Why would a petrol engine stall at an altitude?

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Discussion Overview

The discussion revolves around the reasons a petrol engine might stall at altitude, particularly in the context of a homemade aircraft. Participants explore various potential causes and considerations related to engine performance in flight, including fuel supply, air intake, and mechanical failures.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant describes an incident where a homemade aircraft's engine stalled at a certain altitude, prompting questions about the underlying causes.
  • Another participant suggests that improper switching between fuel tanks could lead to engine stalling due to insufficient fuel supply.
  • Concerns about lack of oxygen at high altitudes, potential blockages in the air intake, or fuel pump failures are raised as possible reasons for stalling.
  • A participant emphasizes that an engine requires fuel, air, oil, and ignition to operate, and any deficiency in these can result in stalling.
  • Mechanical failures, such as broken parts or cooling system issues, are noted as potential causes for engine shutdowns.
  • Specific scenarios, such as using the wrong type of fuel or experiencing icing in carbureted engines, are mentioned as factors that could lead to engine failure.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the specific cause of the engine stalling, as multiple potential explanations are presented, indicating a range of competing views and uncertainties.

Contextual Notes

Participants mention various assumptions regarding fuel supply methods (pumped vs. gravity fed) and the type of aircraft (manned vs. model/drone), which may influence the discussion but remain unresolved.

Kelly Andrew
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The engine was used to propel a small home made air craft. It worked very well while it taxied away and went airborne, then at a certain altitude it stopped abruptly then came crashing down. Why? And what simple engine design can sustain the air craft?
 
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It seems you're asking about why an engine would stall at a certain height, right?

My friend, who was a pilot of small aircraft told me that there are two gas tanks and a valve that you use to switch between tanks. Sometimes if the pilot isn't careful he/she may switch to the secondary tank but not switch it all the way. Consequently the engine stalls due to lack of gasoline.

Other reasons why an engine might stall is due to lack of oxygen either because something has lodged in the air intake or its flying too high or due to a fuel pump failure.
 
Is this manned or a model/drone? Is the fuel pumped or gravity fed?
 
There are many reasons that an airplane engine can stop running.

An engine needs fuel, air, oil, and ignition to run. Take away anyone of those, and the engine stops.

An engine consists of many mechanical parts. If the wrong part breaks, the engine stops.

An engine has a cooling system. If that system fails, the engine can stop. Think bird nest in an air cooled engine.

The engine is operated by the pilot. If the pilot does certain things wrong, the engine stops. Taking off with fuel selector on an empty fuel tank is a popular way for an engine to stop shortly after lifting off. A friend did that.

Wrong fuel. Jet fuel in a gasoline engine. Water in the fuel. I experienced a fuel line freeze up one night over the Black Hills of South Dakota. Fortunately, the fuel line from the other fuel tank was not frozen.

Icing in carbureted engines.
 

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