** Kline-Fogleman (KFm) Airfoils - Building/Flying Discussion ** - Page 653 - RC Groups
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Jul 10, 2018, 03:24 PM
Planes are for trix
tiretrax's Avatar
I need one of those to charge my car.
Great looking design.
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Jul 10, 2018, 03:25 PM
Registered User
Dickeroo's Avatar
Here is an interesting comparison between a propeller and trapped vortex.

Der Vergleich: ElvWiS vs HAWT (5 min 31 sec)
Jul 10, 2018, 05:25 PM
I Look, Listen, and Learn
Timbo383's Avatar
Quote:
Originally Posted by Dickeroo
Here is an interesting comparison between a propeller and trapped vortex.

https://www.youtube.com/watch?v=TbuXhpfI-SY
I'm not saying that the trapped vortex doesnt work well, it apparently dose, but that propeller looks a little odd. Wondering if they tweeked it to make the vortex fan look better in comparison.
Jul 13, 2018, 12:09 PM
scratchbuilder
Thomas B.'s Avatar

Pseudo Scale Sikorsky S 39


The Sikorsky S39 caught my eye and I made a pseudo-scale KFm2 version. I am very pleased with the result. First and second flight in gusty wind went well, then it showed surprising aerobatic performance in flight 3 with better conditions. Great fun. Looks weird flying inverted.
Sikorsky Prototyp (2 min 30 sec)

Sikorsky S 39 Flugboot Kunstflug (1 min 0 sec)
Jul 13, 2018, 01:06 PM
skumgummi dave
Thomas B.:

Well done sir. My favorite aircraft.

Dave-
Jul 13, 2018, 02:52 PM
Planes are for trix
tiretrax's Avatar
Thomas, what a cool plane!
I'd be doing 'skip and goes all day!
Jul 13, 2018, 03:07 PM
Registered User
Sr71freak's Avatar
My newest KF airplane, this one is just a 2. but it should be a fun one.


Jul 13, 2018, 04:36 PM
Registered User
Gregco10's Avatar
Looks great SR71! What will propel the ..... Antonov is it?
Jul 13, 2018, 05:29 PM
Registered User
Dickeroo's Avatar
You might want to add small winglets to the wing tips to fence in the airflow.
Jul 13, 2018, 07:17 PM
flyin' fool
goldguy's Avatar
Thomas:

Looks like ANOTHER winner. Been flying the heck out of your Duck, Shrimp, Trottel and Fung Fu. Need a new favorite. Plan please.

Thanks for all the fun: Frank
Jul 13, 2018, 11:29 PM
Registered User
davereap's Avatar
Thomas makes another small beauty... well done
Jul 14, 2018, 10:51 AM
Registered User
Sr71freak's Avatar
Quote:
Originally Posted by Gregco10
Looks great SR71! What will propel the ..... Antonov is it?
It's a mutt. part B-52, part Antonov, and then other mods to make it work for my goals.
It's going to be a twin pusher off the back of the wing.

Quote:
Originally Posted by Dickeroo
You might want to add small winglets to the wing tips to fence in the airflow.
I may. We will see how she maidens.
Last edited by Sr71freak; Jul 14, 2018 at 11:10 AM.
Jul 14, 2018, 12:40 PM
gpw
gpw
“There’s no place like Foam”
gpw's Avatar
Video if you can !!!
Latest blog entry: Lost plans
Jul 14, 2018, 03:31 PM
"long stretch of water..."
coongoola's Avatar
Quote:
Originally Posted by gpw
Video if you can !!!
Second that!! Video required pls.

Pat
Jul 14, 2018, 04:40 PM
Registered User
Dickeroo's Avatar
[QUOTE=Sr71freak;39933741]My newest KF airplane, this one is just a 2. but it should be a fun one.

Sr71freak....

If possible, could you round off the leading edge of the wings? Right now they look flat and that would increase the drag and make the airfoil work harder. I noticed that you added a KF to the stabilizer which will help lift the rear end. A nice idea. Have a great maiden flight.


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