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Post by wvrailfan on Dec 9, 2011 0:40:55 GMT 1
I just finished a new Super Cub project. I built this with the intent of using this plane for aieral photography. It uses a HZ SC fuselage and tail, but I used the wing from a Multiplex Fun Cub. It is seven inches wider and two inches deeper, plus it has ailerons and flaps. I made the usual wing saddle and battery box strengthening mods and added 3 inch wheels. It is powered by an E-flite Park 480 with a 40 a ESC spinning a MAS 10X5X3 prop. I painted it neon red and white, with the fuselage covered in Econokote. I didn't follow any prototype, just wanted something easy to see. My goal is not more speed, rather better short take off and landing ability and more lift so I can attach a camera to the plane. Jim Attachments:
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Post by freediverga on Dec 9, 2011 4:40:33 GMT 1
Did you have to modify the fun club wing to fit and how much extra lift did you get with larger wing span. That wing idea sounds really good!
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Post by freediverga on Dec 9, 2011 4:51:29 GMT 1
Are you using the stock HZ transmitter and have you checked to see what power draw was with that 3 bladed prop setup?
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Post by wvrailfan on Dec 9, 2011 7:04:26 GMT 1
The Fun Cub wing is 7 inches wider and 2 inches deeper than the HZ SC wing. I cut a notch in the center of the trailing edge so the wing will fit in the SC saddle. It is held in place with the usual SC rubber bands.
I am using a Spektrum AR600 rx and DX6i tx.
I'm not too worried about the 3 blade prop drawing too much. The 480 motor and 40 a ESC won't be working too hard on a plane this light.
Also, I'm running that prop for thrust not speed, I don't spend that much time over 1/2 throttle. My plan is to mount a Go Pro on the plane and I want a stable platform not a race horse.
With the flaps and added thrust of the 3 blade prop, I'm hoping this thing will take off and land in some tight areas.
Jim
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Post by freediverga on Dec 9, 2011 12:23:19 GMT 1
That's the same kinda of setup I want but not for camera use but to fly in and out of tight landing areas. Excellent design!!! Is there anyway you could take pic of the notch you had to cut post the pic. You wouldn't be insulted if I copied your design would you?
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Post by wvrailfan on Dec 9, 2011 20:22:10 GMT 1
Here is the Fun Cub wing on the Super Cub fuse. You can see how mch the Fun Cub wing extends rearward past the Super Cub wing saddle. Jim Attachments:
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Post by freediverga on Dec 9, 2011 23:40:14 GMT 1
Thank You for posting the pic! I notice no wing struts, I'm guessing your using carbon rod or is the wing thick enough to not need one? How does she fly?
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Post by freediverga on Dec 10, 2011 2:20:58 GMT 1
I read in another forum that you put carbon rods in teh wings did that take out the dihendral-sp. out of the wings?
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Post by wvrailfan on Dec 10, 2011 20:24:32 GMT 1
The Fun Cub wing comes with a spar that gives the wing added strength. It also has much less dihedral than the HZ wing.
Jim
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Post by flydiver on Dec 11, 2011 18:38:42 GMT 1
People have done the same with the Apprentice wing. www.rcgroups.com/forums/showthread.php?t=1199284The carbon rod can be put in the stock wing and dihedral kept: supercubclub.proboards.com/index.cgi?action=display&board=ws&thread=1228Or you can flatten the wing. It's a choice depending on what you hope to accomplish. There is no inherent thrust improvement from a 3-blade prop. More blades actually degrades efficiency. Multiple blades are used when clearance is required (shorter blades) so more can be added to make up for the loss of length. They look kinda cool sitting on the ground too. There actually have been single blade props used. The opposite 'side' uses a weighted stub to balance it. The single blade is the most efficient as the more blades there are the more they create turbulence for each other and degrade the efficiency. |
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