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ME 442 Senior Project Week 3
Dr. Joseph VignolaPangborn G43, Phone 202-319-6132, [email protected]
Tuesdays & Thursdays, 9:35-12:25 AM, Pangborn G43
Office Hours: Tuesdays, 1:00-2:00 PM
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University MassThe University Mass is today so will finish today at 11:50
The mass begins at 12:10 pm in the upper church of the Shrine,
Taken from http://patheoldminer.rootsweb.ancestry.com/faybuffington.html
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DocumentationPlease bring all your electronic files everyday
SolidWorks drawings
Taken from http://patheoldminer.rootsweb.ancestry.com/faybuffington.html
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DocumentationPlease bring all your electronic files everyday
SolidWorks drawingsExcel budget
Taken from http://patheoldminer.rootsweb.ancestry.com/faybuffington.html
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DocumentationPlease bring all your electronic files everyday
SolidWorks drawingsExcel budget
Taken from http://patheoldminer.rootsweb.ancestry.com/faybuffington.html
It’s best to use the document that I started
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DocumentationPlease bring all your electronic files everyday
SolidWorks drawingsExcel budget
Taken from http://patheoldminer.rootsweb.ancestry.com/faybuffington.html
It’s best to use the document that I startedIt’s on the class web page
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PurchasesI need to see the Excel budgets today and Thursday
I want to be sure we are keeping careful track of all expenses.
Taken from http://patheoldminer.rootsweb.ancestry.com/faybuffington.html
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Materials and PurchasingIt is very import that you start purchasing now
There will be problems with the credit card
Ask Ken to bring specific material you need
Taken from http://patheoldminer.rootsweb.ancestry.com/faybuffington.html
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Machine ShopPlease work with Don, Hong or anyone that has built things
Show them sketches of ideas and be open to changes
Taken from http://patheoldminer.rootsweb.ancestry.com/faybuffington.html
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Machine ShopPlease work with Don, Hong or anyone that has built things
Show them sketches of ideas and be open to changes Simplify your design
Taken from http://patheoldminer.rootsweb.ancestry.com/faybuffington.html
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Machine ShopPlease work with Don, Hong or anyone that has built things
Show them sketches of ideas and be open to changes Simplify your design
Settle on the details
Taken from http://patheoldminer.rootsweb.ancestry.com/faybuffington.html
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Machine Shop SafetyWe now have the School of Engineering Safety Rules
Everyone must read, understand and sign
Signature page must be clear and readable
Schedule shop time with Hong
Taken from http://patheoldminer.rootsweb.ancestry.com/faybuffington.html
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Assignment 2Fix assignment 1
The first six (now five) part design support document was due Tuesday. Want an A? Generally speaking come talk to me before its due and I will go over it with you.
I’ll help you edit it and then you’ll have all the information the A will be yours.
We will start with group 1 and work backwards
Maybe I can do two groups at a time
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Assignment 2Fix assignment 1
Toolbox Please just list what you need to carry to the airfield.
Glue that take overnight to dry is probably not appropriate for that list but cyanoacrylate glue (Superglue) is
You should know what each screw is for
Taken from http://patheoldminer.rootsweb.ancestry.com/faybuffington.html
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Assignment 2Fix assignment 1
Toolbox Please just list what you need to carry to the airfield.
Glue that take overnight to dry is probably not appropriate for that list but cyanoacrylate glue (Superglue) is
You should know what each screw is forPlease don’t list random items
Taken from http://patheoldminer.rootsweb.ancestry.com/faybuffington.html
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Assignment 2Fix assignment 1
Toolbox Please just list what you need to carry to the airfield.
Glue that take overnight to dry is probably not appropriate for that list but cyanoacrylate glue (Superglue) is
You should know what each screw is forPlease don’t list random items ¼” screws
Taken from http://patheoldminer.rootsweb.ancestry.com/faybuffington.html
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Assignment 2Fix assignment 1
Toolbox Please just list what you need to carry to the airfield.
Glue that take overnight to dry is probably not appropriate for that list but cyanoacrylate glue (Superglue) is
You should know what each screw is forPlease don’t list random items ¼” screws, a hammer
Taken from http://patheoldminer.rootsweb.ancestry.com/faybuffington.html
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Assignment 2Fix assignment 1
Toolbox Please just list what you need to carry to the airfield.
Glue that take overnight to dry is probably not appropriate for that list but cyanoacrylate glue (Superglue) is
You should know what each screw is forPlease don’t list random items ¼” screws, a hammer, weed wacker
Taken from http://patheoldminer.rootsweb.ancestry.com/faybuffington.html
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Assignment 2Fix assignment 1
Toolbox Please just list what you need to carry to the airfield.
Ask Jason, Hong, Ken or me what you really need
Taken from http://patheoldminer.rootsweb.ancestry.com/faybuffington.html
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Myths and TruthsMyths Gorilla Glue is no stronger than ordinary carpenters glue
Taken from http://patheoldminer.rootsweb.ancestry.com/faybuffington.html
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Myths and TruthsMyths Gorilla Glue is no stronger than ordinary carpenters glue You can make a part bigger then the travel range of the CNC machine
Taken from http://patheoldminer.rootsweb.ancestry.com/faybuffington.html
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Myths and TruthsMyths Gorilla Glue is no stronger than ordinary carpenters glue You can make a part bigger then the travel range of the CNC machine
Ken brought enough wood for everyone
Taken from http://patheoldminer.rootsweb.ancestry.com/faybuffington.html
Ken
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Myths and TruthsMyths Gorilla Glue is no stronger than ordinary carpenters glue You can make a part bigger then the travel range of the CNC machine
Ken brought enough wood for everyone
Purchase always come through as hoped
Taken from http://patheoldminer.rootsweb.ancestry.com/faybuffington.html
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Myths and TruthsTruthsRound holes are easier to make then not round holes
Taken from http://patheoldminer.rootsweb.ancestry.com/faybuffington.html
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Myths and TruthsTruthsRound holes are easier to make then not round holes
Hong needs some sleep
Taken from http://patheoldminer.rootsweb.ancestry.com/faybuffington.html
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You need to know where the CG isWeighted averages.
x
y
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Mass and Aerodynamic Centers Weighted averages.
x
y
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Mass and Aerodynamic Centers Weighted averages. Pick an origin
x
y
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Mass and Aerodynamic Centers Weighted averages. Pick an origin, make a table
x
y
component Mass (kg) x-location (cm)
engine 0.45 -3
fuselage 2.1 75
Wing 2.3 27
Front landing gear 0.35 12
Rear landing gear 0.64 34
Fuel tank 0.33 8
Radio reciever 0.25 7
tail 0.75 150
Payload
Total 7.17 319
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Mass and Aerodynamic Centers Weighted averages. Pick an origin, make a table
x
y
component Mass (kg) x-location (cm)
engine 0.45 -3
fuselage 2.1 75
Wing 2.3 27
Front landing gear 0.35 12
Rear landing gear 0.64 34
Fuel tank 0.33 8
Radio reciever 0.25 7
tail 0.75 150
Payload
Total 7.17 319
51.2 cm
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Mass and Aerodynamic Centers Each component that is exposed to the exterior flowHas a net drag force that acts on that component
The magnitude of that force is
51.2 cm
These drag forces occur at specific locations
These location must be determined
Once you have them
x
z
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Mass and Aerodynamic Centers Each component that is exposed to the exterior flowHas a net drag force that acts on that component
The magnitude of that force is x
z
51.2 cm
These drag forces occur at specific locations
These location must be determined
Once you have them
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Mass and Aerodynamic Centers
x
z
51.2 cm
Once you have them…
DRAW A FREE BODY DIAGRAM
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Mass and Aerodynamic Centers Once you have them Then sum forces andmoments
mg
thrust
Wing drag
tail drag
fuselage drag
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Mass and Aerodynamic Centers Once you have them Then sum forces andmoments
mg
thrust
Wing drag
tail drag
fuselage dragx
z
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Mass and Aerodynamic Centers Once you have them Then sum forces andmoments
mg
thrust
Wing drag
tail drag
fuselage dragx
z
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Mass and Aerodynamic Centers Once you have them Then sum forces andmoments
mg
thrust
Wing drag
tail drag
fuselage dragx
z
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Mass and Aerodynamic Centers Once you have them Then sum forces andmoments
mg
thrust
Wing drag
tail drag
fuselage dragx
z
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Mass and Aerodynamic Centers This summing for moments is precisely the same as the weighted average
x
z
51.2 cm
component Net drag (N) z-location (cm)
x-location (cm
fuselage 2.7 5 44
Wing 15.3 17 45
Front landing gear
3.5 -12 34
Rear landing gear
5.8 -11 76
tail 13.7 21 125
Total 40.7
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You MUST include this informationThis summing for moments is precisely the same as the weighted average
x
z
51.2 cm
component Net drag (N) z-location (cm)
x-location (cm
fuselage 2.7 5 44
Wing 15.3 17 45
Front landing gear
3.5 -12 34
Rear landing gear
5.8 -11 76
tail 13.7 21 125
Total 40.7
So have a figure with YOUR plane, a coordinate system, and the location of the centers
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Design to Meet ObjectivesThe objectives are requirements and constraints
Requirements and constraints are separate
Requirements: what you are expecting from the full system or subsystem
Constraints: what you are stuck with
They must be specific
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Design to Meet ObjectivesThe objectives are requirements and constraints
Requirements and constraints are separate
Requirements: what you are expecting from the full system or subsystem
Constraints: what you are stuck with
They must be specific
Landing gear must be strong enough
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Design to Meet ObjectivesThe objectives are requirements and constraints
Requirements and constraints are separate
Requirements: what you are expecting from the full system or subsystem
Constraints: what you are stuck with
They must be specific
Landing gear must be strong enough
Must remain elastic for 3 f/s vertical fall will transferring less that a 2 g impulse to the fuselage
Requirements and ConstraintsThere MUST be requirements and constraints for the plane itself Every subsystem MUST have bulletined requirements and constraints listed separately
The should have numbers and be specific
Fuselage RequirementsHold: 4 cell battery (based on 6 minute flight)z57 model radio receiver (with link to data sheet)27 lbs payload at plane’s unloaded CG and wing’s CLRemovable wing mount able to transfer 42 lbs from wing to fuselage. Engine mount within ± ½ in of current estimate of plane’s aerodynamic centerTransfer 2 x planes full weight (84 lbs) to landing gear…
Support 2.5 lb horizontal force generated by tail with rudder at full deployment…
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ME 442 Senior Project Week 3
Dr. Joseph VignolaPangborn G43, Phone 202-319-6132, [email protected]
Tuesdays & Thursdays, 9:35-12:25 AM, Pangborn G43
Office Hours: Tuesdays, 1:00-2:00 PM
Week 3
Build
Week 3
Please email your t-shirt size to Ms. Hicks and Nicole Bull
Today I would like to see Excel budgets