Hi,
I have a Sig Ultimate Fun Fly profile airplane that I crashed quite some time ago. The bottom wing was really the only thing damaged, but it's completely destroyed. I got the urge to tinker with the plane and started to try to convert it to a low-wing airplane. The servos and radio equipment are all in the bottom wing, so I relocated the throttle, rudder, and elevator servos to the fuselage. I put a single servo in the center of the top wing to control the ailerons. Tomorrow I'm planning on fiberglassing the top wing to the underside of the fuselage and trying to fly it.
I don't have much aerodynamics experience...so what exactly is going to happen?

If it's balanced, it will fly. You hight have a really high wing loading though since it was origonally designed for twice the wing area.

The profile fuse is actually not all that heavy, as the plane was designed to be very, very acrobatic. So my thought process is that it will fly a bit more conservative, but still fly. My only worry is that the plane inherently glides like a brick. I can only imagine how it's going to glide with half the wing area

Question .... were the wings staggered on the bipe? If so you prolly need to move the CG forward from the specs.

If they were not staggered, you should be ok.

Take a video camera with you! I'll be glad to host it!

sounds cool ive never seen a low wing profile

Well heres how the big boys do their calculations, one of two things will happen...............................

1) It will fly
2) It wont fly

See I just saved you thousands of dollars in tuition fees and years of schooling!!!!!!!

I think it will fly fine just balance the CG on the spar and it should be fine, the reason most bipes dont glide well it the large amount of frontal area (drag)....

STLPilot,
No, the wings weren't staggered at all, and both wings had the same incidence as well. I have a digital camera, I'll take a few pictures tomorrow when the epoxy is done drying to see what everyone thinks.

The return of the flying brick!!! This is going to make news headlines for sure!! Nah I'm just messing with you Montega. But yes what was said above is very true. It will either fly or it will not fly. Your wing loading is definitely going to be similar to a brick but heck I've seen worse. Give it a shot. Oh and like STL said make sure you video the first flight!

Mike told me that the 2nd wing on a bipe only accounts for about 33% more lift, probably even less on a landing as most of the wind is bled out by the bottom wing in landing configuration if you come in at a positive angle of attack.

Now if the wings were never staggered and one right above the other that's really good news. I had a couple Pitt's bipes and a Dave Patrick Ulty all with staggered wings and the CG was in way in front of the thickest point of the bottom wing, closer to the leading edge.

Since your bipe wings are not staggered ... I cannot not see why this plane won't fly fine.

BUT you are still required to take a video, for educational purposes!

Well things came along nicely. I finished epoxying the wing, and installing the radio equipment. As you can see I went with two aileron servos as opposed to the single one I mentioned earlier. The plywood extension on the top of the fuse with the two holes is where I originally planned to put the switch and charge jack. That will be sanded down eventually. The O.S. .40 LA shown is not a permanent fixture. I'm just using that until I can fix my TT .46 Pro. I'll try to take some video for you on the maiden. I may go today depending on conditions.

Well I've neglected to post, but I did take the plane up for it's maiden a couple of days ago. The good news is that it flies (flew) great. The wing loading wasn't an issue, and it slowed down pretty nice. The bad news is that I experienced some radio trouble and the flight ended before I could see how it landed. I think the plane is gone for good now. It got me a little frustrated but I've decided to completely start over in the hobby. It had been so long (at least 2 years, probably 3) since I crashed it that I'm pretty rusty on my flight skills (especially landing skills). I'll be getting a Kyosho Calmato for the upcoming flying season.

P.S. I did take a video of the flight but due to the lighting (and my cameraman) you can only see clearly the plane taking off. If anyone wants it let me know. I took pictures of the aftermath as well. I'll edit this post and put them in when I get a chance.

I took a fusalage from a balsausa phaeton90 with a gas engine & mounted a wing from a uproar 60 to make it a low wing. It flew great after I put a little incedence in the rear of the wing. Unfortunately I nose dived after radio failure & totaled it out. Everyone laughed at it cause it looked like a trash job. But thats flying.

as a side note- them wings DO HAVE a stagger to them.