# C400 TTX > Aircraft mass, balance, and performance calculator for Cessna 400 and TTX. (iPhone/iPad app by Gyronimo, LLC.) - Source: https://appshunter.io/ios/app/c400-ttx/id968463979 (this page in markdown: same URL + `.md`) - Developer: [Gyronimo, LLC](https://appshunter.io/developer/536898885) - Category: Entertainment - Price: $18.99 - Rating: 5.00/5 from 1 App Store ratings - Age rating: 4+ - Requires: iOS 16.6 · 24 MB - Languages: English - Released: 2015-02-25 - Data updated: 2026-07-28 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/c400-ttx/id968463979/reviews.md ## What is C400 TTX? Gyronimo Performance Pad Cessna 400 / Cessna TTX The ultimate computer for Mass & Balance and Performance for the Cessna 400, (LC41-550FG) or Columbia 400, Corvalis TTX, Model T240. with Continental Motors TSIO-550-C Engine, 310 HP @ 2600 RPM *** Now with Lean-Of-Peak computations and TKS-Fluid option. **** PROFESSIONAL LOAD MANIFEST ***** Sign the manifest on the iPad and send it via email or print via AirPrint. Calculate and interpolate performance data using the actual values from the Pilot's Operating Handbook (POH). Finish your complete fight planning in just a few seconds. Performance planning has never been easier and quicker. Results are updated immediately and displayed in high resolution graphics, enhanced for the iPad 2/3 and iPad Mini. Change all important values using sliders. Experiment with the results and create "what if" scenarios in no time. Find your optimal cruise altitude, takeoff ground roll, landing distance, climb data and stall speeds. The Performance Pad has seven main pages: 1. The Mass & Balance (or Weight & Balance) Page Calculates Center of Gravity, Moments, Takeoff and Zero Fuel Mass. Set person and baggage weights in seconds using the convenient sliders. Check if the CG is within limits using three graphical displays - Moment Envelope - CG envelope - Aircraft axis 2. The Takeoff Page Using the actual data from the Operating Handbook the Performance Pad calculates and displays Ground Roll and Landing Distance based on: - Aircraft Mass - Takeoff Elevation in MSL (Pressure Altitude and Density Altitude will be computed) - Outside Air Temperature (OAT) - Altimeter Setting - Runway Conditions (i.e. paved dry to long grass or snow) - Runway Slope - Wind Conditions Wind Components Computer - Use the Wind Components page to determine your headwind or tailwind component. Rotate the wind dial to set wind direction, set windspeed and the results will be transferred to your takeoff computations automatically! 3. The Climb page Calculates time, fuel and distance based on - Difference between Takeoff Elevation and intended Flight Level - Altimeter Setting - Outside Air Temperature (OAT) - Altimeter Setting - Headwind or Tailwind Component Also the Rate of Climb and Climb Speed will be displayed. 4. The Cruise Page Using the actual data from the Pilot's Operating Handbook you can determine the optimal cruise altitude based on - Trip Distance - Flight Level - MAP / RPM - Temperature - Wind and Altimeter Setting 5. Landing Page Calculates Ground Roll and Landing Distance based on wind, elevation, altimeter setting etc. Like on the Takeoff Page you can use the Wind Components Computer to quickly determine head- or tailwind components 6. Stall Speed Page. Calculates The Stall Speed based on Bank Angle and Flap Settings. Stall Speed will be computed as KIAS and KCAS using the actual values from the POH. 7. Setup - Load and Save up to five Aircraft Settings and Scenarios. - Send a Mass & Balance Summary to your email address. - Visit our video channel and watch tutorials and video manuals. Mode Switch: The Performance Pad can be used in two Modes: "Individual Mode" All calculations can be done independently from each other. "Plan Mode" Calculated values will be forwarded to the next page and an additional "Flight Summary Page" is available. Gyronimo LLC is not affiliated with the Cessna Aircraft Company. All Gyronimo Performance Pads for Cessna aircrafts are not sponsored or endorsed by Cessna Aircraft Company. Icon Image (c) Cessna The author disclaims any liability for any direct, indirect, incidental, or consequential losses or damages in connection with your access to or use of this software. The information contained in this software is for general information purposes only. ## Key features - Mass & Balance calculations - Takeoff and Landing distance computation - Cruise performance optimization - Stall speed determination - Wind component calculation - Load manifest signing and emailing - Customizable aircraft settings ## Frequently asked questions about C400 TTX ### What aircraft models does C400 TTX support? C400 TTX supports the Cessna 400 (LC41-550FG), Columbia 400, Corvalis TTX, and Model T240, specifically with the Continental Motors TSIO-550-C Engine. ### Can C400 TTX be used offline? The description does not explicitly state offline capabilities, but flight planning and performance calculations are typically performed without requiring a constant internet connection once the app is installed. ### How does C400 TTX calculate performance data? It calculates performance data by interpolating actual values from the Pilot's Operating Handbook (POH) for factors like aircraft mass, elevation, temperature, and runway conditions. ### What is the price of C400 TTX? C400 TTX is a paid application priced at $18.99. ### How often is C400 TTX updated? The latest version is 1.7, and it was last updated on September 29, 2025, indicating regular updates to maintain functionality and incorporate new features. ### Does C400 TTX have ads? The application is a paid product and does not mention advertisements in its description, suggesting it is ad-free. ### What are the main features of C400 TTX? Key features include detailed Mass & Balance calculations, takeoff and landing distance computations, cruise performance optimization, stall speed determination, and a load manifest signing feature. ### What is the age rating for C400 TTX? C400 TTX has an age rating of 4+, making it suitable for a wide range of users. ## Version history (last 1 release) ### 1.7 — 2025-09-29 General bug fixes, update to latest iOS version. ## More apps by Gyronimo, LLC - [R44 Raven II](https://appshunter.io/ios/app/r44-raven-ii/id536898882) - [R44 Raven](https://appshunter.io/ios/app/r44-raven/id549114077) - [R22](https://appshunter.io/ios/app/r22/id552373715) - [R44 Pad XS](https://appshunter.io/ios/app/r44-pad-xs/id561929569) - [C172S Pad](https://appshunter.io/ios/app/c172s-pad/id574791356) - [E6B Pro Pad](https://appshunter.io/ios/app/e6b-pro-pad/id586546393) All apps by Gyronimo, LLC: https://appshunter.io/developer/536898885 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-28.*