Review Reports - Study of Paired Approach Wake Separation Based on Crosswinds

Round 1

Reviewer 1 Report

Comments and Suggestions for Authors

See the file attached.

Comments for author File: Comments.pdf

Comments on the Quality of English Language

Otherwise satisfactory. However, needs to be further improved.

Author Response

Thank you for your professional review. I have uploaded my responses and the revised manuscript for your review. If you have any further questions or areas for discussion, please do not hesitate to let me know. Your insights and feedback are highly.

Author Response File: Author Response.pdf

Reviewer 2 Report

Comments and Suggestions for Authors

The paper deals with a subject associated with comprehensive studies with respect to wake vortex analysis, characterization, control and detection.

The paper addresses a standard approach which is not novel in itself but the data base used is of interest and may contribute to the overall knowledge on wake vortex hazard classification.

It is recommended to tackle some minor points prior to publication:

1) Fig. 2: It should be indicated that the lateral vortex spacing of pi/4 is linked to an elliptical circulation/lift distribbution or loading, respectively.

2) All symbols and acronyms used should be explained throughout the main (!) text or a nomenclature should be included, e.g. B_l (wing span) is shown in Fig. 2 but not explicitely mentioned in the text. (E.g., in Eq. 12, B refers to the wing span.) "PA" is only explained in the abstract.

3) For the wake vortex related tangential velocity field representation (rolled-up stage) the Burnham-Hallock model is applied. It should be mentioned that this is one applicable model but other models are in use which may reflect the actual velocity field situation with more precision. The whole hazard analysis is based on the associated velocity distribution with respect to the induced velocity applied here to the "strip method".

4) Regarding the section conclusions all abbreviations/acronyms used there should be also explained (e.g. PA). Is the second post-comma digit at 2.02 m/s a meanigful value ?

5) References:

It is also suggested to include further references:

F. Holzäpfel and J. Kladetzke: Assessment of wake-vortex encounter probabilities for crosswind departure scenarios’, Journal of Aircraft, vol. 48, no. 3, pp. 812–822, 2011.

Wartha, N., Stephan, A., Holzäpfel, F. and Rotshteyn, G.: Characterizing aircraft wake vortex position and strength using LiDAR measurements processed with artificial neural networks. Optics Express, Vol. 30, No. 8, 2022, pp. 13197-13225.

C. Breitsamter: Wake vortex characteristics of transport aircraft, Progress in Aerospace Sciences, Vol. 47, Iss. 2, 2011, pp. 89-134.