Great Planes Ultra Sport 40 Kit - GPMA0410 - Manual (Page 43)

CAUTION (THIS APPLIES TOALLR/C AIRPLANES): If, while flying, you notice any unusual sounds, such
as a low-pitched' 'buzz", this may be an indication of control surface" flutter''. Because flutter can quickly destroy
components of your airplane, any time you detect flutter you must immediately cut the throttle and land the airplane!
Check all servo grommets for deterioration (this will indicate which surface fluttered), and make sure all pushrod
linkages are slop-free. If it fluttered once, it will probably flutter again under similar circumstances unless you can
eliminate the slop or flexing in the linkages. Here are some things which can result in flutter: Excessive hinge gap;
Not mounting control horns solidly; Sloppy fit of clevis pin in horn; Elasticity present in flexible plastic pushrods;
Side-play of pushrod in guide tube caused by tight bends; Sloppy fit of Z-bend in servo arm; Insufficient glue used
when gluing in the elevator joiner wire or aileron torque rod; Excessive flexing of aileron, caused by using too soft
balsa aileron; Excessive "play" or "backlash'' in servo gears; and Insecure servo mounting.
ULTRA SPORT 40 PARTS LIST
PART # QTY. DESCRIPTION_____
ITEMS PACKED INDIVIDUALLY
US40P01 1 Rolled Plan
US40P02 1 Instruction Book
CANPY041 1 Clear Plastic Canopy
MM40D90 1 40-Size Engine Mount (Drilled)
PLTB002 2 Plastic Outer Pushrod Tube
US40F01 2 Balsa 1/8 Shaped Fuselage Side
US40F22 2 Balsa 1/2 Shaped Chin Block
US40F23 2 Balsa 1/2 Shaped Top Front Block
US40W03 4 Bass 1/8 x 3/8 x 13-3/8 Spar
Doubler
US40W14 1 Balsa 3/32 Shear Webs (Pak of 18
Webs)
US40W21 2 Balsa 7/8 x 1-7/16 x 8-3/4 Wing
Tip
US40W22 8 Balsa 3/32 x 3 x 8-1/4 Center
Sheeting
BAL009 5 Balsa 3/32 x 1/4 x 36 Cap Strip
BAL019 3 Balsa 1/4 x 36 Triangle
WIRES16 2 Threaded Pushrod Wire (12")
WIRES 17 3 Threaded Pushrod Wire (34")
WIRES62 1 1/16 Pushrod Wire (18")
PART# QTY. DESCRIPTION
SUB-PACK DIE-CUT SHEETS (US40A02)
US40F11 1 Ply 1/8 DC F2A, F3, F4A, Gauge,
Web
US40F12 1 Ply 1/8 DC F2, F4, F5
US40F14 2 Ply 1/8 DC Fuse Side Doubler
US40F15 1 Ply 1/8 DC Chin Base, F3A,
Spacers
US40F20 1 Ply 1/32 DC Wing Fillet Bases
US40W16 1 Ply 1/16 DC Dihedral Brace, Bolt
Plate
SUB-PACK LONG STICKS (US40A03)
US40F32 2 Balsa 1/4 x 1/4 x 24 Turtle Dk
Stringer
US40W02 4 Balsa 1/4 x 3/8 x 27-1/4 Spars
(Hard)
US40W11 1 Balsa Shaped Wing LE&TE Set
US40W12 2 Balsa Tapered Aileron
US40W36 1 Balsa 1/4 Tapered Wing T.E. Jig
SUB-PACK LONG FLAT PIECES (US40A01)
US40F25 2 Balsa 3/32 x 3 x 25 Turtle Deck
Side
US40F26 1 Balsa 3/8 x 2 x 24 Turtle Deck Top
US40W09 4 Balsa 3/32 x 1-3/8 x 27-1/4 T.E.
Sheet
US40W10 4 Balsa 3/32 x 3 x 27-1/4 L.E. Sheet
US40F13 1 Ply 1/8 DC Fuse Top Front
US40F35 1 Balsa 3/32 x 3 x 16 Bottom
Sheeting
SUB-PACK DIE-CUT SHEETS (US40A04)
US40F17 1 Balsa 1/8 DC Fuse Top Rear
US40F18 1 Balsa 1/8 DC Lower Rear Fuse
Side
US40F19 1 Balsa 1/8 DC Lower Front Fuse,
F5A, F6A
US40W05 2 Balsa 3/32 DC Ribs 1,2
US40W06 2 Balsa 3/32 DC Ribs 4, 8.10
US40W07 2 Balsa 3/32 DC Ribs 3,6,11
US40W08 2 Balsa 3/32 DC Ribs 5,7,9
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