OK - I've just passed through RAF Cranwell myself and here's the essential numbers you need:
Pilot:
Weight: 56.8 - 94.0 Kg
Functional reach (shoulders to thumb-tip):
740 - 900 mm
Sitting height: 865 - 1010 mm
Buttock knee: 560 - 660 mm
Buttock - heel: 1000 - 1200mm
Navigator:
Weight: 56.8 -94.0 kg
Functional reach: 715- 900 (note shorter)
Sitting height: 850 -1020 mm (safe to be alittle bigger)
Buttock-knee: 550 - 660 mm (little shorter)
Buttock - heel: 970 - 1200
OK? Now here's the good stuff. They NEVER check your medical records unless there is aproblem, so if there was a little problem with hayfever etc DON'T SAY ANYTHING!
NEVER mention asthma, it's abar to all aircrew duties.
DO get fit, there's an ECG, and DON'T have corrective eye surgery if you have eye problems, as it's a bar to all flying duties.
If you're scared you may be alittle light, do hat I did and drink a gallon of water five minutes before your medical, to gain a couple of popunds.
More than that, concentrate on getting through the OFFICVER selction more than aircrew selection, it's certainly the hardest part. Email me if you need some advice as I';ve just passed it, OK?
Regards
YakYak (soon to be Navigator)