Westminster Abbey Arrow Spessifications

Some of the detail is left to the discretion of the archer, like the shaft wood and the fletching height/cut as these are unknown at present.
With the Westminster Abbey Arrow as a guiding model, the specifications are as follows: -

Shaft:
A straight or bob-tailed shaft must be a minimum of 3/8" (or 10mm) at the shoulder of the arrowhead and midpoint of the shaft. It must be constructed of a wood available to the medieval Welsh fletcher (aspen/poplar or birch is suggested) and be fitted with a horn (for preference) reinforcement at the nock running with the grain. The length from the base of the nock to the arrowhead socket must be 28 7/8" (as the Westminster Abbey Arrow).

Fletchings:
The cut of the feather fletchings are left to the archer’s discretion but must be at least 7 1/4” in length and bound on in silk or linen to a minimum of 4 turns per inch (either wound clockwise or anti-clockwise). A low triangle cut is the most likely fletching shape, based on contemporary images; however a hog-back or oil-line cut may also have been possible. Ascham was not convinced of its suitability for war arrows as writes, “ The swine backed fashion maketh the shaft deader for it gathereth more air”. A low fletching area is necessary to reduce drag for effective long range shots. Distance shooting arrows do not need a large fletching action to quickly straighten up unlike point blank shots. Goose, peacock or swan feathers are encouraged

Head:
Any small barbed hand-forged steel/iron type 16 head is acceptable, no less than 3/8" at the base of the socket.
NB Hector Cole makes a specific Westminster Abbey Arrow reproduction

There is no minimum weight as the above specification will ensure an effective long-range missle