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Building Tips and technical articles. => 1/2 A building. => Topic started by: Steve Berry on February 17, 2017, 04:10:42 PM
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Hi, all.
This is just a preliminary 1/2A design I'm kicking around. It's an elliptical wing with pseudo I-Beam construction with inspiration from the Tercel (moments) and Spitfire (wing shape). The airfoil is my own with true elliptical leading edge to high point, and smooth arcs from high point to trailing edge.
My thoughts are to use a Norvel BigMig .061 (what I have on hand) but could accommodate up to a .10 or .12 easy enough, with a balloon tank, or perhaps a 2oz. clunk tank.
The name is Mi Sonrisa, named after my wife.
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Sort of marrying the best of WWII with the modern jet age....very cool H^^
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Like !!!
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Outstanding!
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Hi, all.
This is just a preliminary 1/2A design I'm kicking around. It's an elliptical wing with pseudo I-Beam construction with inspiration from the Tercel (moments) and Spitfire (wing shape). The airfoil is my own with true elliptical leading edge to high point, and smooth arcs from high point to trailing edge.
My thoughts are to use a Norvel BigMig .061 (what I have on hand) but could accommodate up to a .10 or .12 easy enough, with a balloon tank, or perhaps a 2oz. clunk tank.
The name is Mi Sonrisa, named after my wife.
I like the top-view very much! The profile look to me needs the canopy moved back and the fin/rudder re-shaped.
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Begs for a NV074. Too much offset. Whats the area ?
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Begs for a NV074. Too much offset. Whats the area ?
The offset, for now, is 3°, and yeah, it looks to be a bit much. The area is neighborhood of 250-260 squares.
Sent from my SAMSUNG-SM-G891A using Tapatalk
EDIT 02/20/17: Ok, just checked it's 260.5" sq. I've changed the engine offset back to 0°. This is still in the design stage, figuring out how I'm going to do some of the internals, but I'm hoping that I can use my BigMig .061. If not, well, I'll have to get a bigger engine. ;D
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Nice looking design. I'd triangulate open fuselage area though - should then be stiffer, more torque resistant, and less subject to warping. 'just a FWIW.
SK
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Nice looking design. I'd triangulate open fuselage area though - should then be stiffer, more torque resistant, and less subject to warping. 'just a FWIW.
SK
I'm actually thinking of making it a 3 piece fuselage. Center section 1/8" and outer skins 1/16", with opposed cutouts (that is, cutout slanting towards back in middle & towards front on the outer skins.
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I like the top-view very much! The profile look to me needs the canopy moved back and the fin/rudder re-shaped.
I'm in this camp. Love the wing and tail elliptical shapes, but think it would be killer with a more classic styling on fuse profile. Thinking along the lines of Joe Adamusko's Stuntress.
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Alright. Been thinking about the suggestions. I've restyled the fuselage, keeping the old one for a future design, to be more in line with "classic" styling. Let me know what you think.
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Alright. Been thinking about the suggestions. I've restyled the fuselage, keeping the old one for a future design, to be more in line with "classic" styling. Let me know what you think.
Re: "The name is Mi Sonrisa, named after my wife." Keep the name Mi Sonrisa and drop the MKII, sounds much better. No matter how many changes keep the airplane name the same and instead version and timestamp the plan.
I like what you are doing when you reach a final I'm tempted to build one too. The only changes I see are: make the canopy larger and reshape the fin/rudder to look like the wing and stab/elevator tips.
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Fuse much better, cant handle that rudder. Agree with CL-flyer on this "The only changes I see are: make the canopy larger and reshape the fin/rudder to look like the wing and stab/elevator tips."
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To all: Here is my (hopefully) final rendition of the MiSonrisa 1/2A stunter. About all that's left is pulling out all the parts and drawing up any needed details for building. I'm also in the process of building a solid 3D model of it in Inventor so that I can more accurately produce the ribs (think of it as a digital version of the lost foam method) and work out the geometry (25° up/down for flaps, 35° up/down for elevators). For now, I have a custom 2.5" bellcrank, but may, for ease of use, bump it to either 2" or 3" - not real sure which way. I'd prefer 3" but the wing is running out of space, real fast.
One other detail that may not be apparent is this. It does have a built-up I-beam spar, with the center piece being 1/8" basswood with 1/16" doublers in the center. It also is using (2) 1/4" thick center ribs glued directly to the fuselage on either side to provide an edge for the covering. The built-up trailing edge, flaps, stabilizer, & elevators, all have 1/32" balsa in the middle that will already have hinge pockets cut out (I hate cutting those things!).
I'd like to go with wing mounted landing gear, but I've never done that before, so for now, I'm sticking with what I know - fuse mounted. Tail skid - a little undecided on that one. I think a simple piece of 1/16" music wire would work so that a loop could be fashioned in the end for stooge launching.
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For the wing landing gear look at an Ares plan which has an I-beam and it's simple system.
Ares
by Bill Werwage
http://outerzone.co.uk/plan_details.asp?ID=4884
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Two air scoops ? Loose the one under the wing.. Stab/elev location too high in fuse. Rudder still to small, its front should be even with front edge of stab.
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Okay, my two cents. I like the fuse on the Mi Sonrisa MKII. The low slung canopy gives it a mean, aggressive look. Now just match that fuselage with the fin/rudder of your first drawing, and it'd be awesome.
Mark
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Try these out. I've got a total of 12 different profiles now. Two fuselage shapes, two canopy outlines, and 3 rudders for each.
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Top view reminds me a lot of a Dixon Charisma.