Tail surfaces - 109F versus 109E?

[Graham Boak]

My query was on Pstrany's post, rather than George's, for he specifically wrote "builders drawings". Whether Messerschmitt or German manufacturers in general, he shall have to tell us (and every English grammar teacher will be crowing "Apostrophes do matter!")

(Little joke - I don't really expect all contributors to have perfect English.)

George is almost certainly wrong, in one sense, because it will not have been the RAF but the RAE (Royal Aircraft Establishment) who took so much effort to measure and compare the shapes. At least, it will have been done at their instigation, whoever took the measurements. I assumed George meant simply "the British".