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Jay Burkart's blog
Archive for December, 2010
Posted by Jay Burkart | Dec 29, 2010 @ 12:31 AM | 4,999 Views
This is the framing of the midsection of the Airborn 1600 Wing.
This has the wing joining system and alignment pin.
The framing has a kerf spacer right in the middle to allow for the width of the
blade when I cut the wing in two with a radial arm saw.
Note the end plugs installed on the joiner tube in one step so that the joiner
Carbon fiber rod does not just push all the way through the joiner tube.
The tube is installed at this time without the Carbon Fiber rod so as not
to cut it in two when cutting the wing section.
Posted by Jay Burkart | Dec 27, 2010 @ 06:28 PM | 3,883 Views
Made a little more progress on the Airborn 1600's.
I made the fastening system between the Horizontal stab and the Vertical stab.
I have done this fastening system for quite a few years now and have not had any problems.
Used a 1/8" carbon pins in the front bottom corner of the Vertical Stab where it goes into
a socket at the middle of the Horizontal stab. The Horizontal stab on this model has a 1/16 plywood
bottom at the bottomed of the slot to give it some extra strength and a seat to where the
rear 8-32 nylon screw pull the rear of the Vertical stab down and in.
The carbon fiber pin goes through a piece of hard balsa and the H. stab leading edge which
are also hardened with thin CA. The CF pin goes about 1" up and into the V. stab and is held
in with thin CA also. The thin CA will wick up and around the pin all the way and really holds
very tight, better than an epoxy joint.
Posted by Jay Burkart | Dec 22, 2010 @ 10:08 PM | 3,692 Views
This is still prep work for building the wings.
Two of the center section ribs, one on either side of the CL are doubled with 1/8 aircraft plywood
to reinforce them for the wing mounting pins of 3/16 carbon fiber that will stick out the leading
edges into a bulkhead on the fuselage.
So you see the 1/8 ply sub ribs. Also the spars are doubled at the center section
to make the wide enough to support the 3/8 OD brass tube that is the socket for the
Carbon Fiber joiner tube. The spars will support Plywood shear webbing in support on
either side of the brass tubes as the joiner tube "box".
Also the joiner brass tube is shown how it is roughed up for very good adherence to
the epoxy that will be used to join the box sides together.
Also you see the joiner tube with the holes drilled for it through the center
section ribs giving it's location between the main spars. This is just given
as an idea of how it will go into the ribs.
Posted by Jay Burkart | Dec 16, 2010 @ 09:36 PM | 3,954 Views
Attached is some progress from the last couple of days.
Started the wings,
Cut all the 1/4" sq Spruce spars and started bonding the .014 Carbon fiber onto one side.
Trimmed, sanded and adjusted all 126 ribs to fit the new deeper spar because of the Carbon fiber.
Glued up the wing tips.
Will be bonding Carbon fiber to all the spars for quite a few days.
There are over 24 spars.
I sand all the pieces before I glue them into the wings. Makes final sanding of the wing
so much easier and the fit is better.
Also gets rid of the burn marks on the edge of all the Laser cut balsa.
Still need to get 8 more pieces of Spruce in for the spars.
Need to cut and notch all the Trailing edge and cut the LE pieces.
The wings on these Airborn 1600's will join in the center with a carbon fiber rod
very similar to how the wings join on the large winch launch sailplanes.
Posted by Jay Burkart | Dec 14, 2010 @ 12:04 PM | 3,592 Views
Decided to make some more Airborns for SAM Electric and Texaco events.
Three of this size Airborns this time.
I have built 28 Lanzo Airborns so far. Lets say I can't get too much of a good thing. From 1/2A 280 sqin, now up at 1600 sqin.
Jack Hiner had Jim O'Reilly and Bob Holman make up some Airborn 1600 plans and short kits.
Got started a couple of days ago and I am making progress.
Building season is here and the wind and snow are blowing outside the shop door. I really like to build and like helping out my SAM buddies.
These are some quite large models even for SAM but if we can get a good power match up, these should be very competitive.
For the most part the larger a well designed airplane is for SAM competition the better they perform in lift and LIFT is what it is all about in the type of
competition SAM events are.
Find the thermal, climb and Soar is the name of the game.
Also the larger the model the easier it is to see and altitude, We often have these Airborns flying up at 3000 to 4000 ft in competition which is verified by the onboard Altimeters we carry, at that height they get mighty hard to see and seeing them and how they are flying is crucial.

Here is a build log for these Airborns
Posted by Jay Burkart | Dec 13, 2010 @ 09:04 PM | 3,188 Views
OK, enough grief and self pity.
Back to work.
Been building a number of SAM competitions airplanes.
Built a Airborn 280 sq in for Speed 400 LMR for Hank,
Built two Heeb Wrens's at 134 Sq in for SOS, one for me and one for Hank.
Got them both all framed up and ready to cover, waiting on Hank to get his servos and connectors squared away.
May be able to crack the 4oz RTF weight. Maybe one will come out
at under 3 oz RTF.
Also finished up and covered a Super Buccaneer for Jack.
All I have to do it to put on the tail feathers now.
In the last week started on 3 Airborn 1600 sq in. Got the Vertical stabs and Horizontal stab finished.
My gosh they are big, the stab alone is over 3 ft span.