Here is my funfly airplane for the Minneapolis Piston Popper's Jan. 1 get together. Arrowind 2215/20 motor, 8-6 prop, 3S 2100 mah lipo, 16oz.

Great job!   

Tell more about construction?  Did you get a set of laser cut parts or cut your own?  Were there any glitches in the construction that I should fix?  What lines do you plan to use?

At 16 ounces it is about double the weight of the original, but that just brings its wing loading (cubic wing loading) in line with regular stunters.  I am dying to know how well it carries that much weight, and whether the structure is adequate to do so.

My very best wishes to you for your first flights!

I agree on the spars.  Adequate for performance but a pain when handling the model.  In the past they were even SMALLER!  The weight penalty of going bigger is negligible, so I will.  Good call, thanks.   

As far as the trailing edge thing, the sheeting is really the source of strength in that area, and the stresses are pretty much taken by the spar and ply bellcrank mounts.

How did the Lucky Boxes and control link work out for you? 

The power system you quoted sounds like at least equivalent to a .10, probably a .15.  I would set the power fairly low for first flights, and maybe only 1 minute or less duration.  It took me quite a while to find the right handle spacing, balance point and control horn length. Doing a full 5 minutes, then needing a new battery when you found out what you need to know in a couple of loops is a major bummer.

 Once you find that sweet spot, though, competition beware! 

I scaled it up to the 250 square. It may be a 1/2 inch longer wingspan, but it is very close. The lucky boxes seem to work fine. I left a little slop so they move more freely. In fact, I upped the trailing edge from 1/16 to 3/32 so I have 1/16 piano wire inside 3/32 lucky boxes. Same with the rudder and fill in pieces on the fusalage side. That accounts for a little weight gain, but the majority is in the battery. It wasn't clear to me from the plans how to join the trailing edges so I ended up with a butt joint just outside the sheeting which is why it appeared weak. Even with gussets it had to much play for my taste, so I put in the plywood biscuit. I'll keep the initial flights short till I get a feel for it.

You can always reduce the prop load and reduce the horsepower!
 
Dean P.

Yes, but in the meanwhile even more weight can be reduced by shedding the wings at high speed!
Of course I'm not being serious ... there is no substitute for lightness, but at least the ship could be flown safely for now.
take care,
  Dean

Is the weather that bad?  We want to hear your flight report.