Please excuse the size of this post but I found a solid piece of information on the 81Cs
Autosport 11 Jun 1981 p5
Confirmed: A. J. Foyt, very dissatisified with his new Coyote at Indianapolis has definitely bought a March Indy car. He acquired Bill Whittington's car immediately after the 500, and it left the Speedway in AJ's transporter.
So I grabbed the 1981 Hungness off the shelf:
Bill Whittington's #90 is photographed on p117 and was plain yellow with black numbering.
Don Whittington's #91 is photographed on p127 and was plain red with white numering.
Bill Whittington's #94 (which he failed to qualify) is photographed on p93 but only in black and white. It has black numbering and could, maybe , be yellow.
So did Foyt buy the #90 or the #94?
The next time one of the Whittingtons races a 81C is at Michigan 25 Jul 1981 where he races #94. Given the Whittington's complete lack of attention to livery, I'd be surprised if that wasn't the #94 at Indy.
So that implies Foyt bought the yellow #90.
Does anyone have a colour picture of the #94 at Indy?
Does anyone have a colour picture of the #94 at Michigan?
The #91 meanwhile, had been crashed fairly significantly at Indy. Note that in 1982 Don Whittington's #91 81C is plain yellow and said by Hungness to be Bill's 1981 car - so is that Bill's yellow #90 race car or his #94 practice car? Also in Bill's #94 81C is yellow and is said to be "never run".
So, tentatively, I'd suggest we may have:
81C-"W1": Bill's #90 Indy 1981 - sold to Foyt
81C-"W2": Don's #91 Indy 1981 - wrecked.
81C-"W3": Bill's #94 Indy practice 1981 - Bill's #94 Michigan 1981 - Don's #91 Indy 1982 - Don Indy 1983
81C-"W4": Bill's #94 Indy 1982 - Bill Indy 1983
As to chassis numbers, we still have one piece of information saying Foyt's was 81C/3 and another implying it was 81C/4. I looked in the Lawrence March book and it quotes Dave Reeve saying Don W bought four cars (cash, of course). He is also quoted saying that the prototype was released just in time for Indy practice at the end of March so that must be the yellow 'first car to arrive at Indy' we've seen pictured. (Also, on p147, the Bignotti car is said to have been white originally). So 81C/1 was yellow, 81C/2 was white and one of the later 81C/3 and 81C/4 was red and the other we don't yet know.
Also, we know (but from where) that the Whittington's still had 81C/1 in 1983 so if my theory holds about "W2" being wrecked at Indy in 1981, 81C/1 can only be "W3". Does that logic hold? If it does, the #94 car in 1981 must have been yellow. So then "W1" and "W2" are 81C/3 and 81C/4 but we're not entirely sure which way round. Colours from the March production records would solve this. "W4" would also appear in those production records as a later car.
Now that we know Walther didn't have a 81C, the only other 81Cs were Schuppan's and Fletcher's. There's no sign of a second Bignotti car but I would have expected him to buy a second. So that's four going to the Whittingtons, two maybe to Bignotti and one each to Fletcher and Schuppan. We're still at least one short.
Phew! I need a beer.
Allen