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HelicopterScale Model RC Helicopters Docs  450 Scale Lynx AH-7 My first Scale build
12-13-2016 09:29 AM  6 months agoPost 41
seaharrierman

Heliman

Gosport UK

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Managed to squeeze a few hours in over the weekend between putting up Christmas decs and family stuff.

As I'm still waiting for new tail drive belts I decided to work on the fuselage and get it ready for painting and lighting. So Removed airframe from fuselage and using 80 grit paper rubbed down around seem and cleaned with white spirt.

Then in small batches as the filler only has a 4 to 5 minute working time I applied David's Isopon Plastic Bumper (think you yanks call it a Fender) Filler to all the seems and under the nose to build up for a better match. This involved filling sanding and repeat.

While waiting for filler to set I cut out horizontal stabilizer from 6mm balsa and sanded to shape

I used my dremmel drill press to with the piece held vertically to drill 2mm holes for m2 30mm bolts with heads removed which were glued in with epoxy

Once the final filler had set I I rubbed down the whole fuselage with progressively fine grades of sand paper 80,120, 240,320,400 and 600. Ready for proof priming coat

Whilst I was rubbing down the fuselage 2 layer of fine glass cloth was applied to the horizontal stabilizer

next set is to make the Nav light and anti col blisters. wait for kids to finish a bottle of coke. in mean time I need to carve the molds

Any questions please ask.

Glen

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12-13-2016 12:06 PM  6 months agoPost 42
Thumper217

Senior Heliman

Slidell, LA - USA

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Thanks for sharing this build thread. Don't usually see detailed builds on the smaller helis and I am really enjoying this one. Your attention to detail is admirable and should lead to a really nice finish.

Andrew

Thumper

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12-13-2016 05:34 PM  6 months agoPost 43
seaharrierman

Heliman

Gosport UK

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Hi Andrew

Thanks for that. It does make doing this feel worth while. I agree with you that there just aren't enough smaller heli builds. I looked before I started this build as I'm a complete beginner to building flying models so was looking for inspiration. I hope my build helps others like me that can't afford the 600 and 700's and limited to 500 and below

glen

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12-16-2016 07:54 AM  6 months agoPost 44
seaharrierman

Heliman

Gosport UK

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Well Guys its been a productive few days I finished and fitted the horizontal stabilizer

After all the sanding and tidying up I refitted the skids

While all that's was being done the new tail drive belts arrived and were fitted.

Last night I went to my club and had 2 flights as pod and boom to check all was well with new belts etc. Once satisfied all was working well the airframe was fitted into the fuselage which was a lot of with club members looking on and taking bets of how long to crash then once in lots on that looks great lets see it fly.

I have to admit I was very nervous and almost lost me nerve to fly it but in good old british fashion a cup of strong stomach in chest out let do it

Watch at YouTube

I am one very happy chap was not pretty flying but that was probably nerves I went home after and celebrated with a large glass of a very nice scotch single malt

Its now going to taken out the fuselage some detail added painted and lighting fitted

I look forward to hearing your view comments and any ideas or suggestion you may have

Glen

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12-16-2016 11:41 AM  6 months agoPost 45
Thumper217

Senior Heliman

Slidell, LA - USA

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Glen,

That looked great! Seems to hover pretty steady and the tail looked solid. I like how the copter-x head allows the blades to droop a little, that looks cool.

Nice work and congratulations. Can't wait to see the details and finishing. Should look nice.

Andrew

Thumper

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12-16-2016 03:37 PM  6 months agoPost 46
v22chap

Key Veteran

Granger, Indiana

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Congrats on a fine looking 450 ,, it looks well behaved once out of ground effect .. Looking forward to the rest of the detail / paint and "full " scale flying .... keep up the good work .At its size I wouldn't do small detailing,ie many rivets and screws as it will be most to small to see in the air ... things like antenna , pilot tubes and such will be enough ... of course you can see the small stuff while handling it and some times I just do that for my own appreciation ,, even if no one else sees it
The main thing here is to have fun and to me ,,, building and detail is part of the fun .

Larry C ----------Bergen R/C helicopters

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12-17-2016 03:07 AM  6 months agoPost 47
206 pilot

Veteran

,Long Island,new york

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Hey glen, from start to almost finished, your doing a great job!!! Your coming down to a finish machine, take your time and double check everything keep up the nice work, looking foward to seeing the paint job...Rich

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12-17-2016 10:34 AM  6 months agoPost 48
seaharrierman

Heliman

Gosport UK

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Thanks Andrew yes she flew and behaved herself beautifully and no hint of wag issues I was having. I'm looking forward to finishing her off

Many Thanks Larry I'm thing the same with detailing a few panel lines aerial's maybe weapons will be more than enough. I am going to try an make a set of skids from scratch rather try a disguise the ones I have.

Thanks Rich. Yes nearly there but its all in the finish. I have a good set of coloured drawings to follow to make sure I get camo and markings right

Over the weekend I hope to make moulds for col and nav light and hopefully make a start on new skids

I do have a questions whats better paint the windows black or use a smoke tint? I'm not going to detail the interior and don't want to see the mechanics like to here you views

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12-17-2016 11:36 AM  6 months agoPost 49
206 pilot

Veteran

,Long Island,new york

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Hi Glen I used window tint on my 407 it looks great if done correct, I would stay away from the spray tint.. Rich

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12-17-2016 12:45 PM  6 months agoPost 50
seaharrierman

Heliman

Gosport UK

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Thanks rich I was going to use the Tamiya one if I don't like it can always paint over with black on outside

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12-17-2016 02:27 PM  6 months agoPost 51
v22chap

Key Veteran

Granger, Indiana

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I use the Tamiya tint ,,, but practice on a scrap piece of material as it takes a certain technique to get a light coats so you don't get runs . It also takes many light coats to get it dark enough to not see much inside .I think the secret to it is a light coat and let it dry for the proper time and then another light coat ... if you do it to quick it just reactivates the first one and they blend together and if not run they pool to make darker areas than others.

Larry C ----------Bergen R/C helicopters

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12-17-2016 08:22 PM  6 months agoPost 52
seaharrierman

Heliman

Gosport UK

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I'm thinking is it best to thin down a bit?

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12-17-2016 08:22 PM  6 months agoPost 53
seaharrierman

Heliman

Gosport UK

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Today I have made a start on making a set of custom scale skids. Your going to have to bear with me on this one as its going to be trial and error using good old British back of fag (cigarette) packet engineering.

Starting with the front first I cut a 7mm strip from a sheet of 1.6mm aluminium. I had to use a dremmel with a metal cutting disc to cut the strip as I don't access to a guillotine which would of been so much easier . Notice I am using a skid from the Airfix Kit as a pattern.

This was cleaned up and de-burred with 2nd and 3rd cut files follow by 600 grade wet and dry in exactly the same way I used make parts for real aircraft. I worked out the angles and made a plastic template to ensure I bent the correct angle. once bent using a height gauge I marked where outside of the skid tube should start. using a small pipe cutter I cut the skid tubes to length from 8mm aluminium tube

I'm not going to explain how will all fit together but have and idea in my head and will show you as I go along and I'm still deciding weather or not to put the slight radius in the rear skid strust and if I do how

Glen

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12-17-2016 09:20 PM  6 months agoPost 54
206 pilot

Veteran

,Long Island,new york

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Tyama? Runaway lol

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12-17-2016 10:00 PM  6 months agoPost 55
seaharrierman

Heliman

Gosport UK

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you have lost me there rich?

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12-17-2016 10:12 PM  6 months agoPost 56
206 pilot

Veteran

,Long Island,new york

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I sent u a pm

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12-17-2016 10:35 PM  6 months agoPost 57
seaharrierman

Heliman

Gosport UK

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Got it

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12-20-2016 08:57 AM  6 months agoPost 58
seaharrierman

Heliman

Gosport UK

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I Have now made the front and rear external skid struts and dry fitted to assess how she sits

Maybe sitting a little to much tail down but that should be rectified when skids are fitted

Now working on doubling up skid struts for strength these will attach internally

Glen

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12-20-2016 06:57 PM  6 months agoPost 59
seaharrierman

Heliman

Gosport UK

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Ok The struts are complete. a U section underneath the fuselage and 2 half sections internally drilled and bolted into position using m2 bolts washer and nut. Eventually the bolt will be replaced with countersunk bolts. The skid tube where offered up and marked holes for struts to fit and using my drummel drilled and filed these to size. The Struts were adjusted to correct length

I'm not sure yet how I going to fix the struts to skid tubes. I am thinking of drill right through and pegging with some bar and fixing with resin.

tomorrow I hope to have the skid ends and fairings made and with any luck a test flight Thursday evening

Glen

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12-20-2016 08:25 PM  6 months agoPost 60
v22chap

Key Veteran

Granger, Indiana

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You need something to keep the landing strut from moving around inside the tube ... even if you drill and pin the strut to the skid.
If possible (can't see from the picture ) but if there is enough room on the top of the strut to leave a little support ,,, I would put a dowel rod inside the skid ,,dremel out the wood area inside the skid for the strut to fit in the hole again and then you can put in a counter sunk screw (from the bottom inside of skid ) and tighten it and the strut stays in place .Put some CA glue in the wood hole for the strut and screw hole to give that area a little more strength from the area taken out for the strut .
Hope this makes some sense ,, maybe need a hand drawn picture ???
Any how looking good so far ... keep up the good work

Larry C ----------Bergen R/C helicopters

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