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Author Topic: Show Your Newest Creation  (Read 96132 times)
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billdennis747
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« Reply #900 on: July 08, 2016, 01:12:38 PM »

A semi scale Halberstadt DII.  1/12, 30", o.5cc Banks Mills diesel.
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ffkiwi
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« Reply #901 on: July 08, 2016, 05:22:49 PM »

Very nice Bill-will Aeromodeller be publishing it in due course?   I take it you are aware of the NZ based D-IV replica? see : /www.youtube.com/watch?v=zOTxPEPyEiw. Useful for color documentation if nothing else

 ChrisM
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dputt7
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« Reply #902 on: July 08, 2016, 08:38:36 PM »

OH come on Bill, don't be so stingy with the photos, wish you had designed he tailplane on the original! Very neat.
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billdennis747
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« Reply #903 on: July 09, 2016, 04:32:53 AM »

Thanks Dave and Chris. I'm covering the thing now so I'll post a picture when it's done. I just built it over an enlarged 3 view and made it up as I went along.  I have enlarged the tail too much and it looks very wrong,  certainly relative to the tiny rudder. I've done one before with scale tail and it didn't work at all. May modify later.
That DIV looks to have a better tailplane
Bill
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Pete Fardell
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« Reply #904 on: July 09, 2016, 07:26:05 AM »

Is the tailplane any bigger on the IV? At any rate it looks to have less dihedral than the earlier Halberstadts.
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billdennis747
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« Reply #905 on: July 09, 2016, 07:33:50 AM »

Pete, there is only one photo of the IV. The separate elevators are joined across so it will have more area. The replica seems to be underhedralled
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ffkiwi
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« Reply #906 on: July 09, 2016, 03:48:30 PM »

There are plenty of photos of the D-IV replica on the 'net-I merely posted a few I had on file. I've been very tempted to build Bill's Peanut D-II as the D-IV replica-documentation would be a lot easier...

  ChrisM
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billdennis747
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« Reply #907 on: July 09, 2016, 04:34:33 PM »

Chris, that Peanut flies well but has a ceiling of 30 seconds in my hands. Nose weight - as ever.
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danmellor
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« Reply #908 on: July 09, 2016, 05:47:59 PM »

Nice one Bill! Lovely subject.

Cheers,

Dan.
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billdennis747
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« Reply #909 on: July 13, 2016, 09:37:47 AM »

All painted. There will be a hiatus while I figure out how to fix the rudder so I can adjust it. It's Modelspan tissue and so will become full of holes in short order. Thus far, 8oz so it should be under 10, which will mean 5oz/sq ft. I will make an engine and gun if it flies.
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dputt7
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« Reply #910 on: July 14, 2016, 03:53:26 AM »

Gee Bill, you don't seem to have followed the plan very well! Grin
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billdennis747
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« Reply #911 on: July 14, 2016, 04:40:37 AM »

Hi Dave, yes I failed to unfold it fully  and that's what I ended up with.
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p40qmilj
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« Reply #912 on: July 14, 2016, 02:37:07 PM »

 Grin jonah's birthday present (PAGE 36) has been flight tested and is fine for back yard flying

jim Grin
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OZPAF
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« Reply #913 on: July 14, 2016, 07:52:10 PM »

Quote
Hi Dave, yes I failed to unfold it fully  and that's what I ended up with.
Smiley
Just as well you didn't build it inverted Bill.

That's a nice looking tramp jom - bet Jonah loves it.

John
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p40qmilj
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« Reply #914 on: July 16, 2016, 06:52:25 PM »

 Grin Jonah had his birthday today; cake, swimming at the beach, friends and family and at the end he got the plane.  could hardly wait to get it airborne

grand paw  Grin
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Tmat
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« Reply #915 on: July 16, 2016, 07:14:36 PM »

My latest creation is a High Tech F1B with a molded carbon fiber skins (with Rohacell core). LDA airfoils (new from Brian Eggleston). Wing design is mine using 3D CAD models (Solidworks) and molds were CNC machined (using Huntsman 1400 blue tooling resin) by Adam Krawiec (Poland) and wings were produced through Stepan Stefanchuk's efforts (Ukraine) to my specifications.
First photo is my flying buddy Ladi Horak holding my model.\
First flights look very promising so far!


Tmat
- something different for HPA?
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OZPAF
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« Reply #916 on: July 16, 2016, 07:39:53 PM »

Is that a full moulded wing Tony? Very impressive.
John
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Tmat
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« Reply #917 on: July 17, 2016, 02:26:33 AM »

Yes, fully molded wing.

Tmat
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PeeTee
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« Reply #918 on: July 17, 2016, 02:44:41 AM »

Tony
Most impressive, and thanks for supplying a 3 view as well. I note the wing uses four 'foils from root to tip - one is more than enough for me Roll Eyes Grin. It looks as though the root continues to use the sorta Stanfoil flat section just after the leading edge. With the black carbon do you envisage any solar heating problems or were the wings cured at temperature?

Peter
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OZPAF
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« Reply #919 on: July 17, 2016, 03:14:48 AM »

That's an interesting development Tony. You should notice a fair jump in performance as we did with RC gliders.
Good luck with it.
John
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Yak 52
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« Reply #920 on: July 18, 2016, 01:00:15 PM »

Thats pretty darn cool Tony!

Jon
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USch
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« Reply #921 on: July 24, 2016, 06:02:22 AM »

Beautiful model and execution, Tony! If it fly's as it looks it must be a winner   Roll Eyes

Looking at the details it seems that the newly available light weight UD carbon tapes allow again to build full foam core, single layer covering with acceptable weight results. Food for thoughts.

One question about the tailplane section. If I understand right you use a thick, 8% section with a blunt nose, so not much camber (1,3%?). What is the reason and benefit from such an airfoil? A more linear response on AoA changes?

Urs
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Tmat
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« Reply #922 on: July 24, 2016, 10:01:49 PM »

Tony
It looks as though the root continues to use the sorta Stanfoil flat section just after the leading edge. With the black carbon do you envisage any solar heating problems or were the wings cured at temperature?
Hi Peter,
Yes, all of the airfoils except for the extreme tip use the "Stanfoil" flat nose feature as well as a surface turbulator. Works well.
Wings were cured at temperature but I will be adding some color for visibility in the grass and sky.

Tmat
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« Reply #923 on: July 24, 2016, 10:08:29 PM »

One question about the tailplane section. If I understand right you use a thick, 8% section with a blunt nose, so not much camber (1,3%?). What is the reason and benefit from such an airfoil? A more linear response on AoA changes?
Urs
Thanks Urs. I have an alternative tailplane with a 7.7% flat bottom airfoil which is what I use on all other models. The new tailplane might well have a more linear response to AoA, but the original idea was to add a "chin" on the underside near the leading edge to reduce drag. It was originally designed as an F1A stabilizer to reduce separation on the underside of the leading edge leading to excess drag during LDA bunt launches. I'm not sure about the suitability for F1B. I will see.

Tony
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« Reply #924 on: July 25, 2016, 03:57:31 AM »

Thanks for all the info Tony. From the little I know about moulded wings - the long thin tail of the wing aerofoils would have taken considerable skill to layup in the mould. However it's hard to see how you would achieve this section with accuracy and strength, any other way  Very impressive job of moulding.

John
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