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Old Dec 07, 2012, 08:08 AM
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juanjulian's Avatar
Guatemala, Guate
Joined Jul 2007
290 Posts
Build Log
K&A l39 build

Probable a few years late since the boom of this plane, but it is my time to build one.

Aquired this plane here on rcgroups and is the balsa sheteted foam wings scale version. Not so sure but asume since wings measure 36 inches.

Equipment
Fan: change sun 10 blade
Motor: pending will like a het 2 w25
Tried this fan and a kontronic 48o-36 and the motor was loading to 90 amps in 4s.

Servos: pending Ken seems to use hs 55, ┐will this be good? They have a nice price. I used some micromdigital metal gear futaba servos in my rbc ta 183 and think they were a overkill.

Retracts: thinking of getting the micro pneumatic landing gear from hobbynking. Won't like to spend big dollars on Map retracts.

Rx: hitec minima or optima 7

Build has started
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Old Dec 07, 2012, 08:16 AM
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Guatemala, Guate
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More fotos learning how to upload from ipad






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Old Dec 07, 2012, 01:15 PM
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turbonut's Avatar
upland CA
Joined Dec 2004
7,496 Posts
Cool! dotn see a lot of K&A kits built latley..that is the slope wing version. I would set it up with a full flying stab its easy and works great. the stab angle is not good for modern power levels. other than that its a real pussy cat to fly..I like the hs 65mg servos ..
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Old Dec 07, 2012, 05:44 PM
Spaceplanes...
Damage's Avatar
Nr Glastonbury, Somerset, UK
Joined Oct 2006
316 Posts
Maybe this will give me the impetus to finish mine. It's sitting there in the pre-paint stage, about 95% done.

I have air retracts in mine but would have preferred to use servos as on all my other planes. Also fitted flaps per an earlier thread and put landing lights in the tip tanks.

Watching with interest...
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Old Dec 07, 2012, 05:55 PM
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juanjulian's Avatar
Guatemala, Guate
Joined Jul 2007
290 Posts
Turbo nut

Will apreciate more info the flying stab specially position of torque rod.

Damge
I'm a slow builder so be patient. Have other projects going along.

Cheers all

Juan
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Old Dec 07, 2012, 10:48 PM
Just having fun before I die!
BadLemon's Avatar
DeKalb,IL
Joined Dec 2008
935 Posts
Hi Juan
You got another nice build going will watch with interest, good luck on the build!

Doug
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Old Dec 08, 2012, 08:52 AM
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Larry Dudeck's Avatar
Williamsville, NY, USA
Joined Sep 2000
4,498 Posts
I flew mine (ca 2008) with an old Kyosho 75 mm fan, an HET2W on 3S. Perhaps mine was an early version but the ducting fit the Ky fan perfectly. Needed a bungee to launch, but was a decent flyer. After an "off field" landing that damaged the wing, I made a larger wing that increased the area by 12% and reduced the weight. This change was enough so I could then hand launch the L39.

I'm not sure what ended her flying career but just recently I was cleaning out the work shop and came across the FG ducting and the balsa wing. Tossed them.
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Old Dec 10, 2012, 04:20 PM
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juanjulian's Avatar
Guatemala, Guate
Joined Jul 2007
290 Posts
Working a litle each day. A lot of reunions this time of year.

Glued the plastic intakes to the fuselage with, Goop. Very happy wiht this glue each time I find more uses. The fan duct was also glued with this.

Finished cutting the ailerons of both wings, and sanded the leading edge. Masking tape is my friend when sanding.

Will glue both wing and stop until have the retracts to continue.

Not sure if doing flying stab or the normal elevator.

Cheers
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Old Dec 11, 2012, 09:57 AM
Just having fun before I die!
BadLemon's Avatar
DeKalb,IL
Joined Dec 2008
935 Posts
Juan

Never seen plumbing glue like that before is it use to glue PVC pipe together? Nice work on the L-39 I have a V-1 Buzz Bomb kit from K&A I want to build this winter. K&A makes a nice kit for sure.

Doug
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Old Dec 11, 2012, 11:52 AM
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juanjulian's Avatar
Guatemala, Guate
Joined Jul 2007
290 Posts
Hi Doug:

This glue is like contact cement but on steroids. The same stuff comes in diferent names: MARINE, PLUMBING, AND GOOP.

It is fuel proof, water proof, and bonds different materials.

Give it a try, awesome glue.

Uses I have found:

Fixing kids shoes, and worn soles.
.
Rc cars entusiast use them on the wheels

Sealing a fuel tank

Gluing velcro to battery packs

Gluing fiber ducts(it glues to a solid rigid but flexible bond)

Considering using this glue instead of hysol for gluing formers inside composite fuselages(flexible and strong bond). It is a lot cheaper.

Cheers

Juan
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Old Dec 11, 2012, 02:05 PM
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upland CA
Joined Dec 2004
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Hi Juan, Sorry no pics yet for the stab mod..I have been a bit busy..last week 40 hours at work then 35 hours on the week end with my side work..and still not finnished..With the built up tail it is a bit more work to do the flying stab mod. if you dont you may want to give the stab a deg of positive..
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Old Dec 17, 2012, 05:40 PM
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juanjulian's Avatar
Guatemala, Guate
Joined Jul 2007
290 Posts
Hard to make time to get some work done this time of year.

Will have a rudder ans servo glued to the inside with a opening to one side for control.

Thinking about elevators .......
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Old Dec 20, 2012, 03:47 PM
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juanjulian's Avatar
Guatemala, Guate
Joined Jul 2007
290 Posts
Started measuring for the elevator build and found some problems.

MY RUDDER FIN IS NOT CENTERED

You can notice in the picture above.
Any sugestion for fixing it?

I was thinking in using the heat gun and heating the fiber fuselage to fix the problem. Worried of doing more damage than fixing the problem.

Cheers
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Old Dec 20, 2012, 04:57 PM
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upland CA
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Tilted to one side?? you can apply heat or just glue a stiffner inside the fuse and hold it straight
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Old Dec 23, 2012, 09:43 AM
Just having fun before I die!
BadLemon's Avatar
DeKalb,IL
Joined Dec 2008
935 Posts
Hi Juan

Looking at the picture it looks like the right side of the fuse is higher then the left side. Now this could be just an optical illusion but that is the way it looks to me. If so may be able to fix the vertical fin if yo pull down and align the fuse. But if not I have the same problem with an airworld Me-262 and did what Turbonut suggested and it fixed the problem. I made a jig out of foam to set the fuse in and strap it down. Then I heated both sides of the vertical stab and braced it and let the fiberglass cool. Note this worked for me but I was warned not to get the fiberglass to hot or it will buckle.Then I made a support brace for the v-stab and glued it in and had a cross section support that glued to the fuse.
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