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Mar 18, 2015, 05:14 AM
circle flyer
slow and low's Avatar
Quote:
Originally Posted by Dukejet
Looks photo-shopped, IMHO

It is just a great photo taken by his daughter. He has an interesting build thread below, NOT SO SIMPLE b-17.
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Mar 18, 2015, 05:21 AM
Careful,.. confident,.. CRASH!
Dukejet's Avatar
Yeah thanks bud, I've had a look at the build. the photo is a "trick of the light", looks very different than what we are used to seeing. My bad....
Mar 18, 2015, 07:45 AM
Registered User
Sr71freak's Avatar
Wow, that was a fun read! LoL. I don’t take any of the comments as harsh. I build fast and loose, fly the crap out of them and normally move on. Oddly these bombers have sucked me in so hard that I have been building nothing but B-17’s for nearly a year.
It does actually have a leading edge, and I’ll admit that I eyeballed the kf step instead of ding the math. But this one actually flies pretty well. I built two of these, and for some reason this one flies better than the other.
As for the picture, YA it looks strange, but it best showed the wing type so I used that one in this thread. I have a lot of other pics my little girl took in my other thread. She is indeed a natural.
Here are both my planes at the field Monday.
Mar 18, 2015, 08:34 AM
Build straight - Fly twisty
Whiskers's Avatar
Dukejet, Yep, I've seen many a lorikeet hurtling through the trees. Those birds effortlessly stamp out any arrogance we may have about how well we fly.
Mar 18, 2015, 09:05 AM
Build straight - Fly twisty
Whiskers's Avatar
Quote: It does actually have a leading edge
Yes, when I freeze the frame I can see that you have beveled the top "slab."
Again I must repeat, my "looks horrible" refers only to the airfoil when compared to what we had come to believe a wing section should look like.
On the subject of model wings doing what seems better than expected: I have just watched a video of a guy flying a plane with a wing made from a single thickness of foam that had been formed into a robustly cambered section. Not only did he fly the thing inverted but he also made it fly an outside loop.
It's hard to apply either Bernoulli or Newton theory to that.
Mar 18, 2015, 09:33 AM
Registered User
davereap's Avatar
I am flying two models made from 1" builders foam with simple flat chamfers cut in... with a serrated carving knife.. two chamfers at the front for a symmetrical section and a single one at the rear.. with flat/square 12mm leading and trailing edges...so there is plenty of drag on that leading edge...

their only fault is the poor foam, its not only softer than depron, its also heavier.. so there wont be long term durability..
Flying them is not a problem...

They are based on the RM section (by RustyMustard)...
They fly great... You've seen the designs recently redrawn and posted here for a KFm4 build.. which is the way I should have built them...
Like 4bangen I use a 3536 motor but at 1050kv with a 11x7 prop ... plenty of thrust and very quiet
they are about 33-35oz and go vertical on this setup..
no Bernoulli, but plenty of Newtons to overpower the drag from less than perfect sections.....
basic crude , cheap models... that's the benefit of all foam builds.. good fun for little outlay

video...
overcoming drag is simple... overpower the model....
.
PP1 with 3536 and 11x7SF prop on 3s 2200 2 17 03 2015 (8 min 41 sec)
Last edited by davereap; Mar 18, 2015 at 09:59 AM.
Mar 18, 2015, 10:15 AM
Careful,.. confident,.. CRASH!
Dukejet's Avatar
Well done mate, fly's nice! Though I think with that power set-up you could get a brick to fly...lol. good job.

Question posted in another thread about painting foam - depron - I think I've found some paint that MAY work..... well I'm going to have a look tomorrow, it's called 'duplicolor vinyl and fabric'. not many options here for foam compatible paint. Anyone had experience with this stuff??
Mar 18, 2015, 10:31 AM
Registered User
Sr71freak's Avatar
Quote:
Originally Posted by Whiskers
Quote: It does actually have a leading edge
Yes, when I freeze the frame I can see that you have beveled the top "slab."
Again I must repeat, my "looks horrible" refers only to the airfoil when compared to what we had come to believe a wing section should look like.
On the subject of model wings doing what seems better than expected: I have just watched a video of a guy flying a plane with a wing made from a single thickness of foam that had been formed into a robustly cambered section. Not only did he fly the thing inverted but he also made it fly an outside loop.
It's hard to apply either Bernoulli or Newton theory to that.
I fallow the, if you put a big enough motor on it a rock will fly. lol
I am getting more into foils and stuff, just trying not to take my stuff to seriously so it stays fun and playful. If I pile one of these in the dirt, I don't get upset, in fact the only time I'll even be sad is if I didn't get it on film!
Mar 18, 2015, 10:59 AM
Reap the wild wind
headlessagain's Avatar
Quote:
Originally Posted by Dukejet
Well done mate, fly's nice! Though I think with that power set-up you could get a brick to fly...lol. good job.

Question posted in another thread about painting foam - depron - I think I've found some paint that MAY work..... well I'm going to have a look tomorrow, it's called 'duplicolor vinyl and fabric'. not many options here for foam compatible paint. Anyone had experience with this stuff??
Try a craft shop to see if they stock little pots of acrylic brush on paint. It's safe to use on all types of foam and brushes clean in water. I would imaging that you could thin it down and use an airbrush if you have one.
This how my mini depron FW-190 turned out
Andy
Mar 18, 2015, 04:28 PM
Jack
jackerbes's Avatar
Thread OP
Quote:
Originally Posted by Whiskers
Dukejet, Yep, I've seen many a lorikeet hurtling through the trees. Those birds effortlessly stamp out any arrogance we may have about how well we fly.
Yeah but they can't walk worth a darn! It is a tradeoff I guess....

Jack
Mar 18, 2015, 05:17 PM
Build straight - Fly twisty
Whiskers's Avatar
Quote:
Originally Posted by jackerbes
Yeah but they can't walk worth a darn! It is a tradeoff I guess....

Jack
Aint that the truth...
Mar 19, 2015, 05:01 AM
Registered User
davereap's Avatar
Quote:
Originally Posted by 4bangen
I fallow the, if you put a big enough motor on it a rock will fly. lol
I am getting more into foils and stuff, just trying not to take my stuff to seriously so it stays fun and playful. If I pile one of these in the dirt, I don't get upset, in fact the only time I'll even be sad is if I didn't get it on film!
absolutely....
and if you put three motors on it you've got a tri-copter...lol..
low cost, good fliers, that's what foamies and KF wings are about..
we can try anything for a minimum outlay.. and surprisingly 99% work very well...
and that odd 1%.. is likely to be something really special..
Mar 19, 2015, 06:08 AM
What could possibly go wrong?
nickchud's Avatar
+1 to that...

Mar 21, 2015, 06:38 AM
Careful,.. confident,.. CRASH!
Dukejet's Avatar

Lorikeet Racer


Made from meat pack depron. Funfighter motor, spinner 5x5prop, 30amp ESC, 1000mAh 4s.
840mm-w/s
Length-620mm
Controls -ailerons an elevator.
Maiden in the morning. .
Mar 21, 2015, 07:17 AM
Build straight - Fly twisty
Whiskers's Avatar
The horizontal tail area looks dangerously small to me and I expect it to be very hard to fly.
I hope I'm wrong...
Shoot some video.


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