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HomeScaleAircraftScale HeliScale Helicopter Main Discussion Docs  Agusta A119 Trex 450 Project
01-06-2009 11:03 PM  9 years agoPost 21
Boffy

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First trial of pattern using white styrene
Well after all the Christmas festivities I finally got out into my garage to get some more work done.

I have virtually completed the patterns and tonight I couldn't wait to try it out. This is what I suppose you could call a pre-production prototype from white styrene.

This is a front and rear half fuselage.

Here are the front and rear sections layed out in their relative positions.

I'll probably not manage to get any made for a week or so as I'm away skiing in Austria on Saturday for a week. I'll just have to see what I can get done before I go.

I've been working away on the Lynx dimensions and it should be a reasonable proposition. Watch this space.........

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01-07-2009 10:10 PM  9 years agoPost 22
Boffy

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Test Fitting Fuselage
Tonight I quickly test fitted the pre-production prototype fuselage.

The second photo shows the relief of the doors and windows nicely. There is a small wrinkle on the front of the fuselage but this is pre-production to work out the flanges and closure methods. It will be binned!

I'm looking forward to getting this into production so I can concentrate on the Lynx project!

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01-07-2009 10:20 PM  9 years agoPost 23
axemanclint

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Nice!! Man it is looking good! So have you given any thought as to how your going to do the Landing Skids? are there going to be some that are more Scale looking or will the Standard 450 Skids be used? Keep up the good work man, It's looking great!
Clint
P.S. I am currently doing all the work on my 50 size TT Agusta Koala that i am flying with T600E mechanics. Man working on scale is hard work and very tedious at times, especially when you are having to fab things up yourself!

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

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01-07-2009 10:40 PM  9 years agoPost 24
Boffy

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Thanks for the praise axemanclint.

I'm not sure about the skids. I will certainly leave that for the individual. I was thinking of using large Trex skids but that will unfortunately raise the height of the helicopter.
Realistically I think the scale skids will have to be scratch built. That should not be too difficult though.

I was looking at the skids for the Lynx and they are more of a challenge! It's very low to the ground!
I must say I do prefer the Army Lynx. I will have to get a 45 deg gearbox to work out all the detail for this build.
I will start a new thread for that one I think.

The TT Koala is a real beauty! Sadly I dont think I can convince her indoors that I need one!

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01-23-2009 04:18 PM  9 years agoPost 25
Boffy

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The A119 is coming along nicely.
Should have both halves formed from PETG tonight.

I will then paint it up probably in Koala Yellow for the first one as it's nice and easy.

I've bought a raised tail rotor assembly from Hightorque for the Lynx project. I have seen there are a couple of other options avalable from cnc helicopter and heliartist for raised tail rotors.
Th heliartist one has a 4 rotor head which is lovely but it does not raise the height very far.

Anyway I'm sure it has been done before but can't find it here.

How simple is it to switch the tail rotor of a Trex 450 from the right side to the left and what needs to be done to make it work?
Physically assembling it on the other side is simple but are there any issues that I should be aware of?
I think I have read something on it before regarding reversing the direction of rotation and the servo etc but really not sure.

Any help appreciated.

More pics of the 119 soon.

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01-23-2009 04:22 PM  9 years agoPost 26
axemanclint

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Sweet boffy!
Can't wait to see the pics.

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

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01-23-2009 04:36 PM  9 years agoPost 27
Boffy

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OK here is a quick photo of one half. I am very pleased with the results and should have the other half done this evening.

The second photo shows the front and rear sections together with a few AA batteries to give some scale to the fuselage.

I will test fit it on the Trex 450 frame while still clear to give a better impression of the scale and layout.
I'm really looking forward to it.

Of course once that is done I can concentrate on the Lynx!!!! :-)

If anyone wants a A119 PM me. I will be able to complete them next week. (Not before then due to work commitments)

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01-24-2009 03:46 PM  9 years agoPost 28
Boffy

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Well here are both halves taped together. I must say that taking photographs of a transparent plastic fuselage is not the easiest thing to do!!

and here's another view

It's a shame work always gets in the way of these things.

I'll try and fit the fuselage to the Trex in the next few days and post pics of that too.

Not too much work to finish it off then it is full steam ahead with the Lynx.

I'm definately going to paint this one in the yellow Koala demo colours.

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01-24-2009 04:04 PM  9 years agoPost 29
Sidneyw

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Nice indeed; can't wait to see it painted.
What would you be charging for the fuse?

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01-26-2009 06:04 AM  9 years agoPost 30
Boffy

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Hi Sidneyw

I have pm'd you.

Regards
Boffy

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01-29-2009 12:58 PM  9 years agoPost 31
Boffy

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Latest News
Well work as always keeps interupting my progress.

Hopefully today I will start fitting the fuselage and trimming and bonding it. I have the paint ready and once I mask the windows I may even get a coat of paint tonight. (I think that's a bit optimistic though)

I have made progress on the Lynx project and will start a thread on it in a minute but here are a few photo's to whet the palate.

The raised tail is ideal but the main boom will need shortened. I'm not cutting the carbon one! I've ordered another alu one for that job. It's working out nicely. The logitudinal position of the tail rotor will be in the same relative position as the original frame. I have ordered my quad tail which will assist with the extra torque of the quad head too. Although that's a bit suck it and see...

The last pic shows it with the A119 for comparison. It's pretty much the same size.

I'll get some more pics of the A119 on here when it has progressed but it is now available if anyone wants one just pm me.

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02-02-2009 11:26 PM  9 years agoPost 32
Boffy

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OK folks here are the latest photos of the project.

I have not had as much time to work on it as I had hoped but I have now fitted the fuselage with the relevant cutouts.

I am very pleased with the results so far.

I will hopefully get the fuselage painted over the next week.

I have the decal files saved somewhere so will have to dig them out and size them.

I am toying with buying a quad head for the main rotor. I have seen the CopterX quad head which looks awesome. Has anybody tried one?

http://www.ehirobo.com/shop/product...roducts_id=6653

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02-03-2009 01:47 AM  9 years agoPost 33
Sidneyw

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How do you go about in accessing/changing battery? I also like to know how the tail is installed. Can't wait to see how it looks after you paint it. I don't see mounting base plate, does it require one or not?

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02-03-2009 08:10 AM  9 years agoPost 34
Boffy

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I had not yet cut the fuselage to give battery access. It is also advisable to cut the side windows to aid cooling.

Here are the latest photos which should clarify what I am doing. The first two show the line where I have decided to split the nose from the main body. The second pic shows it cut apart.

It was then a matter of bonding the two halves of the nose together. I'm using methane based plastic welding solution. It's looking the part now.

This last pic shows the halves bonded together with the front and rear taped together.

I plan to use magnets to locate and hold the nose section in position. Again I will take photos when this is done.

The tail will be permanently glued along the top edge and probably screwed along the bottom edge.
To prevent the fuselage tail from shaking and vibrating just wrap a piece of soft foam around the tail boom which will allow the pitch control rod to slide freely yet prevent the fuselage from rattling. A piece of dishwashing sponge will do the trick. (I have some nice foam that I salvaged from previous packaging)

Because the fuselage has a flat bottom and happens to be perfect proportions for a Trex 450 there is no need for a fuselage base plate. The fuse is simply sandwiched between the skids and the frame with the screws passing through the fuselage holding the whole thing together. Again for cooling it is advisable to cut out some of the underside to allow for air movement.

There is ample room to allow the tail rotor pitch control rod to run along the top side of the boom allowing the tail rotor to be located correctly on the left side.

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02-17-2009 09:40 PM  9 years agoPost 35
Boffy

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Well I have been making some progress on the build.
I have the decals made and the final coat of yellow has been applied. Once the decals are applied I shall give it all a coat of acrylic spray varnish.

Here is a photo before the final coat.

It should be finished by the weekend...

That will free me up to concentrate on the Lynx. (I have been working on the raised tail and its relative proportions for the fuselage. I have the required bearings now; Full steam ahead!)

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02-17-2009 10:05 PM  9 years agoPost 36
axemanclint

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SWEET!!! looking good my friend! can't wait to see the final product with decals and clear coat!
Cheers,
clint

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

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02-18-2009 09:15 PM  9 years agoPost 37
Boffy

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OK I have now fitted and located the fuselage and applied the inkjet waterslide decals.

First I screwed the mid section back onto the frame then fitted the tail section in place. I secured it in position with tape and drilled through the rear of the mid section into the extended portion of the tail using a 2mm bit in a pin vice.

I then removed the tail section and fitted an M2 machine screw from the outside with a nylon nut inside. I applied cyano around the nut to create a captive nut. I removed that refitted the tail and repeated the process for the other side.

I have yet to decide how many more fixings I will add on the underside. I think 3 small self tappers are the answer there.

I will apply the stripes and clear acrylic topcoat next then remove the window masking (fingers crossed)

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02-19-2009 08:44 PM  9 years agoPost 38
Boffy

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Well the end is very much in sight!

The clear spray acrylic is a lovely finish.

The masking fluid came away from the windows nicely. I just ran around the edge with a sharp craft knife then peeled the paint and masking away.

I'll post a fuselage on ebay shortly if anyone is interested.

I'm well pleased with the way it has worked out. I think I will have to make an NYPD one between stages of making the Lynx.

I plan to make a start to the Lynx project in ernest on Monday.

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02-19-2009 09:54 PM  9 years agoPost 39
Sidneyw

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Very nice!! You flipped the tail rotor to the right side didn't you? Plan on 4-bladed head?

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02-19-2009 10:39 PM  9 years agoPost 40
axemanclint

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NIIIIIIICE!!! that's what I'm talking about! Man if you make the NYPD version, i will be all over that like fly's on rice. Love the work Boffy. It turned out great!

Cheers,
clint

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

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