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This thread is privately moderated by jackerbes, who may elect to delete unwanted replies.
Sep 26, 2018, 11:54 PM
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davereap's Avatar
COG no problem... you can find it using sketchup....

one wing, or as many wings as you like, its calculated as a percentage of the total horizontal areas and is an easy process....

I work on 20% and 25% areas... 22.5 % always is fine for flying...

for 3D models the same method is used on the vertical areas and the same %ages also apply
Last edited by davereap; Nov 06, 2018 at 08:38 PM.
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Sep 27, 2018, 05:10 AM
Careful,.. confident,.. CRASH!
Dukejet's Avatar
Agree Dav....
Finding a long grass field helps to keep it from looking ugly
Sep 27, 2018, 08:11 AM
I Look, Listen, and Learn
Timbo383's Avatar
Originally Posted by Dukejet
Agree Dav....
Finding a long grass field helps to keep it from looking ugly
Funny you mention that. Flew the maiden of my recent build over a small field of tall grass...lots of rain these past two weeks... and it crashed on the only bare spot in the field.Oh and it also looks ugly now.
Last edited by Timbo383; Sep 27, 2018 at 04:00 PM.
Sep 27, 2018, 01:11 PM
jackerbes's Avatar
Thread OP
That only happens when you are not holding your mouth right...

When I want a test glide I do a chest high level push/launch with elevator and ailerons leveled and use enough arm speed to get it up close to a landing speed. And look for a steady level descent to the ground.

If that looks about right, I add a little power and do it again hoping for a continuous low level flight.

I almost always have used my CG stand at home and know that the CG is realistic or close to right if I know the location

Sep 27, 2018, 08:46 PM
Registered User
projects a getting cleaned up so my blitz is getting closer
Nov 01, 2018, 08:24 PM
flyin' fool
goldguy's Avatar
Have built this design with the KFm2 and the 4. Both fly the same, including inverted, except the 2 is lighter, so flies better.
Nov 09, 2018, 09:30 AM
I am doing some studies (CFD and hopefully Experimental) on KF-airfoils and development surrounding this type of airfoil for small UAS (let's be honest, pretty much just foamies for fun). In this thread I am discussing my current method for developing the airfoils in CAD for mass-producing slight variations for testing. If you are interested in following, or giving input, see here:
Nov 14, 2018, 02:42 PM
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Sr71freak's Avatar
12ft KFm3 bus is no more. Put it in combat at Flitefest Texas a few weeks ago. New one airframe was already in the works so version 3 will debut soon.

off to meet her fait. by this point both axles where broken, two wheels where missing, and her nose and battery tray was mostly duct tape.

me and my new friend (the guy who took down the bus)

that's his propeller that got stuck in my wing, still can't believe that little plane brought down the 12x9 foot airplane. lol

it made a glorious sound when it went in nose first at full power!

so much carnage.

Nov 14, 2018, 08:14 PM
I Look, Listen, and Learn
Timbo383's Avatar
Aw man, I wanted to attend flight fest but work interfered, looks like I missed out on the fun. It's good when you can laugh about a destruction of a plane.
Nov 14, 2018, 10:14 PM
Too old to rock-n-roll...
TooJung2Die's Avatar
Go big or go home. Or go home in a couple of garbage bags. That must've been awesome.
Nov 15, 2018, 11:52 AM
Registered User
Sr71freak's Avatar
It was, there's video out there, I find some for ya.
Nov 15, 2018, 03:41 PM
flyin' fool
goldguy's Avatar
If your not breaking foam, your not having fun.

WOW, that's a lot of fun all at once.
Nov 15, 2018, 03:53 PM
"long stretch of water..."
coongoola's Avatar
Originally Posted by Sr71freak
It was, there's video out there, I find some for ya.
I've seen video of it a while back. I'll see if I can work out where it was.

Nov 15, 2018, 05:31 PM
Registered User
Sr71freak's Avatar
School Bus Down (9 min 19 sec)

Nov 15, 2018, 05:49 PM
Out Standing In The Field
RexGalore's Avatar
At 3:00, but the bus stayed up longer than the attacker did - bus wins!

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