1 ME 442 Senior Project Week 6 Dr. Joseph Vignola Pangborn G43, Phone 202-319-6132, [email protected]@cua.edu Tuesdays & Thursdays, 9:35-12:25 AM,

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ME 442 Senior Project Week 6

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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DocumentationEach member of the group should be sure that you bring ALL electronic files everydaySolidWorks drawings

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DocumentationEach member of the group should be sure that you bring all electronic files everydaySolidWorks drawingsExcel budget and receipts

Taken from http://patheoldminer.rootsweb.ancestry.com/faybuffington.html

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DocumentationEach member of the group should be sure that you bring all electronic files everydaySolidWorks drawingsExcel budget, must be this version or have this information


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DocumentationEach member of the group should be sure that you bring all electronic files everydaySolidWorks drawingsExcel budget, must be this version or have this information

Item(s)Date of purchaseSupplierDate receivedTotal cost (items + shipping and anything else)Who’s credit was used Name of the receipt pdf file

One line per transaction


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DocumentationPlease bring all your electronic files everyday

SolidWorks drawingsExcel budget


It’s best to use the document that I started

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DocumentationPlease bring all your electronic files everyday

SolidWorks drawingsExcel budget


It’s best to use the document that I startedIt’s on the class web page

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Budget Document From here forward you must use my version of the document

The reason is that many of you:

•Made addition mistakes•Didn’t include important information like the date of the purchase and the name of the company you made the purchase from.

Remember:

•One line per transaction not one item•One PDF receipt per transaction for that one line


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PurchasesI need to see the Excel budgets today and everyday

I want to be sure we are keeping careful track of all expenses.

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Materials and PurchasingIt is very import that we straighten the budget today


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12


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MaterialsI can cut materials for you to any dimension, exactly to the dimensions you give me.

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ExpediencyBe sure you are making design decisions based on engineering principles.

Please don’t


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MaterialsAsk Ken to bring specific material you need


Ken

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Materials and PurchasingIt is very import that we straighten the budget today There are problems with the credit card

MNEY

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Materials and PurchasingIt is very import that we straighten the budget today There are problems with the credit card

The card problems include the lost receipts from this class

MNEY

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Materials and Purchasinge-mail Hong right away to schedule time

She is nicer that I am and will help you

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Flight Testing

Jim and Ed want to test Tuesday, Feb 25


That’s 7 days off

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Flight TestingI’m hoping that Ken will schedule and do the technical inspection and taxi tests with you


…and you have to do the taxi test and technical inspection before the flight test

S M T W Th F S

6 7 8

9 10 11 12 13 14 15

16 17 18 Today 19 20 21 22

23 24 25 Flight Test

26 27 28SAE Deadline

May 1

I’m still working on this but the big issues is

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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 new ideas

This will make it easier for you


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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 new ideas Simplify your design

Settle on the details


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Assignment 2Fix assignment 1

A number of groups did not submit assignment 2 or didn’t really update anything


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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


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You should know what each screw is forPlease don’t list random items


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You should know what each screw is forPlease don’t list random items ¼” screws


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You should know what each screw is forPlease don’t list random items ¼” screws, a hammer


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You should know what each screw is forPlease don’t list random items ¼” screws, a hammer, weed wacker


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Ask Jason, Hong, Ken or me what you really need


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Money

Lets start with the group that has the most people here


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Money

Thanks for the help resolving the credit card issues


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Flight Testing

Jim and Ed want to test Monday, Feb 24


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Flight Testing



S M T W Th F S

6 Today 7 8

9 10 11 12 13 14 15

16 17 18 19 20 21 22

23 24 Flight Test

25 26 27 28 29


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Flight Testing



…and you have to do the taxi test and technical inspection before the flight test


S M T W Th F S

6 Today 7 8

9 10 11 12 13 14 15

16 17 18 tech insp taxi test

19 20 21 22

23 24 25 Flight Test

26 27 28 1

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So Given the Calendar

Work with Ken, Hong, Don, and Me


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Flight Test

I would like you to make all the arrangements regarding getting up to the airfield Tuesday.


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Money

Thanks for the help resolving the credit card issues

Today we can start with group ?


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Myths and TruthsMyths Gorilla Glue is no stronger than ordinary carpenters glue


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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


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Ken brought enough wood for everyone


Ken

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Ken brought enough wood for everyone

Purchase always come through as hoped


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Myths and TruthsTruthsRound holes are easier to make then not round holes


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Myths and TruthsTruthsRound holes are easier to make then not round holes

Hong needs some sleep


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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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mg

thrust

Wing drag

tail drag

fuselage dragx

z

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mg

thrust

Wing drag

tail drag

fuselage dragx

z

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mg

thrust

Wing drag

tail drag

fuselage dragx

z

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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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Landing gear must be strong enough

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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

[email protected]

Today I would like to see Excel budgets

Documents

1 ME 442 Senior Project Week 6 Dr. Joseph Vignola Pangborn G43, Phone 202-319-6132, [email protected]@cua.edu Tuesdays & Thursdays, 9:35-12:25 AM,