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Old Dec 25, 2006, 09:00 AM
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ViktorF's Avatar
Krasnodar, RUSSIA
Joined Nov 2004
1,027 Posts
Quote:
Originally Posted by mascot
Viktor, did you use some kind of mold when you laminated those carbon rowings to spars and other pieces? I'm going tomake this bird for slopeflying and it should be as stiff as possible.
Nope, no molds. I own some carbon/fiberglass ply and strip it.

You can take carbon rowing or fiber and epoxy it to your longerons material between glasses.
Then cut it lengthways for your longerons sizes.
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Old Dec 25, 2006, 09:11 PM
No drugs to fly high
oracle_9's Avatar
Toronto, Canada
Joined Jan 2004
764 Posts
Well, I got all 4 wing panel sections done and sanded. All thats needs is to glue together and cover.

Here are some weight measurements I made:

ribs = 8g
spruce spars = 19g
TE = 7g
LE sq. = 5g
LE top/bottom sheetings (inner/outer panels) = 25g
center panel top/bottom sheetings (between LE and TE) = 5g
shear webs = 1g
Wing tips = ?
----------------------------
Total = 70g

After gluing and sanding:
inner left panel = 26g
inner right panel = 26g
outer left panel = 12.5g
outer right panel = 12.5g
----------------------------
Total = 77g

I am aiming towards using Ultracote lite transparent color.
Tomorrow I will get started on the fuselage.
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Old Dec 25, 2006, 11:16 PM
My Hangar is full
No Step's Avatar
Everett, Washington
Joined May 2003
3,913 Posts
This design has attracted modelers from many places,...
Russia, Canada, Slovenia, Turkey, Finland, United States, Australia, Italy, United Kingdom, Spain, Sweden, South Africa,....and more. I'm sure I missed one or two

It's beauty definately attracts lots of attention. Nice one Mitja. It's on my build list.
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Old Dec 26, 2006, 01:49 AM
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ViktorF's Avatar
Krasnodar, RUSSIA
Joined Nov 2004
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Not many talented modelers do them designs absolutely free.
Thanks mans as Mitja, they enable us to take pleasure from build a good models.
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Old Dec 26, 2006, 04:58 AM
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ultralajt's Avatar
Ljubljana Brnik, Slovenia
Joined Sep 2004
1,233 Posts
Thanks for nice words!
They give me great momentum to carry on with my designs!

Mitja
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Old Dec 26, 2006, 09:22 PM
Polish Pilot ;)
PatrykU's Avatar
Adelaide, Australia
Joined May 2006
237 Posts
Hi Mitja !
I ve got a question about the wings. I'd like to have some ailerons, but I want to teach someone how to fly on that glider, so Can i do hotliner version with the flat bottomed profile ? Will it fly ok ? I have the ribs cut out so I dont want to waste any balsa. I'll have a look at the hotliner wing plan and I might do that. I'd like to hear a reply from you

I've got the fuse nearly finished
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Old Dec 27, 2006, 12:57 AM
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Ljubljana Brnik, Slovenia
Joined Sep 2004
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You can build Hotliner wings and use "flat bottomed" airfoil (Aquilla) instead original RG.
But remember, that you should draw your ribs by yourself, because the outer wing panel is not similar to original plydihedral wing. It has more ribs and they are placed at different locations.
I suggest you also, that you make dihedral enough large, so when flying only with ruder and elevator, the Guppy will follow the rudder inputs.

But remember, that polydihedral will have kind of "breaking" effect for the ailerons, so rolls will not be so snappy as at original hotliner wings. My friend Rupert build original wings (poly wings), remove dihedrall and install ailerons, but he complain about slow roll rate when doing aerobatics, and also a lack of penetration (Aquilla airfoil)

Remember, that Aquilla airfoil is not so penetrateable as RG.

If I was you, I will build two wings for Guppy. The first one would be original poly wing, and another the Horliner wing.

First flights will be done with slow and stable poly wing, and they will serve also for teaching someone to fly, but hotliner wings will be used wgen weather conditions will be great for some fun or aerobatic flying.

Both wings are great for its own purpose and I think that mix of them will produce an "average" result, not the best for slow, neather for fast flying.

But I might be wrong, so it is up to your decision now.
In any case, I would like to hear your news about your decision and of course, the flight report in order that I can find out if my statements are right or wrong, based on your experiment.

With best regards,

Mitja
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Old Dec 27, 2006, 01:25 AM
Polish Pilot ;)
PatrykU's Avatar
Adelaide, Australia
Joined May 2006
237 Posts
Thanks for the reply. If you say so I will build two wings like I planed before. If I had the expirience of building from balsa than I would have gone straight to tha hotliner. I just don't want to stuff up anything with the RG profile. It looks a lot harder and pretty ticky to build. If I didn't care about the weight than I would have cut out the wings out of polysterene covered with balsa because that would be easier. I might do that for an experinment in future. It's my first glider aswell after few foamies.
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Old Dec 27, 2006, 02:24 AM
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Ljubljana Brnik, Slovenia
Joined Sep 2004
1,233 Posts
It is not bad idea to cut foam core and cover it with balsa.
The very first prototype of Guppy had foam/balsa sandwich wing.

So, if one had previous experience with foam core balsa wings, could make such wings.
I believe that light white styrofoam and 1mm balsa skin would be suficient.
Also, the weight penality, if one select very light balsa skin, should be in reasonable margins.

This white prototype of Guppy has styrofoam/balsa wing.


Mitja
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Old Dec 27, 2006, 02:52 AM
Polish Pilot ;)
PatrykU's Avatar
Adelaide, Australia
Joined May 2006
237 Posts
That's great! That will make the life easier for me I have the materials to build the Aquilla profile wing so I will make it anyway. I'm probably going to get the order from my foam suplier this week so I might build the hotliner wing next week. Thanks for help Mitja !
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Old Dec 27, 2006, 03:05 PM
kll
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kll's Avatar
Ankara,Turkey
Joined Oct 2006
94 Posts
Quote:
Originally Posted by ultralajt
Merry Christmass
Joyeux Nol
Wesołych Świąt!
vesel Vianoce
Feliz Navidad
God Jul
sheng tan k'uai le
buon natale
С Пождеством! (s'pajdestvom)
Hyv joulua!
Selamat Hari Natal
Crciun Fericit!
Καλά Χριστούγεννα!
mutlu noeller
vrolijk Kerstmis
mubark hoon
Maa-yong Paskwa
Srećan Boić
Vesel boič

and many many happy flights in New Year 2007 !

Mitja
"mutlu yillar" , friends.

i think i will build another guppy with power pod on its wing in 2007.
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Old Dec 27, 2006, 03:14 PM
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Kalim3ro's Avatar
Israel
Joined Jul 2004
156 Posts
CAD file problem

I've downloaded a plan from the profili2 website to work with the Isiplot software, but I want to laser cut the parts, but the laser cutter works with AutpCAD, and I can't open the file with AutoCAD. I'm trying to convert the guppy file.

Hadar
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Old Dec 27, 2006, 03:18 PM
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ultralajt's Avatar
Ljubljana Brnik, Slovenia
Joined Sep 2004
1,233 Posts
Hadar, try to download Guppy parts templates (somwhere on previous pages in this thread is a link).
It is as PDF file, so you can use some of the free PDF to DXF software in order to convert the file.
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Old Dec 27, 2006, 03:43 PM
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Israel
Joined Jul 2004
156 Posts
I tried it, and it doesn't come out right. the dimensions are different.
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Old Dec 27, 2006, 04:49 PM
Polish Pilot ;)
PatrykU's Avatar
Adelaide, Australia
Joined May 2006
237 Posts
Quote:
Originally Posted by No Step
This design has attracted modelers from many places,...
Russia, Canada, Slovenia, Turkey, Finland, United States, Australia, Italy, United Kingdom, Spain, Sweden, South Africa,....and more. I'm sure I missed one or two

It's beauty definately attracts lots of attention. Nice one Mitja. It's on my build list.
I just remembered about your post. Yes you're right. You missed Poland
I come from Poland I just live in Australia. I post on Polish forums aswell. I got two people to make a guppy now ! In one week
Its worth it. Everyone says its beautyful.

Well done again Mitja !
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Last edited by PatrykU; Dec 27, 2006 at 05:04 PM.
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