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FLYING YOUR SIG CLASSIC

 
Now you are ready to fly your plane, and FLYING is what the Sig Classic models are designed for. Most models as realistic 
looking as your Classic make poor flyers. They're often tricky to adjust and clumsy in the air. But Sig's Classic kits give you 
three important features that assure you of successful flights: 

1. A PROVEN flyable design.  
2. A reliable way to make flight adjustments.  
3. Complete flying instructions. 

 
Read and follow these instructions carefully. They are the key to satisfying flying.
 

Testing And Adjusting

 
You have invested a lot of time and effort in building your model, don't waste it all now with careless testing. Most models fail to 
fly because of poor adjustment, not poor craftsmanship. Be as careful in your testing as you were in your building. 
 
Every model is a little different and needs its own special set of adjustments. Contest winning flyers make dozens, even 
hundreds, of test flights "trimming" a model for best performance. So don't give up if your first flights aren't perfect.
 

Preflight Preparations

 
Before you leave the workshop for the flying field, take these important steps. 
 
Looking from the front of the model, check that the bottom of the wing and tail 
surfaces are flat - not twisted. Sight down the center line of the fuselage as shown 
in the drawing. Right and left wing should look alike; you shouldn't see the top of 
one wing and the bottom of the other. The fin should point straight ahead, and the 
stabilizer should be flat. (This does not mean that the stabilizer and the wing sit on 
the fuselage at the same angle. The wing will be tilted upward more than the tail).

 

 
 
A model can be made to fly with twisted surfaces, but it's confusing to adjust and if 
the warps change from day to day, you can't detect it. The drawing shows how a 
surface can be straightened by twisting it in the desired direction while holding it 
under a heat lamp or other electric heater. Work with it until it is as flat as possible. 
If your wing has struts, loosen them before bending and re-cement them afterward.

 
The correct "Balance Point" for your ship is shown on the plans. Mark this point on 
the bottom surface of each wing. When supporting your plane on your finger tips at 
these points, the fuselage should hang level. See the drawing. Add weight to the 
nose or tail until it DOES hang level. Don't be afraid to add the necessary weight. 
CORRECT BALANCE IS MORE IMPORTANT THAN LIGHT WEIGHT. 
 
Modeling clay makes handy balancing weight - it can be pressed permanently in 
any corner. Wire solder or BB shot can be used by cementing in place.

 
If one blade of your propeller always swings to the bottom, a tiny smear of clay on the other tip will improve the prop's balance 
and reduce vibration.

Summary of Contents for Customaire SIGFF26 Classic Series

Page 1: ...mall scissors are the best tool for cutting out plastic parts While cutting hold parts so that the trim line can be seen clearly Double check with the instructions to BE SURE YOU ARE CUTTING ON THE RIGHT LINE The edges of the shells and the back surface of the completed cowling assembly can be finished flat and accurate to the desired line by rubbing them across a sandpaper block Go slowly and car...

Page 2: ...essary to prevent wobble Cowling Assembly There is no trim line on the cowling and dummy motor Just cut from the sheet leaving a small rim around the edge like the brim of a hat Carefully trim the round center disc from the dummy motor Remove the small lip at the trim line leaving the center ring smooth and flat Apply cement to one surface of each N 2 and place one inside and one outside the cowli...

Page 3: ...y 7 shock strut strips from typewriter paper Also cut two 1 1 2 squares from wax paper Wrap a lower strut in wax paper and then wrap a paper strip snugly around the outside thoroughly cementing the layers of paper together as you wrap When cement has started to set up the wax paper will allow the shock strut to be slipped off the form Discard the wax paper When shock struts have dried completely t...

Page 4: ...same Covering Cover all parts before final assembly Windshield must be added after the upper wing is in place Do not shrink or dope the wing or tail unless they are pinned down on a flat surface while drying Use Sig Lite Coat Dope only WING SURFACES MUST BE FREE OF WARPS OR THEY WILL NOT FIT PROPERLY IN FINAL ASSEMBLY Final Assembly Don t try to cement parts to the paper covering Wherever parts ar...

Page 5: ... trailing edges butt against the ends of the cross pieces S Insert the bottom tabs of the N struts into the slot between the double ribs in the lower wings The struts should fit against the ribs without distortion Struts can be moved forward or backward slightly in the slots or sprung a little for improved fit If wings are well aligned and struts still will not fit the struts will have to be trimm...

Page 6: ...enter line of the fuselage as shown in the drawing Right and left wing should look alike you shouldn t see the top of one wing and the bottom of the other The fin should point straight ahead and the stabilizer should be flat This does not mean that the stabilizer and the wing sit on the fuselage at the same angle The wing will be tilted upward more than the tail A model can be made to fly with twi...

Page 7: ... angle of the stabilizer by changing the thickness of the incidence block under it Lower the front edge or raise the rear edge See drawing But make SMALL changes 1 32 at a time If a change of more than 1 16 is needed go back and perform the Preflight checks again It s likely your Classic is incorrectly balanced tail heavy or the surfaces are warped Diving A model that darts quickly into the ground...

Page 8: ...of the shim behind the noseblock until power flights are smooth and free of stalling with 150 winds in the motor Don t wind the motor any tighter until the lower powered flights are under control Power On Turns Because of the effects of the rotating propeller models usually turn better in one direction than the other Your plans will say which way to circle Don t circle any tighter than necessary C...

Page 9: ... a more complicated two man operation but gives longer flights Before a motor can be safely stretch wound it must be lubricated Rub a few drops of Sig Rubber lubricant into the rubber AFTER the knot has been securely tied Use just enough to make the motor barely damp If it s too juicy it will splatter all over the inside of the fuselage Next make a strong wire hook like a teacup hook and lock it V...

Page 10: ...technical support 1 641 623 0215 SIG WEB SITE www sigmfg com Copyright SIG Mfg Co Inc SIG MFG CO INC Montezuma Iowa 50171 0520 LIMIT OF LIABILITY The craftsmanship attention to detail and actions of the builder flyer of this model airplane kit will ultimately determine the airworthiness flight performance and safety of the finished model SIG MFG CO s obligation shall be to replace those parts of t...

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