Question - Wing Loading - Plane 95% built
#1
Question - Wing Loading - Plane 95% built
Question regarding wing loading on a model. I finished a scratch built F-18 from RCM plans. The plane is a 0.40 pusher prop design, and the plans call for a completed weight between 5~5.5 lbs. The plans state the wing area is 500 sq. inches. I'm at 5.5lbs now with landing gear, radio equipment, but no engine installed. Thinking of using an ST 0.51. With the engine, mount, muffler and pump I am adding 18oz to the back end of the model.My completed weight of the model would be6.5 lbsbefore flying. Any concerns?
Jim
#2
My Feedback: (5)
RE: Question - Wing Loading - Plane 95% built
Jim, wih a finished weight of 6.5 pounds(104 ounces) and a wing area of 500 square inches(3.47 square feet) your wing loading is going to be 30 ounces per square foot. This is substantial comsidering the shape of the wing but still tolerable. Just keep your speed up on the approach. Dan.
#5
RE: Question - Wing Loading - Plane 95% built
Thanks for the opinion fellows. I'll have to watch for this when it comes time to fly the plane. I have at least 4 months to think this through, have to wait for the snow to melt. The little we have could be gone in a couple of days at above zero degrees.
Jim
Jim
#7
RE: Question - Wing Loading - Plane 95% built
No, David I started this plane about 3 years back. I purchased a Bisson pitts muffler and extra back plate for a super tiger GS45 or 51. Didn't expect the plane to come out over weight. Too little painting experience and too much paint. Live and learn.
Jim
Jim
ORIGINAL: dhal22
Jim, was this the plane you were going use my .55 AX on?
Jim, was this the plane you were going use my .55 AX on?
#8
RE: Question - Wing Loading - Plane 95% built
ORIGINAL: Jim_Purcha
No, David I started this plane about 3 years back. I purchased a Bisson pitts muffler and extra back plate for a super tiger GS45 or 51. Didn't expect the plane to come out over weight. Too little painting experience and too much paint. Live and learn.
Jim
No, David I started this plane about 3 years back. I purchased a Bisson pitts muffler and extra back plate for a super tiger GS45 or 51. Didn't expect the plane to come out over weight. Too little painting experience and too much paint. Live and learn.
Jim
ORIGINAL: dhal22
Jim, was this the plane you were going use my .55 AX on?
Jim, was this the plane you were going use my .55 AX on?
Sandpaper may be your friend.... [] That is, if push comes to shove.. You could remove 2 to 4 oz. of weight and repaint verrrry lightly to bring back the shine or buff like crazy. No good way out of this one. Go fly it and see what it's like before making a rash decision.
Ken
#9
RE: Question - Wing Loading - Plane 95% built
Ken, that is the last thing I want to do. I'll fly it first. It was a challenge to mask and paint it the first time.
There was a lot of sanded balsa blocks and 3/16" balsa (sides)used in this design. The wings were also fully sheeted. The fins and stabalizers were 3/16" sheet. Next time (if there is a next time), open bays construction on the wings, 1/8" sides, ultrakote in stead of paint.
Jim
Sandpaper may be your friend.... [] That is, if push comes to shove.. You could remove 2 to 4 oz. of weight and repaint verrrry lightly to bring back the shine or buff like crazy. No good way out of this one. Go fly it and see what it's like before making a rash decision.
Ken
#10
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RE: Question - Wing Loading - Plane 95% built
Jim,
To put you in the picture - "floaters" like theMini Pulseetc have a wing loading of around 10 - 12 oz/ft2, in generalsport planes have wing loadings in the vicinity of15 - 18oz/ft2 .
You are at around 30oz/ft2. I have a Aviomodelli Piper Arrow II which is at 30 oz/ft2. It is a bit on the heavy side but flies and land ok - but that is with a straight wing and and a NACA 15 airfoil (if I'm not mistaken). You have a swept back and thinner wing - make sure you have around 50 m of runway - maybe more in the beginning. Once in the air, go up toa safe distance and fly slow - get to read the stall characteristics and recovery. Then apply it to your landings - you will probably have to come in a little hot,
Good luck
Bundu
To put you in the picture - "floaters" like theMini Pulseetc have a wing loading of around 10 - 12 oz/ft2, in generalsport planes have wing loadings in the vicinity of15 - 18oz/ft2 .
You are at around 30oz/ft2. I have a Aviomodelli Piper Arrow II which is at 30 oz/ft2. It is a bit on the heavy side but flies and land ok - but that is with a straight wing and and a NACA 15 airfoil (if I'm not mistaken). You have a swept back and thinner wing - make sure you have around 50 m of runway - maybe more in the beginning. Once in the air, go up toa safe distance and fly slow - get to read the stall characteristics and recovery. Then apply it to your landings - you will probably have to come in a little hot,
Good luck
Bundu
#11
RE: Question - Wing Loading - Plane 95% built
I remember it was a 40 AX. Have to get this plane in the air this summer.
What about your Blue Angel? Is it flown yet?
Jim
What about your Blue Angel? Is it flown yet?
Jim
ORIGINAL: dhal22
Jim, was this the plane you were going use my .55 AX on?
Jim, was this the plane you were going use my .55 AX on?
#12
My Feedback: (11)
RE: Question - Wing Loading - Plane 95% built
ORIGINAL: All Day Dan
Jim, wih a finished weight of 6.5 pounds(104 ounces) and a wing area of 500 square inches(3.47 square feet) your wing loading is going to be 30 ounces per square foot. This is substantial comsidering the shape of the wing but still tolerable. Just keep your speed up on the approach. Dan.
Jim, wih a finished weight of 6.5 pounds(104 ounces) and a wing area of 500 square inches(3.47 square feet) your wing loading is going to be 30 ounces per square foot. This is substantial comsidering the shape of the wing but still tolerable. Just keep your speed up on the approach. Dan.