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Testors 4800 BD-5 Jet

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Thinking Testors 4800 BD-5 Jet

Post  Icemanjr92 on Sun Jul 05, 2015 9:41 pm

Does anyone know or have any information on a plastic U-control model that Testors made #4800? Looks like it had a small cox engine installed. I can't find any information or photos anywhere.

Thanks for your help.
Dino
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Thinking Re: Testors 4800 BD-5 Jet

Post  getback on Mon Jul 06, 2015 5:39 am

here's a pic of one I was interested in you said cox engine on a testors ?? http://www.worthpoint.com/worthopedia/testors-bd-control-line-airplane-52819223 I just googled it , what kind of info are you looking for ? , Welcome to the Forum DINO !!
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Thinking Re: Testors 4800 BD-5 Jet

Post  Oldenginerod on Mon Jul 06, 2015 7:58 am

It will have a Testors "Pipe Bomb" engine like this.

They used a prop shaft extension much like a boat drive shaft to the prop.

Rod.
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Thinking Re: Testors 4800 BD-5 Jet

Post  Icemanjr92 on Mon Jul 06, 2015 10:09 am

Thanks,
I saw one that I found on Google which was #4880 and white. Looks much newer than the one I have.
Mines pretty busted up but its clear. Well it was clear at one point. Now more of a yellow tint from age.
Surprised that there's not much information about it that I can find. Manual, year of manufacture, sales brochure or ad.
Just wondering the history of this model. Thanks for your input!
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Thinking Re: Testors 4800 BD-5 Jet

Post  RknRusty on Mon Jul 06, 2015 10:45 am

Welcome to CEF, Iceman.
Rusty

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Thinking Re: Testors 4800 BD-5 Jet

Post  Icemanjr92 on Mon Jul 06, 2015 10:48 am

THANKS RUSTY!!!
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Thinking Re: Testors 4800 BD-5 Jet

Post  crankbndr on Mon Jul 06, 2015 10:55 am

Mark Boesen runs .049 Collectors group, he has these photos. James Bond flew em!!

https://groups.yahoo.com/neo/groups/049Collectors/info

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Thinking Re: Testors 4800 BD-5 Jet

Post  Icemanjr92 on Mon Jul 06, 2015 11:08 am

Thank you. I have seen the white ones before but not the clear one as I have. Its weird. Wonder if this was a prototype or special clear edition at one point.
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Thinking Re: Testors 4800 BD-5 Jet

Post  Mudhen on Mon Jul 06, 2015 2:00 pm

Hi Icemanjr92
Welcome to the forum.
A BD-5 molded in clear plastic would not have been a production model.
There are a few possibilities:
1. If the airplane is molded is clear polypropylene, (a nylon-esq, opaque-colored, plastic,) then it may have been used to clean the mold. Plastic injection mold machines can have plastic pool and clump in certain areas, (corners, injection nozzles, etc.) To clean the molds, nylon is used because it helps rid the mold cavities of deposits.

2. A pre-production sample. After the molds for a model are complete there are several test samples formed. To the manufacturer, the color of the sample is irrelevant. Its purpose is to make sure that all parts fit correctly. If they do, then production can begin. If not, corrections are made to the mold until the parts fit.

3. The molds for a model, (that is, the steel cavities into which the parts for the model are cut,) should not be confused with the injection mold machine itself. The molds are set into the mold machine which contains the heaters, nozzles, plastic pellets, hoppers, etc. It’s possible that after the mold for the BD-5 was cut, (or after maintenance for the mold,) it was placed into an injection mold machine that happened to be available, and at the time happened to contain clear plastic pellets. There are two ways to purge a mold from one color to the next; the manufacturer can heat the injection mold machine and allow the heated plastic to drain from the mold. Or, they can run the machine, forming the parts that are in the mold until the old color, (clear,) is purged, and the new color, (white,) is pure.
What you have is very rare. It might be worth restoring and displaying, rather than flying.
And because it is rare, extreme caution should be taken in its restoration. There are no spare parts available for off-colored, non-production models.
Lates…
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Thinking Re: Testors 4800 BD-5 Jet

Post  Icemanjr92 on Mon Jul 06, 2015 2:32 pm

Thank you very much for the great info.
The model is in very bad shape. The plastic is very hard and very brittle.
It has cracks and is missing a few broken pieces over the years. It would never be able to fly.
I do not think that this plastic was ever used in production either. I have had 30+ models in my hands where the plastic was still flexible.
The production kit seems to have the number 4880 on them. This has 4800
There also seems to be a film over the plastic in some areas. Sort of like PVA when we make our fiberglass fuses.

I have taped the pieces that I found in their place. I dont want to glue them. Still missing some tail pieces.
But this is all I have. :-)

Its very unusual to say the least.

I am new here, how can I post photos in the thread?


Last edited by Icemanjr92 on Mon Jul 06, 2015 2:33 pm; edited 1 time in total (Reason for editing : Forgot a line)
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Thinking Re: Testors 4800 BD-5 Jet

Post  David S on Mon Jul 06, 2015 6:39 pm

Oldenginerod wrote:It will have a Testors "Pipe Bomb" engine like this.

They used a prop shaft extension much like a boat drive shaft to the prop.

Rod.
I have one of the Testors pipe bomb engines. I did not know who made this engine before I saw this post. How did this engine mount to the plane? It has a cast set of ears or slot on the off side.No drilled holes anywhere.

David S
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Thinking Re: Testors 4800 BD-5 Jet

Post  Icemanjr92 on Mon Jul 06, 2015 7:14 pm

Would love to show you but I cant post any photos yet... Im on probation :-P
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Thinking Re: Testors 4800 BD-5 Jet

Post  Marleysky on Mon Jul 06, 2015 7:19 pm

David S wrote:
Oldenginerod wrote:It will have a Testors "Pipe Bomb" engine like this.
They used a prop shaft extension much like a boat drive shaft to the prop.

Rod.
I have one of the Testors pipe bomb engines. I did not know who made this engine before I saw this post. How did this engine mount to the plane? It has a cast set of ears or slot on the off side.No drilled holes anywhere.

David S

Testors used a "clam shell"type of mounting to hold the engine in place. See page 3 of this thread for a plane held together with just one screw!
https://www.coxengineforum.com/t8062p40-fun-with-generic-non-threatening-title#102571

As for posting pictures, you have to have a certain number of posts or length of time or something (probation?) .  I can't search wile typing, but if you type" how to post pictures on forum" in a search box, you should find the easy to follow thread and instructions on what to do. Here it is........

GoTo: https://www.coxengineforum.com/t367-how-to-post-an-image-in-a-topic
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Thinking Re: Testors 4800 BD-5 Jet

Post  David S on Mon Jul 06, 2015 7:47 pm

Marleysky wrote:
David S wrote:
Oldenginerod wrote:It will have a Testors "Pipe Bomb" engine like this.
They used a prop shaft extension much like a boat drive shaft to the prop.

Rod.
I have one of the Testors pipe bomb engines. I did not know who made this engine before I saw this post. How did this engine mount to the plane? It has a cast set of ears or slot on the off side.No drilled holes anywhere.

David S

Testors used a "clam shell"type of mounting to hold the engine in place. See page 3 of this thread for a plane held together with just one screw!
https://www.coxengineforum.com/t8062p40-fun-with-generic-non-threatening-title#102571

As for posting pictures, you have to have a certain number of posts or length of time or something (probation?) .  I can't search wile typing, but if you type" how to post pictures on forum" in a search box, you should find the easy to follow thread and instructions on what to do. Here it is........
Thank you for the link on your P51 testors plane.I have not seen this plane.It must have been cheap to produce!

David S
GoTo: https://www.coxengineforum.com/t367-how-to-post-an-image-in-a-topic
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Thinking Re: Testors 4800 BD-5 Jet

Post  Icemanjr92 on Mon Jul 06, 2015 7:49 pm

I sent Eric G the photos to post for me... So we will wait and see.
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Thinking Re: Testors 4800 BD-5 Jet

Post  getback on Mon Jul 06, 2015 8:11 pm

     https://i.servimg.com/u/f18/18/06/36/59/img_7813.jpg" />        with a little help from your friends
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Thinking Re: Testors 4800 BD-5 Jet

Post  Mudhen on Mon Jul 06, 2015 8:34 pm

Looking at the pictures, my guess is that it’s polystyrene and was originally very clear.
It also seem to me that since it is built up as a factory airplane that it may have been
used by Testors as a display model for the various trade shows when the item was either released, or planned for release.
That’s a very unique piece. If the plastic is brittle, then it might be best just to clean it with cotton balls dipped in warm water and Dawn dishwashing liquid.
You can try and assemble the model, but I wouldn’t try disassembly. If it is brittle, that means the plastic may have shrunk.
In that case the screw bosses are squeezed against the self-tapping threads. Any attempt to unscrew them may cause the boss to break.
Cool find.
Where did you get it?
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Thinking Re: Testors 4800 BD-5 Jet

Post  Icemanjr92 on Mon Jul 06, 2015 9:12 pm

I would not attempt to take it apart or clean it.
It's just too brittle. Also, the color will never get back to clear.
The age has discolored it. I may use a glue aside of CA to piece it together.
CA will haze the plastic. I'm afraid of losing the parts so I'll figure something out.
It's a pretty amazing piece. Just wish we knew exactly what it's purpose was for.
Someone who works for Testors now or then must have a vault or archive of info somewhere....
A friend of mine gave the model to me.
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Thinking Re: Testors 4800 BD-5 Jet

Post  Mark Boesen on Mon Jul 06, 2015 10:18 pm

Very cool!!!! I've never see this version as well, its gotta be very rare. I would do your best to preserve it, clean it up and display it out of sunlight. You might consider Testors glue (lol) on some broken parts instead of tape. If it cracked its cracked and tape or glue shouldn't really matter.
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Thinking Re: Testors 4800 BD-5 Jet

Post  Icemanjr92 on Mon Jul 06, 2015 10:58 pm

Thanks Mark,
Tape is just to hold the pieces in place so I don't lose them.
I'll glue them when I figure out the best glue. Wish I had the rest of the tail pieces
but this is all I have.
It's mostly there and makes a great conversation piece!
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Thinking Re: Testors 4800 BD-5 Jet

Post  Oldenginerod on Tue Jul 07, 2015 3:46 am

If it's polystyrene as Mudhen suggests then most of the popular glues for building plastic (styrene) models will do the job. The Testors 3501 plastic cement should work. It actually causes the surfaces of the join to melt together, making a stronger bond than just glue that sticks one piece to another. You could test it out on one of the more damaged pieces first.
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Thinking Re: Testors 4800 BD-5 Jet

Post  Icemanjr92 on Tue Jul 07, 2015 8:43 am

Thank you sir!
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Thinking Re: Testors 4800 BD-5 Jet

Post  KariFS on Tue Jul 07, 2015 11:17 am

One thing to note is that polystyrene cement will discolour clear parts. Not as bad as cyano but still somewhat. I used to build plastic models as a kid (and will build again someday), and this often happened. Plastic modelers nowadays use white wood glue (pva) for clear parts such as canopies. Of course on a static plastic model the canopy just sits on top of the fuselage with no load so a weaker glue is OK.

You may want to try some clear epoxy, that won't react with the plastic but will stick. Epoxy also fills gaps if there are any.

That is an interesting piece you got, most likely an exhibition demonstrator, to show the unconventional power arrangement.

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Thinking Re: Testors 4800 BD-5 Jet

Post  Icemanjr92 on Tue Jul 07, 2015 4:00 pm

Ill check with Frank Tiano at FTE. Maybe the Plasti zap wont create a haze like most CA's. I doubt white glue will hold.
Could this BD-5 be a one off? Id love to hear about this more if anyone knows.
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Thinking Re: Testors 4800 BD-5 Jet

Post  getback on Wed Jul 08, 2015 7:37 am

Dino this article has a contact at the bottom of the page may be worth a shot to see if there is away to get more info, http://www.referenceforbusiness.com/history2/77/The-Testor-Corporation.html that is very difft. I like Very Happy Eric
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Thinking Re: Testors 4800 BD-5 Jet

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