background image

Fokker

 

Dr.1

 

46.7”

 

1/6

 

Scale

    

Page

 

 

17

 
 

 

Copyright©

 

2007

11

   

M.K.

 

Bengtson

  

All

 

Rights

 

Reserved

   

Rev

  

07/11

 

 

 

Once

 

I

 

had

 

the

 

top

 

wing

 

in

 

place

 

and

 

resting

 

on

 

top

 

of

 

the

 

interplane

 

struts,

 

it

 

was

 

easy

 

to

 

adjust

 

the

 

length

 

and

 

angles

 

of

 

each

 

of

 

the

 

cabanes,

 

and

 

then

 

solder

 

the

 

two

 

pieces

 

back

 

together

 

again.

 

 

The

 

fit

 

of

 

the

 

interplane

 

struts

 

is

 

really

 

first

 

rate.

 

The

 

alignment

 

and

 

incidence

 

was

 

bang

 

on

 

what

 

is

 

shown

 

on

 

the

 

plans.

  

 

 

 

WHEELS

 

 

Gluing

 

the

 

ply

 

sides

 

on

 

the

 

3/8”

 

balsa

 

core

 

makes

 

the

 

basis

 

for

 

the

 

wheels.

 

Use

 

the

 

brass

 

hub

 

for

 

alignment.

 

Epoxy

 

the

 

hubs

 

in

 

place

 

and

 

add

 

a

 

sufficient

 

amount

 

of

 

epoxy

 

around

 

the

 

base

 

of

 

the

 

hub

 

to

 

reinforce

 

the

 

connection

 

of

 

the

 

hub

 

to

 

the

 

ply.

 

Plywood

 

reinforcing

 

hubs

 

are

 

provided

 

that

 

are

 

to

 

slip

 

over

 

the

 

brass

 

tubing

 

as

 

shown.

   

Next,

 

CA

 

glue

 

the

 

neoprene

 

cording

 

together

 

to

 

from

 

a

 

“tire”.

 

Use

 

thin

 

CA

 

sparingly

 

as

 

the

 

CA

 

bonds

 

very

 

aggressively

 

to

 

the

 

rubber.

 

Press

 

the

 

CA

 

wetted

 

ends

 

together

 

for

 

an

 

instant

 

bond.

 

The

 

best

 

way

 

to

 

align

 

the

 

ends

 

is

 

to

 

glue

 

them

 

while

 

they

 

are

 

in

 

place

 

on

 

the

 

wheel.

 

Then

 

attach

 

the

 

tires

 

to

 

the

 

wheels

 

and

 

CA

 

in

 

place.

 

A

 

thin

 

bead

 

of

 

CA

 

around

 

the

 

rim

 

makes

 

for

 

a

 

secure

 

tire.

  

Paper

 

cones

 

are

 

cut

 

out.

  

Use

 

a

 

ball

 

point

 

pen

 

to

 

score

 

each

 

line

 

on

 

the

 

back

 

to

 

make

 

an

 

impression

 

of

 

“spokes”

 

It

 

is

 

helpful

 

to

 

do

 

this

 

operation

 

on

 

a

 

paper

 

tablet

 

so

 

that

 

the

 

pen

 

makes

 

a

 

good

 

crease.

 

Fold

 

the

 

paper

 

along

 

the

 

crease

 

lines

 

to

 

exaggerate

 

the

 

raised

 

lines.

 

One

 

of

 

the

 

sections

 

forming

 

a

 

wedge

 

is

 

cut

 

out.

  

Make

 

cuts

 

to

 

the

 

center

 

of

 

the

 

circle

 

along

 

a

 

pair

 

of

 

the

 

spokes.

  

Close

 

the

 

paper

 

cutout

 

to

 

form

 

a

 

cone

 

and

 

tape

 

the

 

joint

 

inside

 

the

 

cone.

  

The

 

inside

 

cones

 

may

 

now

 

be

 

attached

 

to

 

the

 

wheels.

 

The

 

outside

 

cones

 

may

 

be

 

attached

 

at

 

this

 

point

 

if

 

wheel

 

collars

 

are

 

to

 

be

 

used.

 

Alternatively,

 

after

 

installing

 

the

 

wheels

 

on

 

the

 

landing

 

gear,

 

a

 

washer

 

may

 

be

 

soldered

 

to

 

hold

 

the

 

wheel

 

in

 

place

 

and

 

then

 

the

 

cone

 

is

 

attached.

 

This

 

method

 

makes

 

a

 

very

 

nice

 

scale

 

appearance.

   

 

 

 

UNDERWING

 

I

 

think

 

Anthony

 

Fokker

 

designed

 

the

 

landing

 

gear

 

wing

 

just

 

to

 

drive

 

modellers

 

crazy.

 

It

ʹ

s

 

a

 

big

 

surface

 

with

 

a

 

narrow

 

mounting

 

area,

 

and

 

in

 

a

 

position

 

where

 

it

 

is

 

bound

 

to

 

receive

 

a

 

few

 

blows.

 

 

With

 

that

 

in

 

mind,

 

I

 

wanted

 

to

 

make

 

sure

 

the

 

wing

 

was

 

mounted

 

securely

 

to

 

the

 

undercart

 

struts,

 

but

 

not

 

so

 

secure

 

that

 

there

 

was

 

no

 

give.

 

The

 

bottom

 

of

 

the

 

LG

 

wing

 

is

 

3/16

 

balsa.

 

At

 

first

 

I

 

thought

 

that

 

this

 

was

 

way

 

to

 

heavy,

 

Содержание Fokker Dr.1 46.7"

Страница 1: ... All Rights Reserved Rev 07 11 Fokker Dr 1 46 7 1 6 Scale R C Scale Model Instructions CONTACT INFORMATION Designed by M K Bengtson Prototype by Frank Jaerschky Manufactured and Distributed by Bengtson Company e mail sales aerodromerc com www aerodromerc com ...

Страница 2: ...Builder Frank Jaerschky The following is taken from Frankʹs comments in building the model FUSELAGE Assembly starts by gluing together the two 3 16ʺ parts that make the left and right forward fuselage sides There are precut slots and holes for bolts and formers so make sure you open them up I like to use yellow aliphatic glue It gives me time to correct mistakes Makes for a slightly longer build t...

Страница 3: ... should have done this step before adding the doublers I like to build both sides one on top of the other separated by plastic wrap or wax paper to make sure they are identical With the doublers I will have a 1 16ʺ gap between the balsa sides if I lay them on top of each other Iʹll just make a temporary 1 16ʺ spacer to go between the sides The rudder assembles easily with laser cut 3 16ʺ sheet pie...

Страница 4: ...A square slid up to the outline of the fuselage on the plan is used for alignment If the vertical leg of the square just touches the edge of the longerons you know youʹre ʺOnʺ The balsa cross members were cut to length from the top view and then glued into place Again the square was used to make sure everything stayed aligned The top formers were then glued on top of the cross members The forward ...

Страница 5: ...ames and spacers Larger frame on the right is the rear of the cowl and actually forms part of the middle upper wing retention system COWL The ply sheeting is supplied in 3 pieces Instead of butt gluing the sheeting I sanded a bevel on the sheets where the join so that they could overlap a bit and form a scarf joint Once sanded this will be a bit stronger and cleaner than a butt joint Start with th...

Страница 6: ...of laser cut 1 16ʺ ply 1 8ʺ lite ply 1 8ʺ balsa and 1 4ʺ balsa Each part has 3 holes laser cut through which motor mounting bolts will pass When gluing the parts together pay attention and make sure these holes are always aligned Also assemble the pieces so that the grain alternates for added strength Now I suggest you count count and recount how many layers of 1 4ʺ balsa it takes to make the cran...

Страница 7: ...inch 4 40 bolts that run through the crankcase and bolt into blind nuts in the firewall Small plywood laser cut spacers between the crankcase and the firewall not shown in photos set the down and right thrust Iʹm pretty sure the assembly is quite strong enough as it is But I think I will line each hole with a length of brass tube Iʹm afraid that I may get a bit ham fisted and over tighten the bolt...

Страница 8: ... blind nuts into place Iʹve started on the included dummy motor cylinders The crankcase has already been described earlier in this thread The cylinders are made up of a piece of 1 8ʺ sq balsa and some other laser cut balsa disks The disks are glued to the square piece and then the supplied pre printed card stock is wrapped around that assembly and glued in place Then the cylinder is glued to the c...

Страница 9: ...oes quite quickly too In case youʹre curious each cylinder took about 42ʺ of thread so thatʹs 9X42ʺ 31 5 feet total Luckily you can reuse the ʺspacerʺ thread if youʹre careful Put a small drop of thick CA on the cylinder Lay both threads in the glue and let harden Trim both ends of the threads Start wrapping the threads around the cylinder Make sure the threads stay parallel and do not cross each ...

Страница 10: ... wing mounting plate That is what holds the middle and top wings on This results in an invisible wing mounting system I think there will be enough room between the front of the cowl and the back of the prop so that you donʹt need to take the prop off every time you put the airplane together at the field Moving the cowl 1 4ʺ forward will be enough to release the wing The middle wing mounting plate ...

Страница 11: ...ymore There is not enough clearance between the front face of the cowl and the motor shaft to allow the cowl to go on and off So the designer and I scratched our heads about this for a while In the end we decided it would probably be best to have a slot in the lower cowl lip underneath the prop shaft hole To hide the hole I cut a wedge out of the cowl and used magnets to hold the wedge in place My...

Страница 12: ...g out Once the cowl is painted I think the part line will be very hard to see especially as the cowl will be black Just a couple of shots of the cowl and primer Picture 1 shows the cowl with 1 coat of primer applied I use Motomaster brand ʺPrimer Scratch Fillerʺ available at Canadian Tire If you arenʹt Canadian Canadian Tire is like a Menʹs dream department store with loads of cool guy stuff and e...

Страница 13: ...es The main spars are 3 16 X1 2 balsa The trailing edges are laser cut 1 32 ply with the TE scallops laser cut The distinctive Dr1 ʺSaw Toothʺ leading edge is laser cut from 1 32 ply There are laser cut 3 16ʺ pieces that go on top of the forward main spar between the ribs So when adding the ribs itʹs merely a process of working from one end to the other adding a block a rib a block etc The ply LE ...

Страница 14: ...se tubes Although Iʹm thinking of maybe using carbon fiber tubes to save some weight Middle wing is attached to mounting plate with 4 40 bolts and blind nuts installed in mid wing Tab at rear of mounting plate fits into slot in fuselage just forward of the cockpit Slot in rear of cowl goes over the tab at the front of the mid wing mounting plate Cowling is secured with 2 4 40 bolts and blind nuts ...

Страница 15: ...ap balsa from some of the laser cut part sheets that is perfect for the job To make sure everything will look good when Iʹm done I put the wing in position on the fuselage and put some plastic wrap between the fuselage and the back of the middle wing to make sure they didnʹt become permanently attached With some trial and error I cut a piece of balsa as wide as I could so that it would sit on top ...

Страница 16: ...ouch the iron to the assembly let it get good and hot and let the solder flow into the joint The final result is tough as nails I worked on the cabane struts this afternoon They are made from 3 32ʺ music wire The top wing is attached to the cabanes with 1 8ʺ nylon landing gear straps and 4 40 bolts The bottom of the front struts slide into a 1 8ʺOD piece of brass tubing that is built into the midd...

Страница 17: ...op wing in a rib also made out of 2 1 16ʺ ply and 1 1 32 ply pieces I must admit I cheated with the struts It is absolutely essential that all 4 pieces of the cabane struts be the correct length and have all the correct angles Because of this I felt I would have trouble making my bends accurately enough to do the job So after roughly bending and sizing each strut I cut it in half and then chopped ...

Страница 18: ...in place A thin bead of CA around the rim makes for a secure tire Paper cones are cut out Use a ball point pen to score each line on the back to make an impression of spokes It is helpful to do this operation on a paper tablet so that the pen makes a good crease Fold the paper along the crease lines to exaggerate the raised lines One of the sections forming a wedge is cut out Make cuts to the cent...

Страница 19: ...dered to the axle I then epoxied the tabs to the base The brass has just enough flex to allow a little wiggle I sheeted the top with 1 16ʺ balsa I also made the holes a little over sized in the top sheeting where the wire passes through If the sheeting is right up against the wire any wiggle will crack the sheeting WING SERVOS Hereʹs the aileron servo installation I chose the lazy man method and u...

Страница 20: ... edge should look great when the wings are covered and painted And hey the wingtips came out with minimal wrinkles I have started covering the fuselage I was worried about this as there are a few tricky areas namely the area between the lower wing root and the fuselage side It actually came out very well I think Iʹm starting to think I can make Polyspan do anything Just look at the sexy curves it ...

Страница 21: ...d around the wire strut This should make things pretty strong I am going to do the front fairing after the model is completed and the upper wing is joined to the middle wing I hate hate hate servo wires flopping in the breeze So my plan is to attach the wings to each other glued the balsa front fairings on then glue the servo wires along the inside of the fairing Then Iʹll wrap everything with Pol...

Страница 22: ...t balsa in the form of a side and front profile of a pilot The plan sheet says ʺʺGlue together fill with foam and paintʺ Heck if itʹs that easy I might as well give it a try Iʹm using blue foam as it seems to be much easier to carve with a hobby knife and sandpaper than white bead foam Once I get the pilot to shape Iʹll probably give him some sort of paper mache finish and then add details like bu...

Страница 23: ...d a fur collar for those cold missions over the front in pursuit of der Englander I used a pencil to mark out where I thought a fur collar would go Then I used a bead of spackle and a small spatula to get the shape I then used the end of a coarse bristled paint brush and stippled the spackle When itʹs dry and painted I think it will look good too I didnʹt think that Iʹd be putting this much work i...

Страница 24: ...ts The battery slides in through the forward most hatch and the top of the pack is retained by the ʺLʺ the shelf will also serve as a place to mount the ESC and RX The bottom of the battery rest on the forward landing gear mount I then glued a piece of 1 8ʺ basswood to the inside of the hatch Once the hatch is in place the basswood piece stops the battery from sliding backwards Itʹs simple and see...

Страница 25: ... 6 minutes so up we go again This time I advanced the power more rapidly and it leapt off the ground in no time and pointed her nose up and kept on climbing The next 2 landings ended in nose overs I landed too fast and when the triplane starts bouncing down the runway on the roll out it will eventually find the right bump that flips her on to the nose No damage at all thought The next 5 landings I...

Отзывы: