Sirs,Does anyone know why a jet airliner is more likely to accumulate engine ice than airframe ice? Thanks,Paul(Don't know if this is the right place to post)?

Hangar chat is where this thread would go if it's not MSFS related, but relates to aviation.I'd guess that jet engines suck in air at great speed with those spinning fans--the faster air travels, the colder it is on objects. The air traveling through the intakes is being sucked in at a greater speed than the surrounding air, so I think ice would be more likely to form in the engine..-John

Hi Paul,It's the pressure drop in the inlet that condenses the moisture and will cause inlet icing before airframe icing.Cheers,JohnBoeing 727/737 & Lockheed C-130/L-100 Mechanichttp://www.precisionmanuals.com/images/forum/ng_driver.jpg

Ice tends to accrete on corners, the sharper the corner, the more the accretion. I guess the edge of the nacelle is a fairly sharp corner encouraging buildup.Also, Jet Airliners are less susceptible to airframe ice because the speeds the operate at causes some heating due to skin friction. That said, I don`t know why this shouldn`t heat the nacelle too? CheersLungs

I can verify that this concise answer coming from a fellow "oil rag" is the correct answer.

>That said, I don`t know why this shouldn`t heat the nacelle too? Your answer:>It's the pressure drop in the inlet that condenses the moisture and >will cause inlet icing before airframe icing.:)http://album.atomic-systems.com/showPic.ph...rbus_Advert.gif

Thanks!

I'm not aware that ice does neccissarily collect on engine inlets more then other leading edges or areas of much lower pressure like the upper wing. Lungs is correct that sharp edges tend to get more ice, this is becuase there is less of a bow wave in front the egde pushing the moisture outward, but this effectis marginal.Airliners tend to get less icing simply because of the height they cruise at. For efficiency they will cruise at heights with tempratures of around -50. Icing is worst between 0 and -10 which equates to approximately the 8000 to 12000' region in an ISA atmosphere. Then it is worst in colulonimbus clouds. There is virtually zero airframe icing below -25.Clear ice is the dangerous one. Moiture is supercooled and not forzen, it is the impact with the aircraft that causes the water to freeze. If the droplets are large, only a portion of the water freezes, the remainder runs back along the wing and freezes there. This tends to form in cumuluform clouds.Rime ice just forms a crusty fragile layer of aerated non solid ice at the leading edge.This is no where near as significant at clear. This tends to forum in stratiform clouds.The ram rise effect that Lungs referred to is called Total Air Temprature (TAT) and can be calculated thus:TAT = SAT * (TAS/100)^2 where SAT = Static Air Temprature also called Outside Air Temprature (OAT).