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HABICHT QUARTER SCALE**

Posted: 02 Dec 2020, 12:45
by chris williams
It was sometime back in the last century that my first 1/4 scale Habicht plan sprang into existence. I'd like to think I'd learnt a thing or two since then, but I could be wrong! That version featured the scale wing section, and although it flew reasonably well, this was before aerotow became popular, so it never really got the chance to build up speed from altitude. Since then, I've built a 3rd scale version with a Ritz wing section which I thought flew pretty well, but as my birth date continued to reverse into the mists of time, I thought something smaller might be appropriate. Encouraged by the rolling performance of both the 1/4 scale Petrel & Flamingo, I decided to use the same HQ section on the Habicht, and let the dice fall where they may...
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Re: HABICHT QUARTER SCALE

Posted: 02 Dec 2020, 15:20
by chris williams
Starting with the traditional fuselage half-shell...

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Re: HABICHT QUARTER SCALE

Posted: 02 Dec 2020, 21:53
by Jilles
I see you being from UK heritage the kettle for a cup of tea is not far away

Re: HABICHT QUARTER SCALE

Posted: 03 Dec 2020, 09:57
by chris williams
Trust me, Jilles, you wouldn't want a cuppa from that kettle...

Re: HABICHT QUARTER SCALE

Posted: 03 Dec 2020, 09:59
by chris williams
The formers are tied in place by glueing balsa strips between them, which also reinforces the keel for when the half-shell is removed from the board.
As ever, it's important to ensure that the keels are firmly pinned to the board throughout...
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Re: HABICHT QUARTER SCALE

Posted: 04 Dec 2020, 08:07
by chris williams
With enough planking added at the front, and the 5mm sq. balsa diagonals at the rear, the half-shell can be removed from the board....
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Re: HABICHT QUARTER SCALE

Posted: 04 Dec 2020, 20:42
by SedB
Nice to see that planking come along, it gives even more a feeling of something beautiful being created!
What I wonder, looking at the first pictures of this build is;
How did you (back then) paint the white and red-striped model? I assume this model was made before the existence of Ora-stick?
Is the whole model painted, or is part of the color scheme done with coloured shrink foil?

Daniel

Re: HABICHT QUARTER SCALE

Posted: 05 Dec 2020, 00:25
by chris williams
The 3rd scale version was covered entirely with Solartex and painted with 2-pack paint; this was around 2007...

Re: HABICHT QUARTER SCALE

Posted: 05 Dec 2020, 08:19
by chris williams
Now, work can start on the second side of the fuselage...
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Re: HABICHT QUARTER SCALE

Posted: 06 Dec 2020, 08:24
by chris williams
As the rear of the fuselage is made rigid with the diagonal balsa strip, a quick alignment check is in order...
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Re: HABICHT QUARTER SCALE

Posted: 07 Dec 2020, 10:12
by chris williams
Once the outside of the front of the fuselage has been filled and shaped, the temporary formers can be removed, and the interior glassed in the usual fashion...
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Re: HABICHT QUARTER SCALE

Posted: 08 Dec 2020, 12:20
by chris williams
Moving on now to the tailplane...
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Re: HABICHT QUARTER SCALE

Posted: 10 Dec 2020, 09:36
by chris williams
Once the false LE has been hinged to the tailplane, the construction of the elevator can commence...
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Re: HABICHT QUARTER SCALE

Posted: 11 Dec 2020, 08:15
by chris williams
The tailplane can now be mounted to the fuselage and the elevator connected to the servo...
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Re: HABICHT QUARTER SCALE

Posted: 12 Dec 2020, 10:03
by chris williams
Now the fin can be assembled...
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Re: HABICHT QUARTER SCALE

Posted: 13 Dec 2020, 08:25
by chris williams
Now for the rudder...
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Re: HABICHT QUARTER SCALE

Posted: 14 Dec 2020, 07:53
by chris williams
Time now to start sheeting the rear of the fuselage...
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Re: HABICHT QUARTER SCALE

Posted: 15 Dec 2020, 08:13
by chris williams
As usual, card templates make the job easier...
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Re: HABICHT QUARTER SCALE

Posted: 16 Dec 2020, 10:09
by chris williams
With the wing joiner box made up, it's time for an alignment check before glueing it in place...
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Re: HABICHT QUARTER SCALE

Posted: 17 Dec 2020, 10:19
by chris williams
Now the fuselage sheeting can be finalised...
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Re: HABICHT QUARTER SCALE

Posted: 18 Dec 2020, 09:59
by chris williams
Now for the top fairing...
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Re: HABICHT QUARTER SCALE

Posted: 19 Dec 2020, 14:36
by chris williams
Moving on to the canopy fairing...Twin strips of 3 x 6mm spruce are laminated together to follow the curve of the cockpit aperture
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Re: HABICHT QUARTER SCALE

Posted: 22 Dec 2020, 11:45
by chris williams
Finishing off the canopy aperture framework
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Re: HABICHT QUARTER SCALE

Posted: 22 Dec 2020, 21:39
by Dale Nicholls
Thats a great photo tutorial on a complex canopy section.
Each component is not complex in its own right, but together they are !
thanks for sharing that with the community Chris.

looking forward to seeing the finished model and the test flights.

Dale

Re: HABICHT QUARTER SCALE

Posted: 23 Dec 2020, 09:43
by chris williams
It's worth noting that it's much easier to ply sheet the canopy framework in two parts, with a join at the front/centre. (It only falls apart when there's a window in the middle!)
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Re: HABICHT QUARTER SCALE

Posted: 24 Dec 2020, 09:58
by chris williams
Once the framework is complete, it can be rendered flush with the fuselage with a dose of filler...(Always remembering to run the knife through the join before the filler completely hardens!)
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Re: HABICHT QUARTER SCALE

Posted: 26 Dec 2020, 09:45
by chris williams
With the wheel mount tidied up, the lower rear sheeting can be added, including the Bowden tube cable guides...
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Re: HABICHT QUARTER SCALE

Posted: 27 Dec 2020, 09:55
by chris williams
We can move on now to the wings...1st job is to make up the bent TE for the inner panel. This is 1.5mm spruce laminated over the jig support with 5mm balsa... Then the gull supports can be pinned to the board. Also, the wing joiner box components can be readied...
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Re: HABICHT QUARTER SCALE

Posted: 28 Dec 2020, 10:03
by chris williams
The basic wing structure can now be started...
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Re: HABICHT QUARTER SCALE

Posted: 29 Dec 2020, 10:01
by chris williams
With all the ply parts added to the basic structure, the wing will soon be ready for the wing joiner box etc...
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Re: HABICHT QUARTER SCALE

Posted: 30 Dec 2020, 09:31
by chris williams
Full disclosure...when I first rigged the basic wing panels to the fuselage, there was insufficient dihedral. As I had already epoxied the joiner boxes in place, I had to resort to bending the wing joiner blades. Although I'm pretty sure I modified the drawing, a dihedral check at this stage with the joiner boxes clamped in place is probably a good idea...
Note: With the correct dihedral, the lower surfaces of the outer wing panels should be in line with each other, thus giving the upper surfaces a slight anhedral...
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Re: HABICHT QUARTER SCALE

Posted: 31 Dec 2020, 09:50
by chris williams
With all the ply webbing finalised, the lower 1.5mm balsa sheeting can be added...
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Re: HABICHT QUARTER SCALE

Posted: 01 Jan 2021, 09:58
by chris williams
Once the sub spars have been added, the wing can be laid on its jig supports and the top sheeting can be added...
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Re: HABICHT QUARTER SCALE

Posted: 02 Jan 2021, 10:13
by chris williams
Now the rest of the top sheeting can be added, making sure at each stage the TE is clamped straight...
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Re: HABICHT QUARTER SCALE

Posted: 03 Jan 2021, 09:53
by chris williams
Now the wing roots can be finished off..
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Re: HABICHT QUARTER SCALE

Posted: 04 Jan 2021, 10:04
by chris williams
Now the wing roots can be lined with 0.8mm ply...
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Re: HABICHT QUARTER SCALE

Posted: 04 Jan 2021, 17:53
by chris williams
Adam, these days I prefer to use 0.6mm ply: lighter, easier to bend and still suitably strong...

Re: HABICHT QUARTER SCALE

Posted: 05 Jan 2021, 11:55
by chris williams
Time now for the spoilers...
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Re: HABICHT QUARTER SCALE

Posted: 05 Jan 2021, 16:57
by chris williams
PM your email address, Adam, and I'll send all the gubbins...

Re: HABICHT QUARTER SCALE

Posted: 06 Jan 2021, 09:32
by chris williams
For the sake of simplicity, the ailerons are top hinged, and built flat to the board...
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Re: HABICHT QUARTER SCALE

Posted: 06 Jan 2021, 12:20
by Martin Gough
Chris no wonder there is a balsa shortage with all the building your doing!
Regards Martin.

Re: HABICHT QUARTER SCALE

Posted: 06 Jan 2021, 17:12
by chris williams
8-) 8-) 8-) 8-) 8-) 8-)

Re: HABICHT QUARTER SCALE

Posted: 07 Jan 2021, 10:22
by chris williams
Obviously, setting the wings to the fuselage is quite important. I usually set one wing relative to the tailplane with the help of the incidence meter. Once satisfied with this, I prefer to set up the second wing with the Mk1 eyeball, as I find this to be more reliable than the meter. This is done by lifting the rear of the fuselage up until you can sight along the first wing so the under surface forms a straight line. Moving your head, look at the other wing and check that it looks exactly the same: if it does, then the wings are properly aligned with each other relative to their respective angle of attack...
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Re: HABICHT QUARTER SCALE

Posted: 08 Jan 2021, 10:16
by chris williams
Good old body filler sorts out the final shape & fit...
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Re: HABICHT QUARTER SCALE

Posted: 09 Jan 2021, 09:52
by chris williams
Now the rear end can be tidied up...
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Re: HABICHT QUARTER SCALE

Posted: 11 Jan 2021, 10:17
by chris williams
(Can't resist it!) Should have gone to Specsavers :D :D :D :roll:

Re: HABICHT QUARTER SCALE

Posted: 11 Jan 2021, 12:21
by chris williams
A few more details, including the mighty lump of lead that was required! (In retrospect, the Schweyer version with the shorter nose might not have been the best choice)
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Re: HABICHT QUARTER SCALE

Posted: 12 Jan 2021, 09:49
by chris williams
Now for some details of the fin fairing...
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Re: HABICHT QUARTER SCALE

Posted: 13 Jan 2021, 09:44
by chris williams
The airframe is now ready for the process of covering & painting...
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Re: HABICHT QUARTER SCALE

Posted: 13 Jan 2021, 11:58
by SedB
Looks stunning Chris! I hope you share some pics of the covering and painting process!!
Looking at the very small gap between the stabiliser and the elevator, I was wondering wether you used 'normal' pin type hinges, or are they temporarily fixed?

Dan

Re: HABICHT QUARTER SCALE

Posted: 14 Jan 2021, 10:00
by chris williams
The hinges are the usual Robart style pin hinges, which will be permanently fixed after the covering process..
My current preference for covering is to Solartex the fuselage and film the flying surfaces. (Strips of 'Tex ironed on in the appropriate places initially, will quite successfully simulate the joins in the plywood on the full-size) This helps preserve my stock of 'Tex, requires a lot less painting, is significantly cheaper, and a lot lighter, too. Concave and sharply curved convex areas are left open, with the edges of the 'Tex submerged under 2-pack primer. This is brushed on in six or seven coats. A light application of aerosol black will act as a guide coat, and the primer can be carefully taken down initially with 120 grit dry, on a block, followed by 320, which is fine enough to feather out the edges. From here I spray further 2 coats of primer over the whole of the fuselage, flatting down wet with 600 w & d paper. Then it's time to spray on the 2-pack top coat...
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Re: HABICHT QUARTER SCALE

Posted: 14 Jan 2021, 21:52
by SedB
Thanks a lot for the explanation Chris, it's really helpful!!

Dan

Re: HABICHT QUARTER SCALE

Posted: 15 Jan 2021, 09:47
by chris williams
The flying surfaces are covered initially with HK's matt clear film, and then the colour trims added. It's entirely possible to apply the clear in separate panels with a 25mm overlap, provided you don't over-shrink with too much heat, as the edges will pull away. (Don't ask!)
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Re: HABICHT QUARTER SCALE

Posted: 15 Jan 2021, 17:36
by SedB
That looks stunning!! I love it :D !!

Re: HABICHT QUARTER SCALE

Posted: 15 Jan 2021, 22:28
by Bovin
Very nice and an immaculate paintjob :D

Vincent

Re: HABICHT QUARTER SCALE

Posted: 15 Jan 2021, 23:32
by Ray Watts
Very nice Chris. So that was 6 weeks and 2 days. Christmas must have slowed you down a bit I guess 🤣🤣🤣

Re: HABICHT QUARTER SCALE

Posted: 16 Jan 2021, 10:02
by chris williams
Something needs to slow me down, Ray...Checking back, I've discovered that I've built seven models in just over 12 months. ;)

Re: HABICHT QUARTER SCALE

Posted: 16 Jan 2021, 10:15
by chris williams
STATS:

SCALE: 1/4
SPAN: 3.4m
WEIGHT: 15lbs
WING SECTION: HQ35/14-12
5-FUNCTION CONTROL FOR RUDDER, ELEVATOR, AILERONS, TOW RELEASE, SPOILERS

Deviations from scale: top-hinged ailerons, fuselage slightly thinned in width,
no elevator trim tab, non-scale wing section, no tailplane struts

I've not had that many opportunities to fly the Habicht, but here are my conclusions:

1: Perfectly safe at low speeds, as you would expect with this section

2: Capable of all the standard aerobatic manouvres, loops, rolls etc. (A bit untidy, but that's more than likely down to me!)

3: Capable of sustained inverted flight

The big lump of lead up front certainly goes a long way toward retaining energy during aerobatics. In common with every other Habicht I have built, you would need Big Lift on the slope, otherwise you will spend a lot of time trying to get some altitude before you can rapidly spend it. Aerotow is the better option, as you can start with plenty of height before hooning begins. Like it's bigger predecessor, such a flight will last 2 to 3 minutes.
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Re: HABICHT QUARTER SCALE

Posted: 16 Jan 2021, 10:23
by Mike F
Beautiful!

Re: HABICHT QUARTER SCALE

Posted: 19 Feb 2021, 11:32
by chris williams
Also, for those who enjoy Scroll Saw Therapy, the parts are available from me in PDF form, all ready to print out in an A4 printer. (Note: always check the printout outs against the plan)

Re: HABICHT QUARTER SCALE

Posted: 10 Apr 2021, 13:59
by John Fairbairn
Hi Chris, I have been a fan of your Habicht for quite a while now and got your plan and the Silent Flight mag December/January 1993 and started building. Due to circumstances the part build fuselage, wings and tail were put to one side. A few months back I was able to dive back in to the build. I had searched for information on on the build and eventually found the RC-Network.de forum and the 51 page thread on the Habicht. From there I was given the link to here. A convoluted route.

My plan shows the Frize ailerons and it is certainly making the hinging of them 'interesting. There are a lot of other differences between your 90s plan and the model you have shown us here. Can you tell me if it's the plan for a different mark Habicht?

I don't want to hijack your thread, but I have a load of photos I could post if you wish? Or would it be better for me to start a new 1/4 scale Habicht thread?

Re: HABICHT QUARTER SCALE

Posted: 10 Apr 2021, 17:50
by chris williams
Blimey John, a plan from the last century...! As I recall, the main difference is in the wing section, this old plan featuring that of the full size. I have experimented with different sections over the years on different Habichts, and come to the conclusion that, at these scales, you're never going to compete with the glass jobbies when it comes to hooning. The current version features simplified top-hinged ailerons, and the HQ 35 section. This has proven to be reasonably aerobatic and yet still super-safe at low speeds.
Post some pics by all means on this thread, or start a new one, it's up to you. I have scans of the original build article if you need them, but I imagine all the original pics have turned to dust by now...
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Re: HABICHT QUARTER SCALE

Posted: 10 Apr 2021, 23:19
by John Fairbairn
Thank you for your reply Chris. It's good to know that someone does know ALL about it. I actually have your original Silent flight in front of me now, but any information will be gratefully received.

I'm now a bit of a dab hand with 1/64th ply and even sorted out that it's 0.4mm for the German forum! When I started my build things like wing servos were not around, so I have my aileron servos in the wing root with hollow snake inners in place for closed loop runs, but I think that I may run them to an arm by the surface and use the arm to connect to the control surface by push rod. It would be quite short and all the weight would be inboard.
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The lower rear 1/32nd ply sheet for the stbd side is shown below. It took a load of lakky bands and some lengths from a dead saw band from my band saw to get it glued in place, but it worked well.
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I did the tail plane in 2 halves so that it's very easy to remove for transport and it is mounted on 1/8th ply tongues
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The wings arre very much as per the plan, but with open rather than solid tips. The trailing edge for the ailerons and the aileron leading edges in 1/64th ply were fun, but not too bad after the ply had been wet and tightly wrapped onto a broom handle! They even finished up straight!
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I'll leave it at that for the moment before I fall asleep!

Before I forget. Any information on control throws for the ailerons and elevator would be gratefully received, as you said

"The first thing that you will notice is a razor sharp response to the aileron control" and later is the write up "The elevator as set up on the plan is fairly lively"! :shock:

Re: HABICHT QUARTER SCALE

Posted: 11 Apr 2021, 11:38
by John Fairbairn
I have to admit that I struggled to find a way to align the wing roots at first until I had the idea of mounting the wings on the roots. I have use the Multiplex MULTIlock Uni-Set to secure them, 2 in each side. Then mounting the wings on to the fuz, carefully measuring the distance from each wing tip to tail and cyano the roots to the fuz. Once that was cured properly I held it more solidly with Zpoxy with microfibre glass mixed in. That way I was pretty sure that the wings were aligned correctly.
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I am sorry if this is jumping about a bit.

Edit. : - It's quite strange the way that the text is showing up alongside the photos? If I look at the post on 'Preview' it all looks as it should do, but then when I post it it changes?

Edit 2 : - I think I have cracked the text problem. I had only left a single line space under the photos, but tried 2 line spaces and it puts the text where it should be, I hope :mrgreen:

Re: HABICHT QUARTER SCALE

Posted: 11 Apr 2021, 12:35
by Peter Balcombe
Looks good John.
Another solution to photos is not to click the ‘inline’ box, which will then add all photos in a group below all of the text. You can add a meaningful title to each photo if you like in the adjacent text box.

I tend to add photos one at a time, then you know which one had an issue loading ;)
Peter

Re: HABICHT QUARTER SCALE

Posted: 11 Apr 2021, 13:44
by chris williams
John, I'm a little concerned about the split tailplane. Is there more than one ply plate holding them together...?

Re: HABICHT QUARTER SCALE

Posted: 11 Apr 2021, 14:14
by John Fairbairn
No, there is the 1/8th ply sheet straight through the tail housing, but I will be fitting the bracing struts and there will be a fixing through the ply to stop the tail halves from moving. So I don't think there will be a structural problem? The ply into the halves is 1 1/2" square so it should give a good solid fixing. I have to admit that that ply looks smaller on the photo above than it actually is.

I used the square drive for the elevators on my Fougar Magister and it works really well and positive.

Re: HABICHT QUARTER SCALE

Posted: 11 Apr 2021, 15:17
by chris williams
Ah yes, the struts should sort it...

Re: HABICHT QUARTER SCALE

Posted: 11 Apr 2021, 17:41
by John Fairbairn
If you really want to see something hairy Chris you should see the wing fixing on my 1.5th scale Crick Grunau Baby! The struts on there are everything.

The wing joiners are 2 1/16th (if I remember correctly) wires, the wings are held together with 2 split pins in each wing root that overlap and a wooden pin is inserted in each overlapping pair to stop the wings sliding of the wires. If there's a heavy landing the wing tips tend to finish up touching the ground!
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The full size was once described to me as like flying whilst sitting on the top of a big ball bearing. You could slide off any way at any time! Sounds a bit like my model? Lovely in the air though.

I have just been painting the Habicht driver. It's the first time I have ever done anything like it and the eyes have it, as they say somewhere in London? Even after a lot of watching youtube on how they still don't look quite right, but not too bad I suppose/ Just the shirt to do, but I haven't decided on the colour yet?
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Re: HABICHT QUARTER SCALE

Posted: 11 Apr 2021, 20:28
by chris williams
I managed to dig out some old pics of the prototype.... (Fairly recent, actually...only 19 years old)
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Re: HABICHT QUARTER SCALE

Posted: 27 Apr 2021, 13:39
by John Fairbairn
That looks like a rather nice paint jpb there Chris. I will be doing mine in the red sunburst, I hope.

At the moment it's progressing slowly as a short while back I managed to screw up my left shoulder and couldn't do much, but it's a lot better now and I'm trying to work things out. I decided to go off plan and cut the ailerons about 1/3rd 2/3rds with the inner 1/3rd to be a flap/aileron. All I have to do now is to work out how to program that into my Tranis Tx. If anyone has any ideas as to how to do this I would be very pleased to here it.

What I want to do is to be able to use both inner and outer sections as ailerons and the inner as flaps. The reason being is all that I have read about the spoilers not being very effective.

Re: HABICHT QUARTER SCALE

Posted: 27 Apr 2021, 15:35
by mjcp
John Fairbairn wrote: 27 Apr 2021, 13:39
All I have to do now is to work out how to program that into my Tranis Tx. If anyone has any ideas as to how to do this I would be very pleased to here it.

What I want to do is to be able to use both inner and outer sections as ailerons and the inner as flaps. The reason being is all that I have read about the spoilers not being very effective.
You might have some luck with the excellent templates from Mike Shellim.

The F3F one is the "go to" for my full house gliders, I just ignore the bits that are not relevant or adapt e.g. spoilers but no flaps? Set the spoilers for "crow" in landing mode, but not for thermic/climb modes etc.

Where you may "come undone" is if you have both Flaps and spoilers, but if you say the spoilers are a bit "meh", ignore them and use crow.

n.b. all this assumes you are OpenTx, not OEM Taranis!

https://rc-soar.com/opentx/setups/f3f/index.htm

M

Re: HABICHT QUARTER SCALE

Posted: 27 Apr 2021, 15:38
by Peter Balcombe
John Fairbairn wrote: 27 Apr 2021, 13:39 All I have to do now is to work out how to program that into my Tranis Tx. If anyone has any ideas as to how to do this I would be very pleased to here it.
John,
If you have the OpenTx OS on your Taranis then mixing anything with anything is possible. Essentially, if you can think of something, you can probably do it :)
Not sure what is possible on the default system as I changed my Tx to OpenTx pretty quick!
Peter

Re: HABICHT QUARTER SCALE

Posted: 27 Apr 2021, 17:02
by chris williams
John, the combination of spoilers and up-going ailerons are usually very effective...

Re: HABICHT QUARTER SCALE

Posted: 27 Apr 2021, 18:53
by John Fairbairn
Thank you Mark. I will look at the link very soon.

I had meant to say that my tranny is on the Open Tx OS and I had realised that anything is possible, but it's the how that leaves me behind at times. I now have the wings fully operative, ailerons, flaps and spoilers and I think that I may even be on the right track for the flap/aileron mix?

I'll give it some more time tomorrow as my beer is going to get cold :shock: :shock:

That sounds promising Chris. I have used that on my Discus2 plastic thing. It certainly slows it down and makes things less 'interesting'! So with flaps as well ???

Re: HABICHT QUARTER SCALE

Posted: 11 May 2021, 09:29
by John Fairbairn
I remembered to get a couple of photos of the flap arrangement today and I think that it should be quite effective.

Also, I managed to get 10 sheets of good quality 1/16th balsa on Saturday and have almost finished sheeting the underside of the Stbd wing. As the spoiler and flap servos are so close together I have put them under the same access hatch as I thought that it would look a real mess if they had separate hatches. It seems to have worked well and I used 1/16th ply for that
IMG_5263.JPG
IMG_5262.JPG

I thought of a simple servo mount. I glued a piece of 1 1/6th ply to the rib with a cutout for the servo and 4 servo mount screws, with the heads cut
Hab servo mount 1.jpeg

The servo is held on the stumps with 2 bent wire clips

Hab servo mount 2.jpeg

And it is a solid as a rock. I don't know if this method has been used before, but I have used it a couple of times and it's very secure.

Hab servo mount .jpeg

Re: HABICHT QUARTER SCALE**

Posted: 08 Sep 2021, 09:47
by chris williams
It would seem that taking a punt on using my favourite wing section on the Habicht worked out reasonably well. She's aerobatic, at least within my limited capabilities, will fly inverted, and is ultra-safe at low speed... I'll let the video do the talking: