Added an example version of my 1st wing design for 3D printing

AMX 3D printable prototype photos

Did not know anything about "Kline-Fogleman" airfoils when I created it.
The inspiration behind the paper plane "Seagull" or "Maaken" in Norwegian
came from a paper plane called "Deltry" or something similar.

BTW: It's the only paper plane I know about that are able to loop!

If others ave similar planes please share!

Attached how to fold the Seagull paper plane.

See attached files:
SA_A4_thrusttube_L=210mm.PDF
(The original drawing is in ACAD format hidden in the .ZIP file)

How to make the thrust tube
Print it out on a paper or direct on a plastic film if possible.
Cut film/paper tac glued together with scissors
Fold as shown
Glue or use tape to lock thrust tube fold

Install in A4 plane (the difficult part)
I had to cut slices in the efflux exit to get the thrust tube
straight and aligned. See photos

Image for a forum post

Long time since I wrote anything in my blog. Some Years ago when I mainly flew propeller planes
I bought 4 kits from "Sonic Model" also sold as Hype in Europe. Recently I discovered that these planes
still was sold under the name Nicesky. Wingspan 680mm approx 26" so they are not park size models.

The 4 kits were: Hurricane, Focke Wulf 190, P-47 Thunderbolt and a P-51D Mustang.

The Hurricane went into the bin pretty early it was a awful flew like a dog, foam crappy it was simply junk

Then I assembled the FW-190 struggled a bit to get the COG correct but managed it. That one is just
brilliant it almost flies like a Focke Wulf FW-190 it's just amazing!

For some weeks ago I started to assemble the P-47, flew it today (early morning no wind) with a E-flite 9x4,7 prop.
The prop is a bit too big for the plane I will try an APC 8x4,7SF or similar later.

Update
Could not find any 8x4,7 in my stock pile so I went for APC 8x6SF and that made the day!
Need to increase rudder throw ...

Nicesky_P-47_680mm_wingspan (2 min 14 sec)

Some photos for a pal

Long time since I updated my blog. Mostly flown RTF planes no time for own
designs.

Since the Kyosho EDF's are discontinued products, modifications
may have a limited interest therefore I decided to do a blog entries
instead of a new threads in Foamy EDF's.

Link to my Kyosho A-6 Intruder thread
https://www.rcgroups.com/forums/show...ight=kyosho+a6

After I successfully had modified the A-6 I found a cheap Kyosho F-4 with
a similar split duct. After some testing I found that the split ducting in the F-4 was not realy a big problem as it was in the A-6.

Link to old F-4 threads
https://www.rcgroups.com/forums/show...ght=kyosho+f+4
https://www.rcgroups.com/forums/show...ght=kyosho+f+4
https://www.rcgroups.com/forums/show...ght=kyosho+f+4

Main problem with the F-4 is the CG. To get a perfect CG servos has to be moved see photo.

Also the fuselage is not realy well built see mod of reinfocement/inlet ducting.

All up weight with 1000mah 3S 35C LiPo about 415g. Thrust with non stock
Haoye Ø55x42 fan 420g

On wheels

Depron sort of Airco DH-2 (0 min 52 sec)

On floats

RC Plane 'DH-2' on floats (0 min 31 sec)

...Continue Reading

My Depron 'Airco DH-2' in PDF format.
Depron_DH-2_v3_E4.pdf contains a A1 assembly drawing
The other files are the Depron and wood parts....Continue Reading

Made a english version my "famous" Depron kind of 'Airco DH-2'
in scale 1:12 drawings.

The upload is a CAD file in ACAC R12 DXF format.
There is both an assembly drawing in A1 and parts in A4 size
No need to print out the A1 since it is more a how to put
everything together drawing.

It's a rewarding little plane for fun flying. Well suited for beginners
too I believe since it's a pusher.

It's also possible to customize it with e.g. floats.

Before my summer vacation on a mountain hike I stumbled over
some rubbish on a car park. Picking it up and on my way to a
disposal bin I realized this green flat band could indeed be used
to something useful! It was quit stiff and strong maybe it could
be used as a carbon replacement on my Depron plane designs.

Some time later made my idea reality see PET-strap photo
of my first sort of 'DH-2 plane ... it worked no problem but
it wasn't perfect. A bit heavy and after a crash wings was
bent.

Later I found another type of straps called PP-straps infact
I've seen these many times and has disposed them as junk
after unwrapping cargo. PP-straps are much lighter and the fiber
reinforcement make them much more like thin Carbon strips.
Used them on my improved DH-2 see PP-strap photo.
They are not as stiff as carbon used flat like shown.

Recently I've experiemnted more with PP-straps and bent
them int their longtitude in L and U forms then suddenly
it looks like they become just as stiff as Carbon ... have
to make a plane to prove it but I'm pretty sure it will work!

Note
PP-straps may be glued on with a various types of glue. I've used
contact glue UHU por, Hot glue (low temp) and recently
Polyurethan (humid activated). I've not tested foam friendly
CA yet but I doubt that it will be any problems.

I finaly convinced my self to publish first version of
my design Depron 'DH-2' in scale 1:12

Technical:
Wingspan: 720mm ~28"
Weight: 225-250g 8-10oz
Wing area: 1570 sq.cm
Motor: 70-80W (25g)
Battery: 3S450Mah 20C (45g)
Servos: Rudder, Elevator, 5g (HXT500)
Aileron 9g (HXT900 or better)
Reciever: 4ch (10g)

It has it's vices it's not a very energy efficient pusher
yet but it's a funny and tough little plane built for
rough flying. Bushes be warned

Practical: Be sure You get the line of thrust correct it should
be paralell to the wings, no side or down thrust.
CG middle of wing or more forward. Safe start 1/3 from
leading edge. Land with thrust this is NOT a glider!

Made a 3D model of my Depron Airco DH-2 in scale 1:12

The plane is built and test flown. CG 40mm from
front edge of wings.

Hopefully somebody may find this useful even if
it's not a exact scale. In my view it may prove
to be a useful aileron biplan trainer with almost 3D
capabilites. Used 5g servos on elevator and rudder,
one 9g on the ailerons.

I may provide a drawing later need some more time
to do it "complete"

Note: The 3D model is in ACIS format (.SAT extension)
there are free viewers for this available.

Some pix of my 'designs' protoypes as usual.
Need some bad weather to get the designs
finished.

Should have published several designs but time and patience
has not been there ... I'm recently working on a micro Airco DH2
but it's still too heavy.

Update:
I've put the micro DH-2 on hold an scaled it up to 1:12 with
a 724mm (~28.5) wing span. I've built it as strong and with
cheap materials as possible. No carbon, no paint, cheapest
possible lightweight brushless, cheap LiPo. Why? I hope it will
become a rugged and very useful trainer for some kid's in
the summer vacation.

Hopefully I may fly it's maiden this evening.

Update 2:

Yes it flew ! or more correctly it hoovered into the air!
Funniest plane I've ever flown. Slow ... I could almost walk
alongside! I just taped a LiPo on the front fuselage so I got
to make a battery bay tonight ...

Finaly got the drawings ready. I did not provide
a drawing where to locate servos and stuff since
that is more up to what You got available.

The plane is made of 3mm Depron or Kapron
about a half sheet approx 600x850mm
2 Carbon strips 3x0.5mm L=600-700mm

1 Piano wire 1.5 or 2.0mm L=600-700mm
2 wheels with dia 50mm

This plane is REALY a slow flier! You may increase
the aileron sizes to get faster / better roll.

Hope somebody may find it useful ...

Some Updates:
Tested it with a APC 7x5E prop today it worked but it
was too cold and too late (too dark) to do much flying.

I may build another one to investigate where CG should be
this weekend.

I will get a new light weight motor 19g, servos 3.7g and a
2S 460mah 28g battery soon. So I hope to make one hopefully
slightly lighter with a 8x4SF prop.

May be I should not write this but ...
This plane realy surprises me with how well it performs and
I'm pretty sure it's not my "experience" as a model plane
designer who did it. The original layout and design must
have been excelent, even if it was outdated already at
the drawing table back in the mid 30's.

Made my Gloster Gladiator ready for first flight 14 days ago.

First flight went pretty well on a stadium with flow lights in
a temperature below zero (Celsius). Landing gear snapped off
of course ... bad workmanship (me).

Later I flew a second flight without the landing gear on a
grass field. In the part dakness I hit a fence and broke the
front fuselage (crashing a Depron plane on tarmac road is
not recomended)

Repaired and reinforced the front fuselage and had some
realy pleasant flights today. The plane is a bit nose heavy
but for me that's fine. I was afraid it would be the oposite.

It's now 200g as I was afraid of but to my surprise it's
flying like a dream. Slow flights no problem I'm using a
Brushless: Nippy N29 Silver - 7A172 approx 24g
Prop: GWS 7035 (7 x 3.5)
LiPo: Hyperion LCL 3S 26C Pack - 350mah weight 37g
LiPo: Hextronik 460mah weight 42g
ESC: Some 12A weight 10g
Servos: 4 off 4.7g
RX: Wfly 6ch 10g

The roll rate is low since it has scale size ailerons.
A drawing will be published as soon as I got the
reinforcements updated and outfitting sketched in.

Here is the result of my effort trying to build my own "design"

Had to add some stiffeners to the tail fuselage. I will add them to the
3D modell see below and later the drawing. Weight about 50g so far
had calculated it to be approx 40g for the depron so only 10g added
in carbon, tape and glue. Wingspan 700mm (27.5"). I hope to keep
the weight down under 200g. Ideal 150g but with a piano wire landing
gear and it will most likely become closer to 200g.

Many years ago I built a scale Gloster Gladiator in balsa from some
a free flight drawings. Tried to convert it to control line with a 2.5qcm
Fox glow engine but failed, it never flew. I gave up balsa and glow
engines far too much mess, smell and noise. Some years ago I found
the drawing during a clean up and thought I will never ever build that
again so trew it in the bin.

Now after discovering brushless motors and LiPo's I regreted
that I threw away that drawing But there is still hope maybe
I'm able to design one from the ground up at least I've made
a Depron profile version to start with.

If You got a ACIS .sat file viewer You might take a look at my
current version.