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Old Mar 06, 2010, 12:37 PM
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ultralajt's Avatar
Ljubljana Brnik, Slovenia
Joined Sep 2004
1,246 Posts
Build Log
GUPPY MicroSloper

Hi!

I decided to build a smaller and modified version of Guppy model, for the slopes.

It is GUPPY MicroSloper

Some data:

Wing span: 120cm (~47")
Wing area: 13,4 dm2 (~207 sq")
Length: 69 cm (~27")
Controls: aileron, elevator

Description of construction:

Wing will be made from balsa. First third of the chord will be carved from solid hard balsa and rest is allmost "normal" design... fat ribs, rear "spar" and solid balsa triangular section balsa ailerons.
Wing with shallow dihedral, maintained with plywood inserts at root.

Fuselage is of "pod and boom" type. Boom is ordinary carbon tube 6/4mm.
Pod is a plywood structure. It takes all the beating, while outer skin made from wacuum baged plastic is just for the shape.

Vertical tail is a strong structure, made from thin plywood skin and some plywood internals. There is a bracket inside the fin at its rood, that helps tto transfer elevator servo pushrods movements upright to the elevator itself.
As model is rather small, simple bended pushrod ( as found on older Guppy and Guppy 2) will produce excesive friction and allow some freeplay on teh elevator. We dont want freeplay on the fast flying slope glider.

Horizontal tail is made from solid balsa sheet. It concict some parts with different grain orientation in order to be stiff in torsion..warping free elevator.

O.K., enough of talking, let see the building of the model!

Initial design:


Computer rendering of the initial design.


Computer rendering, shown basic parts of the glider.



Testing the solid balsa carving:


Initial test...not yet the proper foil section....

Proper tool


Result of testing proper tool. Upper surface made by a tool, bottom surface sanded by hand.

Fuselage assembly:


Plywood parts..birch.


Fuselage basic structure assembly...


Fuselage sides glued to the rear part and main former.


Front end formers...belly up view.


Tail boom placement (temporary inserted.. it will be glued later in the assembly process)


Basic fuselage structure finished. Testing of the RC equipment to fit....

Front fuselage part plug.. making :


Hardwood blanks with a fuselage template.


Cutting on the bandsaw.


Smoothing out on the bandsander.


Bandsawing the sides of the plug.


Sanded on all four surfaces.


Rounded edges, and sanded.

The canopy cover and side fuselage shells will be vacuum baged, but as I have not yet made wacbag box, I decided to test my plug using well prooven plastic bottlemethod for making test parts.

First I made a blue canopy:


Test canopy made.

Then I made a piece of side shell. It came out shorter, as the bottle was not large enough. But for the test of plug and test fit of the shell to the basic fuselage structure, it was enough.


Fuselage shell. Fits well.


Showing off....


Well, so much for my first post in this new story.

See ya!

Mitja
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Last edited by ultralajt; Mar 06, 2010 at 03:36 PM.
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Old Mar 06, 2010, 02:05 PM
Impatience is a virtue
MCH27t's Avatar
Denver, Colorado
Joined Nov 2008
682 Posts
Cool! I like it. Great work
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Old Mar 06, 2010, 02:30 PM
SlingWinger
San Bernardino, California, United States
Joined Oct 2004
1,668 Posts
Keep up the good work!
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Old Mar 06, 2010, 06:42 PM
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yellowblue's Avatar
west yorks. UK..Home of the Hudds mafia
Joined Apr 2006
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Grear stuff I'm watching with interest....I like small toys
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Old Mar 06, 2010, 08:32 PM
Just Toss It !!!
MATIN's Avatar
United States, CA, San Diego
Joined May 2004
6,063 Posts
Looks like something from a bygone era........long long ago when people actually LIKED building planes!

Matin
still likes building...
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Old Mar 07, 2010, 02:13 AM
The original Flying Pigs Sqd.
Up&Away's Avatar
Netanya, Israel
Joined Aug 2002
10,066 Posts
Getting interested...
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Old Mar 07, 2010, 02:34 AM
MINE!
Mick Molloy's Avatar
Australia, VIC, Point Cook
Joined Jul 2003
3,202 Posts
Nice..... what program did you draw it up in??
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Old Mar 07, 2010, 04:33 AM
Torn 'twixt buildin' and flyin
TheNightowl's Avatar
United States, TX, Austin
Joined Oct 2007
7,220 Posts
Subbed up!
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Old Mar 07, 2010, 06:22 AM
Registered User
The Far East
Joined Jan 2006
853 Posts
Will this be offered as a kit? Looks very very interesitng AND! promising as a fun sloper.
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Old Mar 07, 2010, 08:41 AM
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ultralajt's Avatar
Ljubljana Brnik, Slovenia
Joined Sep 2004
1,246 Posts
Quote:
Originally Posted by Mick Molloy View Post
Nice..... what program did you draw it up in??
Just rendering... http://www.rhino3d.com/
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Old Mar 07, 2010, 08:46 AM
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ultralajt's Avatar
Ljubljana Brnik, Slovenia
Joined Sep 2004
1,246 Posts
Quote:
Originally Posted by suirendoujin View Post
Will this be offered as a kit? Looks very very interesitng AND! promising as a fun sloper.
If model will fly as I expected, I am thinking of a smal test batch of ARC model KIT, for local guys here.

The problem is, that model is designed in such way, that needs some unique DIY tools and accessories to build, that`s why it is a little unsuitable for the pure scratchbuilders. So, no use of offering plans.
This way of design allow me to build fast and acurate (hopefuly ) using adapted tools, jigs and so on...

Today I recieved 3 heaters (300W each) from my friend, so I can start thinking of a vacuum baging machine.
I am also starting wit assembly of the firm bench for a router tool for carving the leading edge of the wing.
Tomorrow I will probably purchase some plastic sheet to have something to play with..

Mitja
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Old Mar 07, 2010, 10:50 AM
Fly fast, Dont crash.
Thepasty's Avatar
Cornwall, UK
Joined Sep 2006
2,459 Posts
Thats going to be a nice little plane Mitja.

I'm interested in how you're making the fuz, you've made a plug and you mention vac bagging, are you planning on making two halves and then joining?

Steve
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Old Mar 07, 2010, 02:07 PM
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ultralajt's Avatar
Ljubljana Brnik, Slovenia
Joined Sep 2004
1,246 Posts
Quote:
Originally Posted by Thepasty View Post
Thats going to be a nice little plane Mitja.

I'm interested in how you're making the fuz, you've made a plug and you mention vac bagging, are you planning on making two halves and then joining?

Steve
Yes, left and right half. And canopy as separate transparent part.
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Last edited by ultralajt; Mar 07, 2010 at 03:53 PM.
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Old Mar 07, 2010, 03:30 PM
Gravity sucks
SrWade's Avatar
United States, WA, Richland
Joined Mar 2006
2,501 Posts
Should be a fun plane. I built an original version of the motor glider Guppy and enjoyed flying it until a radio glitch took it into the Pacific. Amazing how fast a LiPo get hot in salt water!

Mike
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Old Mar 07, 2010, 06:38 PM
If it ain't broke...break it!
Hangtight's Avatar
South Coast, UK
Joined Jun 2006
912 Posts
Looking at the fuse structure and the mention of heaters, is the fuse going to be vac bagged or vacuum formed from plastic?
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