ORIGINAL: Yak 52
ORIGINAL: pimmnz
....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....
Well according to the figures provided, the stall speed is going to be about 4.8m/s so he's not going to be able to go much slower! I'm with you on reducing weight... for indoors anyway.
The calculated stuff is simply wrong. A case of GIGO
The VAPOR will fly easily at less than ONE meter per second- held at a high angle of attack.
That's at 4350 ft elevation .
we probably have 50 hours flying time on this simple model design. Our group meets during the week for social indoor flying - usually a half dozen VAPORS cruising lazily or looping etc..
Trying to duplicate the same speeds with conventional looking stuff simply has not worked - the weight (wing loading) simply gets out of hand.
IF- you make the model larger, the loading can increase.
An example : the VAPOR is about 60 sqin and weighs 17grams
A GOOD, competitive indoor aerobatic setup is 300 sq in and weighs under 5 ounces
The wing loading of 1-2 ounces per sq ft is where you need to be .
Airfoil? just a plate is fine.