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scratch built micro Dr.1 - Richtofen's No. 152/17

Old 01-08-2012, 05:59 PM
  #1  
dcwwcp
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Default scratch built micro Dr.1 - Richtofen's No. 152/17

this is my latest print directly to foam micro build. I'm posting it here because I think there will be more interest in WWI aspect of it. it is built to 1/20 scale and the dimensions were kept as close as possible to the real aircraft. short nose, small rudder and all!

wingspan: 14.1"
weight: 35g with 160mah battery
ar6400 brick, as2000 aileron servo, and 8.5mm micro mustang gearbox and motor.

starts with some new development. I'm using the 1mm pro-formance greatplanes foam. it is about 40% lighter in density. it is equally as more flexible so I was concerned a bit about strength but it does really well.

I used it exactly like the 1mm RCfoam.com material. this same process described here:http://www.wattflyer.com/forums/show...934#post851934

I've also switched to Beacon's foam-tac glue. it is truly fantastic. quick grab and strong bond. clear and flexible. it's similar to using welder's on epp foam.

the wings are heat molded to get the heavy curve and end up undercambered and creat alot of lift.

the aileron control is an AS2000 servo with push wire and tube made from a .010" guitar string and 3/64 clear shrink tube shrunk down to .015". it uses 8mm plantraco fiberglass control horns.the total weight of this is only 2 grams with the servo! however, in retrospect, I would shrink the tubing down to 012" or 013" next time and use powdered teflon inside for lubrication.

the spandaus are my new design 1/20 scale barrel shrouds made from black paper and cut on a cnc cutter. the rest is just deporn foam, a .020" CF rod in the middle, and 4lb fireline used to make the gunsights.

the cowl is a fairly lazy development, I would love to say I vaccum formed it, but the truth is it's a glad 4oz. round container bottom. it's cut to shape, and painted with a mix of a tiny bit of green,zinc chromate yellow, and mostly italian red. this mix gave me the "green cowl over-painted red" look I wanted.
It is held on with magnets and has thin nylon tabs holding it in around the edges.

As you can see, the internals are stacked. I was worried that this would be a really tail heavy plane if I didn't stack the motor reciever and battery tight and all the way forward. but as it turns out, it is a little nose heavy and balances at approx. 20% back from the LE of the top wing. this makes it fly too quick for my liking, so I'm going to redo the battery holder and push the battery back until it can balance at 30% back o the top wing, and see how she behaves.

the LG is a new design that is a bit heavier but stronger and removable.
it uses a sandwich of 1/64 ply to make a slot in the bottom of the fuselage much like an eflite slow flyer is designed. the back struts of the landing gear are just bent wire. there is a piece of .020" ID tubing glued in
under the lower wing inside the fuse that the wire pushes into on each side about a 1/4". this makes for a stronger design, and still pretty light.

the wheels are made different from in the past also. they have a center disc of 1/64 aircraft ply, a wheel made from 2mm polyurethane foam, and printed paper on each side, with the outer one being coned to get the desired look.

that's most of it, I flew it last night at my indoor fly club and it was nose heavy. but that should be a fairly easy fix on a Dr.1
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Old 01-09-2012, 02:47 AM
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trumps1
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That is great, I can't believe what a fantastic looking model you can produce using that construction method! I will have to have a crack at it oneday!

Cheers for sharing
Craig
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Old 01-09-2012, 04:38 AM
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barmonkey
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That is just too cool!
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Old 01-09-2012, 05:23 AM
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Very nice! My second scratch build is a triplane and it's makin' me think I shoulda chosen something with fewer wings.

Yours looks very nice and authentic.
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Old 01-09-2012, 06:02 PM
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7car7
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Great great work!

Can you elaborate a bit on how the heat formed wings are made?
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Old 01-14-2012, 03:26 AM
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dcwwcp
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yeah sorry, I've been out of town.

it's a fairly simple process that I use.

first I make a balsa wing form. it's a piece of 1/4" to 3/8" thick 3" wide board about 18" long. I sand it like it's going to be a wing shape.

I use a 18" wide cookie sheet in the oven. I use a gas oven. It actually provides nice steady temperatures. I Preheat the oven to 170` F.

I take the printed and cut out wing and wrap it in a layer of tissue to protect it. I put a strip of tape along the leading edge to help it keep a smooth edge. then I align the leading edge of the wing on the curved leading edge of the balsa form. I start in the middle and use blue masking tape(because it does not gum up or deform in the heat) taking a strip of the tape long enough to wrap over the center of the chord and around to the bottom of the form and overlap a bit so it can stick to itself on the bottom of the form. The tape holds it tight to the shape of the balsa form.

I overlap the first piece about 1/3 with the next piece and go a few pieces in each direction and check the leading edge alignment to make sure it's not crooked.

once I'm done applying the tape, I put it on the cookie sheet and put it in the oven for 20 minutes at the preheated 170`F

when it comes out I let it cool completely before carefully removing the tape. the tissue sticks to the tape and not the wing.

that's it. heat formed foam becomes stiffer and doesn't need as much reinforcement.

~don
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Old 01-15-2012, 02:28 PM
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CarreraGTSCS
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Do your wheels rotate individually or are they fixed to the axle? It looks like you use an axle tube with an axle inside. Pretty slick bungee method by the way. Orthodontic rubber bands?

It never occurred to me to forgo a firewall and make a radio tray that goes all the way forward. Very smart.

Mike
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Old 01-15-2012, 03:48 PM
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dcwwcp
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yes you are correct on the landing gear.
5/16" OD ortho rubber bands. the axle tubeis a piece of .078" OD CF tube with about a .028" ID in it. I used a piece of .025" wire for the axle and the wheels also rotate freely.
if you don't let the wheels rotate freely, it won't steer very well on the ground, kinda like taking a sharp turn with 4 wheel drive locked in on the old truck!

yeah it's hard to keep the body shaped round right at the firewall cross-section, with out a firewall. But, you gotta keep the wieght forward.
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Old 01-15-2012, 04:09 PM
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CarreraGTSCS
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I tried maidening my scratch D VIII at an indoor meet yesterday but couldn't keep her on a straight enough line for her to take off. Kept ground looping. Too much play in the wheels made them wobbly. I like your design.

What program do you use to create your colors/graphics for printing to the foam? I like how subdued it came out. Even though in real life the colors were possibly more vivid we are used to seeing images of these aircraft in B/W orthochromatic so bright paints make our models look toy-like. Yours is just right.

Mike
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Old 01-16-2012, 01:00 AM
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one thing you can try to get the plane up is get that tail off the ground.

I quickly ramp the throttle up to flight level to get the tail off the ground. then the rudder can do it's job.

all my planes are tail draggers. that method works with all of my planes.

the graphics are highly modified card model graphics. I don't make them, I manipulate them for my purpose.

people forget warbirds are not shiny. not then, not now. the germans were running out of resources and paint was one of them. by 1918 the paint used to personalize aircraft was thin and it was being applied over other colors. the cowl I made represents this. historians will tell you, even the baron's DR.1 that was all red, was dark dull red.
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Old 03-01-2012, 08:12 PM
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floss
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Nice work! Cool to pop in here and see how your technique has evolved from the SS DIII to this!
Would like to see a step by step build next time dcwwcp, that would be fun and interesting to follow.

Cheers
Steve
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Old 03-08-2012, 10:26 PM
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thank you. I've been keeping in mind what you told me back then, push everything forward and keep the weight down.

I'm actually building an all foam 1/10 scale albatros D.V.

not the print-to-foam technique, but I will be printing lozenge pattern onto tissue.

maybe I should do a thread on the albatros?

~dcwwcp
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Old 03-10-2012, 02:40 AM
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I think you have too now you've told us about it

I am interested already about how you will get that torpedo shape correct with foam.

I will build a new project soon also, a Hannover CLIII.

Show us any work so far on the Albe DV dcwwcp, always interested to see what tricks you have up your sleeve

Steve
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Old 03-10-2012, 03:45 AM
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degreen60
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Originally Posted by floss View Post
I am interested already about how you will get that torpedo shape correct with foam.
Steve
You mean this shape? This is the foam fuselage for my scratch build Bristol M1C.
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Old 03-10-2012, 07:01 AM
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I remember that now, does it have a structure underneath? I have an Albatros DIII - ws 38inch, it didn't like the all foam fuse that I built originally. I had to put ply in the frame to stop flexing on the second attempt

Is the Bristol smaller?
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Old 03-10-2012, 11:20 AM
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The Bristol will have a 40inch wing span. It has 2 foam formers in the fuselage to help keep the front round.
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Old 03-10-2012, 08:40 PM
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Nice build subject, a cool looking monoplane. I had fun building all-foam planes of this size but there is a downside, they are so prone to a crack through the fuse just from a less than perfect landing let alone a crash because of a lack of stiffness.

I learnt a lot from the 2 planes pictured. In the Hannover the blue foam was solid......acted like a spine and the fuse on this plane was tougher for hard landings occasionally.

The DVIII was different the blue foam was much thinner from the start - this plane could crack in the middle with a rough arrival. Stringers are my friend now, will incorporate some sort of frame in all foam builds over about 30in ws.

Part of the fun and we all have different build methods, thats what makes this so interesting besides the obvious stuff ........ flying cool looking WW1 birds
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Old 03-17-2012, 04:43 AM
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dcwwcp
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well here is some video of the little Dr.1 finally.
not produced, just raw video.

[media]http://www.youtube.com/watch?v=iQyTBmRlWZg&list=UUagnQS_bP-wxfUoxAd20WkA&index=2&feature=plcp[/media]
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Old 04-13-2012, 02:35 AM
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scalercflyer
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Default A superb job

Once again a superb job DC! I love it. Looks like she is well behaved. Marty
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