What if

GROUP BUILDS => 2019 One Week Build => Topic started by: Tophe on June 05, 2019, 08:57:32 pm

Title: BD-5 family drawings
Post by: Tophe on June 05, 2019, 08:57:32 pm
Thanks to TheChronicOne‘s project of building a Luftwaffe BD-5 ( https://www.whatifmodellers.com/index.php?topic=46572.0 ), and with the rule:
2)  Any subject, any scale - but must be a what if. Profiles and stories also eligible.
I consider drawing a family of BD-5 drawings, maybe not all (in one week only):
[with background: true BD-5, BD-5J jet, Acapella twin-boom]
BD-5Z zwilling, Acapella jet
Dreams P-38BD-5, P-38BDZ zwilling, P-38BDN not triplex boom
Profiles P-51BD-5, P-82BD-5
Title: Re: BD-5 family drawings
Post by: Tophe on June 05, 2019, 10:07:29 pm
BD-5Z zwilling
Of course there would (will?) be different versions of this:
- twin piston
- twin jet
- asymmetric piston+jet
Title: Re: BD-5 family drawings
Post by: Tophe on June 05, 2019, 11:22:28 pm
I will not start drawing before Saturday 8th, this is the rule, but I have started gathering information. Interesting:
- there was a turboprop BD-5T (I got the 3-view drawing, similar to BD-5A/B)
- there was a sailplane BD-5S (aspect: unknown)
- there was a V-tail BD-5 prototype (I will draw the zwilling of it, if I have time)
- there was a BD-5 with F-100-style nose (I will draw the zwilling of it as well)
Of course the zwilling may have versions with separate tails and joined tail, with or without external tailplanes... This seems a rich subject, thanks again to TheChronicOne!
Title: Re: BD-5 family drawings
Post by: NARSES2 on June 06, 2019, 06:37:18 am
Looking forward to these Tophe  :thumbsup:
Title: Re: BD-5 family drawings
Post by: PR19_Kit on June 06, 2019, 06:42:01 am

- there was a sailplane BD-5S (aspect: unknown)


There actually was one, but they never flew it as a sailplane and put an engine in it.

Such a pity. :(
Title: Re: BD-5 family drawings
Post by: JayBee on June 06, 2019, 09:41:22 am
The BD-5S did fly as can be seen in the photo on this page from the 1978 Janes World Sailplanes.
Apparently it was difficult to control, the tailplane and wing being too close together, and so the project was not continued with.
The data also says that the aspect ratio was 12.88.

(https://imagizer.imageshack.com/img922/3117/Zouszj.jpg)


Title: Re: BD-5 family drawings
Post by: PR19_Kit on June 06, 2019, 09:45:03 am
Ah well, a case of differing references yet again.

The long wings come in the LS kit, and it says they're for the powered version too, so maybe they did put an engine in it eventually?
Title: Re: BD-5 family drawings
Post by: JayBee on June 06, 2019, 09:50:09 am
Then of course there is my model of the BD-5S which has been in this state of uncompletedness for a few years now.

(https://imagizer.imageshack.com/img922/4336/NqN1HH.jpg)

(https://imagizer.imageshack.com/img924/867/dC85mu.jpg)
Title: Re: BD-5 family drawings
Post by: Tophe on June 06, 2019, 10:18:19 am
 :wub:
Wonderful! Thanks a lot! :thumbsup:
Title: Re: BD-5 family drawings
Post by: Nick on June 07, 2019, 02:55:19 am
Would extending the body of the BD-5 allow for better stability, with or without long wings?
Title: Re: BD-5 family drawings
Post by: Tophe on June 07, 2019, 03:06:49 am
Would extending the body of the BD-5 allow for better stability, with or without long wings?
The BD-10 was longer like you say but this is less pretty/cute… (I am a dreamer, not a pilot). ;)
Title: Re: BD-5 family drawings
Post by: PR19_Kit on June 07, 2019, 04:48:35 am

Would extending the body of the BD-5 allow for better stability, with or without long wings?


It'd surely give the tail greater authority, and the problem may have been exaggerated by CG issues without the originally intended engine in there.

But then it'd take up more space and the whole idea was to make it small.
Title: Re: BD-5 family drawings
Post by: Tophe on June 08, 2019, 08:01:26 pm
First clicks for the drawing (with Corel Draw Home 2018). More to come.
(https://img.photobucket.com/albums/v670/Tophe2712/Twin-Bede-5_b_zpsm0bu0gah.jpg)
Title: Re: BD-5 family drawings
Post by: Tophe on June 08, 2019, 08:47:01 pm
In less than one week, the first drawing is done... ;)
(http://www.kristofmeunier.fr/Twin-Bede-5_d.jpg)
But the goal is the family: with J, S, V, F (and P-38/51 mixes)
Title: Re: BD-5 family drawings
Post by: Tophe on June 08, 2019, 08:58:58 pm
Before the rest of the family, here are the prototypes:
(http://www.kristofmeunier.fr/Twin-Bede-5_e.jpg)
Title: Re: BD-5 family drawings
Post by: Tophe on June 09, 2019, 02:05:16 am
Thanks to JayBee, here is the BD-5S and Zwilling related one:
(http://www.kristofmeunier.fr/Twin-Bede-5_f.jpg)
The long span is special for PR19_kit, maybe ;)
Title: Re: BD-5 family drawings
Post by: Tophe on June 09, 2019, 03:14:38 am
Then an asymmetric half-sailplane:
(http://www.kristofmeunier.fr/Twin-Bede-5_g.jpg)
Title: Re: BD-5 family drawings
Post by: PR19_Kit on June 09, 2019, 04:02:05 am

The long span is special for PR19_kit, maybe ;)


 :thumbsup: :thumbsup: :thumbsup: :thumbsup: :thumbsup: :thumbsup: :thumbsup: :thumbsup: :thumbsup: :thumbsup:
Title: Re: BD-5 family drawings
Post by: Tophe on June 09, 2019, 06:42:08 am
Thanks! ;)

And to complete further, here is the jet part:
(http://www.kristofmeunier.fr/Twin-Bede-5_h.jpg)
Title: Re: BD-5 family drawings
Post by: Tophe on June 09, 2019, 08:35:41 am
A half-jet twin features the difference in tailplane size:
(http://www.kristofmeunier.fr/Twin-Bede-5_i.jpg)
Title: Re: BD-5 family drawings
Post by: Tophe on June 09, 2019, 09:01:44 am
The next one featured a very rare asymmetry, with the center pod not central exactly:
(http://www.kristofmeunier.fr/Twin-Bede-5_j.jpg)
Title: Re: BD-5 family drawings
Post by: Tophe on June 09, 2019, 10:02:18 am
V-tail and V-V-tail:
(http://www.kristofmeunier.fr/Twin-Bede-5_k.jpg)
Title: Re: BD-5 family drawings
Post by: Tophe on June 09, 2019, 11:26:15 am
And a half-V-tail zwilling:
(http://www.kristofmeunier.fr/Twin-Bede-5_m.jpg)
Title: Re: BD-5 family drawings
Post by: PR19_Kit on June 09, 2019, 12:56:54 pm
The prototype BD5 really DID have a V tail.

(https://imagizer.imageshack.com/img923/7193/20kzmd.jpg)
Title: Re: BD-5 family drawings
Post by: Tophe on June 09, 2019, 05:40:23 pm
Yes, that picture was the source of my idea doing it (and that is why the canopy is different from standard on my drawing), but I had no 3-view to direct precisely, that is why I called mine BD-5V instead of BD-5 prototype :unsure:
Many more are coming, as well coming from photographs without 3-views: BD-5F, BD-5TB, BD-5P, BD-5U. In one day, it was not possible (with my computer used partly by my son), but a full Week is a lot of time (for Drawings, not for models)... :unsure:
Title: Re: BD-5 family drawings
Post by: TheChronicOne on June 09, 2019, 06:55:30 pm
Fantastic, bud!!!! 
Title: Re: BD-5 family drawings
Post by: Tophe on June 09, 2019, 07:19:39 pm
Thanks a lot!

Then, there was, actually built and flown, a BD-5 with a F-100 style nose:
(http://www.kristofmeunier.fr/Twin-Bede-5_n.jpg)
Title: Re: BD-5 family drawings
Post by: Tophe on June 09, 2019, 07:21:36 pm
The Acapella 100/200 were like twin-boom BD-5 but not exactly, so I prefer inventing my own twin-boom BD-5:
(http://www.kristofmeunier.fr/Twin-Bede-5_o.jpg)
(http://www.kristofmeunier.fr/Twin-Bede-5_p.jpg)

Title: Re: BD-5 family drawings
Post by: Tophe on June 09, 2019, 07:28:32 pm
Thanks to Secret Projects, I found on the Web a twin-jet BD-5, I call it BD-5U (unsure) :unsure:
(http://www.kristofmeunier.fr/Twin-Bede-5_q.jpg)
Title: Re: BD-5 family drawings
Post by: Tophe on June 09, 2019, 07:30:32 pm
Thanks to Secret Projects, I found on the Web a twin-jet BD-5, I call it BD-5U (unsure) :unsure:
As well for a BD-5 with nose propeller: (the P name is unsure, PP means Push-Pull)
(http://www.kristofmeunier.fr/Twin-Bede-5_r.jpg)
(http://www.kristofmeunier.fr/Twin-Bede-5_s.jpg)
Title: Re: BD-5 family drawings
Post by: Tophe on June 09, 2019, 08:21:08 pm
A Lightning P-38 married a BD-5 and they had 3 babies:
(http://www.kristofmeunier.fr/P38_persp_C_dq.jpg)
Title: Re: BD-5 family drawings
Post by: kerick on June 09, 2019, 08:23:13 pm
Your creativity always brightens my day! :mellow:
Title: Re: BD-5 family drawings
Post by: Tophe on June 09, 2019, 08:27:55 pm
Thanks!

Maybe the last step is the wedding between other BD-5 and Mustang, Twin-Mustang. They had children too:
(http://www.kristofmeunier.fr/P-51_persp_A_bu.jpg)
Title: Re: BD-5 family drawings
Post by: Tophe on June 09, 2019, 11:05:17 pm
I forgot (to dream of) the single-fuselage push-pull BD-5. Here is she:
(http://www.kristofmeunier.fr/Twin-Bede-5_u.jpg)
Title: Re: BD-5 family drawings
Post by: Tophe on June 10, 2019, 08:11:40 am
What-if a B-58 Hustler pilot wants a fun plane at home (homebuilt)? What kit to buy and build? BD-5H! (or ZH):
(http://www.kristofmeunier.fr/Twin-Bede-5_v.jpg)
Title: Re: BD-5 family drawings
Post by: Tophe on June 10, 2019, 08:43:37 am
For the export market were designed the Bdirage and Twin-Bdirage:
(http://www.kristofmeunier.fr/Twin-Bede-5_w.jpg)
Title: Re: BD-5 family drawings
Post by: Tophe on June 10, 2019, 09:31:31 am
And canard versions too:
(http://www.kristofmeunier.fr/Twin-Bede-5_x.jpg)
Title: Re: BD-5 family drawings
Post by: Tophe on June 10, 2019, 11:27:39 am
and a twin-boom canard rarity:
(http://www.kristofmeunier.fr/Twin-Bede-5_y.jpg)
Title: Re: BD-5 family drawings
Post by: PR19_Kit on June 11, 2019, 09:51:46 am
We haven't seen the canard delta.....................yet.  ;) ;D
Title: Re: BD-5 family drawings
Post by: Tophe on June 11, 2019, 11:24:34 am
Thanks!
And yes, here is the missing link:
(http://www.kristofmeunier.fr/Twin-Bede-5_z.jpg)
Title: Re: BD-5 family drawings
Post by: PR19_Kit on June 11, 2019, 02:02:51 pm
Magnifique!  :thumbsup:
Title: Re: BD-5 family drawings
Post by: kerick on June 11, 2019, 05:47:05 pm
and a twin-boom canard rarity:
(http://www.kristofmeunier.fr/Twin-Bede-5_y.jpg)

This reminds me of something Burt Rutan would build.
Title: Re: BD-5 family drawings
Post by: TheChronicOne on June 11, 2019, 06:22:48 pm
BD-5U and BD-5H.  :thumbsup: :wub: :wub: :wub: :wub:
Title: Re: BD-5 family drawings
Post by: Tophe on June 11, 2019, 10:10:31 pm
Thanks!

This reminds me of something Burt Rutan would build.
Ahem, you know: the difference is that Burt Rutan is a sane engineer while I am a crazy dreamer... ;) ;D
(http://www.kristofmeunier.fr/Twin-Bede-5_za.jpg)
(http://www.kristofmeunier.fr/Twin-Bede-5_zb.jpg)
Title: Re: BD-5 family drawings
Post by: Weaver on June 12, 2019, 12:37:23 am
That twin-boom canard design looks like it would probably have something going for it in real life.

Re the BD-5S sailplane stability issue, one thing that occurs to me is that, since the engine isn't there, you could fit an extended boom into the tube where the prop/jet used to go, and mount the tail surfaces on it, thus putting them further back for greater leverage and also moving the C0fG back a bit to compensate for the loss of the engine. Of course, structural strength would be an issue, as would the lack of space for control linkages. Perhaps the latter issue might see them going back to a V-tail?
Title: Re: BD-5 family drawings
Post by: Tophe on June 12, 2019, 03:02:31 am
Dear Weaver,
I thank you for this idea that I would note have thought of, great!:
(http://www.kristofmeunier.fr/Twin-Bede-5_zc.jpg)

And this makes me think of the opposite direction: an even smaller BD-5, like a control challenge… For the code BD-5S could have been Small but was already Sailplane, BD-5T could have been Tiny but was already Turbo, so BD-5L is Smallest…:
(http://www.kristofmeunier.fr/Twin-Bede-5_zd.jpg)
Title: Re: BD-5 family drawings
Post by: Tophe on June 12, 2019, 03:31:09 am
And the BD-5L-3 was like a flying catalogue of versions, while the L-2 was a tailless fast one (even more difficult to control):
(http://www.kristofmeunier.fr/Twin-Bede-5_ze.jpg)
(thanks again, Weaver)
Title: Re: BD-5 family drawings
Post by: PR19_Kit on June 12, 2019, 04:08:39 am
I can see there being a run on the LS kit of the BD5 at this rate.  ;D
Title: Re: BD-5 family drawings
Post by: Tophe on June 12, 2019, 04:34:14 am
Sorry this is not yet the end... :-\

I add a simple asymmetric derivative like a Bv-141:
(http://www.kristofmeunier.fr/Twin-Bede-5_zf.jpg)

With a whole family of its own...:
(http://www.kristofmeunier.fr/Twin-Bede-5_zg.jpg)
Title: Re: BD-5 family drawings
Post by: Tophe on June 12, 2019, 10:15:08 am
Thanks to imagine they would actually fly!
(even if this is without pilot inside, to endanger no life…) ;D
Title: Re: BD-5 family drawings
Post by: Tophe on June 12, 2019, 06:06:56 pm
I agree with our friend Ericr logic: each airplane (or microplane) family must have seaplane versions (flying boat or/and floatplane):
(http://www.kristofmeunier.fr/Twin-Bede-5_zh.jpg)
Title: Re: BD-5 family drawings
Post by: Tophe on June 12, 2019, 09:29:06 pm
I agree with our friend Ericr logic: each airplane (or microplane) family must have seaplane versions (flying boat or/and floatplane):
Not forgetting twin-hull and single-float versions, of course:
(http://www.kristofmeunier.fr/Twin-Bede-5_zi.jpg)
Title: Re: BD-5 family drawings
Post by: Tophe on June 12, 2019, 09:42:04 pm
And maybe this one counts both as seaplane and (vertical) twin-boom (two longitudinal bodies holding the tail):
(http://www.kristofmeunier.fr/Twin-Bede-5_zj.jpg)
Title: Re: BD-5 family drawings
Post by: Tophe on June 13, 2019, 06:46:16 am
The biplane BD-5 had specific advantages: solidity, maneuverability... not speed.
(http://www.kristofmeunier.fr/Twin-Bede-5_zk.jpg)
Title: Re: BD-5 family drawings
Post by: ericr on June 13, 2019, 09:10:49 am
And maybe this one counts both as seaplane and (vertical) twin-boom (two longitudinal bodies holding the tail):

these are all excellent ideas ! thanks a lot !

Title: Re: BD-5 family drawings
Post by: Tophe on June 13, 2019, 11:20:57 am
Thanks for the approval of our "invented seaplanes" expert! ;D
(for visitors ignoring the magic of ericr's ones, see https://www.whatifmodellers.com/index.php?topic=40517.0 - 57 pages only... ;) )
Title: Re: BD-5 family drawings
Post by: ericr on June 13, 2019, 11:37:25 am
 ;)
Title: Re: BD-5 family drawings
Post by: Tophe on June 13, 2019, 06:55:55 pm
Thanks!

Now, more seriously, the BD-5+5 Mistel... whose layout is justified by a good technical reason: "attracting attention"...:
(http://www.kristofmeunier.fr/Twin-Bede-5_zm.jpg)
Title: Re: BD-5 family drawings
Post by: Tophe on June 14, 2019, 01:10:15 am
The XF-85 Goblin was also a very little plane, and this one is closed to the BD-5G:
(http://www.kristofmeunier.fr/Twin-Bede-5_zn.jpg)
Title: Re: BD-5 family drawings
Post by: Tophe on June 14, 2019, 12:24:06 pm
There was a BD-5 with annular wing, unbuilt alas... :-\
(http://www.kristofmeunier.fr/Twin-Bede-5_zo.jpg)
Title: Re: BD-5 family drawings
Post by: Tophe on June 14, 2019, 09:15:51 pm
The week is finishing soon...
2 versions of "fast twin-boom BD-5":
(http://www.kristofmeunier.fr/Twin-Bede-5_zp.jpg)
Title: Re: BD-5 family drawings
Post by: Tophe on June 14, 2019, 09:33:25 pm
And a flying wing version nicknamed Horten for some unknown reason:
(http://www.kristofmeunier.fr/Twin-Bede-5_zq.jpg)
Title: Re: BD-5 family drawings
Post by: Tophe on June 15, 2019, 06:44:52 am
The biplane BD-5 had specific advantages: solidity, maneuverability... not speed.
The triplane (Dreidecker in German like the famous Dr1) version goes further in this direction:
(http://www.kristofmeunier.fr/Twin-Bede-5_zr.jpg)
Title: Re: BD-5 family drawings
Post by: TheChronicOne on June 15, 2019, 04:52:35 pm
That flying wing is glorious!
Title: Re: BD-5 family drawings
Post by: Tophe on June 15, 2019, 06:07:25 pm
Thanks! ;D
Title: Re: BD-5 family drawings
Post by: Captain Canada on June 25, 2019, 05:24:44 am
Nice work Tophe ! Certainly hard to pick a favourite out of all of those. I like the twins and the push/pull idea !
Title: Re: BD-5 family drawings
Post by: Tophe on June 25, 2019, 05:29:46 am
Thanks Captain! It was fun and this is even better if other ones than me did smile too... ;)
Title: Re: BD-5 family drawings
Post by: JayBee on June 25, 2019, 05:39:12 am
As the Capn. says, very difficult choice.
Me, I like Horten BD-5. Well, it has long wings!  :rolleyes:
Title: Re: BD-5 family drawings
Post by: PR19_Kit on June 25, 2019, 05:44:22 am

Me, I like Horten BD-5. Well, it has long wings!  :rolleyes:


There's a man who thinks right.  :thumbsup: ;D