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earthsciteach's STOL Build for the "Contest"

earthsciteach

Moderator
Moderator
#1
Contest thread is here.

http://forum.flitetest.com/showthread.php?4445-CONTEST!!!!-Build-a-STOL-Bush-Plane

I'm off and running on the design of an STOL scratchbuilt for Monkey's, "We're all Winners Here," contest. First, a couple of sketches. I'm a fan of the Kitfox kit builds, so I'm going with that as my airframe. Nice looking plane. http://www.kitfoxaircraft.com
STOL plane sketch.jpg
Quick hand-sketch

I'm going with a fairly high-cambered, thick airfoil with leading edge slats. I was originally considering fowler flaps, but may just go with flaperons as the Kitfox does. I'll hot wire the wing from XPS foam.
STOL airfoil sketch.jpg
Airfoil rough sketch

Specs:
Wingspan - 48"
Length - 30.75"
Chord - 6.5" (may increase)
Cabin width - 5-6"

Motor - 450 Slofly (2836-09)
Prop - APC 11x5.5
ESC - 20 to 30 amp.
Battery - 3 cell

I have a stack of Dollar Tree foam board and enough to get moving on it.
 

earthsciteach

Moderator
Moderator
#2
AAARRRGGHHH!!!! Bastards didn't publish scale 3 view drawings. Hard to get the details right with this nonsense. Oh well, I'll use creative license.
 

earthsciteach

Moderator
Moderator
#7
Thanks for those, FM! Very nice.

I'm still chewing on the idea of self-deploying leading edge slats. I know its not worth the effort, but it'd be pretty darned cool.
 

Liemavick

Member
Mentor
#8
Come on teach, grab a pencil and a ruler and start drawing. Fred said it only had to fly or crash to win LOL I can honestly say Ive never designed a plane starting with the scale of wheels I have on hand.
 

earthsciteach

Moderator
Moderator
#9
I'm putting pencil to foam board! Had to take a break for the night, though. You are definitely way ahead of me. I just dropped my power system into my shopping cart at Headsuphobby.com. I don't think I have any xps on hand, either, so the wings will have to wait until I can grab some. I should have the fuse mostly done tomorrow.
 

Liemavick

Member
Mentor
#11
Im thinking of launching mine off a tall building so I get some air time. This thing is going to be interesting, I think the CG is about 3" in front of the prop LOL
 

earthsciteach

Moderator
Moderator
#14
Fuselage almost ready to be cut out

After a lot of scaling of tiny 3-view drawings of the Kitfox I have started to lay out the lines of the plane. This pic shows the cut and fold lines of the fuselage from the position of the firewall back.

I'm going to fabricate a cowling for the plane. I thought I was in luck and would be able to use the form I made a while back for making my own for my HZ Super Cub, but the Cubby, being a tandem seater, is too narrow. Not sure if I'm going to carve it out of foam and glass it or just carve a form and heat shrink a soda bottle.

I think I've worked out a clever way to make out the leading edge slats by heating and vacuum forming ABS plastic over dowel rods. I may give those a trial run and see how they turn out, later today. I'm still not sure what material I want to use for the flaperons as they hang below and behind the wing. I may just go the easy route and sand some balsa into an airfoil shape. Maybe something more clever will come to me in the meantime.
 

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earthsciteach

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Moderator
#15
The fuse is pretty much together. I still need to bulk up the firewall, though. I'm also planning on cutting out the windows and covering in a transparent material, such as overhead projector film. The lines of the Kitfox are quite boxy making it an easy plane to model with foam board

I'm running to Home Depot to get XPS foam to hot wire the wings in a bit. In the meantime, I'll lay out and cut the tail surfaces. I'll update with pics when I get those installed.
 

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earthsciteach

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Moderator
#19
Ha ha! Yeah. Used to be able to get it at Office Max or similar stores. But, overhead projectors have gone the way of the dinosaurs. I have a beautiful Epson projector hanging from the ceiling in my classroom.

On a side note, the "base" (where the film lays) on an overhead projector is a 12" x 12" fresnel lens that makes an amazing fire-starter magnifying glass! I tear the old ones apart for those.
 

Liemavick

Member
Mentor
#20
Ha ha! Yeah. Used to be able to get it at Office Max or similar stores. But, overhead projectors have gone the way of the dinosaurs. I have a beautiful Epson projector hanging from the ceiling in my classroom.

On a side note, the "base" (where the film lays) on an overhead projector is a 12" x 12" fresnel lens that makes an amazing fire-starter magnifying glass! I tear the old ones apart for those.
Now your talking my lingo! Fire good, Fire pretty! More Fire! If you find yourself with one to many of those fresnel lens, send it my way please, I'll gladly pay :) Have I ever mentioned how well dryer lint catches fire? (FM you squirming yet?)