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HomeScaleAircraftHelicopterScale Model RC Helicopters Docs  Agusta A119 Trex 450 Project
11-18-2008 08:00 PM  9 years agoPost 1
Boffy

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Linlithgow

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I have a Trex 450 which I fancied putting in a standoff scale lightweight fuselge. I want it to look more 'helicoptery'
My particular favourite helicopter is the Agusta A119.

I wasn't sure whether to place this here or on the Align part of the forum. I hope I dont offend any scale gurus!

After much research I have been unable to find one in just the right scale so have decided to make it myself. The aim is to enclose as much of the tailbox without sacrificing the scale appearance too much. I have decided to place some photos of my progress here.

Once I had worked out the correct dimensions I started cutting out the pattern from styrofoam and starting shaping it.

Next I started doing some work on the tail and started to cut out some of the detail items.

Here you can see the left half fuselage with door details in place.
I'm not entirely happy with the tail and think I will remake it. It seems to droop a bit at the end.

Here is the state we are at just now.

Not on a par with Rotor George's 1/4 scale jetranger and longranger but we all have to start somewhere.
I'm going to rebuild the tail tomorrow with the aim of improving the lines.

The aim will be to make it from clear PETG. I'm currently waiting for the plastic as it is out of stock so there is no massive rush.

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11-19-2008 03:20 PM  9 years agoPost 2
Boffy

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Linlithgow

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I had some Styrene and wanted to check dimensions and clearances on the tail were correct so I quickly roughed up a tail

I'm quite happy with the clearances and it allows the tailbox to be fully enclosed with enough clearance around the control horns and rods.

Here we can see it with the front fuselage half in the background behind.

I'm very happy with the results so far and it has allowed me to identify the areas requiring work. Clearly forward of the tail rotor requires some work but it fits which was the object of that exercise. I'm going to add in an extra 8mm in length to allow the tail rotor to sit in a better position. It will be easy to trim it down to is exact size to suit the front fuselage.

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11-19-2008 09:54 PM  9 years agoPost 3
axemanclint

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Cypress, Tx. USA

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YEAH!!! Looking good man! I like it!

Can't wait to see how it turns out. what do you believe the cost of these are going to be? If you know that yet, or just estimate?

"what goes up must come down," hopefully in one piece!

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11-19-2008 11:01 PM  9 years agoPost 4
Popcorn

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Switzerland

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WOW! It looks great! Nice job! This is really a big fuselage for a 450

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11-19-2008 11:10 PM  9 years agoPost 5
axemanclint

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Cypress, Tx. USA

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This is really a big fuselage for a 450
actually its pretty normal size. you should see how big the MD500 from Align for the 450 is.

"what goes up must come down," hopefully in one piece!

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11-19-2008 11:33 PM  9 years agoPost 6
Popcorn

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Switzerland

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11-19-2008 11:38 PM  9 years agoPost 7
axemanclint

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Cypress, Tx. USA

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yeah! Exactly. Cool video, what an awesome indoor flying location.

"what goes up must come down," hopefully in one piece!

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11-21-2008 01:21 AM  9 years agoPost 8
Boffy

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Linlithgow

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Price
Not sat down and worked out a price yet.
It will be competitive so if anyone is interested PM me and I'll get back to them when I have established my costings.
I have done a bit more work on the tails which are looking much better. I dont have a photo of them yet.
Got my PETG now so hoping to make some within the fortnight.

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11-23-2008 03:20 AM  9 years agoPost 9
Sidneyw

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Huntersville, NC

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Any update?

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11-25-2008 10:56 PM  9 years agoPost 10
Boffy

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Linlithgow

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OK here's an update of my progress so far.
I quickly formed a 'rough' front half fuselage to ensure that with the lengthened tail everything was going to work out correctly. The photo shows the original short tail. The extended tail will move the front fuselage forward relative to the main shaft.

I'm very pleased with the results of that wee test.
There are a few wee imperfections so it's now time to work on getting it right. Lots of filling and sanding.

I'm determined that this will be as good a job as can be done with this technique, so am paying a lot of attention to the intersection between the tail and the front fuselage. The lines have been improved with the additional 10mm to the tail and it has blended in very nicely.

Here you can see the fruits of my labour in a 'tidy workspace'

Well the next job is adding the detail. I have already fabricated the sliding doors and front doors. I will have to make up the window detail next and apply all of those.

In case anyone is wondering the overall length now with the extended tail is 710mm.

I'm still on schedule to produce some fuselages within the fortnight.

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11-26-2008 12:16 AM  9 years agoPost 11
axemanclint

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Cypress, Tx. USA

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That sounds awesome. Looks good too! I can't believe its going to be to be 710mm long, that's awesome. It's going to make the 450 look huge. Keep us posted, great work so far.

"what goes up must come down," hopefully in one piece!

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11-26-2008 12:33 AM  9 years agoPost 12
MattJen

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UK

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Hi

i have a question for you if you dont mind..

I had one of the A109 on 3 wheels, one of the greatest problems i came accross was fitting the mechanics into it, i had to take the tail apart and take out the tail output shaft so i could slide it all down on the inside of the fuse, this was ok in principle, but there was only a little hole at the end of the fuse to fix the tail back together again, and it was incredibly fiddly, especially when it came to tightening the belt.. you could not do it..

Does the tail cone come off on your fuses to enable easy access to the tail?

many thanks

Matt

All The Best

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11-26-2008 07:47 PM  9 years agoPost 13
Boffy

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Linlithgow

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[size=large]
Hi

i have a question for you if you dont mind..

I had one of the A109 on 3 wheels, one of the greatest problems i came accross was fitting the mechanics into it, i had to take the tail apart and take out the tail output shaft so i could slide it all down on the inside of the fuse, this was ok in principle, but there was only a little hole at the end of the fuse to fix the tail back together again, and it was incredibly fiddly, especially when it came to tightening the belt.. you could not do it..

Does the tail cone come off on your fuses to enable easy access to the tail?

many thanks

Matt
Thanks for the query.
The fitting of the fuselage is a lot to do wih the skill and preference of the modeller. It is very easy to join only the top half of the fuselage tail together with glue then leave the bottom edge open which can be joined either with tape or a better option is with small buttonhead self tappers and the appropriate backing material bonded in place inside the fuselage. All the halves can be joined in this way allowing it to be fully removeable and very secure. It is a good practice to use foam within the tail to help absorb and movement or vibrations.

The fuselage consists of two tail halves and two front halves and the stabilisers.

I shall finish the first fuselage and place updates here.

The first build will either be the NYPD livery or the yellow Koala. Maybe I'll do both then sell the one I decide not to keep.

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11-26-2008 09:00 PM  9 years agoPost 14
MattJen

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UK

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thanks for the Info Boffy, and for not taking my questiion as a critism, i hope you achieve your goal ,i will certianly be interested in one of them...

Matt

All The Best

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12-01-2008 05:50 PM  9 years agoPost 15
Boffy

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Linlithgow

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Latest progress
Well I have been working on the detail. Windows, doors, vents etc.
Here I am working out the position of the windows referring to numerous photos to get it right.

Once I was satisfied with the size and position of the windows etc I transferred it to plastic to provide the relief.

I'm pretty pleased with the way it has worked out. I have test formed the individual parts and I am satisfied with the way they come out.

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12-02-2008 06:01 PM  9 years agoPost 16
drken

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Jersey City, NJ

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Nice job on the sliding door. I was thinking of making an NYPD A119 for my first scale, I'm curious to see how yours comes out.

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12-11-2008 09:41 PM  9 years agoPost 17
Boffy

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Linlithgow

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Latest Progress
Well the weather here in Scotland and work has kept me out of my garage and away from this project for a week or so.
However I managed to get back to it today.
The patterns are approaching completion and I'm hoping to lay up moulds this weekend.

Here we see the Front fuselage halves with the door and window detail in place. I'm pretty pleased with this so moved on to paint them in preparation for the GRP mould layup.

Here you can see one front half fuselage painted. This should not bee to difficult to make the mould. The other half is at the sam,e stage as are the tails. Painting thew tails revealed a couple of minor imperfections which I want to correct prior to laying up the moulds. a little bumper filler should do the job.

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12-11-2008 09:46 PM  9 years agoPost 18
axemanclint

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Cypress, Tx. USA

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Looking good man! keep up the good work, can't wait to see the final product.

"what goes up must come down," hopefully in one piece!

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12-17-2008 10:35 AM  9 years agoPost 19
Boffy

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Linlithgow

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Mould making
Well the weekend saw some progress.
Here you can see the patterns completed and prepared for laying up the female mould.

Here are the tails during layup. Polyester resin in case anyone was wondering.

Realistically the first fuselages will be ready in the new year.
I'm actively looking at the next project and think a 450 Westland Lynx would make a good project.

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12-17-2008 08:31 PM  9 years agoPost 20
axemanclint

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Cypress, Tx. USA

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Ooohhh!!! I'm right behind you on the Westland Lynx idea!

Everything is looking good Boffy. Keep up the good work. Can't wait to see the finished product.
clint

"what goes up must come down," hopefully in one piece!

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