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Piper Twin Apache PA23 -150 74"

Probably a very slow thread.........

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Danny Fenton15/03/2016 00:13:31
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Hi Ton, that is good to know....

The Herculite plug has been made for the front windshield. Rob Bulk of RBC Kits took Ton's 3D drawing and made a CNC plug which enabled him to vacform a windshield. Unfortunately it was full of bubbles and blemishes. It was also made from much too thin a plastic.
I took the vacform and supported the flimsey structure in sand, then poured Herculite into the vacform to create a new plug.

I am going to enlarge my vacform machine to take slightly larger sheets of 1mm PETG and have a go myself. If this all fails then I will courier the plug off to a local vac forming outfit.

It weighs in at 4.7kgs and that is with a large piece of foam in the centre to save me some Herculite.....

Herculite costs around £17 for a 25kg sack so it is fairly cheap

My bag of Herculite was even cheaper as a friend let me have what he had left after making a canopy mould thumbs up


Cheers
Danny

Danny Fenton07/09/2018 17:50:18
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9649 forum posts
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Blimey it looks like I haven't updated this thread in a while.

Looking forward to the Fury thread, but thought I would do a bit on my Apache whilst lingering the start.

I have vacformed the windows and glazed the fus. I have made some foam bits and am now glassing them ready for making a mould. The moulds are going to be using a new technique for me. Hopefully have them done in time for the next mag, so I will keep quiet about the technique for now, but as a teaser I will be using a soft mould with a rigid shell......

dsc_2643 (large).jpg

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I also routed the trailing edges and fitted 1/64 ply trailing edges. These close the gap to the control surface without impeding travel. They are a bit of a faff but look great when done.

dsc_2653 (large).jpg

Yes Ton, I am still working away on it.... all be it slowly my friend

Cheers

Danny

McG 696907/09/2018 20:56:41
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3300 forum posts
1255 photos

Hi Danny,

If an apprentice is allowed to have an 'educated' (?) guess... angel

A "soft mould with rigid shell""? ... Could that be applying a release agent to the plug, then make a glass counterpart with a thin gel coat and possibly a coat of glass fiber? Then keeping it all together to have a soft silicone casting around it... ??? question wink

No, that isn't the solution, after all. no

Cheers

Chris

ps > I really hope it will take less time to build your Fury... devil

Danny Fenton07/09/2018 21:26:17
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4458 photos
Lol nice one Chris, but nope. An Aussie modeller showed me this way of making a one piece mould, of an object that would normally require 2 or 3 sections.
You will have to wait and see
McG 696907/09/2018 21:36:29
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3300 forum posts
1255 photos

Well, Danny, then I truly hope you will explain the 'trick' here on your thread as well.

In fact, we can't buy a copy of the RCM&E mag here in BE and the outbound subscription price just doubles the price of it with the P&P rate.

We are just damned to remain 'stupid', I'm afraid... sad

Cheers

Chris

Martyn K07/09/2018 21:38:33
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5087 forum posts
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Get a digital subscription Chris.
Danny Fenton07/09/2018 22:09:22
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9649 forum posts
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A digital subscription sounds the answer Chris?
Yes of course I will explain. I am rubbish at keeping modelling tips to myself. I will no doubt spill the beans immediately if the method works
Cheers
Danny
Danny Fenton10/09/2018 20:16:55
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9649 forum posts
4458 photos

Whilst waiting for some lego to arrive (I didn't have enough, in fact can you ever have enough lego?)

I thought I would dabble with the tail cone. I could have used the vacforms that Rob had kindly done from the Cad files but I like blue foam, and prefer it to faffing around with vacform mouldings and trying to get them to allign....

Anyway a long way to go with the shape still. Unfortunately the only airframe I know of is at Doncaster Aero Park, and the aupper tailcone, under the rudder is missing, so I do not know how it goes. If anybody has pics or knows where an airframe is that i could go and photograph give me a shout?

Anyway, progress is creating enthusiasm, enthusiasm creates progress.......

tailcone shaping 1.jpg

Cheers

Danny

chris larkins10/09/2018 20:29:16
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220 forum posts
154 photos

some good pics on this site

**LINK**

Tony Bennett10/09/2018 20:30:46
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5082 forum posts
129 photos

cool i had forgotten about this build young sir.

Tony B

Danny Fenton10/09/2018 20:39:54
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Oooo Chris you star!!

Chris Bott - Moderator10/09/2018 20:59:20
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Great pics Chris.

Danny I want to know how you're going to handle all those "ripples" in the metal skin?

Now, where's the tongue in cheek emoticon?
Danny Fenton10/09/2018 21:17:51
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9649 forum posts
4458 photos
I will have to check and see if my subject is rippled. But it sounds like a gauntlet just landed at my feet
Unfortunately the panel i need to see is not in tha collection either. But great pics otherwise. Especially the exhaust collectors under the nacelles.
chris larkins10/09/2018 22:44:05
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220 forum posts
154 photos

skip forward to about 5 mins, there might be a shot here

**LINK**

Danny Fenton11/09/2018 07:08:21
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9649 forum posts
4458 photos

Thanks Chris i have watched that link before. Some say the Apache is ugly to me it looks perfectly balanced, with curves in all the right places
Anyway back to the tailcone.Rod over on the RCSB forum sent me a link to several PA23 cones for sale, and in amongst the adds i spotted this.

sam_9957_80d1e11513962524.jpg

sam_9958_35435f1513962525.jpg

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Edited By Danny Fenton on 11/09/2018 07:14:56

Martian11/09/2018 12:42:35
2540 forum posts
1169 photos

nice to see you working on the Apache again and did you acquire the tail cone

Danny Fenton11/09/2018 19:18:33
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9649 forum posts
4458 photos
Hi Martian, no I didnt need to go as far as buying the thing thankfully. Had a nice reply from the guy that took the walkaround on Chris's link though. He said he is away but would check his pics for any that might be useful that didnt make the website
Cheers
Danny
Danny Fenton05/07/2020 23:23:26
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9649 forum posts
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Okay its only been two years since the last update, but look who has appeared on the workbench.....

001.jpg

Cheers

Danny

Danny Fenton06/07/2020 12:23:47
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9649 forum posts
4458 photos

Okay Apache fans, the reason I walked away from this model were because I hit a problem that I couldn't easily solve. Well I made a mock exhaust duct and attacked the nacelle. Fortunately almost all the underlying structure is clear of the exhaust which is great.

I started trying the short section of formed litho until it was recessed 50% then opened up the nacelle fore and aft accordingly. Once I got close I realised the full length pipe was needed. I switched to thin litho as it was hard work forming the thick. Oh for a set of rollers!

Anyway you get the idea:

002.jpg

003.jpg

004.jpg

005.jpg

And if you are wondering what the hell I am doing, this is the full size.....

006.jpg

Cheers

Danny

Eric Robson06/07/2020 12:26:13
287 forum posts
50 photos

And I thought you took a long time to make the Fury! That looks good Danny, no problem cooling the motors.

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