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Old Mar 02, 2009, 06:42 PM
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Australia, VIC, Delacombe
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Thanks Mitja,I plan on going to Hobby city,that this will be a great help.

3810
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Old Mar 05, 2009, 01:40 AM
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Ljubljana Brnik, Slovenia
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Hi!

Recently, I didnt publish here reports from build.
I hope will have more time over this weekend to do that, so here, just a brief report on the progress:

Model is 80% finished.

Mitja
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Old Mar 05, 2009, 04:05 AM
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Mitja,as Hobby city dont sell the Welgard brand of motors could you recomend a motor they sell.That all look and sound the same to me.

Paul
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Old Mar 05, 2009, 06:13 AM
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Quote:
Originally Posted by 3810
Mitja,as Hobby city dont sell the Welgard brand of motors could you recomend a motor they sell.That all look and sound the same to me.

Paul
This one will fit I suppose:
http://www.hobbycity.com/hobbycity/s...idProduct=8495
and that one allso:
http://www.hobbycity.com/hobbycity/s...idProduct=8502
and this one:
http://www.hobbycity.com/hobbycity/s...utrunner_920kv
and :
http://www.hobbycity.com/hobbycity/s...idProduct=2106


But I dont know what climbing performance you like, so it is up to you.

Of course, you must choose a right prop, ESC and battery combination in order not to overload the system. read suggestions for a prop at each mototr, and max amps, so you can choose ESC accordingly. Take in concern allso the thrust produced if shon beside motor data at different prop and battery combinations.

This pdf file shows recomendations for the propellers:
http://www.hobbycity.com/hobbycity/s..._BR_Series.zip
so it Can help you choosing proper combination.

But remember, Guppy has only 28mm diameter of the space in the nose, so this is the upper limit for the motor diameter.

Mitja
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Old Mar 06, 2009, 03:17 PM
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Another brief report on the prototype build.

Today I finished the fuselage and install the motor in the nose.



Tomorrow I must install all four servos and make pushrods&controll horns, cover the model with Oracover heat shrink foil, and make canopy.

Hopefully on the Sunday, the maiden flight will be done.

Mitja
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Old Mar 06, 2009, 05:21 PM
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That is a very nice glider Mitja.
Trent
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Old Mar 07, 2009, 01:57 AM
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Thanks Trent!

Yes, I allso believe it is a nicely shaped glider.
Thats why over a 500 Guppies fly all around the world (according to many Guppy building threads in different forums, and e-mails I recieved from happy builders)
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Old Mar 07, 2009, 02:21 AM
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Two tipps for the builders:

Making a canopy

Today I make a canopy for the new Guppy. I simply use old canopy plug and insert it in a Cola bottle. Off course I cut away the neck and bottom of the bottle with csissors.

I push plug into a bottle and use a wooden plank to tighten plug inside the bottle.

Now I just fire up the kitchen gas burner and fast rortate the bottle over the heat of the flame. I was doing swiftly and observe how the bottle shring around the plug.

This hint is usefull for those who dont poses hot air gun, or dont wont to mess with pot of boiling water.


Cutting the round hole into the gliders nose:

My Guppy accept a 27,5 mm diameter motor in the nose.
Therefore a large hole must be somehow drilled trough a nose section of the fuselage. As I dont poses adequate drill, I simply use an empty can of broken SPEED 400 motor. I make its edge serated with a file.

Now I just hold this motor can in hands and slowly turn it and it cut a hole trough a balsa wood.

It is amazingly simple. But it is essential to start cutting at proper angle, as later you cant correct what you have started.

After a hole was "drilled", I sand inside to slightly enlarged the hole and make it smooth.

I allso spray inside of the hole with a dope, to harden the surface.
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Old Mar 07, 2009, 03:46 PM
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Artf

Tomorrow to connect servos with control surface horns, and make controll surfaces hinges..... and if weather permitt, a first flight will happen.

RTF mass is 550g (19,4 oz)...not much for a 1,7m span electric glider.






Mitja
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Old Mar 07, 2009, 04:22 PM
Circa:1946
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Joined Jun 2008
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Guppy MK ll

Looks Great Mija!!!

I think it would be very hard to duplicate your results using Metric plans & using U.S. Standard size balsa!! And not having the CNC parts would be very time consuming to get perfect!!!

Maybe someone here in the US that can supply a CNC kit on time, will make you a good deal??

The Riverrat
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Old Mar 08, 2009, 01:08 PM
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Maiden succsessful !

Today the new Guppy 2 taste the air!

I am very satisfied with handling and performance.

It had no bad habbits and there is no fear for sudden wing tip drop or nasty stall behaviour. Really joy to fly!

The installed powerplant gives acceptable climbing ability, so no need foe more power. I will upload a movie later, where it will be all visible, but in meanwhile, some photos of todajs flying.



























Regards!

Mitja
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Old Mar 08, 2009, 01:25 PM
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Guppy MK ll

WoW!!!
Mitja!!!

Beautiful!!!!!!
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Old Mar 08, 2009, 02:23 PM
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And a video clip from today:

Guppy 2 first flights (10 min 0 sec)
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Old Mar 08, 2009, 02:57 PM
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United Kingdom, England, Stratford-upon-Avon
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Well done! Beautiful design, great build info, and lovely photos and video.

Neil.
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Old Mar 08, 2009, 04:47 PM
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Hi mitja
I and a friend of mine are going to build your Guppy MK2 XS. We have access to a cnc cutter in school! When can you release the cnc plans?
This would be our first wooden rc plane...
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