Grumman Ag-Cat Crop Duster Plans

Grumman Ag-Cat Crop Duster Plans

Designed in 1955, the Grumman Ag Cat was the primary function constructed Agriculture airplane provided by a serious plane producer. The primary G-164 Ag Cat flew on Might 27, 1957. Over time, the rights to manufacturing have been modified palms a number of occasions with the manufacturing of Ag Cat’s totaling 2,455 airplanes from 1959 to 1995. Throughout that point the airplane was fitted with a number of piston engine sorts, and finally upgraded to the PT-6A, 750 horse energy Turbo Prop configuration. The turbo powered Ag Cat has a 42’ 4 1/4” wingspan, is 27’ 7 1/4” lengthy and a gross flying weight of two,020 lb. The Ag Cat has a most pace of 157 MPH, cruises at 130 MPH, and a stall pace of 64 MPH.

The Mannequin

Designed by Pat Tritle, the Mannequin is 1/12 scale, and is of the sooner model powered by the Pratt and Whitney R-1340 radial engine. The concept behind the design was to provide a lightweight weight Park Flyer sort scale mannequin that may be flown in smaller venues with scale-like efficiency.

Energy is offered by a Suppo 2212 or E-Flite Park 400 Outrunner motor, with 4 ch. R/C management. For many who like somewhat extra energy, the Suppo 2217 (950 KV) or E-Flite 450 and a 2S 1800 – 2100 mah battery.

Development is primarily of Balsa and Lite Ply. The fuselage and tail part are of the everyday “stick body” fashion to maintain them gentle and robust. The wings are of the “egg crate” fashion to maintain meeting fast and easy. As compact because the mannequin is, it ought to by no means want to return aside beneath regular circumstances, however to help in ease of transport and discipline meeting when essential; the wings are detachable in pairs by plugging them into the fuselage and prime wing middle part and are retained with a small piece of clear tape. The fuselage servos and battery are accessed by way of hatches on the fuselage backside. The aileron servos are constructed into the wings with the higher and decrease ailerons linked with a hyperlink rod.

Constructing the Ag Cat

Start by slicing out all of the elements utilizing the offered Sample Sheets. For many who desire Laser Lower elements, a Wooden and Plastic Pack can be found from

Tail Part Meeting: Body the Vertical and Horizontal Stabilizers immediately over the plans utilizing the wooden sizes proven. With framing accomplished, elevate the assemblies from the board and sand to form. Lower within the hinges, however don’t glue them in till after the frames are lined.

Wing Meeting: The Wings are constructed immediately over the plans. Beginning with the High Wing Middle Part, pin CM1 & CM2 in place on the plan, adopted by the Primary Spar, Ribs and Trailing Edge elements. Match and glue the Main Edge in place to finish the fundamental meeting. Elevate the meeting from the board and sand to form. And at last, match and glue the 5/32 O. D. Aluminum Receiver Tubes in place.

The High Wing building begins by pinning A7 & A8 in place on the plans. Dry match the Ribs/Spar meeting collectively, then pin it over the plans and glue every level of contact. Align and glue the Main and Trailing Edges, Wing tip Plates and 1/16 X 1/8 Balsa span smart High Stringers in place.

The Ailerons are constructed immediately into the Wing Meeting. Begin by sanding the bevel into A6 utilizing the Rib Element Drawing as reference. Construct up the aileron, and when full, take away the wing Meeting from the board and sand to fundamental form. Take away the Aileron from the panel and sand to remaining form.  Lower within the hinges, however don’t glue them in till after the frames are lined. And at last, Match and glue the 1/8 O. D. Brass Joiner Tubes into the wings to finish the Wing Meeting.

The Backside Wing Panels are constructed the identical because the High, starting with pinning SM2 over the plans. Body the panels because the High Wing was constructed, after which add the A9 & A10 Strut Mounts flush with the highest floor of the Wing.

The Root Fairing is constructed up from RFT & RFB utilizing the R1 Rib Element Drawing as reference. When the Panels are accomplished, sand to form, reduce within the Hinges and add the Brass Joiner Tubes to finish the meeting.

Fuselage Meeting:   Construct each Fuselage Aspect Frames immediately over the Plan utilizing the half numbers and wooden sizes proven. Word that B4 is positioned on the R. H. Aspect Body, glued flush with the skin fringe of the body. Earlier than lifting the Body from the board, mark the placement of formers 3A & 5A on B1. With the Aspect Frames accomplished, align and glue B2 in place on every body — make certain the elevator Pushrod exits on the R. H. aspect. Then, rigorously crack the Frames on the areas proven and gently bend the angles in as proven on the High/Backside Framing Plan.

Be part of the Frames by pinning them in place over the Framing Plan proper aspect up. Align and glue Formers 3, 4, & 5 in place on the body. Pull the aft finish of the Body collectively, align and glue the tail put up. Take away the Body from the board, align and glue 3A & 5A in place on the marks made earlier adopted by every of the higher and decrease Formers on the aft fuselage part.

Align and glue Formers 1 & 1A in place. Construct up Former assemblies 2 & 3 utilizing CS1/CS1A and CS2/CS2A and glue in place. Make up the Touchdown Gear Mount Beams from 1/8 X 1/4 agency Balsa and glue in place. Former 2A gained’t be glued in till after the Touchdown Gear is in place. Bend the Touchdown Gear parts utilizing the offered patterns. Tape the struts in place on the mount beams, after which wrap the joints with high quality copper wire and solder. Lash the Touchdown Gear meeting to the mount beams with thread and safe with a drop of skinny Cya. Now Former 2A is glued in place adopted by all the Fuselage Stringers.

Lower the Stringers on the Hatch Areas, after which construct up the Battery and Servo Hatch Covers from .010-inch Styrene utilizing the Element Drawings offered. Construct the Tail Block Fairing Jig and tack glue to the Fuselage and carve the Fairing Blocks from Blue Foam or smooth Balsa blocks. Construct up the Cover Meeting and take a look at match it to the Fuselage, however don’t glue it in place till after the mannequin is roofed.

Arrange the Servo Rails as proven on the plans, mount the Servos and run within the Elevator Pushrod and Rudder Pull/Pull cables. Tape the Rudder in place on the Fuselage, tie off the cables, after which mark the precise location on the plans the place the cables exit the fuselage – this info will are available in very helpful after the mannequin is roofed. Mount the Servos within the Wings utilizing Silicone Caulk and put aside till dry, after which run within the Extension Leads.

Construct up the Motor Mount and glue it in place on the Firewall. Lower the Ahead Fuselage Fairing block from blue foam or smooth balsa, glue it in place and sand to form. Mount the motor and ESC and take a look at run the motor to insure correct route of rotation.

Becoming the Wings:  The Cabane and Interplane Strut assemblies are constructed up immediately over the plans utilizing the offered element drawings. Pin the Alignment Jig onto the fuselage middle line, match the Cabanes into the Fuselage and slip the Middle Part over the struts.

Plug the wings into the Fuselage and High Wing Middle Part adopted by the Interplane Struts. Every thing must be lined up fairly properly, but when a little bit of adjustment is required, make it now whereas it’s nonetheless simple. As soon as the wings are correctly aligned, disassemble the mannequin and do a great element sanding and the mannequin might be able to cowl.

Protecting the Ag Cat: The mannequin is roofed with Microlite, however for the purist, this is able to be a terrific candidate for gentle Silk Span and dope. Both method, cowl all of the frames — besides the highest of the High Wing Middle Part — and add the specified trim. Customized Trim might be ordered from Callie Graphics at, or make up your personal utilizing you favourite methodology.

Then as soon as the quilt is in place, construct up the Vac-Shaped radial engine and element as desired. I added the consumption manifolds and push rods utilizing aluminum wire, and exhaust stacks from aluminum tube. The spark plugs are bits of plastic tubing with the secondary leads produced from smooth electrical wire. You’re in all probability going to wish a little bit of nostril weight anyway, so that you would possibly as properly add it with element, proper?

Closing Meeting: Start by pinning the Wing Alignment Jig again on the fuselage. Slip the wings in place adopted by the Interplane Struts, and as soon as every part is sq. and true, safe the C-Part on the cabanes with a drop of skinny Cya. Then add a drop of 5 minute epoxy at every level of contact. Now, take away the wings and canopy the highest of the C-Part.

Make up the Hinges from skinny Cya Hinge Inventory and glue in place utilizing Cover Glue. Middle the Servos and make up the aileron push rods from .032-inch metal wire with a Z-Bend at each ends. Align the ailerons and glue the Management Horn in place adopted by the higher and decrease Hyperlink Rod Horns. Match the Wings again onto the Fuselage, align and glue the Interplane Struts in place adopted by the Vertical and Horizontal Stabilizers. Arrange the Rudder and Elevator management techniques. The Aileron Hyperlink Rods are constructed up from metal wire and aluminum tubing, aligned on the mannequin, and secured with a drop of skinny Cya prime and backside. Now you possibly can join the Rx and arrange the management throws as proven on the plans.

Including the Flying and Touchdown Wires: DON’T skip this step! The mannequin isn’t designed to be self supporting, and flying it with out the rigging will possible as not finish in catastrophe. The rigging is made up from nylon carpet thread, and is run in per the instruction on the plans subsequent to the Fuselage Aspect View on Sheet 1 of the plans.

To complete issues up, glue the Cover Meeting in place adopted by the home windows and paper fairings. Mount the wheels, and dummy radial engine and add any desired particulars to finish the mannequin. The battery tray is made up from Lite Ply and glued in place between the Firewall and entrance Touchdown Gear Mount Beam.

Safe the battery to the Tray with Velcro. Stability the mannequin on the level proven on the plans, and if a bit extra nostril weight is required, go along with both a bigger battery, extra dummy engine element, or a little bit of ballast. And at this level, the Ag Cat is completed and able to fly.

Flying the Ag Cat: Despite its brief couple, stubby, and gangly look, the Ag Cat may be very simple to fly and is extraordinarily steady. Its solely draw back is that the Elevator generally is a bit delicate to enter, so with the controls arrange as proven, begin out with the twin price on for the preliminary take a look at flights. Floor dealing with is not any downside, and as soon as within the air the ailerons exhibit little or no antagonistic yaw, and although somewhat rudder enter is rarely a foul factor, it’s actually not essential. And wait until you see how regular she is in these low “Duster Passes”. I used to be stunned at how properly the mannequin penetrates within the glide too, however for the standard strategy, landings require somewhat energy on the glide slope, however as soon as in floor impact the mannequin will float somewhat proper earlier than landing, so don’t be stunned if the primary couple landings go somewhat lengthy.

And that’s all there may be to it. The Ag Cat is a good construct and a terrific flyer, so don’t let the odd proportions scare you. It truly is a delicate and forgiving platform, and despite its comparatively small dimension and light-weight weight it’ll deal with these gentle breezes properly too.

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