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I tapped in your coil dimensions into some old software, and with a 31mm former you would need about 42 turns of? 0.4mm wire closed wound to get about 50uH using a 20mm long former.
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The Q at 1.45 MHz is not that great at about 130. The software below allows any parameter to be edited and so the Q curve and all the data gets updated in real time after each change to the design (turns, diameter, length etc).
It usually produces good results as it's based on the classic tables and graphs for solenoid design. It also uses the classic equations for Q.
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