GliderIreland - Ireland RC Forum - Flying Model forum in Ireland

Gliders => Scale => Topic started by: Fred on June 06, 2007, 08:49:38 AM

Title: 1/13 scale Grunau Baby IIb
Post by: Fred on June 06, 2007, 08:49:38 AM

Hello there,

Here is my new challenge.. Yep, sometimes, on the Retroplane Forum, well, I must shut up and don't take challenges !!  :D
Vincent had a simple idea... Why not make mini / micro scale models, but the same way as the bigger one ? Let's say, a maximum scale of 1/10 ? Who want to try ?
And that's enough for me to build another glider !  :wink:
Vincent, at the same time, is building a wonderfull Cimbora ! ( http://www.retroplane.net/cimbora/page1.htm )

So, here we go !

First, the scale has been choosen, because of my smallest battery pack... The pack must fit into the second former.. That gave me the scale ! 1/13, that's around 1.20 mtrs wing span...

All the formers :

(http://www.retroplane.net/forum/images/uploads/loopingfred/minigrunau3_529.jpg)

The pen give the size...

The smallest one :
(http://www.retroplane.net/forum/images/uploads/loopingfred/minigrunau4_453.jpg)

All the front formers are made with 3mm plywood... Rear ones, are in 2mm balsa.

(http://www.retroplane.net/forum/images/uploads/loopingfred/minigrunau1_288.jpg)
Taking shape...  :D

(http://www.retroplane.net/forum/images/uploads/loopingfred/vueempennages_190.jpg)

The entire glider is sheeted with 0.4mm plywood, then a coloured varnish is applied (teak).
All surfaces are scale ! The covering is made with Japan Paper and a mix of water and white glue (around 50/50)

Only 2 servos (9grs) as the glider only have rudder / elevator functions.. We will see later... And it's not a big job to make a wing with ailerons...

(http://www.retroplane.net/forum/images/uploads/loopingfred/cockpit2_186.jpg)

Nice eh ?!  :wink:  :D

More to come !!

And a bit more pictures here :
http://www.gliderireland.net/minigrunau.htm

Title: 1/13 scale Grunau Baby IIb
Post by: Alan_Perse on June 06, 2007, 13:13:16 PM

Man, that went together quick. Cool  :D  :D  :D .

Title: 1/13 scale Grunau Baby IIb
Post by: Fred on June 11, 2007, 08:05:25 AM

Well... that's a month after I start !  :wink:

But roughly, there is 5 evenings worth of work.

And here is a picture of the beast yesterday (the glider, not me  :lol: ) :

(http://www.gliderireland.net/forum/images/uploads/Fred/grunaupente1.jpg)

Video as soon as I find my dv cable !  :!:

Title: 1/13 scale Grunau Baby IIb
Post by: Alan_Perse on June 11, 2007, 20:13:37 PM

Looks great Fred.

Title: 1/13 scale Grunau Baby IIb
Post by: Fred on June 12, 2007, 08:51:23 AM

Thanks Alan !  :D

And looks even better in the air ! :

http://www.gliderireland.net/images/videos/minigrunau.wmv  ( 4.9Mo)

Title: 1/13 scale Grunau Baby IIb
Post by: Fred on July 25, 2007, 08:28:57 AM

Some pictures of the mini Grunau, in flight during Retroplane 2007 (you can have the full album and higher resolution photos here : http://www.retroplane.net/album/index.php?cat=11

Well, You need at least 2 launchers ! And not the smallest ones !  :lol:  :lol:

(http://www.gliderireland.net/forum/images/uploads/Fred/normal_Grunau-mini_Fred1.jpg)

And in flight :

(http://www.gliderireland.net/forum/images/uploads/Fred/normal_Grunau-mini_Fred3.jpg)

Fly like a dream !
Really easy to fly, and even only with Rudder / elevator, she's really responsive. We tried the roll (well, you need altitude !  :wink: ) and the loop.. And that's pretty much it !
After that, slow low passes to admire the line of the machine.
Thanks to Anthony for the decals (available here : http://www.rubberprintdesign.com)
Plan in a magazine sometimes next year, with Vincent's mignificent Cimbora  =P~

Title: Re: 1/13 scale Grunau Baby IIb
Post by: drover on March 18, 2022, 09:51:38 AM

Congrats for your magnificient  glider.
Can someone tell me were can fint the plans for the 1/13 scale Grunau Baby IIb ?
Please i want to build one like this.
Best Regards
George