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If distance you may want to figure on a slightly lower Cl and trim for speed.

You still did not say if this is a distance mission or duration. You're 360 sq inches will probably work out to a roughly 4 foot span and it's not hard at all to keep the model weight to under a pound in this size range and still have a good structural strength.Īnd at a 2 lbs or less AUW you won't have any problems launching the model at the new flying speed.

And if you plan on using the pennies as a shiftable nose weight you can optimize the model much better by eliminating any form of trim weight. There's no reason at all that you can't build the model down to a single pound or less with a little care and attention. I also have a question about the overall weight numbers. I'm not sure you'll be able to do that without some form of launch rail or other method. Polyslo, I make it out that you'll need to toss this thing at a whopping 27 mph. We used to use them on small gliders back in the day.Īlso check out any and all published material from Mark Dreala. I believe the E214 takes a dump at low Rn. I think the "old" recipe may be better for a weight hauling contest. Back in 1987, many of us were using thicker airfoils like the E214 with higher wing loading. The modern equation for high performance sailplanes is thin wings and very low weight. It's achilies heel is mid to low lift coefficients where L/D starts to look stinky. You have to be careful with the sheeting in this area. It does have a severe underchamber close to the trailing edge though. It is very thick and should be easy to build strong. I guess I would still go with the old E214. It will also cruise when you push the nose down. It has lower wing loading and will really float. I still have a 120 inch Alcyone with a 7032 at the root transitioning to a 7037 at the tip. It had a turbulator at 20% chord (mandatory according to Selig). It was quite heavy for it's size, but the E214 seemed to do well. The E214 was in a 100 ich Dodgson Camano.