ORIGINAL: pimmnz
Maybe Yak, but then this OP wants to fly indoors in a hall, and knowing the stall speed ain't gunna be any help at all, for one, as stated, without really accurate telemetry from model to pilot, he isn't gunna know what speed it's flying, and two, if he wants to turn around at the end of the hall he will have to be travelling somewhat is excess of minimum, otherwise the thing will just flop on the floor. Your Reynolds might be good at 5 m/s, but I bet he wants to go a bit slower than that...If the object is to fly this thing indoors, then perhaps the questions he needs to be asking is how to build the thing really light, with adequate strength.
Evan, WB #12.
Sorry for my bad english, but what is an OP?
Yak> the airfoil is not flat bottomed.
About weight, I offcorse agree, the lighter the better. The "Shocks" we flies today is about 130-140g, and thats fine. But - when we started on those planes, the weight was about double-up, and they where still flyable and easy to make lots of aerobatic in a small area.
And about learn to build light, this plane was NOT intended for indoor - trying fly it indoor is just a result of provocation from my flying-"friends"
Years ago i build this "Cub" in depron. It was 63 inch, and with a .50 Irvine the weight was 77 Oz. There was no problem flying in the area of handball court.
An indoor handball court is huge