ANN's Daily Aero-Tips (11.11.06): Hot Start | Aero-News Network
Aero-News Network
RSS icon RSS feed
podcast icon MP3 podcast
Subscribe Aero-News e-mail Newsletter Subscribe

Airborne Unlimited -- Recent Daily Episodes

Episode Date

Airborne Unlimited-
Monday

Airborne-Unmanned w/AUVSI-
Tuesday

Airborne Unlimited-
Wednesday

AMA Drone Report-
Thursday

Airborne Unlimited-
Friday

Airborne On ANN

Airborne 02.19.18

Airborne-UnManned 02.20.18

Airborne 02.14.18

AMA Drone Report 02.15.18

Airborne 02.16.18

Airborne-YouTube

Airborne 02.19.18

Airborne-UnManned 02.20.18

Airborne 02.14.18

AMA Drone Report 02.15.18

Airborne 02.16.18

Sat, Nov 11, 2006

ANN's Daily Aero-Tips (11.11.06): Hot Start

Aero-Tips!

A good pilot is always learning -- how many times have you heard this old standard throughout your flying career? There is no truer statement in all of flying (well, with the possible exception of "there are no old, bold pilots.")

Aero-News has called upon the expertise of Thomas P. Turner, master CFI and all-around-good-guy, to bring our readers -- and us -- daily tips to improve our skills as aviators. Some of them, you may have heard before... but for each of us, there will also be something we might never have considered before, or something that didn't "stick" the way it should have the first time we memorized it for the practical test.

Look for our daily Aero-Tips segments, coming each day to you through the Aero-News Network.

Aero-Tips 11.11.06

More and more airplanes in the general aviation fleet have fuel injected engines. One of the lessons pilots need to learn about starting fuel injected engines is how to start them when they are hot -- how to prevail in the dreaded "hot start".

Note: a "hot start" in turbine engines is a completely different situation, with a far more critical outcome. Today's we'll stick to our fuel-injected piston topic.

Why hot starts are an issue

Fuel injected engines depend on liquid fuel in the lines all the way to fuel injector nozzles, which combine air and fuel just before it enters the cylinders for combustion. Any vapor in the fuel lines interrupts flow, and may form a "vapor lock" that prevents fuel delivery altogether. Fuel vapor results from undissipated heat, usually in an engine-driven fuel pump but sometimes elsewhere in the fuel injection system.

Hot start

The procedure to perform a hot start differs based on the engine/airframe combination and, significantly, the type of fuel injection system involved, but all hot start procedures have one thing in common: replacing fuel vapor with liquid fuel. This can be accomplished in several ways:

  • Running a boost pump while the mixture control is in the idle cutoff position.
  • Attempting start with the mixture in idle cutoff, and advancing the mixture when the engine fires (note; this is the normal start procedure in some fuel-injected engines).
  • Purposely flooding the engine (by running the a boost pump with the mixture set to rich), then performing the Flooded Start procedure.
  • Performing the normal start with the throttle set more open than normal, hoping the engine-driven fuel pump pushes vapor out of the lines.

Put 20 pilots in a room and you'll probably come up with about 18 different ways to hot-start a fuel injected engine. Any may work on any given day, but generally there's one technique that works best for a specific engine/airframe combination. Some options (like intentionally flooding) may result in a damaging backfire or, in extreme cases, an engine-warping liquid lock in the cylinders.

Aero-tip of the day: Ask engine experts (user groups, manufacturers, etc.) to learn a safe, dependable way to hot start the fuel injected engines you fly.

FMI: Aero-Tips

Advertisement

More News

Airborne 02.19.18: TruTrak Vizion Approvals, 737 MAX 9 Cert, Airplane Loan Scam

Also: Frasca Celebrates 60 Years, Klyde’s 40th!, European Plan For AvSafety, Texas Aviation Hall Of Fame The STC for the TruTrak Vizion autopilot has been updated to include >[...]

Airborne-Unmanned 02.13.18: FAA UAS Symposium, Airbus Delivers, Manned EHANG 184

Also: UAS Pilot Code, FAA Drone Program, SkyWatch Funding, Quantix Hybrid UAS For Farmers The FAA and AUVSI will co-host the 3rd Annual FAA Unmanned Aircraft Systems (UAS) Symposiu>[...]

AMA Drone Report 02.15.18: AMA Expo East, Skydio R1, TSB Canada Report

Also: DJI Knowledge Quiz, GoFly Competition, Drone ID Rules Coming, FAA Unenthusiastic About Prosecuting? The Academy of Model Aeronautics will host the annual AMA Expo East at the>[...]

Airborne 02.19.18: TruTrak Vizion Approvals, 737 MAX 9 Cert, Airplane Loan Scam

Also: Frasca Celebrates 60 Years, Klyde’s 40th!, European Plan For AvSafety, Texas Aviation Hall Of Fame The STC for the TruTrak Vizion autopilot has been updated to include >[...]

Airborne-Unmanned 02.20.18: USMC InstantEye, Raleigh Reconsiders, Battle Drones

Also: Fortem DroneHunter, Solar-Powered Rover, Drone Mkt Worth $48.88B, MQ-25 Partnerships InstantEye Robotics has received a substantial order from PMA-263, the Navy and Marine Co>[...]

blog comments powered by Disqus



Advertisement

Advertisement

Podcasts

Advertisement

© 2007 - 2018 Web Development & Design by Pauli Systems, LC