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Author Topic: The Chzec aproach: TA 152 H plan by Petr Kholar rubber powered 1/20 scale  (Read 719 times)
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marcelop
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« on: November 02, 2018, 07:23:55 PM »

Hi all!
After a long time, I return to the construction of model airplanes.
This time it is the TA 152 H, plane supplied by Petr Kholar, a beautiful but very complicated model to build.
Not having available carbon fiber rods, I joined several carbon strands that Steve Fauble sent me some time ago, I used cyano to stick it on a 1mm raft board, then with another board, stuck on it I made a sandwitch, and "voila "Insert inside the balsa spar, I got a carbon fiber rod.
The rest of the construction is, as always, using wood for indoor, very light and use cyano glue.
stabilizer and rudder: 1gr.
It is very light
Attached files Thumbnail(s):
The Chzec aproach: TA 152 H plan by Petr Kholar rubber powered 1/20 scale
The Chzec aproach: TA 152 H plan by Petr Kholar rubber powered 1/20 scale
The Chzec aproach: TA 152 H plan by Petr Kholar rubber powered 1/20 scale
The Chzec aproach: TA 152 H plan by Petr Kholar rubber powered 1/20 scale
The Chzec aproach: TA 152 H plan by Petr Kholar rubber powered 1/20 scale
The Chzec aproach: TA 152 H plan by Petr Kholar rubber powered 1/20 scale
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marcelop
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« Reply #1 on: November 02, 2018, 07:27:19 PM »

sevaral small pieces make me crazy!!!! but i like it!!!i build the stabilizer and rudder in rectangle pieces the i sand tho the shape !!!
Attached files Thumbnail(s):
Re: The Chzec aproach: TA 152 H plan by Petr Kholar rubber powered 1/20 scale
Re: The Chzec aproach: TA 152 H plan by Petr Kholar rubber powered 1/20 scale
Re: The Chzec aproach: TA 152 H plan by Petr Kholar rubber powered 1/20 scale
Re: The Chzec aproach: TA 152 H plan by Petr Kholar rubber powered 1/20 scale
Re: The Chzec aproach: TA 152 H plan by Petr Kholar rubber powered 1/20 scale
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marcelop
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« Reply #2 on: November 02, 2018, 07:45:14 PM »

all rib wings is made by 1mm very light balsa sheet!!! seems to be fragile, but wrong!, is amazing the strongest of this design!
Attached files Thumbnail(s):
Re: The Chzec aproach: TA 152 H plan by Petr Kholar rubber powered 1/20 scale
Re: The Chzec aproach: TA 152 H plan by Petr Kholar rubber powered 1/20 scale
Re: The Chzec aproach: TA 152 H plan by Petr Kholar rubber powered 1/20 scale
Re: The Chzec aproach: TA 152 H plan by Petr Kholar rubber powered 1/20 scale
Re: The Chzec aproach: TA 152 H plan by Petr Kholar rubber powered 1/20 scale
Re: The Chzec aproach: TA 152 H plan by Petr Kholar rubber powered 1/20 scale
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marcelop
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« Reply #3 on: November 02, 2018, 07:51:26 PM »

my version of the chzec hook made with epoxi
Attached files Thumbnail(s):
Re: The Chzec aproach: TA 152 H plan by Petr Kholar rubber powered 1/20 scale
Re: The Chzec aproach: TA 152 H plan by Petr Kholar rubber powered 1/20 scale
Re: The Chzec aproach: TA 152 H plan by Petr Kholar rubber powered 1/20 scale
Re: The Chzec aproach: TA 152 H plan by Petr Kholar rubber powered 1/20 scale
Re: The Chzec aproach: TA 152 H plan by Petr Kholar rubber powered 1/20 scale
Re: The Chzec aproach: TA 152 H plan by Petr Kholar rubber powered 1/20 scale
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faif2d
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« Reply #4 on: November 02, 2018, 08:12:05 PM »

Glad to see you using some of the good stuff that I have sent.  I have some more left and will send some of what is left the next time I get a long box.  I like the hook, a very nicely done answer to the hook problem.
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« Reply #5 on: November 02, 2018, 10:30:23 PM »

There is a build thread On that  plan in Here:
 http://www.hippocketaeronautics.com/hpa_forum/index.php?topic=12182.0
 It might be useful informations.
I have this plan.
 But I found that the Plan's  Rudder is of poor design... "real' FW's had a fuselage thick rudder. (Look at photos)
It's a signature element in their design / appearance... that shouldn't be ignored, if possible
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marcelop
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« Reply #6 on: November 03, 2018, 05:27:35 AM »

in this plan, at the nro 14 bulkhead, i can see the thick of the rudder, is not correct??? iam searching for more detailled 3 views....
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marcelop
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« Reply #7 on: November 03, 2018, 05:37:55 AM »

i draw this sketche, my version of the chzec hook
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Re: The Chzec aproach: TA 152 H plan by Petr Kholar rubber powered 1/20 scale
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MKelly
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« Reply #8 on: November 03, 2018, 09:45:36 AM »

Very interesting build - look forward to seeing this come together.

What's the purpose/advantage of the "Czech hook"?  Is it to keep the rubber from climbing/bunching on the hook?

Mike
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marcelop
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« Reply #9 on: November 03, 2018, 11:37:32 AM »

yeah! this "device" keep the rubber without curling on the raer part of the hook
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« Reply #10 on: November 03, 2018, 01:41:16 PM »

Only an 190 A but same  rear fin thickness design
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Re: The Chzec aproach: TA 152 H plan by Petr Kholar rubber powered 1/20 scale
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marcelop
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« Reply #11 on: November 03, 2018, 04:11:08 PM »

picts from the last TA152 survivor
https://fockewulfta152h0.wordpress.com/


and bulkhead 14 on the lan of Petr Kholar
Attached files Thumbnail(s):
Re: The Chzec aproach: TA 152 H plan by Petr Kholar rubber powered 1/20 scale
Re: The Chzec aproach: TA 152 H plan by Petr Kholar rubber powered 1/20 scale
Re: The Chzec aproach: TA 152 H plan by Petr Kholar rubber powered 1/20 scale
Re: The Chzec aproach: TA 152 H plan by Petr Kholar rubber powered 1/20 scale
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fred
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« Reply #12 on: November 03, 2018, 05:11:42 PM »

Good link  thank you.
On the plan look at the top view... directly above Former 12.
Viewed from above..  rudder's leading edge should be a long triangle from rudder tip to bulkhead 14 width... it's not drawn on the plan.. for whatever reason.
A significant difference imo ...because it's  not well detailed in the plan,  it  leads  to thin rudder build error , from simply following the plan diagram.
Post #2 shows that you did exactly this :-) whether you wish to correct this.... is up to you.
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RolandD6
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« Reply #13 on: November 03, 2018, 06:15:33 PM »

Re: Czech hook

The 'butterfly' or 'bow tie' shape forces the rubber to expand when it tries to climb the hook. There are a lot of ideas around including Marcelop's solution. Bent wire also works.
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Re: The Chzec aproach: TA 152 H plan by Petr Kholar rubber powered 1/20 scale
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marcelop
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« Reply #14 on: November 03, 2018, 08:55:12 PM »

this piece seems to be added when the fuselaje is finished and rudder glue in place,.....or is Is it necessary to glue it before the final assembly? Tongue
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Re: The Chzec aproach: TA 152 H plan by Petr Kholar rubber powered 1/20 scale
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marcelop
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« Reply #15 on: November 03, 2018, 08:56:44 PM »

the butterfy hook is flaT???
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« Reply #16 on: November 04, 2018, 01:33:17 AM »

the butterfy hook is flaT???

OK. Poor choice of simile. My wire hook is flat like your resin and wire hook. Yes, butterflies fold their wings vertically when at rest but they do assume a flattish position on each downstroke in flight. It is the shape that is important like your resin example. The tight rubber loop has to expand to climb the hook, in your example and mine. I have seen examples where the wire hook is round (like yours) and there is a length of straight wire soldered to the bottom of the loop and square to the axis of the prop shaft. The assembly is still flat. It is the flat shape that matters, which I am sure you realise, not how you get that shape. A big advantage of your hook is that there are no sharp points that can cut the rubber, unlike the soldered example I tried to describe.
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marcelop
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« Reply #17 on: November 04, 2018, 04:29:06 AM »

i read (but lost the link) about reverse "s" hooks....(this is not flat ) but i try to rescue the link to test another choises....i try to test the butterfly in a jig with rubber to watch how it works...
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« Reply #18 on: November 04, 2018, 06:27:27 PM »

Petr Kolář and his model.
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Re: The Chzec aproach: TA 152 H plan by Petr Kholar rubber powered 1/20 scale
Re: The Chzec aproach: TA 152 H plan by Petr Kholar rubber powered 1/20 scale
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marcelop
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« Reply #19 on: November 08, 2018, 05:23:28 AM »

little progress yesterday, fuselaje formers n|1 and 2 in 2mm, all the formers remaining in .8mm
this stage take a little time......
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Re: The Chzec aproach: TA 152 H plan by Petr Kholar rubber powered 1/20 scale
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