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Old Dec 01, 2008, 03:05 PM
MINUS (-)
jsfrench's Avatar
United States, WA, Olympia
Joined Nov 2002
179 Posts
Contest
Scratch-Build-Off 3 1/28 scale 7 engine bomber, Kalinin K-7

My entry is the Kalinin K-7 at 1/28 scale
wing span = 173.9 feet = 2086.6 inches
1:28 scale = 74 inch wing span, 60mm crew members

Russian 7 engine bomber, last flew in 1933, more information here:
short description:
http://en.wikipedia.org/wiki/Kalinin_K-7
more information:
http://www.aviation.ru/k7/k7giant.html

Since the fuselage is mostly wing, I decided to use the original airfoil.
According to http://www.public.iastate.edu/~akmit...foil_usage.htm
the airfoil is TsAGI R-II.

I decided to just trace the airfoil in CorelDraw, bring it into Profili as DXF,export as *.dat to Compufoil. (Thanks to Milhafre and Vintage1 for CorelDraw training)

The Wing and horizontal Stab both have a constant chord main section with an elliptical outer panel.

Compufoil constructs elliptical wings with just the root chord and half span as inputs, so it is not necessary to draw a plan of the wing beforehand.

I am still trying to improve my skills with CAD, so my entry will be mostly CAD with maybe enough time for the build.
John
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Old Dec 01, 2008, 03:11 PM
a.k.a Maltone
Australia, NSW, Goulburn
Joined Jan 2005
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Intriguing subject John - dare I say a challenger in the ugly stakes?

Pat
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Old Dec 01, 2008, 03:33 PM
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CapMike's Avatar
USA, CT, Shelton
Joined Jan 2008
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that is one strange bird. And 7 motors turning is gonna take a lot of batteries.
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Old Dec 01, 2008, 03:45 PM
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RyanPSU21's Avatar
USA, MI, Harrison Township
Joined Sep 2000
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That is one interesting looking one for sure.
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Old Dec 01, 2008, 04:14 PM
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CapMike's Avatar
USA, CT, Shelton
Joined Jan 2008
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Pat I cant figure which one is uglier. someone flip a coin
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Old Dec 01, 2008, 04:30 PM
Two left thumbs
Muncie, IN
Joined Sep 2006
4,233 Posts
I think the Bison's uglier, but the Kalinin is like a caricature of a plane. I kinda expect to see Donald Duck and Mickey mouse pop out of it, followed by the seven dwarfs - one to man each engine!

Geoff
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Last edited by GeoffinIN; Dec 01, 2008 at 06:59 PM.
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Old Dec 01, 2008, 06:18 PM
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Longhorne's Avatar
Sonoma County CA!
Joined Jul 2007
1,336 Posts
Geoff--you're right. I found Mickey!

John--that's a heck of a wing section.

Good luck with it,

Paul
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Old Dec 01, 2008, 06:59 PM
Two left thumbs
Muncie, IN
Joined Sep 2006
4,233 Posts
Quote:
Originally Posted by Longhorne
Geoff--you're right. I found Mickey!


Paul
Да, очень хорошо!
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Old Dec 01, 2008, 07:49 PM
It actually Flies!
Float Flyer's Avatar
Salmon Arm, British Columbia, Canada
Joined Feb 2006
548 Posts
Fantastic subject! It has been on my list of "Want to" for a while as well.

I lover the Habitrail tunnels from the gear platform to the upper decks.

Love to see this one come together.

FF
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Old Dec 01, 2008, 08:33 PM
MINUS (-)
jsfrench's Avatar
United States, WA, Olympia
Joined Nov 2002
179 Posts
guys thanks for the coments.

Maltone:
Pat, The Bison is well ahead in the challenged appearance contest.

CapMike:
Mike, I'm planning on 8 pounds weight with 700 watts of motor. I have a set of 3s 8400 MA batteries for power. I was thinking of having the one pusher at 300 watts and then six 70 ish watt motors.

RyanPSU21:
Ryan, Like the Chinese say "live in interesting times?

Longhorne:
Paul, I knew there was something familiar about that cross section.

Geoffinpdx:
Geoff, Just trying something different, I was considering the Burnelli.

Float Flyer:
Darryl, Maybe put some gerbils in there?

John
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Old Dec 08, 2008, 02:55 PM
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United States, WA, Olympia
Joined Nov 2002
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Some progress, additional work on wing, added booms.
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Old Dec 08, 2008, 06:03 PM
Two left thumbs
Muncie, IN
Joined Sep 2006
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Ohhhhh, that 3D CAD work is beautiful! And I'm glad to see you've got a mascot to help things along!

Geoff
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Old Dec 09, 2008, 02:55 AM
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mountainman2442's Avatar
El Paso, Illinois
Joined Apr 2006
725 Posts
John,

Great prototype! You've got me hooked and subscribed! The bigger and uglier, the better...

I see your point on the airfoil. You really little choice since it is such a large part of the character of the airplane. Any more appropriate shape would result in a very unscale-like appearance.

John
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Old Dec 15, 2008, 11:55 AM
MINUS (-)
jsfrench's Avatar
United States, WA, Olympia
Joined Nov 2002
179 Posts
Geoff, John Thanks, I am still trying to get the hang of the 3D CAD, I spend most of my time making changes. I won't get much done for a while, lots of honey-do, etc.
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Old Dec 15, 2008, 02:53 PM
frenzyscot
Dundee, Scotland
Joined Oct 2004
652 Posts
no words

... how long did that take you?

bravo !!!
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