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We present results of the $Q^{-1}$ and period shift, $\Delta P$, for $^3$Heconfined in a 98% nominal open aerogel on a torsion pendulum. The aerogel iscompressed uniaxially by 10% along a direction aligned to the torsion pendulumaxis and was grown within a 400 $\mu$m tall pancake (after compression) similarto an Andronikashvili geometry. The result is a high $Q$ pendulum able toresolve $Q^{-1}$ and mass coupling of the impurity-limited $^3$He over thewhole temperature range. After measuring the empty cell background, we filledthe cell above the critical point and observe a temperature dependent periodshift, $\Delta P$, between 100 mK and 3 mK that is 2.9$%$ of the period shift(after filling) at 100 mK. The $Q^{-1}$ due to the $^3$He decreases by an orderof magnitude between 100 mK and 3 mK at a pressure of $0.14\pm0.03$ bar. Wecompare the observable quantities to the corresponding calculated $Q^{-1}$ andperiod shift for bulk $^3$He.

Mass coupling and $Q^{-1} of impurity-limited normal $^3$He in a torsion pendulum