A 40-inch RC sport plane needs a motor near 1400KV on 3S, a 10×6 prop, 9 g metal-gear servos, and 1.2 mm pushrods. Match the motor mount to the motor size first, then the prop to the motor shaft. This guide lists the mounts, motors, props, servos, and linkage that fit a 40-inch sport airframe.
Which motor mount fits your outrunner motor?
Outrunner motors bolt to a radial mount that matches the motor case size. A G32 motor uses the 4250 radial mount, and an E400 motor uses the 2830 mount.
Measure the motor case diameter in millimeters before ordering. A 28 mm case takes a 2830 mount, and a 42 mm case takes a 4250 mount.
Which motor suits a 40-inch sport plane?
An E370 outrunner at 1400KV on 3S gives smooth sport power for a 40-inch airframe. KV means revolutions per minute per volt with no load.
An E450 motor at 2400KV suits a smaller, faster airframe on 3S. A 2836 motor at 1050KV suits a larger prop on 3S or 4S.
Which prop goes on a 40-inch sport plane?
A 10×6 electric prop is the common pick for a 40-inch sport plane on 3S. The first number is the diameter in inches, and the second is the pitch in inches.
A 9×5 prop loads the motor less and suits a higher KV motor. A prop saver in 3 mm, 4 mm, or 5 mm protects the shaft on a hard landing.
Which servos drive the control surfaces?
Use 9 g metal-gear micro servos such as the MG90D on ailerons and elevator. Metal gears survive landing shocks that strip plastic gears.
An SG92R analog servo works for light duty on a small rudder. A DSM-44 digital servo gives finer centering for ailerons on a fast airframe.
What linkage hardware connects servo to surface?
Z-style pushrods at 1.2 mm by 180 mm with adjustable stoppers link the servo arm to the control horn. Cut the rod to length, then lock the stopper screw.
Nylon control horns and clevises in 21 mm size fit standard foam and balsa surfaces. A control linkage hardware kit covers horns, clevises, and pushrods in one box.
What landing gear parts wear out first?
A 30 mm tail wheel assembly takes the most abuse on grass fields. Metal wheel collars lock the wheels on the axle and stop them sliding inward.
PU rubber airplane wheels from 2.25 to 5 inch fit most sport planes. Replace a cracked wheel before it binds on takeoff.
Frequently asked questions
What does 10×6 mean on a prop?
It means 10 inches in diameter and 6 inches of pitch. Pitch is the distance the prop would move forward in one turn through solid air.
Can I use a 9×5 prop instead of a 10×6?
Yes, if the motor KV is higher. A smaller prop loads the motor less, so pair it with a higher KV motor or accept less thrust.
How do I know which radial mount my motor needs?
Match the mount to the motor case size in millimeters. E400 motors take the 2830 mount, G32 motors take the 4250 mount, and G46 motors take the 5055 mount.
Plastic or metal gear servos for a sport plane?
Metal gear servos last longer on control surfaces that take landing shocks. Plastic gear servos are fine for a light rudder on a slow flyer.
Parts used
Radial Mount for G32 (4250) Outrunner Motor, $4.99. Radial Mount for G32 (4250) Outrunner Motor. motor size: 4250; mount type: radial (firewall) mount. Ships from NY, USA.
Radial Mount for E400 (2830) and E450 (2835) Outrunner Motors, $2.99. Radial Mount for E400 (2830) and E450 (2835) Outrunner Motors. motor size: 2830 / 2835; mount type: radial (firewall) mount. Ships from NY, USA.
E370 Brushless Outrunner Motor (2208 – 1400KV), $10.50. US stock, ships fast from NY, USA. GForce E370 Brushless Outrunner Motor (2208 : 1400KV). Size: 2208; Kv: 1400KV; Weight: 42g.
E450 Brushless Outrunner Motor (2835-2400KV), $24.00. US stock, ships fast from NY, USA. GForce E450 Brushless Outrunner Motor (2835-2400KV). Size: 2835; Kv: 2400KV; Use: 650g pusher prop racing planes.
2836-1050KV Brushless Outrunner Motor, $12.40. US stock, ships fast from NY, USA. GForce 2836-1050KV Brushless Outrunner Motor. Size: 2836; Kv: 1050KV; Weight: 77g motor only, 88g with mount/adapter.
10×6 (1060) Direct Drive Electric Prop (Pack of 10), $7.00. Gemfan 10×6 (1060) Direct Drive Electric Prop (Pack of 10). diameter: 10in; pitch: 6in; pack: 10 pcs. Ships from NY, USA.
9×5 (9050) Direct Drive Electric Prop (Pack of 10), $7.00. Gemfan 9×5 (9050) Direct Drive Electric Prop (Pack of 10). diameter: 9in; pitch: 5in; pack: 10 pcs. Ships from NY, USA.
3mm Prop Saver (2-Pack), $4.99. 3mm Prop Saver (2-Pack). motor shaft diameter: 3mm; pack: 2 pcs. Ships from NY, USA.
SG92R Analog Plastic Composite Gear Micro Servo, $8.00. US stock, ships fast from NY, USA. Towerpro SG92R Analog Plastic Composite Gear Micro Servo. Torque: 2.5 kg/cm at 4.8V; Speed: 0.1 sec/60deg at 4.8V; Gears: plastic composite.
MG90D Digital Metal Gear Micro Servo, $14.00. US stock, ships fast from NY, USA. Towerpro MG90D Digital Metal Gear Micro Servo. Weight: 13g; Gears: metal; Digital: True.
Z-Style Pushrods 1.2mm x 180mm with Adjustable Stoppers, 20-Piece, $10.99. HobbyPark 1.2mm x 180mm Z-style steel pushrods with 1.3mm adjustable stoppers. 20-piece linkage kit for RC planes and boats. Ships from NY, USA.
RC Airplane Control Horns, Clevises and Z-Pushrods Set, $9.17. RC airplane control horns, clevises, and Z-pushrods set. 5 control horns, 5 clevises, 5 linkage stoppers, 5 steel Z-pushrods, 20 pieces total. Ships from NY, USA.
DIY Landing Gear Tail Wheel Assembly for Small Airplanes (30mm Wheel), $4.99. DIY Landing Gear Tail Wheel Assembly for Small Airplanes (30mm Wheel). wheel diameter: 30mm; material: aluminum (per URL slug). Ships from NY, USA.
Metal Wheel Collars for RC Landing Gear, 10 Pieces, $5.99. 10-pack metal wheel lock collars for landing gear and axles. Ships from NY, USA.
Servo Arms, Extensions and Testers
Related buying guides on Quality RC Parts
RC Airplane Pushrods and Control Horns in the USA
Prop Adapters and Spinners for RC Airplanes in the USA
Browse all the guides on the Quality RC Parts Drone Guides hub, or start at the Quality RC Parts store.
Sources
- Wikipedia: Brushless DC electric motor (KV definition)
- Wikipedia: Propeller (diameter and pitch)
- HobbyWing: ESC and motor product documentation
Quality RC Parts stocks parts in New York, USA and ships in-stock orders in 1-2 business days.
Last updated: 2026-11-10.