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| Joined: | Thu Mar 26th, 2009 |
| Location: | Colorado USA |
| Posts: | 10254 |
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stew77 wrote:Happy humpday 3T...Hamilton X-Wind today...
Unique case back, Chris. Can you share what the index and numbers are for? Is it truly functional?
Hi Jeff, agree...the case back is unique on this one (and I always love stealing a peek at the beautiful Valjoux 7750 engine and nicely engraved Hamilton rotor on this one).
The index and numbers are functional if you are a pilot (but I would say not very practical to use in real life at all). The manual goes into a fair amount of detail on how you calculate crosswind with this timepiece. The index and numbers on the back are used in conjunction with calculated values from the rotating bezels on the front (The caseback graph denotes cross wind angles in degrees, the y-axis is crosswind component in mph, the left side denotes the headwind component in mph, and right side denotes the tailwind component in mph)....the detail on this goes on and on and, I have taken no effort to really understand how to do the calculations my friend...
...so functional, yes ....practical, definitely not happy.gif