vickers vimy scale data
a series of ratios to create a scale airplane.
* * * * * * * * *
Vickers Vimy Ratios
WS = Wing Span
L = Fuse Length
C = Center line
CH = Wing Chord
GD = Landing Gear Diameter
GW = Landing Gear Width
WH = Wing Height (from bottom wing)
FW = Fuse Width
FH = Fuse Height
SF = Stabliaser Flap
SH = Stabliser Height (from bottom wing)
RH = Rudder Height
RC = Rudder Chord
SLE= Stab Leading Edge
SC = Stab Chord
P = Porpeller Diameter
PW = Pod Width
How this works. to find the Fuse Length the ratio is WS:L 1.5:1
so we take WS and divide by 1.5 to get the Fuse Length.
For the propeller width, there is no direct ratio. but the motor
pod sit between spars 1 and 2. there is a ratio for the propeller
to the motor pod width. in this case, you would take the distance from
Spar 1 to Spar 2, (width of the motor pod) and multiply by 2.54 to get
the propeller width.
For example, a 18 inch wing span, the distance from S1-S2 if 18.2, so
we get a distace of .98 inches for the motor pod. taking the .98 inch
figure, we multiply .98 by 2.54 to get 2.51 inch diameter propeller.
WS:S1-S2 18.2:1 (this is the pod width)
P:PW 2.54:1 (Propeller Width)
the rest of the motor pod measurements need some description.
there are 8 measurements.
1. is the diameter of the front motor pod plate.
2. is the diameter of the motor pod after the first transition.
3. is the distance from the top of the front plate to the prop shaft
4. is the over all length of the motor pod, not including engine exhaust
5. is the distance from the end of the motor pod to the end of the engine exhuast pipe
6. is the height of the engine exhuast, bottom of the pipe to the top of the headers
7. is the height of the rear motor pod plate
8. is the distance from the front plate to the second transition
all ratios taken from the propeller width
landing gear is directly under the motor pod
the alirons have a distintive shape. there is a curve that extendes past the flap chord.
there are 4 ratios for the flap.
1. width of the curve, wing tip to outer curve
2. aliron width, from the inner tip of the aliron to the wing tip
3. length from the flap T.E. to the wing side of the flap L.E.
4. length of the curve over all.
all ratios based of wingspan.
Wow! That seems over complicated to this old guy.
I think you could, first of all, take the span of the full size Vimy, 13.28 M and establish what the model will span at the desired scale. Say we are to build at 1/10 scale that will make the model 1328mm wing span.
Measure the span on a print of a 3 view at any scale that comes out of the printer.
Say that measurement is 185mm, that means if we divide 1328 by 185 we get 7.1783783.
Enter 7.1783783 into your calculator and add it to memory so you not keying it in every time.
Then measure from the 3 view and multiply by 7.1783783 and... that's it.
Sheesh! All I do is import a 3view into Sketchup. Size if for the span I need then start pulling dimensions. If you want to play with the size go the extra step and trace out major parts and pull dimensions from the tracing. Then when it's resized everything is automatically recalculated.
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