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Old 11-21-2012, 07:31 AM   #1
baz49exe
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Default Keil Kraft Skystreak 26 foam build

Way back in 1960 when I was 11 years old I built my first model plane. After much searching I chose to buy a Keil Kraft SkyStreak 26 control line stunter kit which gave me many first time building issues.
To cut a long story short, I started the ED Bee 1cc diesel and with an expert flying it, it performed less than one lap of the circle before it disintegrated before my eyes.
Turned out that I should have used something called shrinking dope to reinforce the balsa and tissue covering and not just the coloured variety which I had applied to match the amazing picture on the box.
My next model was the KK Champ with a solid balsa wing which taught me to fly and survived many happy hours of control line flying.
Forward to a few weeks ago and while searching through Outerzone plans site there was a copy of the original plan for the SkyStreak.
I was immediately transported back half a century and a plan sprung to life. (I just had to have a go at building some of these early control line stunters as RC foamies and see if I can get them to fly.)
Stick the plan into Adobe Reader X, print and tile it to 36" span and use the outline and former shapes, to build it in foam for electric RC.
Looking at the plan view the fuz is flat sided with a flat bottom and a curved planked turtle deck top. I figured that this would be perfect for a sheet foam sidewall, bottom and top build.
A search through the squirreled foam in the basement found some flat television packaging foam with right angled protrusions moulded onto it,
( pic1) perfect for the fuselage.
The outline was cut form the plan and used to cut left and right sides which were then placed over the fuz plan view and the protrusions trimmed until it matched the plan view profile. It was then gorilla glued together.
( pic 2)
Next the wing cores need to be cut from 2 inch thick foam board.


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Old 11-21-2012, 09:17 AM   #2
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Best of luck with the build. Keep us updated.

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Old 11-21-2012, 12:28 PM   #3
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Old 11-21-2012, 12:57 PM   #4
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Recycling of the highest order..
The airplane will be better than the packing material ever was.
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Old 11-21-2012, 01:45 PM   #5
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Thanks very much guys. This is a real experiment and I'm going to try to do things differently to make it as simple as possible as I go.
So far the fuz is rubbish and hopefully most of the rest of the model will be too.
I've cut out the wing plan , drawn the outline onto the foam board and cut the blanks.( pics attached)
This time I'm going to use stiff cardboard for the wing hot wire profile cutting templates as they are far easier to make than those cut from hardboard which require a jigsaw to cut them out. All I need this time is a pair of scissors.


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Old 11-21-2012, 03:45 PM   #6
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Hi Mate ...... funny you being on Outerzone .... I've got a few gems of there last few days ....

KK ... I had the Radian .....

There's one plan I'm still looking for ... Veron Sopwith 1 1/2 Strutter .... 3ch RC job ..... I had one and converted to 4ch ... back in 80's.

Nigel

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Old 11-21-2012, 04:30 PM   #7
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Hi Nigel, it's a great resource isn't it. In the early 60's I had the Phantom, Marquis and the Champ as well and the plans are all on there. It would be good to build them for RC this time around.
I'm enjoying your Lanc build. A great idea, especially as the aircraft has direct links to your mother.

Barry
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Old 11-23-2012, 11:45 AM   #8
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Luckily the cardboard wing profile hot wire templates work well so that saved a great deal of time cutting and sanding board ones.
The two halves were joined with gorilla glue ( my new favourite modelling tool) and the full length ailerons were cut away from the wing. These are too thin to use anyway and will be added in balsa.
A full length balsa sub spar was glued to the rear of the wing to take the aileron hinges and provide a firm fixing edge.
The wing bottom was grooved to take a tapered spruce spar shaped from 12mm by 4mm strip bought at the local DIY store.
Again this was gorilla glued into place and left to dry.
The whole assembly was sanded and given a coat of spackle which was then sanded again, when dry.
Now I could test fit the fuselage to the wing.
To make things really simple I've decide to make this a one piece model. No wing fixing to worry about and the whole fuselage top as far back as the rear of the cockpit will become a removable hatch for gear access.
Just need to silk and varnish the wing now and then I can glue the fuselage and wing together.


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Old 11-23-2012, 03:38 PM   #9
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Originally Posted by baz49exe View Post
Hi Nigel, it's a great resource isn't it. In the early 60's I had the Phantom, Marquis and the Champ as well and the plans are all on there. It would be good to build them for RC this time around.
I'm enjoying your Lanc build. A great idea, especially as the aircraft has direct links to your mother.

Barry
Certainly is ...

Lancs on a suspension at moment .... I'm very ill and waiting MRI at hospital ... plus on top I have Flu ! I went flying today - got so fed up indoors I braved it ... paid a price when I got back home though ...

I'm just fiddling with stuff .. the twin Parkjet was easy - but has proved to be unworkable with the high power motors ....

I'll keep admiring what you do !!

Cheers
Nigel

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Old 11-23-2012, 05:37 PM   #10
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Nigel,
I'm so sorry to hear you are unwell. Here's hoping you make a swift recovery. Stay in the warm and build when you feel like.

Barry
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Old 11-26-2012, 10:25 AM   #11
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Household Christmas preparations have really eaten into building opportunities but I have managed to cover the wing with 5 momme silk and varnish. Likewise the fuselage which has now been glued into place as well. ( pic 1)
The removable fuselage hatch has been marked out and cut away to give total access to the battery and servo/ receiver bays. (pic 2)
Having looked at the possibilities I've decided to go with dual aileron servos mounted flat to the wing in the left and right fuselage walls with the control arms on the outside of the fuselage perpendicular to the wing.
This will be the simplest set up and very easy to adjust or repair.
When it came to sourcing material for the ailerons and tailplane set ups I discovered that my local model shop ( really a model railway supplier)
no longer stocks balsa " as nobody buys it" so I'm stuck with looking at experimenting with 3mm depron pizza trays or driving to the city for balsa.
In keeping with the scrap theme of the build I think that I should go for the recycled trays and see what happens.


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Old 11-27-2012, 12:15 PM   #12
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Making progress now.
Yesterday I cut a template of the fuselage firewall from a scrap plastic container and hot glued it to a block of lightweight cement wall block cut to the correct length of the nose section. A glow spinner was hot glued onto the front face of the block and the plug was carved to shape using a junior hack saw as a shaping tool. It was given some filler and left overnight.
This morning after some sanding it was placed into the neck of a pop bottle, which had been cut into two, with the spinner located firmly into the neck opening and heat shrunk with a heat gun.
The finished front cowl was knocked off the mould by hitting a rod through the bottle neck and onto the spinner top.
Being clear plastic this will now make it easy to see the motor and ESC inside the cowl, making it very simple to set up the motor mount and position the ESC within the cowl .


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Old 11-28-2012, 12:26 PM   #13
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Added the 10mm square stick mount today and used the same material for the cowl supports. Three servo screws in the ends of the supports will hold the cowl in place.
The motor fits snugly in the spinner section of the cowl with plenty of room to mount the ESC behind ( thank goodness) and a large air flow duct at the lower rear of the housing to provide plenty of cooling for both.


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Old 12-03-2012, 05:33 PM   #14
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I'm stuck waiting for the sheet balsa to arrive in the post for the elevator and ailerons so I used some time to cut the slot for the tail plane and glued it into place and when that was dry I cut a similar slot for the tail fin and fixed it into place as well.
I used 3mm pizza tray for both and laminated two sheets together with gorilla glue for the tailplane. The last of my balsa was added as an elevator mount and mini spar to the tailplane. The much firmer 3mm thick black pizza tray depron seemed substantial enough for the fin which was enlarged to almost twice the size of the original. I guess it didn't need much fin when it was controlled by the lines but it looked way too small for an RC model.
The elevator servo fits into a pocket in front of the fin and the wires are channelled through the fuselage to the radio bay.
When I turned to making the canopy I was relieved to find that the front section of the observers canopy on the Wellesley was an almost perfect match for the profile for the Skystreak cockpit and I had some test ones I'd shrunk before so it was dead easy to trim one of those to fit. The more moulds you make it seems that they eventually start to double up for other models with very small adjustments.
AUW at the moment is 7.75ozs
It is starting to look like my original of 50 years ago now. I can't wait for that balsa to arrive then I can test fly it.


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Old 12-04-2012, 10:40 AM   #15
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You're doing a great job once again there Barry; especially out of leftover household packing foam. By the look of things you'll have a pretty good stunt plane that will bring back wonderfull memories of long ago. Don't suppose you could post a link to the supplier of that 5 momme silk could you? I know I asked about it long ago, but I lost the email when my previous computor died. I'm looking at covering the Harrier with it, and experimenting with the RAF camo using an airbrush. I'll keep an eye on this project though; hopefully the balsa will get there soon, cheers
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Old 12-04-2012, 01:02 PM   #16
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Here's the link for silk.
http://www.dharmatrading.com/html/eng/3374-AA.shtml
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Old 12-05-2012, 07:39 AM   #17
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Paul, thanks for posting the link to Dharma trading. That is exactly where I bought my silk back in July 2010. I've just checked and I had 9 yards of 36"wide 5 momme shipped to the UK for $24-85 back then. great value!
I've since used it to cover three 60" plus span models, two 42" to 48" models and two 36" span models. That's a load of covering for the money and I've still got quite a bit left on the roll.

Michael, you won't be disappointed if you use it on the Harrier. I covered my GWS P-51 after having flown it in bare foam for a few years. I took the opportunity to upgrade the motor and the airframe is really far more resilient with the silk in place. It doesn't add a great deal of weight either and it makes adding a colour scheme so easy.
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Old 12-09-2012, 03:49 PM   #18
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The Skystreak as it now is ready for the test flight. I'm not going to do any more to it until I see if it actually will fly.
In the end I decided to use the hatch fixing method which worked on the Wellesley build. The top hatch slides into the rear of the cowl and when it is slide rearwards slightly a peg locates into the hole at the rear of the cockpit.
The set up of the aileron servo is totally new for me as I've always used torque rods for a single fuselage mounted aileron servo before but this operates smoothly with little or no play..
I've kept the gap on the bottom of the fuselage at the rear of the wing as it will provide though air flow and a clear air space for the aerial.
I only hope now that it has aileron authority and I'll discover that at the first hand launch. I hope it goes better than my first did in 1960.
It really should go in fact as the AUW with a 1000 3c lipo is 13.5ozs
With 138 watts available as the low power setup that gives 163.5 watts per lb which should be plenty but if I fit the 200 watt setup that gives 237 watts per lb which is more than enough.


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Old 12-09-2012, 10:43 PM   #19
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Barry

Looking Very nice.

Good luck on the maiden.

Regards
Jimmy
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Old 12-09-2012, 11:01 PM   #20
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Looks amazing from something made from old packing. I'm sure it will fly very well. Here's hoping your weather plays the game
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Old 12-09-2012, 11:21 PM   #21
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Looks like you've got it sculpted very straight, smooth, and true.
With the nice surface you have, one of these days I'll have to talk you into trying my favorite Coverite Microlite, made in your own homeland. Obviously it doesn't look as good as your paper or fabric covering jobs, but really light. I think you'll have an insane amount of power with this one also.
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Old 12-10-2012, 10:14 AM   #22
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Jimmy, thanks very much, hope you are all well there.
I will indeed need luck as it is after all a control line model with flat wings .

Micheal, the weather has turned bright and cold so tomorrow may well be a flying day and I can try it out. I really hope so. Whether it will actually fly or not it's been great to see the shape of my very first plane in solid form again. If it doesn't I'll just hang it in the workroom but to see it fly well would be great!!

Thanks Bill, I need to check out Microlite. Is it as strong as silk? I need the strength of the silk to support the foam as it gives the structure to the whole frame really.
I don't really like a lot of power. It's just a bonus in this case.
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Old 12-10-2012, 12:30 PM   #23
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Originally Posted by baz49exe View Post
Jimmy, thanks very much, hope you are all well there.
I will indeed need luck as it is after all a control line model with flat wings .

Micheal, the weather has turned bright and cold so tomorrow may well be a flying day and I can try it out. I really hope so. Whether it will actually fly or not it's been great to see the shape of my very first plane in solid form again. If it doesn't I'll just hang it in the workroom but to see it fly well would be great!!

Thanks Bill, I need to check out Microlite. Is it as strong as silk? I need the strength of the silk to support the foam as it gives the structure to the whole frame really.
I don't really like a lot of power. It's just a bonus in this case.
The silk would probably be far stronger, although the Microlite provides a lot of stiffening. I imagine one benefit of silk or glass is that you don't need the CF reinforcement that would otherwise have to be used though, so I imagine there's some trade off there.
Nice and warm here today, although pouring rain for the past few days. Supposedly snow tomorrow, which would probably be better. You gotta love flying in a fresh, heavy snow, where you get great bad landing insurance.
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Old 12-10-2012, 02:15 PM   #24
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Originally Posted by Bill G View Post
The silk would probably be far stronger, although the Microlite provides a lot of stiffening. I imagine one benefit of silk or glass is that you don't need the CF reinforcement that would otherwise have to be used though, so I imagine there's some trade off there.
Nice and warm here today, although pouring rain for the past few days. Supposedly snow tomorrow, which would probably be better. You gotta love flying in a fresh, heavy snow, where you get great bad landing insurance.
Bill, it is that strong and makes it possible for me to use the very poor quality EPS foam which is so readily and cheaply available over here. The "cooler type" packaging foam which I have just used for the fuselage is better quality and cuts far better though. Depron is just amazing though and it's free if you buy enough frozen pizzas. LOL
I have considered CF reinforcement as it's cutting edge but I'm sticking with good old spruce at the moment as it's cheap, readily available and I can carve and shape it to pattern with a basic knife.
It's bright and sunny here this morning and 1 degree C. Last time I flew in snow was as a kid in the 60's when we put skies onto our control line models. I don't think it went very well as the snow didn't really last long enough but it would be really good to try that again with RC this time if we get any significant snowfall this year.
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Old 12-11-2012, 03:55 PM   #25
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Fantastic morning, blue skies, still air and 1 degree celcius air temp.
Decided to maiden the Skystreak as the conditions were perfect. I was very concerned about the flat wing, short fuselage and the fact that it was designed to fly around on lines in the first place.
No need to have worried. It went straight away from the hand launch with no adjustment needed to the ailerons at all and a couple of clicks of up elevator trim to have her flying level.
I am really shocked at how well this design has transferred from control line to RC flight. It is as smooth as silk and feels like it's on rails.
I think I need to look at those early control line stunters in a new light now!!!
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