HP-11 polars

What is this "polar" you speak of?

But seriously, I don't think that anybody ever did a definitive polar for the HP-11. And when it comes down to it, the individual aircraft differ enough that there can't really be one polar that precisely describes them all.

When I was campaigning a 15-meter HP-11 in regional cross-country and contest events, I just used the Libelle polar and shifted it down a tad to assume a best L/D of 34:1. I based my MacCready ring on that, and it seemed to work OK.

For the flaps, I just used whatever felt about right. I generally towed and thermalled with +10, few best L/D at 0, cruised at about -4 and used about -8 at ludicrous speed.

Thanks, Bob K.