the step above or below the material to which the step is attached. Your "1/2 inch" step is actually a 10% step, not a 7% step. This is assuming that the the wing thickness prior to the addition of the step was the same thickness as FFF. If it was thicker than FFF, your step is greater than 10%. If you really want to try the KF wing designed as others are using it prersently, I think you need to reduce the step height filler material to 1/8" or zero. A KF step created by the thickness fo FFF alone would be in the 7% range for a wing chord of 7.25". A 1/8" filler height would guve you a 8.25% KF step height. Both of those steps will fly very well. The wing shape you're attempting to fly has already been assessed by someone and determined to be unacceptable. Of course, this is all based on my present understanding and experience with the KF wing. I'm not trying to be critical, just helpful.

Good luck.
Well, well, well I truly deserve the dumbass award for this one. Or, maybe dumbass is the incorrect term. I am simply ignorant of all the facts.

Yes, the 1/2" step is truly the height of the step I added. The thickness of the fan fold and basswood square piece spacer equals 1/2 inch. A Super Cub is NOT a flat wing. Guesstimating the wing thickness prior to to adding the step I would say it is close to one inch so the total is 1.5". Doing the calculation again (dividing 1.5" by 7.125" cord) equals 21%. That might explain the evil handling I was experiencing. It sure as heck wanted to climb with this configuration.

Simply adding a 1/4" (approximate) thick piece of fan fold to the plane would work. Correct? Should I taper the front leading edge of the fanfold or leaving blunt?
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Old 07-30-2007, 02:32 PM
  #155  
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Originally Posted by Prof100 View Post
Well, well, well I truly deserve the dumbass award for this one. Or, maybe dumbass is the incorrect term. I am simply ignorant of all the facts.

Yes, the 1/2" step is truly the height of the step I added. The thickness of the fan fold and basswood square piece spacer equals 1/2 inch. A Super Cub is NOT a flat wing. Guesstimating the wing thickness prior to to adding the step I would say it is close to one inch so the total is 1.5". Doing the calculation again (dividing 1.5" by 7.125" cord) equals 21%. That might explain the evil handling I was experiencing. It sure as heck wanted to climb with this configuration.

Simply adding a 1/4" (approximate) thick piece of fan fold to the plane would work. Correct? Should I taper the front leading edge of the fanfold or leaving blunt?
Now, now, now............Don't be too hard on yourself! Whenever a person is trying to learn something, sometimes there's little setbacks.

Yes, the easiest way to try this out is using a single piece of FFF. I would "round" the leading edge if possible. One of the advantages of the KF design over a flat plate or UC 'foil is a thicker leading edge. This results in less pitchyness (is that a word? ).

When adding a step to the bottom side of a UC wing, my recommendation is to adjust the step height so that IF the step were extended all the way to the trailing edge of the wing, the resulting airfoil would be the flat bottom type.

I think we're on the right track now!

Last edited by kaos2; 07-30-2007 at 03:07 PM. Reason: Additional info.
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Old 07-30-2007, 03:09 PM
  #156  
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Originally Posted by kaos2 View Post
Now, now, now............Don't be too hard on yourself! Whenever a person is trying to learn something, sometimes there's little setbacks.

Yes, the easiest way to try this out is using a single piece of FFF. I would "round" the leading edge if possible. One of the advantages of the KF design over a flat plate or UC 'foil is a thicker leading edge. This results in less pitchyness (is that a word? ).

I think we're on the right track now!
Now comes the task of removing all of the packing tape I used to install it. A fresh hobby knife blade ought to do. Removing the spacers will be easy. I did glue them on but only to the fanfold.
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Old 07-30-2007, 03:25 PM
  #157  
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Default Hijack Concern

I'm concerned that the discussion about the KF wing may be hijacking the Scratchbuilt Foamies thread. My original post was sharing a scratch built plane that I designed that utilized a KF airfoil. Lately, the discussion here seems to have focused around the KF airfoil and modifing existing designs to the KF airfoil. Do I need to start a separate KF Wing thread? Is there enough interest?

Regardless of what we do, I never intended to hijack this thread.
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Old 07-30-2007, 03:29 PM
  #158  
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Originally Posted by kaos2 View Post
I'm concerned that the discussion about the KF wing may be hijacking the Scratchbuilt Foamies thread. My original post was sharing a scratch built plane that I designed that utilized a KF airfoil. Lately, the discussion here seems to have focused around the KF airfoil and modifing existing designs to the KF airfoil. Do I need to start a separate KF Wing thread? Is there enough interest?

Regardless of what we do, I never intended to hijack this thread.
I plead guilty to the charge of hijacking, or at least a conspirator. Yes, I think a new thread for the KF wing is in order.
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Old 07-30-2007, 03:53 PM
  #159  
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http://www.youtube.com/watch?v=uVuhLJ17L08
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Old 07-30-2007, 03:54 PM
  #160  
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I've created a new thread about the KF airfoil. Anyone wishing to participate in further KF discussion, please post in the new thread. Sorry Crashalott.

Link to KF Wing thread. http://www.wattflyer.com/forums/showthread.php?t=22654
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Old 08-04-2007, 07:40 PM
  #161  
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Default Su9

WS: 15"
length:25.5"

don't ask,i don't know if it will fly but i'm going to try anyway.

i looked at the 3 View and liked the looks of it.the only prob. was that when i enlarged it,it was still too small for my taste but decided to give it a try anyway.

weight of airframe alone is 2.54oz
the set up will be:

LensRc 8T w/4x3 prop
3s540mA [email protected]
CC10 ESC
2 x 4.3g servos
Berg 4L Rx

edf40 w/ feigao ips motor might be another option for power.
let me know what you guys think,any suggestions all input is welcomed.

thnx

Angel
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Old 08-07-2007, 04:00 AM
  #162  
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or this one
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Old 08-12-2007, 04:26 AM
  #163  
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snolord1, i'm sure you'll get your Su9 flying.

here are a couple of my scratch builds... MiG-23 swing wing, Boeing 727, RFB Fantrainer and MiG-25. this MiG-23 is actually a 130% of my original MiG-23 design. i added some 'afterburners' this time around. the Boeing 727 has still yet to maiden, but i've been too busy with some other scratch projects at the moment.

-beanie
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Old 10-16-2007, 10:35 PM
  #164  
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More of a kit built than a scratch built since this was made from one of Saucerguy's P-40 kits. It's my new favorite. Now I can retire my E-Starter and build a Regal .
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Old 10-23-2007, 06:56 PM
  #165  
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Default some of my foamies

Video:

Blackwing: http://www.youtube.com/watch?v=Uq8tPBViu3U

Geobat: http://www.youtube.com/watch?v=S3ORS-E6N8o

Geobat maiden: http://www.youtube.com/watch?v=LLyk62KFYWA

Geobat elevons: http://www.youtube.com/watch?v=4tgMXHpoBZU

F117: http://www.youtube.com/watch?v=_N_lsTtn2ng
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Old 10-23-2007, 07:11 PM
  #166  
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tramp8754,

Nice videos, great looking planes. Liked the music too. The Geobat needs some strobes on it for night flying. Make sure the strobes circle the plane. Fly it at night over a Friday night high school football game and they'll be a gazillion UFO reports and probably a visit from Homeland Security.
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Old 10-29-2007, 05:20 PM
  #167  
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Flying over a Friday night high school football game did cross my mind. Look at the video again. The bright lights in the distance are just that...a high school football game.

Going to fly today. Hope to have more video posted late this evening.
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Old 10-31-2007, 03:40 PM
  #168  
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Here is my latest scratch build. A P51 Mustang from a Gene Bond plan of a profile P51 with a midwing. I changed it to a low wing with a bottom step.
The paint job i done on it was from a picture of a Voodoo Mustang i seen.


Have not done the maiden yet. Waiting for wind to die.
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Old 10-31-2007, 06:47 PM
  #169  
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Default Mini Horten foamy videos

http://www.youtube.com/watch?v=Rjp85oIAiIs

http://www.youtube.com/watch?v=kmWMNLk25jI
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Old 11-02-2007, 05:40 AM
  #170  
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http://www.youtube.com/watch?v=pbgGmfbSEO4 Splash 3D
http://www.youtube.com/watch?v=ClZQprvtFhc Pterodactyl crash

Pterodactyl has been repaired and should fly next time.

Last edited by tramp8754; 11-04-2007 at 12:51 AM.
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Old 11-02-2007, 05:56 AM
  #171  
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Originally Posted by snolord1 View Post
WS: 15"
length:25.5"

don't ask,i don't know if it will fly but i'm going to try anyway.

i looked at the 3 View and liked the looks of it.the only prob. was that when i enlarged it,it was still too small for my taste but decided to give it a try anyway.

weight of airframe alone is 2.54oz
the set up will be:

LensRc 8T w/4x3 prop
3s540mA [email protected]
CC10 ESC
2 x 4.3g servos
Berg 4L Rx

edf40 w/ feigao ips motor might be another option for power.
let me know what you guys think,any suggestions all input is welcomed.

thnx

Angel
Hi Snolord did you get your Su9 flying? I made a f16 with a 16" wing span, and used a 2500kv motor from heads up rc with a 5x3 prop and a 1000mah 3 cell lipo, my first maiden was scary, but it told me what was wrong with it and the 2nd maiden, it flew great, here is a video of it, my camera person was getting tired, as this was the second video she shot that day, so I had to trim a lot from it, enjoy, Chellie



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Old 11-02-2007, 06:06 AM
  #172  
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Hi Tramp Really nice splash 3d hydro, well done, Take care, Chellie
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Old 11-04-2007, 12:49 AM
  #173  
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Just came to me, my post #169 should not be here. Two acft there were not scratch built. Foamy, yes. Scratch, no.
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Old 11-04-2007, 05:53 AM
  #174  
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Here is the most recent pic of my current scratch built project, the Ohio Combat SRT/10. Yeah, it REALLY is that big guys!

Laine.
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Old 11-04-2007, 07:51 AM
  #175  
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There you are again Chellie. Up late past my bedtime.

Ken
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