Cox engine size?

Here's the conversion table:





For CI smaller than 1, choose a higher number and move the comma to the left:

e.g. You're looking for .049 CI. Take 490 CI and move the comma 4 digits to the left to obtain 0,049. This gives 0,8030 CC. The table also works the other way around.

Hope this helps.

Lieven

C.I.x16.387=C.C
C.C./16.387=C.I.

So a 1.5 C.C. Cox equivalent would be a TD or Medallion .09

Is it my understanding that a .09 is considered 1/2A in the European countries? I've been told this and I just wanted confirmation, Ken

Thankyou guys, now I hope to be able to do a simple equivalents chart.

Cheers:flying:

The A.M.A. standard definition is as follows

Free flight
Class 1/2A: .000—.050 cubic inch
Class A: .051—.200 cubic inch
Class B: .201—.300 cubic inch
Class C: .301—.400 cubic inch
Class D: .401—.670 cubic inch

Control line
Class 1/2A: .0000—.0504 cubic inch
Class A: .0505—.1525 cubic inch
Class B: .1526—.3051 cubic inch
Class C: .3052—.4028 cubic inch
Class D: .4029—.6500 cubic inch

In the UK, I see no reference to Class A through D.

In the UK - now going back to the 70's, the "Nationals" used the above 1/2 A standard for the competition.

The only defined 1/2A competitions were:-

1/2A Power - Free Flight (timed engine run and then glide)
1/2A Team Race - Control Line
Mouse Race Class 1 - Control Line

The Mouse Race Class 1 - restricted as above to .0504 Cubic Inches but dominated (In 1971, anyway, by what was described as expensive TD 049s)

I notice that the Mouse Race Class 1 in North America has been chamged to reed valve engines only.

The results for 2011 show a 1/2A combat class.

http://www.bmfa-nats.org/results.shtml

I believe this is still restricted to .0504 cubic inches.