Close this search box.

2020 Stewart S-51 Mustang // Impeccable Replica // N1944K

Auction Start: July 17, 2024
Auction End: July 24, 2024 12:00 pm

S-51 Details







Auction Start Date:
July 17, 2024
Auction Start Date:


Serial No:





Amateur Built



Description: This stunning ¾ scale replica brings any pilot into the thrill of the dogfight with safety and ease. A modern airframe makes this capable and challenging design a thrill to own and fly. With only 14 hours on the tach, this plane is essentially new. An immense amount of time and commitment went into making this incredible P-51 replica. Meticulous care was committed to every aspect of the build. From choosing and redesigning the engine or having special casts made of the cylinder heads, every single detail of this aircraft was poured over, making it the unique and beautiful bird it is today.
Airframe Details
  • 2020 Stewart S-51 Mustang
  • N1944K
  • S/N: 156
  • Aircraft Total Time: 14 hours
  • Date of annual: Freshly yearly inspection will be provided.
  • Fuel Capacity: 102 gallons
  • Stall Speed: 73
  • Range : 700 miles
  • Cruise: 230 @ about 23 gallons per hour
Engine Details
  • Keith Black Performance 540 Cubic Inch Chevrolet Engine
  • Engine Total Time: 14 SNEW
  • S/N: 003
Propeller Details
  • Hartzell 4 blade
  • Model: HCB4TN3-1 
  • HUB Model: Experimental
Avionics Details
  • Apollo SL60 GPS/COMM
  • Terra TRT 250D Transponder
  • TN 200D Nav Receiver
  • Fuel Gauge
  • Ammeter
  • Fuel Pressure Gauge
  • Manifold Pressure Gauge
  • Air Speed Indicator
  • Altimeter
  • Coolant Pressure Gauge
  • Oxygen Flow Indicator
  • Hydraulic Pressure Gauge
  • Oil Temperature Gauge
  • Coolant Temperature Gauge
  • Oil Pressure Gauge
  • Vertical Speed Indicator
  • Attitude Indicator
  • Turn Coordinator
  • Heading Indicator
Additional Features
  • Custom water pump that pumps 70 gallons per minutes
  • AirFlow Performance FM300 mechanical fuel injection unit
The exterior stays true to the vintage paint scheme of the original P-51. The gray body with, black, white, yellow, and green accents give the aircraft the eye-catching attention it deserves. With the build being recent, the exterior couldn’t be any more perfect.
The interior of this aircraft is impeccably clean, in an appealing shade of military green. The panel is sharp looking with the black instruments making a nice contrast. The brown leather seat makes flight comfortable, while the green 5 point harness keeps the pilot and passenger safely in their seats for the thrilling adventure.
Auction Details
Contact Phone: 254-735-5030
Contact Email:
Registration Number: N1944K
Make: Stewart
Model: S-51
Required Deposit: $5,000
Buyers Premium: 4%
Start Date: July 17, 2024
End Date: July 24, 2024 12:00 pm
Show more
Show less
Play Video

The 2020 Stewart S-51 Mustang: A Remarkable Low Hours & Aerobatic Replica

The 2020 Stewart S-51 Mustang is an exquisite example of a low hours and aerobatic replica, embodying a perfect blend of historical reverence, modern engineering, and exceptional performance. This article delves into the history of the Stewart S-51 Mustang, its unique features, and its standing as an exceptional low hours, aerobatic aircraft, this bird is practically new. Owning one of these machines is only for the thrill seeking military aviation buff, learn how you can buy this incredible one of a kind machine during Airventure.

Historical Background

The Legacy of the North American P-51 Mustang

The North American P-51 Mustang is one of the most iconic fighter aircraft of World War II. Renowned for its speed, agility, and range, the P-51 played a crucial role in securing air superiority for the Allies. Jim Stewart’s vision to create a ¾ scale replica of this legendary aircraft was driven by a desire to provide enthusiasts with a more accessible and manageable version of the P-51, while retaining its distinctive performance characteristics and aesthetic appeal.

The Genesis of the Stewart S-51 Mustang

Jim Stewart’s journey to create the S-51 Mustang began in the late 1970s. With a focus on achieving a 70% scale of the original P-51, Stewart aimed to strike a balance between cockpit comfort and the iconic design elements of the original Mustang. A significant challenge was sourcing an appropriate engine that could deliver the necessary horsepower within the constraints of a smaller airframe. The Chevrolet Big Block V8 engine emerged as the ideal candidate, providing the required power and reliability.

Evolution and Refinement

Over the years, the design and engineering of the Stewart S-51 Mustang underwent continuous refinement. Key elements, such as the propeller speed reduction unit (PSRU) and the cooling system, were meticulously designed to optimize performance and reliability. The result is an aircraft that not only pays homage to the original P-51 but also incorporates modern technological advancements to enhance safety and efficiency.

The 2020 Stewart S-51 Mustang: An Overview


The 2020 Stewart S-51 Mustang, with registration number N1944K and serial number 156, boasts a meticulously crafted airframe that mirrors the design of the original P-51. With a total aircraft time of just 14 hours, this Mustang is essentially new, offering an unparalleled flying experience. The airframe’s modern construction ensures both durability and performance, making it a standout in the realm of amateur-built experimental aircraft.

  • Total Time: 14 hours
  • Fuel Capacity: 102 gallons
  • Stall Speed: 73 knots
  • Range: 700 miles
  • Cruise Speed: 230 knots at approximately 23 gallons per hour


At the heart of the S-51 Mustang is a Keith Black Performance 540 Cubic Inch Chevrolet Engine. This powerhouse is designed to deliver robust performance, echoing the raw power of the original P-51 while incorporating modern enhancements for reliability and efficiency.

  • Engine Total Time: 14 hours since new (SNEW)
  • Serial Number: 003


The aircraft features a Hartzell 4-blade propeller, model HCB4TN3-1, specifically designed for experimental use. This propeller ensures optimal thrust and performance, contributing to the aircraft’s impressive aerobatic capabilities.

  • Model: HCB4TN3-1
  • Hub Model: Experimental


The 2020 Stewart S-51 Mustang is equipped with a state-of-the-art avionics suite that combines functionality and precision, ensuring a safe and efficient flight experience. The Apollo SL60 GPS/COMM system provides accurate navigation and reliable communication, essential for both casual flying and aerobatic performances. Complementing this, the Terra TRT 250D Transponder and TN 200D Nav Receiver enhance the aircraft’s navigational capabilities, ensuring seamless operation in various airspace environments. The avionics suite also includes a comprehensive set of gauges and indicators, such as the airspeed indicator, altimeter, manifold pressure gauge, and vertical speed indicator, providing the pilot with critical flight data at a glance. These features, combined with the attitude indicator, turn coordinator, and heading indicator, ensure that the S-51 Mustang is well-equipped for both VFR and IFR operations, making it a versatile and dependable aircraft for any


The exterior of the S-51 Mustang stays true to the vintage paint scheme of the original P-51. The gray body, accented with black, white, yellow, and green, ensures the aircraft stands out while paying homage to its historical predecessor. The recent build ensures the exterior is in pristine condition, ready to capture the attention of any aviation enthusiast.


Inside, the S-51 Mustang features an impeccably clean and appealing military green interior. The panel is sharp, with black instruments providing a striking contrast. A brown leather seat offers comfort, while a green 5-point harness keeps the pilot and passenger securely in place during thrilling aerobatic maneuvers.

Additional Features

The Stewart S-51 Mustang comes with several additional features that significantly enhance its performance and reliability. A custom water pump capable of pumping 70 gallons per minute ensures efficient cooling, crucial for maintaining optimal engine performance during extended flights and aerobatic maneuvers. The aircraft is also equipped with an AirFlow Performance FM300 mechanical fuel injection unit, which delivers precise fuel management, contributing to the engine’s efficiency and responsiveness. These additional features, combined with the aircraft’s robust construction and modern design, make the S-51 Mustang not only a tribute to the original P-51 but also a high-performance aircraft in its own right. These enhancements ensure that the Mustang can handle the rigors of both everyday flying and the demanding conditions of aerobatic flight, offering an unparalleled flying experience.

Auction Details

The upcoming auction of the 2020 Stewart S-51 Mustang presents a rare and exciting opportunity for aviation enthusiasts and collectors to acquire a meticulously crafted, low-hours replica of the iconic P-51 Mustang. Scheduled to take place from July 17 to July 24, 2024, this auction will allow bidders to vie for this exceptional aircraft, which boasts only 14 hours of total flight time. The starting bid is set at $275,000, reflecting the aircraft’s pristine condition and advanced features. A buyer’s premium of 4% will be applied to the final bid price, and a deposit of $5,000 is required to participate in the bidding process. This auction not only offers the chance to own a piece of aviation history but also to acquire a high-performance aircraft that delivers an extraordinary flying experience. Whether for personal use, airshows, or as a standout addition to a private collection, the S-51 Mustang is sure to captivate and inspire its new owner.

Why Bid on the S-51 Mustang?

Low Hours

With only 14 hours of total time, this aircraft is essentially new. The minimal usage ensures that the aircraft remains in pristine condition, offering potential buyers a unique opportunity to own a virtually new aircraft at a fraction of the cost of a new build.

Aerobatic Capabilities

The S-51 Mustang is designed with aerobatic performance in mind. The powerful Keith Black Performance engine, combined with the Hartzell 4-blade propeller, provides the thrust and agility required for advanced aerobatic maneuvers. This makes the S-51 Mustang not just a showpiece, but a high-performance aircraft capable of delivering thrilling flight experiences.

Historical Replica

This aircraft is a faithful ¾ scale replica of the legendary North American P-51 Mustang. It embodies the spirit and design of the original while incorporating modern advancements to enhance performance and reliability. Owning this aircraft allows enthusiasts to connect with aviation history in a tangible and exciting way.


The 2020 Stewart S-51 Mustang, with its low hours and aerobatic capabilities, is a remarkable aircraft that combines historical reverence with modern engineering. Its upcoming auction presents a unique opportunity for aviation enthusiasts to own a meticulously crafted, high-performance replica of the iconic P-51 Mustang. With its powerful engine, advanced avionics, and stunning design, the S-51 Mustang stands as a testament to Jim Stewart’s vision and dedication to aviation excellence. Whether for everyday flying or thrilling aerobatic maneuvers, this aircraft promises an unparalleled experience, making it a prized addition to any collection.

Leave a Reply

Your email address will not be published. Required fields are marked *

Sharing is caring


1940 Piper J3 Cub // Hand Prop // N31178

1975 Piper 235 Pathfinder // Cross Country Dream // ZS-JHV

AirVenture Oshkosh: GO/NO GO

1979 Cessna 172N // Great Trainer // N4854G

A Guide to Researching and Vetting an Aircraft for Purchase

1972 Cessna T337G // Excellent Condition // N19SB

1968 Cessna 310P // Extremely well cared for // N5768M

1970 Cessna 177B Cardinal // N177VC

Finding Value: Assessing an Aircraft Purchase

1940 Stearman PT17 // Excellent Condition // N52561

2007 Robinson Helicopters R44 // Fresh 12 year Refurb // N29KY

2020 Stewart S-51 Mustang // Impeccable Replica // N1944K

1986 Yak 52 // Affordable Acrobatic Warbird // N211YA

Finding the Perfect Plane: Defining Your Specs and Making Smart Choices

1959 Cessna 150 // New Interior // N5662E

Mission Driven Decisions

The Art and Science of Restoring Classic Aircraft: A Labor of Love

Aviation Memorabilia Auction at Airventure: No Sellers Fees for AirSpace Clients

1977 Cessna 337G // Aspen Evolution 2500 Glass Panel // N53704

Why Bother with So Much Data and Advertising?

2007 Cessna 172S // G1000 // N1688L

1967 Cessna R172E // US Army T41B // N98189

1956 Beechcraft Bonanza H35 // Incredibly Clean // N4686D

Warbirds: Capturing the Essence of Vintage Military Aviation

Aging Aviators: Navigating the Skies of Insurance

1960 Comanche 180 // Impeccible Maintenance // N7065P

2015 Titan T-51 Mustang // Honda Powerplant // N6045

Sun N Fun Raises Lots of Questions

Good Logs Account for Good Value

1956 Beechcraft Bonanza G35 // Classic with Excellent Condition Interior // N463BB

1949 Boeing YL-15 Scout // Airventure Grand Champion // N4770C

1959 Dornier DO27 // Flown By Neil Armstrong // D-EDFL

Welcome to Paradise: Flying Oaks Airport

2006 Diamond DA40 // The Perfect Trainer // N420FP

1967 Cessna 172H // Excellent Time Builder // N1761F

1970 Cessna 310 // Fresh Annual Upgraded Avionics // N7702Q

WAI – Jimmy’s World – Sun ‘N Fun – Aeroverse 

1999 Lancair 360 // Best Built 360 out there // N8261E

1956 Cessna 310 // Save the 310 // N310EB

Flight Plan to Aeroverse and Sun N Fun Turns 50

1970 Cherokee PA-28-140 // Fresh Annual //N1736T

Soaring Heights: Women Shaping Aviation and Business

The Most Fun You Can Have on a Computer While at Work

Title Searches: Securing your asset in an aircraft transaction

1969 Aero Commander Shrike 500S // N532SA

1978 Rockwell Aerocommander 112TCA // N4695W

When Is Traffic a Good Thing?

1941 Naval Aircraft N3N-3 // Well Kept Warbird // N51H

1970 Cessna 150 Aerobat // Fresh Paint STOL // N5900J

2006 Flight Designs GMBH CTSW // Long Range & Fuel Efficient // N135CT

Aircraft Auction

1975 Piper 235 Pathfinder // Cross Country Dream // ZS-JHV

Experience the ultimate in versatility with the Piper P235 Pathfinder, an ideal choice for flight training, personal travel, or light commercial operations. With impressive speed, range, and payload capacity, it’s perfect for long cross-country flights. The comfortable seats ensure a relaxed and enjoyable flying experience, whether you’re flying for pleasure, training, or business. The Piper P235 Pathfinder delivers unmatched performance and comfort, making it the perfect companion for all your aviation needs.

Read More »

AirVenture Oshkosh: GO/NO GO

For pilots, aviation enthusiasts, and aircraft buyers and sellers, AirVenture Oshkosh is the pinnacle of aviation events. Often dubbed “the biggest airplane party in the world” and “the biggest pilot family reunion,” this event draws an impressive 650,000 aviation aficionados to Wisconsin each year. But is it really worth the trek? Absolutely.

Read More »
Aircraft Auction

1979 Cessna 172N // Great Trainer // N4854G

N4854G is a 1979 Cessna 172N that has spent most of its life in a commercial operation with 100 hour inspections. It was well cared for and documented. This aircraft will make a great addition to any flight school or be a reliable and affordable time builder.

Read More »

A Guide to Researching and Vetting an Aircraft for Purchase

Welcome to section 4 of our 7-part Buyer’s Guide to Successful Aircraft Purchases series! In this installment, we’re diving into the details of vetting an aircraft before purchase. After you’ve defined your mission, budget, and market value, it’s time to buckle up and get into the nitty-gritty—reviewing logbooks, arranging pre-purchase inspections, and more. This guide is tailored for first-time buyers and newer pilots, so grab your clipboard and let’s get started!

Read More »
Aircraft Auction

1972 Cessna T337G // Excellent Condition // N19SB

N19SB is a 1972 Cessna Skymaster T337G. The aircraft is in excellent condition inside and out. It will be sold with a fresh annual. Fly with the added safety of twin engines in a unique inline configuration. Enjoy the ability to fly in the flight levels over weather with the comfort of pressurization.

Read More »

Sell Your Aircraft Quickly
// Plane Easy //

complete this form to download your free guide to selling your aircraft.

Complete this form to buy or sell.
// Plane Easy //

Maintain Contact