NACA front cowling

[jacques]

I want to improuve my cowling on my Vixen serie 5 and I am going to use a Naca on the lower front like on the series 7.

Do you know the size of this NACA?

[enyaw]

Hope these help:
https://www.facebook.com/#%21/photo.php?fbid=10150260793486270&set=pu.132606786269&type=1&theater


https://www.facebook.com/#!/photo.php?fbid=10150260793486270&set=pu.132606786269&type=1&theater (https://www.facebook.com/#%21/photo.php?fbid=10150260793486270&set=pu.132606786269&type=1&theater)
https://www.facebook.com/photo.php?fbid=10150187940156270&set=pu.132606786269&type=1&theater


https://www.facebook.com/#%21/photo.php?fbid=10150260793486270&set=pu.132606786269&type=1&theater