Test Flight Flying Wing morphing Kline-Fogleman wing sections Part 2

Test Flight Flying Wing morphing Kline-Fogleman wing sections Part 2
In this video I test fly a cheap flying plank based on the Wind Freak glider
At this stage I will be the adding of the KF-2 and KF-4 One of these sections radically improved the glider :)
I am calling it the Dune Freak. My thanks to Andy Whitehead of Angelwingdesigns for his massive support and enthusiasm with this fun project.
3 Reasons
1 I would like to build a Res size plank glider
2 I have not flown a rudder /elevator flying wing
3 Experiment with Kline Fogleman

[@TheDickeroo]

Nick… Thanks for all the effort on the KF airfoils. These airfoils are primarily meant to be used with full power. That is when they work best at trapping a vortex which becomes part of the wing and gives great stability because the vortexes tend to equalize and thus maintain stability and stall resistance. KFm4 is really built for power and speed. KFm3 is best for heavy lifting. I salute you for these videos.

[@NickChittyFlying]

Thanks Dick I am honoured you have taken the time to reply. I will be adding power in the future

[@meljones7066]

I continue to follow this with great interest, once again I thank you.

[@NickChittyFlying]

Thanks Mel I will keep on with it

[@AerialWaviator]

Brilliant! Really seems to thermal well wit KFm2. Like how this series of experiments is going.
Looking forward to seeing some bungee action next? This could allow for some calm air experiments to more clearly spot differences in flight characteristics and feel.
In future, would be curious what happens if varied the step position of the KFm2 from the leading edge. Example: if moved to a 1/3, or 1/4 of cord vs. the initial 1/2 cord placement. With KFm4, might be interesting to experiment with reduced thickness. (but access to thinner foam might be a challenge)

[@NickChittyFlying]

Spot on I am convinced kfm4 is too thick

[@anthonylong601]

Thanks for filming this. Some of us are learning with you.

[@NickChittyFlying]

Definitely interesting effects on these small gliders

[@LWJCarroll]

Very interesting thanks!

[@the-rc-science-geek]

Nice experimenting Nick! Try the KFM4 against the KFM3 - otherwise you are comparing apples and bananas. The problem is, that to have comparable airfoils the number of plates should be the same. Otherwise you increase airfoil thickness by 50% - and it's quite obvious what this does to the glider performance... What's also more interesting: cover the tipp with some oracover or tape. Or try changing the centre of pressure by cutting back the step positions - like @Aerial Waviator is suggesting!

[@NickChittyFlying]

Yes I need thinner sections for kf4 but it’s all fun 🤩

[@jetplaneflyer]

Interesting. What I saw was that the KFm2 was struggling to maintain height when your friend's glider was soaring around just fine. Obviously completely different models so hard to draw any hard conclusions but I know from my own back to back testing of a DLG with a Mark Drela airfoil vs the KFM2, the Drela was vastly more efficient. The KFm has got ease of build in it's favour.

[@NickChittyFlying]

The other glider is electric. Comparing klinefogle to drela is like chitty chitty bang bang against a Ferrari 😘
Kfm is cheap fun tho 🤩

[@TitofBee]

awesome

[@NickChittyFlying]

Thanks

[@richardo212]

I really enjoyed your series of tests with the KFm sections, especially the excellent result with KFm2. FWIW (I always wanted to write that!!) it seems that the KFm4 might be the equivalent of a symmetrical airfoil and I don't know of many (if any) flying wings that use a symmetrical section. It might need a bit more reflex on the elevons and outer panels to increase the angle of attack to get it to work a bit better - but what do I know, I can't even spell aerodynamics).
It's really good when someone says, "What the heck, let's try it!"

[@NickChittyFlying]

I ve had the most fun out off a couple bits of foam 😂

[@richardo212]

@@NickChittyFlying That's what it's all about

[@1minutecomicswalahollywood648]

These wings are huge & design is different than traditional Airplanes.
Please explain.

[@AerialWaviator]

Did you ever share a reference of the laminated material you used to make the KFm airfoil wing?
Or, you planning to cover in detail in a future video? Thanks. Fascinating experiments. :)

[@NickChittyFlying]

I will drop it in next video as we have no wind and it’s bungee time 😍😍😂😂

[@AerialWaviator]

@@NickChittyFlying Awesome. Bungee experiments should be fascinating.

[@davidpiper3652]

Bungee, yeah, give that a go.

[@NickChittyFlying]

What could possibly go wrong 😂😍

[@davidpiper3652]

@@NickChittyFlying claps hands above head ...

[@NickChittyFlying]

@@davidpiper3652 time will tell 😂

[@DavePinnock]

Hey Nick, great video. I made a KFM40 flying wing which also uses the KFM4, was rubbish as a slope soarer though, just seemed too draggy. Like you say though, almost impossible to stall, could land with back elevator and just land with a plop :)

[@Tsnafu]

I did the same, the Trond KFM4, nice plane under power but didn't have much of a glide slope - KFM's are renowned for their non-existent stall

[@NickChittyFlying]

I was stunned by kf2 performance but I have theory about the 4

[@NickChittyFlying]

Yer not impressed with 4

[@DavePinnock]

@@Tsnafu Yeah you wouldn't want to run out of power and try and glide home with a KFM4 :) I did enjoy my scratch building, just don't fly enough any more :-/

[@StrangerInAStrange]

Good Morning from across the pond! Are there plans someplace for that little plank? It looks like it would make a good 'travel sloper'. Cheers!

[@NickChittyFlying]

I will get a pdf sorted mate

[@StrangerInAStrange]

@@NickChittyFlying Thanks Nick!

[@docwunder1628]

Wow! The second version flies really good. So why airfoil? Not important for a slowflyer. 👍👍👍

[@NickChittyFlying]

Just a bit of fun experimenting 😍