Originally Posted by
flywilly
Hi Ken,
Your 85% Black Magic would probably need a YS 115 to have the same performance as the Runaround. BJ Craft has produced several '70' sized models. You can go to their website and check them out. Typically about 59 or 60" long with wing area in the 620-680"sq. range.
Just about where the 80% B.M falls. When I first saw the 85% plans my first thought was "This is a 120 size plane".
Originally Posted by
Anthony-RCU
One concern is wing area. A general target for pattern planes is 100 sq"/pound or a little less. I would think your target would be in the 800 sq" range
Now we're learning something useful!
OK! Thanks for the input. The 80% plane has a wing area of 680 " sq., so I'm in the ball park there. I might shorten the fuse just a tad???? to make a "square" airplane. The wings and tail surfaces are currently at 82% so will leave them alone. FWIW, the YS 91 on that Xcelerator plane I had did a pretty good job of hauling it around. It was all of 10 pounds, with (I think) a 64 inch wing span and about 700ish sq inches. Like was mentioned, parasitic drag is the enemy, or not depending on your point of view. I don't think a lack of power will be an issue. I just need to have flying speed.
Thanks again!
Ken