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Author Topic: P-51D  (Read 1384 times)
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Antonin Alfery
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« on: May 16, 2021, 05:12:25 AM »

I built P-51D Mustang - my 35 years old P-51H looks pretty "used" now... Also this new model is made of foam, it is heavier compared to the old one (10g vs. 8g) but the impression is much better in my opinion. The Peanut model is in 1:34 scale, I used art decals from the 1:32 plastic model - to create something like this is beyond my ability ...
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P-51D
P-51D
P-51D
P-51D
P-51D
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Gary Dickens
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« Reply #1 on: May 16, 2021, 05:31:05 AM »

That's fantastic.
Gary
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MKelly
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« Reply #2 on: May 16, 2021, 06:27:15 AM »

Wonderful!
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USch
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« Reply #3 on: May 16, 2021, 06:33:51 AM »

a class of his own....fantastic !!!!!!!!!!!!

Urs
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Russ Lister
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« Reply #4 on: May 16, 2021, 07:03:36 AM »

The 35 year old one is superb ... the new one is a step up again Smiley
Your Tigercat was the first of your models to leave a big impression on me .... and that was 'just' 17 years ago ...
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TheLurker
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« Reply #5 on: May 16, 2021, 07:21:17 AM »

Stunning bit of work.
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kaintuck
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« Reply #6 on: May 16, 2021, 08:14:28 AM »

Great model!
Those panel lines and decals make a real eye candy...even those tires have tread
Marc
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martynk
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« Reply #7 on: May 16, 2021, 09:44:50 AM »

That looks lovely. Very nice indeed

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Martyn

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Martyn
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« Reply #8 on: May 16, 2021, 01:17:44 PM »

Superb model, and to survive so well for 35 years - the new one ...wow
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Antonin Alfery
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« Reply #9 on: May 19, 2021, 01:51:53 AM »

Thank you all for your kind words. The main difference is in the construction of the wing. The wing on the P-51H was glued from the top and bottom sheets with a balsa spar in the middle. The wing on the P-51D is cut from a single piece of polystyrene and with a leading edge of ground carbon log. It also acts as a spar and protects the leading edge from damage in impacts with obstacles - this was the biggest problem of the P-51H. Ravatherm polystyrene can also create a much smoother surface than the polystyrene I used before. So there is no need to coat it with microfilm such as Spitfire.
Attached files Thumbnail(s):
Re: P-51D
Re: P-51D
Re: P-51D
Re: P-51D
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Pinto
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« Reply #10 on: May 19, 2021, 08:04:08 AM »


 Is the fuselage moulded or carved foam?

  Chris
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Pete Fardell
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« Reply #11 on: May 19, 2021, 06:07:52 PM »

Just beautiful. An exquisite gem of a Mustang.
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Antonin Alfery
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« Reply #12 on: May 21, 2021, 04:40:33 AM »


 Is the fuselage moulded or carved foam?

  Chris

Fuselage is vacuum moulded.
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Pinto
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« Reply #13 on: May 21, 2021, 08:39:24 AM »


 Many thanks for the information.

Chris
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rlucas
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« Reply #14 on: October 08, 2021, 09:53:45 AM »

Beautifull model Antonin! It looks even more convincing then your old P-51... Nice with the carbon on the leading edge, I have been thinking about this as well. What was the exact type of the Ravatherm polystyrene? XPS 200? I have been looking for a new foam myself that sands well.
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philly
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« Reply #15 on: October 08, 2021, 05:57:17 PM »

Its people like you who make my builds look bad!
Could you explain how to vacuum mold a fuselage?
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OZPAF
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« Reply #16 on: October 08, 2021, 07:09:25 PM »

What a beautiful model Antonin - I thought it was the plastic model! Vacuum forming thin sheets of foam? With heat?

happy flying

John
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Amsterdam
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« Reply #17 on: December 07, 2021, 09:15:43 PM »

Obviously not the model builder but he’s either vacuumed foam sheet over a plug, or compressing foam sheet in a male and female mold (female would have all the outer surface detail)
Lots of ways he could create plugs or molds, casting plastic scale models comes to mind although would be pricey.
Low Heat would be used with all methods i believe, although some foams like Rohacell (not what’s used here) can be compression molded with no heat.
Heat through air or water mediums works, foam melts instantly if it’s too hot.

Idk if you guys were looking for how one would vacuum mold foam or how the OP does, so 2 cents added.
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Antonin Alfery
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« Reply #18 on: December 17, 2021, 02:49:03 AM »

I'm sorry I didn't reply - I haven't been here for a while.

Amsterdam is right. In this case, vacuuming was used on the positive mandrel. It is less accurate than the negative mold, but accurate enough for the size of the model. The surface quality is also sufficient but above all it is a much cheaper way than vacuuming into a negative mould. The material used is similar to Depron, 3mm thick plates are cut to half thickness with hot wire. Rohacel is not a suitable material for these purposes. Heating is by infrared heater. The principle is simple, but the implementation quite complex - mainly because of the properties of the material used - it is a thermal insulator with minimal heat capacity.

This method of production makes sense for multiple pieces. By cutting and grinding the fuselage out of a block of polysterene, the same and in some cases even better result can be achieved. Both in terms of appearance and weight. It's just a lot more dust...
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OZPAF
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« Reply #19 on: December 23, 2021, 07:05:45 PM »

Thank you Antonin - I'm not sure I could sand foam well enough to be recognisable!

Merry Christmas.

John
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Amsterdam
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« Reply #20 on: December 29, 2021, 10:14:04 PM »

The principle is simple, but the implementation quite complex - mainly because of the properties of the material used - it is a thermal insulator with minimal heat capacity.


Thank you for saying what I couldn’t find the words for!

Also agreed with your statements on when vacuum makes sense, any beginner with XPS should just carve the foam
To anyone wanting to try a foam free flight build in the US, any big box home improvement store sells 2’x2’x1” “project boards” of useable foam insulation, (foamular, certifoam, kingspan) they are all 25PSI R5 foam and while delicate totally applicable for free flight builds.

Don’t expect to get something as beautiful and symmetrical as Antonin’s builds, but I think you will be surprised how quick you’ll get the hang of it.
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