Sagitta 900 Build 2016

Jan 28 It’s a bit chilly outside, but took the opportunity to put the Sagitta 900 together and snap a few pictures

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Jan 05

All the bits and pieces have been taken care of

install servos

install rubber landing strip

install 2 eyes to secure wings

 

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Dec 28

A splash of red and yellow has been added to the wings. The spoilers need fitting and covering. Soon this will be complete. :)

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Dec 15

After Paint I can say that each coat of paint on the fuse adds 4 – 5 Grams. all up less then an once for Complete Paint,. Likely heavier then Ultrakote, but more Durable I would say  Red, yellow . white Ultracote will be here tomorrow, so soon the wings and tail feathers will get coveredp1190211 p1190210 p1190209

Nov 16

After 3 coats of paint and sanding I have added between 4 and 5 G per coat, the weight now is 285 Grams. I sand with 100 to 120 grit and a block, the closer you get to smooth and flat the more effort it takes.

Water paper would also work, but this time I’m sticking to garnet paper, and cleaning it to prevent clogging of the grit on occasion.

Is paint really that heavy :):)

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Nov 09

Sanding, sanding other project, today though I got a 1st coat of Paint on the Fuselage.

Weighed the fuselage, servo cover and hatch as well before painting.  Weight 271 Grams

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Oct 18

Option

 

 

Oct 16

Some more of the build at sanding stage now, little else to cobble together. Have built a set of stabs as well which are almost double the stock stab set thickness.

 

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Stack of stuff no batteries or receiver 947 grams
thick-stab
New stab set 32 Grams .

 

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Stack of pieces, 947 Grams
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couldn’t find a set of these anywhere so fashioned a new set
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a little heat formed these bends nicely on the spoiler string tubes
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have to fashion a set of stabs a tad thicker then those with the kit.
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a frame with some sitka on the TE and some hard balsa on the LE, I will sheet the root with some 3/32 balsa, cap some ribs and see how that works
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kit of spoiler stops, and magnets

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Sept 28

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Trailing edge shaping, getting a taper like that of the 1 x 1/4 balsa in front of it
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Wing rod tube pine carrier, root angled in and tube down
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I added a bit of a notch to the 3/8 web filler to accommodate the wing rod tube length
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4 ribs on the inboard end need to be cut to fit on either side of the spar
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lower diagonal brace ends get a double bevel trim before getting glued into place
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wing root to fuse fit
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the rear shear web doubler is higher then the front one and sits flush at the bottom with the lower rear sheeting
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I extend a line onto the lower edge sheeting , inboard end to aid with placement of LE spruce

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Sept 24

 

 

p1180986
Wing rod tube, block, and spar doublers. A complicated collection of pieces
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Rather the pin the lower spars down in correct position, I just placed them against a straight edge, and glued the lower d tube sheet to the forward edge. This allowed me to place the unit in the proper location and pin thru the balsa rather then the spars. As long as the unit was pinned in place straight the ribs would later pin everything down tight to the board

 

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Sept 21

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Forward fuse bottom sheet, with the center line on the inside and the former centers all marked alignment is a little easier

 

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bottom balsa 1/8 sheet
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3 ribs each side get notched for spoilers

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Sept 16

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Top 1/4 fuselage deck in place, notched to fit between fuselage sides
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notches on underside
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tow hook channel centered and appropriately placed for/ aft
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fuse weighted down for placing of rear top sheeting

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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fin/ fuse interface, angle top sheet to fit
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top sheet in place and weighted down

 

 

 

 

 

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3/32 fin side sheeting

 

 

 

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Fuselage top sheet

 

 

 

 

 

 

 

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fin side sheeting marked for pivot pin as well as control rod arc opening

 

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Spoiler servo access hatch pieces
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Access hatch framed and fitted

 

 

 

 

 

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top sheet filler
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1/16 ply sheeting on access hatch

 

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wing spars 1/8 x 3/8 with weights marked
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canopy rear , I like to add a piece of 1/8 ply here for wear

 

 

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canopy rear tongue

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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wing sheeting 1/16″ as well as weights
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nose, needs a little shaping
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1/4 dowel for retainer screw
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1/4 ” balsa plug
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some shaping

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


 

 

 

 

 

 

Sept 04

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forward formers in place
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Tow hook rail, and mounting plywood

 

 

 

 

 

 

 

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Servo tray rudder and stab
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Rail support pieces glued together

 

 

 

 

 

 

 

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Sept 03

 

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Fin frame and 3/32 fin sheet. It was a bit of a mystery initially as I thought there was no fin sheeting. Turns out the 3 –  3/32 trapezoid pieces are scabbed together to get the shape for the fin sides, I’ll add the holes and slots later
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Fin frame glued to right fuselage side

 

 

 

 

 

 

 

 

 

 

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adding the stab control tubing
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Former gussets from 1/4 tri stock

 

 

 

 

 

 

 

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Tri stock gussets are glued in place to the lines which were previously added to the inside of the fuselage sides

 

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Glued and pinned in place

 

 

 

 

 

 

 

 

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Former F5 wing rod tube, former gets placed and glued, sdquare to both fuselage sides, with fuses sides held flat to build surface
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Fuse at rear gets glued together and aligned perpendicular to build surface

 

 

 

 

 

 

 

 

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Former F7 added and fuse square and straight
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Nose bock, I have hollowed it out somewhat for lead

 

 

 

 

 

 

 

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Nose block glued in , line at middle above line on board, I also have lines on bottom center of all Fuselage formers
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Nose block clamped

 

 

 

 

 

 

 

 

 

 

 


Aug 27

Rudder Build

 

 

 

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Laying out some of the sticks, the trailing edge and LE are laminated balsa and spruce
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The 3/8 wide rudder post gets glued to the forward rudder sheet

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The forward bottom fuselage sheet has got a nice twist in it, so it’s something I’ll have to watch for. If I line the edges up I’ll have a banana

 

 

 

 

 

 

 

 

 

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May 03 2016

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MKS servo, they’re supposed to be great and reliable, 3 servos rudder, stab and spoilers.

The Airtronics Kits are great Kits, and getting harder and harder to find

This 900 will have MKS HV6100 Servos all around, with a single servo to activate the spoilers via dial cords

Colors will be white, red and blue :)

 

Thinking 1 tip with red , white and blue stripes, as symetry only adds to the confusion when flying.

American flag ish possibly!

Above 1000 ft who cares, the gallery is no longer watching, and all colors become one at that distance, but on the ground especially on the top this pattern should be really pretty

There’s gotta be a picture somewhere, when I find one I’ll add it in here.

Also consideration will be made to build a second set of stabs with some more thickness then the stock stabs.

First Flown in the Late 70’s

Amazing for a plane designed in Aug 78, and first flown in 79 on the 10th
anniversary of the Apollo 11 Landing

Just 8 days later Skip Miller set a best time on a F3B course of 9.39 seconds

The design surely has endured time, and when you find one at a field near you there’s usually someone having a look at the pretty lines.

 

 

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