Opssys - it seems that Victor Vermorel (vs Vermoral) was killed at the battle of Vercors on 23 July 1944, not flying, but wielding a machine gun. Wikipedia will tell you in general about Vercors without mentioning M. Vermorel, other sites do, and I found most by entering 'Victor Vermorel Aviateur' in Google.
A detailed account of the battle of Vercors (in French) is here:
www.beaucoudray.free.fr/vercors2.htm
There is also a plaque erected in his memory illustrated at
http://www.pagesperso-orange.fr/espa...lyon/drome.pdf
Mention is made of him too at
www.geo.anse.com/geo/aero115.htm
He was obviously a very well-known industrialist, viticulturist, inventor (spray can, etc), an accomplished pilot, but also deeply involved in the French Resistance.
At one time he owned, amongst others, Farman F.231 F-ALGY
I hope this helps.
Good Luck
Alan