GazzaS Posted February 8, 2022 Share Posted February 8, 2022 We all know that most German planes had a big supercharger intake on the port side. But I don't see such things on P-51's and Spits. Where's the air coming in at? I know some planes had exhaust driven superchargers... But I don;t think the two planes mentioned do. 3 Link to comment Share on other sites More sharing options...
Artful69 Posted February 8, 2022 Share Posted February 8, 2022 Below ... 3 Link to comment Share on other sites More sharing options...
Artful69 Posted February 8, 2022 Share Posted February 8, 2022 19 hours ago, GazzaS said: We all know that most German planes had a big supercharger intake on the port side. But I don't see such things on P-51's and Spits. Where's the air coming in at? I know some planes had exhaust driven superchargers... But I don;t think the two planes mentioned do. Ok Gazza ... A minor correction ... Two types of "charging" the engine - otherwise known as forced induction ... Well, strictly speaking there is a third, but that pretty much falls under the umbrella of "naturally aspirated" - A ram scoop seen on the bonnet/hood of many high performance motor vehicles - since the engine is still sucking the air in, even though it is being forced by "ramming" the air into the intake by speed of the vehicle. Supercharging ... Mechanically driven impeller usually either by belts running directly off a crank pulley or gear driven off the crank. Turbocharging ... use of expelled exhaust gasses to drive an impeller which in turn drives a compressor - forcing air into the engine. The difference in application amounts to efficient transfer of energy - Supercharging is a more direct energy transfer - the more the engine revs the more the impeller spins - in direct ratio. With turbocharging there is always a "lag" factor ... you have to wait for exhaust gas pressure to spin up the impeller ... in a lot of ways its a cheaper method of forced induction - but not as efficient as supercharging. In some modern applications a combination of both is used - as with my previous car - a Ford Fiesta ST with an Ecoboost engine ... Down to business ... Here is a Merlin engine showing where the air intake is ... on the back of the engine drawing air from the bottom - underneath the cowl ... Here is a photo of the actual part attached to the superchargers impeller casing ... And finally here is the intake on the underside of the cowl ... Hope that all makes sense for you mate? Rog 4 Link to comment Share on other sites More sharing options...
Martinnfb Posted February 9, 2022 Share Posted February 9, 2022 Few more pics to top it up 1 Link to comment Share on other sites More sharing options...
GazzaS Posted February 9, 2022 Author Share Posted February 9, 2022 16 hours ago, Artful69 said: Ok Gazza ... A minor correction ... Two types of "charging" the engine - otherwise known as forced induction ... Well, strictly speaking there is a third, but that pretty much falls under the umbrella of "naturally aspirated" - A ram scoop seen on the bonnet/hood of many high performance motor vehicles - since the engine is still sucking the air in, even though it is being forced by "ramming" the air into the intake by speed of the vehicle. Supercharging ... Mechanically driven impeller usually either by belts running directly off a crank pulley or gear driven off the crank. Turbocharging ... use of expelled exhaust gasses to drive an impeller which in turn drives a compressor - forcing air into the engine. The difference in application amounts to efficient transfer of energy - Supercharging is a more direct energy transfer - the more the engine revs the more the impeller spins - in direct ratio. With turbocharging there is always a "lag" factor ... you have to wait for exhaust gas pressure to spin up the impeller ... in a lot of ways its a cheaper method of forced induction - but not as efficient as supercharging. In some modern applications a combination of both is used - as with my previous car - a Ford Fiesta ST with an Ecoboost engine ... Down to business ... Here is a Merlin engine showing where the air intake is ... on the back of the engine drawing air from the bottom - underneath the cowl ... Here is a photo of the actual part attached to the superchargers impeller casing ... And finally here is the intake on the underside of the cowl ... Hope that all makes sense for you mate? Rog That makes great sense to me Rog. Thank you very much. Link to comment Share on other sites More sharing options...
GazzaS Posted February 9, 2022 Author Share Posted February 9, 2022 3 hours ago, Martinnfb said: Few more pics to top it up Thank you, Martin. Now... does this mean that all other cooling is done by that big scoop under the belly? 1 Link to comment Share on other sites More sharing options...
Artful69 Posted February 9, 2022 Share Posted February 9, 2022 30 minutes ago, GazzaS said: Thank you, Martin. Now... does this mean that all other cooling is done by that big scoop under the belly? The big scoop under the belly was for radiator and oil cooler airflow … Meanwhile here’s another pic of the supercharger intake for the P-51 Rog 2 Link to comment Share on other sites More sharing options...
ScottsGT Posted February 9, 2022 Share Posted February 9, 2022 It was quite obvious on my old Z-28 I had back in the late '80's 1 4 Link to comment Share on other sites More sharing options...
Martinnfb Posted February 9, 2022 Share Posted February 9, 2022 Oh , that split bumper looks delicious 1 1 Link to comment Share on other sites More sharing options...
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