Hello,
I was just navigating that I came across this page...
I built a few years ago the BT 64" Grumman Hellcat. The plan according to Mr. Taylor was drawn from direct measurements of the actual plane that is preserved at a museum in the city of Southampton in the United Kingdom. It has a fixed landing gear and no flaps. In regarding scale details the plan has plenty of information and the fiberglass cowl is of an F6F 5 Hellcat. Unitracts International in the UK sells air retracts for the model.
I think the airfoil is very close to the NACA 23015 in overall with the exception of the leading edge which I would say is more rounded. The wing also has washout of course. With the NACA 23015 and the NACA 23009 in the tips of the wing it would make an even more attractive wing but I think that the scale is too small ...
I have not flown mine yet and at present I am trying to put some detail on it. I will try to post some pictures...I am not the person in the picture...He is a mate from the Club.

Apologies for my English!

Regards,

Mario Franco.