Sagitta XC Build, 2015

Oct 11  Something Extra

Wing Retainer Spring access Hatch

The hatch is spring loaded and the front is designed to pop up when the retainer pin is removed.

The retainer pin is accessible only after the Canopy is removed.

The canopy is held down at the rear with 6 Powerful earth magnets, and with a pin and corresponding hole at the front.

To remove the canopy just pull up at the rear and slide back.

At this point the pin is visible, and it is pulled forward

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and rotated so the end points up, which makes it easier to grab it and pull forward and remove.

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The hatch has know popped up and can be pulled forward to release the rear tongue from the fuselage.

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Tow Hook and Rubber skid strip

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Oct 09

Tuit Fini

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sagitta-xc-02

Jump on board for this build I reckon it will be the last for the winter 2014/2015.

Hopefully I’ll be able to show the scale of this ship as I go along.

 

Box Info

Uses Eppler 205 airfoil for unmatched penetration and superior L/D for Cross Country or Thermal Duration Flying

Technical Data:
Wingspan 14 Feet 6 Inches
Wing Area: 2100 Square Inches Effective
Flying Weight: 8 lbs, Unballasted
Aspect Ratio: 14.4:1
Airfoil: E205

Deluxe Kit Features:
All parts precision machined’
Four piece wing design inner panels  —- ” outer ___  ”
Complete hardware package
Releasable contest towhook

 Other

Hitec HS- 85MG  for the two spoilers

Hitec HS-5645 for the stab

HS-5245 for the rudder

white painted fuse

MPX connectors at wing root

Thankfully it’s a 4 piece wing

also using a FG fuse extended by 6″ in length over the original kit fuse.

Colors

–  the canopy is chrome.

– add a white stripe (6-12”) on the outer panel root, both tips, bottom only  (6 bays and the sheeting at the tip panel root)

Hanu 965 Ultracote Lite Transparent White

– the rest is Hanu 955 Ultracote Transparent Violet


 

A few more pictures of the kit, the fuse and some of the electronics for the inside.

Fedex made it, once again with a big truck

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Big box , almost as high as the door

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The inside, everything is well packed and protected

P1160875-001The fuselage 2 pieces with CF strips for strength

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Wing rods and towhook

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Servos and switch

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Kit box

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Contents

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Feb 13

Yes, you guessed it, we get snow in Febuary.  I took this pic with an Lumix LX3 mounted on a 2 M spectra

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Digging thru some of the parts, here are the ribs for the tip panel. Tip panel build is like the Sagitta 900 as the lower sheeting and rib caps are placed on the board 1st, and then the lower 1/8 x 3/8 spar and ribs are added.

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Main panel ribs are two parts, and that means the main spar is built up first

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Contents of one of the parts bags, as far as I can tell the only thing missing is the 2 grub screws that fit into the 1/8″ collars..

Pretty good for a kit that’s been laying around for 25 – 30 years

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sorting thru the tip panel parts, spars trailing and leading edge sheeting and caps.

Most parts need to be cut, so I do that in pairs that way left and right panels are the same.

Of course a scale is present, it’s not to late to weigh pieces and match for equal weights of tip panels.:)

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Tip panel rib set, the root rib is marked up a bit on the top , likely from loose wing rods within the box. It will work fine and will eventually be covered. The spars are an accurate 3/8 wide, and a quick check confirmed all slots in the ribs are accurate and fit really nice. Notice the progression, in the leading edge of all the ribs as you go from root to tip rib. The last rib W 16 is not perpendicular to the spar therefore it is flush with the previous rib W 15:):)

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Feb 14

I just noticed the two springs which are part of one of the parts bags. Without looking any further I reckon they are used to hold the wings to the fuselage.  There’s also some screw in eyelets that are part of the system.

:)

That gets me thinking, the wooden fuse has a hatch on the top , that allows access to the springs as well as to a spoiler servo which is all part of the original plans.

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Here is the Sealy FG fuse, I may find myself cutting an access hole here between the wing roots. a whole lot easier to get at a couple springs.

 

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Earlier I said the tip panels are buit up like the Sagitta 900, turns out that is incorrect. The Sagitta 900 did not have rib caps on the underside, also the XC has built up trailing edges. This setup is typical of the Aquila’s

 

It’s still winter here.

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Right tip panels, all bottom sheeting in place and trailing edge sheet with taper

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Right outer panel

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Lower spar added

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Set of ribs placed

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Other set of ribs  for left panel. interestingly the left tip panel is shorter on the plans then the right panel. Marking the bottom spars and lower leading edge sheet for rib and rib cap placement will yield two same size panels.

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A little detail for the main panels

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Feb 15

Top panel ply root cap and joiner tube

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Right tip panel showing ribs

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Upper spar set and held down flat with a 4 ft level and some weight

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Leading edge of ribs W16 requires trimming prior to placing the LE spruce

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Top spar is added to left tip panel

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Right tip panel trailing edge webbing is added hear, needs to be trimmed later

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Leading edge trimmed and glued in place

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Trailing edge web filler is trimmed and sanded flush with ribs

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April 15

Stab set pieces, where there are 2 pieces  I make them up 1st, and make sure they are equal length

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Stab setP1170136-001

2nd Spar, with lower 1/8 x 3/8 spruce filler, doubled at inboard endP1170137-001


April 18

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April 20

Stab set , missing top LE sheeting as well as some filler pieces

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April 22

Wing rod tubes are set on both ends of the main spar

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April 24

 

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May 01

Wing main panel bits and pieces, some ribs need holes for spoiler servo wire as well as notch for spoiler blade clearance

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All stacked up, and notched for spoiler blade clearance

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Spoiler servo and all ribs which need 3/8 or so hole for wire

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May 5

Main panel spars complete with full length ply front and rear. These , after a little clean up are ready to be placed on lower 3/32 sheeting and cap strips.

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An ad for the Sagitta XC from 1982, also shows some info on the 600 and 900

SagittaXC fr 1982


May 08

Main wing panel lower sheeting and rib cap strips.

12 rib cap strips per panel all cut to the same length. They fit in between the LE of the rear lower sheet and the TE of the front lower 3/32 sheet. There is filler sheeting added at both ends of the panel.

The main spar is then set on all this.

All sheeting usually develops a twist or some type of warp over time, so I cut or sand the edges to get them straight or as with the TE sheet straight and parallel at both edges.

The TE lower 1 7/8 wide sheet, also gets a taper sanded in at the rear edge.

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May 09

Inboard and out board end filler 3/32 sheet

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Trailing edge lower sheet gets the final 7/16″ over the full length beveled

 

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ALERT

Somethings up here, the spars are longer then the drawing , oops

Either the 1/16 ply sides on the spars have stretched, or the plans have shrunk

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I am gonna think the latter, and re-space the lower rib caps and the ribs accordingly..

The good news is , I hadn’t yet cut the lower LE and TE sheeting to length.

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May 10

Ply lower root gusset, Aquila Grande also has this gusset. This one is 3/32″ whereas Aquila is 1/16

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Lower rib caps and trailing edge, left wing panel

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May 12

Lower sheeting and rib caps get added

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Spar gets added, right panelP1170253-001

 

Rear rib sections in place

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Left wing panel

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May 13

The stack of forward rib halves comes in handy to mark the LE sheet for individual location

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10 of the rib pieces needed holes added for the ballast tube carrier

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Forward rib pieces in place.. The inboard end plywood forward ply ribs will have to wait, as the ply gusset needs to be wetted down in order to conform to the shape.

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May 14

Fitting of drag and sub- spar, notched need to be added for the drag spar

 

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LE spruce in place

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Notched left panel drag spar added next

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Underside right panel

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Left wing panel drag sparP1170277-001

 

Right wing panel, and the fun begins 393 Grams, I’ll be able to compare tomorrow when I get the other panel up

 

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May 15

Weights, after todays adds, 9 G difference , that’s a 1/3 of an Oz or so, I’m sure I’ll be able to sand that out later.

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Both main panels stuck together and out for some fresh air. Up against my B of T , you can see how massive these wings are gonna be. I believe the Bird of Time is 117″ or so wingspan

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I set a straight edge against a sheet of 3/32 x 4 x 48, which I have to cut twice to 1 7/8 wide for the top TE pieces. There’s quite a wow in the edge, thankfully there’s enough width so I can cut this out

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Ballast tubes in place, they are cardboard and hold a brass tube which is later filled with titanium, uridium, lead  whatever in order to ballast this puppy. The inner ends are capped with balsa, and still need to be pinned as a failsafe..

 

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May 16

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May 17

Some fuselage detail

The fuselage is in two parts and the joint required considerable sanding and fitting to get a good fit.

No holes are present for the wing interface or for the horizontal stabs. That’s all details that need to be measured and measured twice as there are no do overs with this.

Everything needs to be square and plumb and vertical and horizontal, as well as perpendicular, as test pilots and others can spot misalignment from 10 paces   :)  :)

 

Besides planes that fly crooked are just not quite as pretty.

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I am really pleased the way the wings fit up to the fuse. The wooden fuse for this  sees the top surface of the wing flush with the top of the fuse. The FG fuse has a radiused corner there maybe 1/4 – 3/8 radius  so the wings are not flush with the top of the fuse.

 

Minor difference, it will fly better

 

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May 18

The wings are drawn tight to the fuse and held there with a couple springs. These springs are located between the two wing rods, and access to these thru the canopy opening is not possible.

So, I’ve cut a opening which will later get reinforced on the underside. I will fashion a hatch cover later from 1/16 plywood

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1/8 ply formers are needed at each of the wing rod tubes

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Also a couple formers to support the servo tray.

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May 19

Opening frame

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Servo tray formers and servo tray

 

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Tail boom formers, made from lite ply, needed to support control cables for the rear tail feathers.

System needed to put these in place along with the nylon tube as the fuselage halves are put together.

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May 21

Shear webbing on one of the tip panels

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Stab cable drive endP1170315-001

Securing pushrod tubes to the fuse, there’s a bulkhead every 6 inch, and glue every 3 inch

Interesting :):)

 

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Fin opening, fin post and hinges will be added later.P1170319-001


May 22

Left and right tip panels at root with wing rod tube in place..

Needs to be filled and capped and root balsa rib needs to be added

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Rear fuse section, slowly making my way to the joint with former placement

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May 23

Top panel balsa  root ribs and ply ribs

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Leading edge requires shim to conform to lower rib profileP1170325-001

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Careful sanding is needed for a good fit of the two panelsP1170328-001


May 24

Left tip panel join, and ply ribs

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one view shows rear shear web on tip in 3 places the other tip panel view shows it in four, plans call for 3 places.. :):):)

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TE sheetingP1170332-001 P1170333-001

LE sheeting down and secureP1170334-001

Tip block gets marked and shaved prior to glueingP1170335-001

Tip block and profile templateP1170337-001

Rib cap strips

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May 25

Tip blocks

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Tip root top filler sheetP1170348-001

TE spruceP1170349-001 P1170350-001

after a little shapingP1170351-001


May 26

Top sheeting , main panels

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May 27

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May 29

Spoiler magnets and stop/adjusters

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Adjuster being glued in from underside

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TE Spruce capstrip set to be glued P1170366-001

Clean spoiler servo bay and spoiler , right main panel

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June 1

Sooner or later ya start running out of lumber. There was a lot in this kit, but other then the canopy I need no more lumber. Shaping up next and what better then to start with the 4 spruce trailing edge caps. They need to be tapered to what Renaud describes as a sharp edge.

I have in the past tried planing , sanding, taping and  filing , planing and sanding, and always seem to come back to my machinist clamp with a strong USA made razor blade.

I set the blade at the app. angle and just extended far enough to get to the edge of the cap where it meets the balsa.

I then use it up against an edge for support and carefully scrap the material away. Finally I can use my sanding blocks for the finishing touches.:):)

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June 3

Fin tail post and stab pivot block

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Fuselage halves setup, aligned and glued togetherP1170386 P1170387 P1170388 P1170389


June 4

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June 5

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June 7

Hatch and Canopy build

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June 14

added some lead and battery to balance at recommended CG

Plane weighed 3340 G

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June 24

Wing Tip Panel weigh in.

Sanded and ready for covering

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Aug 12

FG fuselage sanding and filling of voids. I’ll get a coat of primer on and that should show other imperfections

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Sept 10

4 sheets for the inboard panels top and bottom

4 sheets for the stabs and 2 for the rudder

Looks like blue, (flash) actually is a really nice violet

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Tip panel bottom scheme

Top fully violet

tip panel bottom

Top panel, white with violet, should be bright

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Sept 11

Before and after vertical stab weight, starting to get heavier 5 G in the tail is 15 to 20 in the nose

Maybe I should reconsider covering this :):)

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Sept 15

Wonderful kit, great parts, but a lot of sanding and fitting to get the wings to this stage and have them look the same.

A leap of faith, I hope the darn thing flies straight.

The Fuselage was a little out of my control but appears to be straight as an arrow.

 

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Sept 21

After a couple covering sessions, I took this beast out for a photo session, it is huge

 

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Sept 26 2015

Near the end , I’ve already added the second coat of primer to the fuselage, and in the process filling a multitude of pinholes.

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I have a few more pinholes to fill, and then onto the third coat of primer.

In the mean time I’ve added the servos to the spoiler bays and extended the servo arms. Surely this build is nearing the end.

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Sept 30

Soon time for the big dance , 3rd coat of primer is on

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Oct 05 2015

Brass Stab pivot tube  in place, always a bit of a gamble measure from wing tip to stab tip ,set the stab level with the wing and glue, this always sums up the build in my view. :):)  Is it level with the wing , square to the fin.

 

Sometimes it’s in the eye of the beholder , or the builder.

 

Lets see if it flies?

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Shiny stabs

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Oct 08

Final coat of white finished.. Looking sharp

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Next up fuselage fit out, servo and pushrod install and completion

 

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