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Nov 02, 2007, 03:47 AM
Vini, Vidi, Scalies
LoopingFred's Avatar
Thread OP
Build Log

1/3 Scale Ka3


Hi there,

So, here is my new project for the beginning of the winter !
During Retroplane, we were talking and showing the 1/4 scale Ka3, and between 2 glasses of schnaps some of the German guys suggested that the Ka3 is fine, but bigger, that will be better !

Ah well, sometimes, it's hard to say no to things like that !

So, I have redraw the smaller Ka3, change a few bits and pieces, and here we go !
Slow start, let's say a warm up, with the tail mounting pieces.

The parts :


And 10 minutes later :



And that's it for today ! Next on that piece is to glue the carbone tubes for the V tail.

Next... Well, I have to make space in the garage now, and I'll certainly start the fuselage.

Fred
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Nov 05, 2007, 06:23 PM
Registered User
solitairyman's Avatar
Hi Fred,
Why not copy the Cliff Charleswoth plan to 1/3 scale.
His designs are fantastic, and so the K3. I have flown one of his designs in 1/3.5 scale for 6 years with great succes. Now it's sold to Germany for it's second life. See for info on UK site of the scale soaring group:
www.scalesoaring.co.uk

Solitairyman
Nov 05, 2007, 08:23 PM
TEAM GORGEOUS
SZD16's Avatar
Quote:
Originally Posted by solitairyman
Hi Fred,
Why not copy the Cliff Charleswoth plan to 1/3 scale.
His designs are fantastic, and so the K3. I have flown one of his designs in 1/3.5 scale for 6 years with great succes. Now it's sold to Germany for it's second life. See for info on UK site of the scale soaring group:
www.scalesoaring.co.uk

Solitairyman

I would say because Fred plans to kit and sell this design when he is done with it and that's not a real good idea if you don't use your own design!
Nov 06, 2007, 05:12 AM
Vini, Vidi, Scalies
LoopingFred's Avatar
Thread OP
Well, I think SDZ have a point here !
And even if I was not going to sell short kit, I design all my gliders, that's a big part of the fun !
So, here is the progress on the machine so far...

Sunday, busy day in the workshop, with the building of the fuselage.

A looooong 5x5 hardwood strip is placed on the plan. Everything is aligned with a laser and fixed to the workbench.
Then, all the formers are glued to the wood, checking at each time the alignment :



Of course, you also need to check that evrything is square !




And we glue everything slowly, making sure everything is straight



Then, we can glue the wing support on the fuselage

Nov 06, 2007, 05:13 AM
Vini, Vidi, Scalies
LoopingFred's Avatar
Thread OP
Then, the next job is to glue all the 5x5 hardwood strips to the fuselage...Twice ! because I glue a first 5x5 strip, then, once dried, I glue a second one on top. Easier to bend, and once the second one is glued and dry, this is, well, I think, much stronger than a single 5x10 strip.
Of course, you glue each strips doing each side at the time (symetric and avoid the fuselage to go banana !
And you can check that everything is square using the laser




Once dry, you can move the fuselage to have a first overall look at the beast !



So, next, finishing of the fuselage webing, and another few bits and pieces and we can start to have a look at the wings !
Nov 06, 2007, 09:29 AM
Burning & Turning
justy g's Avatar
Fred

I am watching with interest the joys of laser cutting just locks together ... i know it's 1/3 scale so what's the wingspan.

Also do you have a time span for production once the prototype is built?

Justin
Nov 06, 2007, 09:56 AM
Vini, Vidi, Scalies
LoopingFred's Avatar
Thread OP
Hi Justin,

Sorry, I've put the specs on the Scale Soaring UK forum, but not here...
So, here we go :

Wing Span : 3.33 mtrs
Fuselage lenght : 1.87 mtrs
Wing chord : 35 cm
Single stabilisator span : 42 cm

Weight : I think that's going to be around 6 kilos, we'll see !

Well, for the production.. that will be once the prototype is built (should not take long ) and test flown several times.. Once happy, we go production.
I can't really give a time span, but that should be relatively quick as it is relatively easy to build (yep, everything is relative.. ), and so far all is OK (ok ok, I found 1 or 2 glitches, and the files are updated for the cutter each time, almost live).
But I'll keep you posted !
Nov 06, 2007, 10:11 AM
Burning & Turning
justy g's Avatar
Cheers Fred

This looks like it could be my project for next year... lets hope you can mail a kit to Macau

Justin
Nov 08, 2007, 03:15 AM
Vini, Vidi, Scalies
LoopingFred's Avatar
Thread OP
Hi Justin,
No problem, can mail pretty much anything to anywhere !

Here is the progress on the fuselage :





The "webing" is finished ! The fuselage is now really strong and light.
Next, I think I'm going to shape the nose and work on the Vtail
Nov 11, 2007, 06:28 PM
Registered User
solitairyman's Avatar
Hi Fred,
Got the measage
But all looks great anyway. Looking forward to the rest of the plane.
keep us posted.
Solitaryman
Nov 12, 2007, 11:32 AM
Vini, Vidi, Scalies
LoopingFred's Avatar
Thread OP
Thanks Solitaryman
Back to the Ka3 now, with a bit of work on the huge V-Tail over the week end !

All the pieces



And here we go ! The V-Tail assembly is a non event.. no difficulties at all here...





Ok, you can see the burn here... I think the cnc laser machine did a break here :lol:





And the result to motivate me !
Nov 12, 2007, 11:33 AM
Vini, Vidi, Scalies
LoopingFred's Avatar
Thread OP
Next are the LE, sheeting (with 2mm balsa) and the tail joiner made of carbone tubes (7mm ext. and 5 mm int.) and glued with epoxy


Same here, a non event...






Et voila ! the hinges are Robart type. the moving tail LE is sanded in 1/2 circle.



Next ?... back to the fuselage, with the nose cone, and i'll start to have a look at the cockpit interior...
Nov 19, 2007, 03:21 AM
Vini, Vidi, Scalies
LoopingFred's Avatar
Thread OP
Not a lot done over the week end...
But a bit of work on the wings.
So, 1/2 wing is almost completed, just the sheeting need to be done.
Photos of the early stages :



The spar is made of Pine wood...



And then, the top spar :



For the ailerons, a balsa pieces is interlocking with the ribs.



Easy !
Well, I'll take more photos tonight, but the wing tip is done, so as the Leading edge (balsa 10mm + 5mm) and waiting for the wing joiner to come in to complete the sheeting.
I'll start the second 1/2 wing tonight !
Nov 19, 2007, 03:51 AM
Burning & Turning
justy g's Avatar
Fred

You are certainly not wasting any time with your build...great work so far
Nov 19, 2007, 04:37 PM
aka Schleppmeister
Quote:
Originally Posted by LoopingFred
Hi Justin,

Sorry, I've put the specs on the Scale Soaring UK forum, but not here...
So, here we go :

Wing Span : 3.33 mtrs
Fuselage lenght : 1.87 mtrs
Since you are building a 1/3 scale - the full scale just had a WS of 10m???


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