Comparison

Engine LD vs Trans4motor S

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Engine LD

Features
Read full description

Engine Layout Definitions (Engine LD) Understand how piston–crank geometry impacts engine performance. • Explore how layout changes affect engine displacement, rated power, and dynamic forces. • View detailed graphs and data lists: • Displacement volume vs. crank angle • Dynamic forces vs. crank angle • Export values for spreadsheet analysis or basic FEA (finite element analysis). • Interactive simulation: adjust crank rotation with a slider to visualize dimension effects on engine packaging.

About

Trans4motor S

Explore the inner workings of various four-stroke aircraft engines through detailed CG animations. Experience realistic engine sounds, throttle control, and interactive modes like cutaway views and engine start-up simulations. Learn about engine mechanics and history.

Highlights
  • Transform between engine types
  • Realistic engine sound and throttle control
  • Cutaway view of engine internals
  • Virtual engine start-up procedure
  • Interactive movie presentations
  • Machine gun firing simulation
Features
Read full description

"Trans4motor S" is the reciprocating aircraft engine simulator. You can operate a wide range of four-stroke engines from the Wright brothers' inline 4 cylinders to the radial, inverted V, W, and H-type on your iPad/iPhone. Recommended to anyone interested in car and motorcycle engines. This is for those who have a relentless love for engines and want to enhance their knowledge. Relive the development of the glorious reciprocating aircraft engine. https://www.youtube.com/user/Trans4motor https://www.facebook.com/Trans4motor Features 1) Seamlessly transforms into different types of engines Select from Radial to V-type, or V-type to inverted V-type, etc., and watch the running engines transform over continuous CG animation. You can enjoy watching pistons, connecting rods, camshafts, valves, and many other parts rotate, separate, and combine to make a variety of engine forms. 2) Engine sound and throttle control. Developed in technical collaboration with Sound Design Lab, the developer of the innovative engine sound application "RealEngineSim", based on the SDL method of engine sound synthesis, this new feature brings a new level of engine sound synthesis for aircraft. You can experience realistic and powerful engine sounds include, of course, the different numbers of cylinders, the difference between air-cooled and liquid-cooled engines, and the interference sound caused by the rotation of propellers. In addition, a sophisticated aircraft engine physics model is available in this new version. It calculates the engine speed based on the engine torque and rotational resistance due to the air resistance depending on the diameter and number of propellers in real time. Please try the realistic throttle operation. 3) Cutaway mode You can view the inside of the air-cooling fins and crankcase of the running engine by cutting them horizontally and vertically in real-time. 4) Engine start-up mode Turn the starter handle manually, increase the speed of the inertia starter and contact the clutch! In this mode, you can virtually experience the engine start-up procedure. 5) Machine gun mode In this mode, you can test-fire the "Type 97 aircraft machine gun" of the "Sakae" engine installed in the Zero fighter, the "MG 151/20" of the "DB 601" engine installed in the "Messerschmitt Bf 109". You can also learn how the propeller synchronize system works in super slow motion. 6) Interactive Movie ·Four-stroke engines ·Cam and Gear ·Gun ·Sleeve Valve Recorded 4 controllable presentation videos. Additional functions planned in the future. ·R-4360 Wasp Major will be available soon. ·Adding function to import 360° background images (HDRI files). The CG animated engine rotates at one tenth of the actual speed to enable users to learn the structure and to enjoy the visual. This application is based on a representation of the engine specifications available to the public for learning purposes, and is not a precise rendition of the dimensions and design of the actual machine. The company and product names used within the application are generally registered trademarks or trademarks of the respective companies.

Screenshots

Engine LD4 screens
Trans4motor S4 screens

Verdict

The call

The clearest difference is update cadence: Trans4motor S at weekly against Engine LD's every 5 months. Engine LD's advantage is price ($2.99 vs $5.99). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Engine LD costs $2.99 and Trans4motor S $5.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Engine LD ships an update every 5 months, Trans4motor S weekly. The most recent releases landed on October 9, 2026 and October 1, 2026 respectively.

Scorecard2 real differences · 8 level
Engine LD versus Trans4motor S: the parameters behind the verdict, then further details
ParameterEngine LDTrans4motor S
Price$2.99 — better$5.99
Rating—4.6 (19 ratings) — better
Positive reviews—50.0% of reviews
Number of ratings—19 — better
Update frequencyEvery 5 monthsWeekly — better
AdsNoNo
In-app purchasesNoNo
Monetization—Paid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13.0 — better14.1
Further details — not scored
Size10 MB127 MB
Age rating4+4+
DeveloperDRH YAZILIM VE MUHENDISLIK HIZMETLERI LTD STIKitt Peak, Inc.

In-app purchases

None

Engine LD

No in-app purchases

None

Trans4motor S

No in-app purchases

Questions

Is Engine LD free?
Engine LD costs $2.99, with no in-app purchases.
Is Trans4motor S free?
Trans4motor S costs $5.99, with no in-app purchases.
Do Engine LD or Trans4motor S have ads?
Neither Engine LD nor Trans4motor S shows ads.
Which is updated more often, Engine LD or Trans4motor S?
Engine LD ships an update every 5 months, and Trans4motor S weekly. Most recently, Engine LD was updated on October 9, 2026 and Trans4motor S on October 1, 2026.

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