drgondog
Major
Intersting report - not specifically tagged to the 109 but in comparing 51 to fw 190D and Spitfire on Drag.
The total drag coefficients predicted by Lednicer's model is in very close agreement (and the same between the P51B and D) with wind tunnel tests.
This seems true despite the fact that the P-51D has a greater 'wetted area' than the P-51B. The 190D is closest to 51 in total wetted Drag but I haven't found an equivalent study on the 109.
The primary reason for better Bubble vs Birdcage or malcolm/blown hood' seems to be 1.) the better flow characteristics over the bubble top than the Bird cage canopy
This discussion and model would yield a nice comparison to the contrast between the 109 and the 51, particularly in predicting rate of energy loss in a manuevering fight.
Make your own judgements.
I like the model and the assumptions they made to set it up and the explanations for the variances. The 'singularities' used to simulate the finite element distribution of flow are source/sink pairs to create the 'circulation' and then they have to do iterations to introduce boundary layer growth to point of 'positive' pressure creating separation (and 'no lift') and resultant profile drag.
The total drag coefficients predicted by Lednicer's model is in very close agreement (and the same between the P51B and D) with wind tunnel tests.
This seems true despite the fact that the P-51D has a greater 'wetted area' than the P-51B. The 190D is closest to 51 in total wetted Drag but I haven't found an equivalent study on the 109.
The primary reason for better Bubble vs Birdcage or malcolm/blown hood' seems to be 1.) the better flow characteristics over the bubble top than the Bird cage canopy
This discussion and model would yield a nice comparison to the contrast between the 109 and the 51, particularly in predicting rate of energy loss in a manuevering fight.
Make your own judgements.
I like the model and the assumptions they made to set it up and the explanations for the variances. The 'singularities' used to simulate the finite element distribution of flow are source/sink pairs to create the 'circulation' and then they have to do iterations to introduce boundary layer growth to point of 'positive' pressure creating separation (and 'no lift') and resultant profile drag.