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My Ultimate Biplane Build

The World Models 27% Ultimate 50cc Biplane Build Blog

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Gary Manuel05/09/2017 16:02:28
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1889 forum posts
1508 photos

Following on from THIS thread, here's my World Models 27% build blog.

Other than the purchase of the ARTF model itself, most of the bits I'll be using will be from a recent unplanned meeting between my lovely Thunder Tiger 28% Katana and Terra Firma crying.

THIS is what I'm replacing it with. It is on a fairly tight budget, so I may be making a few compromises along the way.

It will be fitted with a DLE 55RA with a decent quality (unknown make) after market Pits style silencer.

Servos will be:

4 x HiTec HS-5625MG for the Ailerons.

1 x HiTec HS-5985MG for the rudder.

2 x HiTec HS-5645MG for the two elevator halves.

1 x Futaba S3003 for the throttle.

I'll also use a RCExl Kill Switch Mk2 on the last remaining channel on my JR DSX9 Mk2 transmitter. Receiver will be a 9 channel JR RD921. Choke will be manually controlled.

I will be using a single 5 cell 3700mAh NiMh battery for the ignition and a single 2 cell 2100mAh LiFeP04 for the ignition. Both batteries will be switched via an AGM J-003 Dual Switch / Fuel Dot.

Gary Manuel05/09/2017 16:13:03
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1889 forum posts
1508 photos

The first surprise I had when the model arrived was how small the box was.

It measured 1180 x 330 x 400mm.

dscn5558.jpg

Not bad packing for a model that has a wingspan of 1600mm and fuselage length of 1690mm.

dscn5559.jpg

Ah - that explains it. The fuselage does not include an engine box. That must be part of the build. Makes sense I suppose as it allows the engine box to be adapted to suit the engine used.

dscn5560.jpg

Gary Manuel05/09/2017 16:28:13
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1889 forum posts
1508 photos

There are the wings, outer cabanes, tailplane and a pair of plywood wing incidence templates.

All nicely packaged in individual plastic bags with plenty of polystyrene packing pieces.

dscn5563.jpg

Fuselage, tail fin, wing tubes, undercarriage, cowl and accessories. All nicely packaged. Quality looks good so far, apart from .....

dscn5564.jpg

...... the cowl.

Looks like the clear lacquer coating has run in places. The cowl is also very thin (and light), to the point where is will need some reinforcement around the fixing points.

I'll comment on the various accessories later as I unpack / fit them.

dscn5566.jpg

john stones 105/09/2017 16:37:39
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10586 forum posts
1480 photos

Henry likes it. face 1

Gary Manuel05/09/2017 18:49:06
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1889 forum posts
1508 photos
Posted by john stones 1 on 05/09/2017 16:37:39:

Henry likes it. face 1

Henry sucks!

 

I'm starting with the wings, so that I can pack them out of the way in wing bags while I continue with the rest of it.

They look to be well made.

dscn5567.jpg

 

Covering is a bit rough in places. Nothing that a good going over with a hot iron won't sort.

dscn5568.jpg

 

dscn5569.jpg

 

I found what I thought was sellotape in a few places, so I peeled it off. I realised later that is some sort of clear tape placed to protect vulnerable parts of covering from peeling off (I normally put nail varnish on these). It appears to be hot iron proof, so I'll leave it in place in future. (apologies for poor focus)

dscn5570.jpg

Edited By Gary Manuel on 05/09/2017 18:50:06

Gary Manuel05/09/2017 18:56:13
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1889 forum posts
1508 photos

Wings and other surfaces come pre-hinged with cyano hinges.

These are apparently only temporary - these hinges are to be removed and replaced ......

dscn5571.jpg

...... by these metal hinges.

dscn5572.jpg

I used the cyano hinges in the aileron to mark the position and place the metal hinges into the wings.

dscn5574.jpg

There are 7 hinges in each wing.

Here's the first one waiting for the epoxy on the hinges to harden.

dscn5573.jpg

Gary Manuel05/09/2017 19:04:31
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1889 forum posts
1508 photos

Whilst waiting for hinge epoxy to harden, I've made a start on the servo arms.

These look rather nice, with a tiny ball bearing to reduce friction and avoid free play.

dscn5575.jpg

 

HiTec servo discs drilled and bolted onto the supplied servo arms.

dscn5576.jpg

 

Servo centred using a servo tester, allowing the servo arm to be fitted.

Servo then fitted to the supplied servo trays.

dscn5577.jpg

Edited By Gary Manuel on 05/09/2017 19:05:34

onetenor05/09/2017 19:12:24
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1900 forum posts
Posted by Gary Manuel on 05/09/2017 16:02:28:

Following on from THIS thread, here's my World Models 27% build blog.

Other than the purchase of the ARTF model itself, most of the bits I'll be using will be from a recent unplanned meeting between my lovely Thunder Tiger 28% Katana and Terra Firma crying.

THIS is what I'm replacing it with. It is on a fairly tight budget, so I may be making a few compromises along the way.

It will be fitted with a DLE 55RA with a decent quality (unknown make) after market Pits style silencer.

Servos will be:

4 x HiTec HS-5625MG for the Ailerons.

1 x HiTec HS-5985MG for the rudder.

2 x HiTec HS-5645MG for the two elevator halves.

1 x Futaba S3003 for the throttle.

I'll also use a RCExl Kill Switch Mk2 on the last remaining channel on my JR DSX9 Mk2 transmitter. Receiver will be a 9 channel JR RD921. Choke will be manually controlled.

I will be using a single 5 cell 3700mAh NiMh battery for the ignition and a single 2 cell 2100mAh LiFeP04 for the ignition. Both batteries will be switched via an AGM J-003 Dual Switch / Fuel Dot.

Both sets of batteries for ignition ? LOL

john stones 105/09/2017 19:15:09
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10586 forum posts
1480 photos

Love the servo horns, where you get spiral wrap for servo leads ?

cymaz05/09/2017 19:16:08
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8652 forum posts
1175 photos

 

I'm watching ! coolyes

 

Spiral wrap

Edited By cymaz on 05/09/2017 19:18:10

Edited By cymaz on 05/09/2017 19:18:44

john stones 105/09/2017 19:21:17
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10586 forum posts
1480 photos

Cheers Cymas. yes

Rich too05/09/2017 19:40:01
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3020 forum posts
1070 photos

Excellent yes sub'd

Gary Manuel05/09/2017 20:43:52
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1889 forum posts
1508 photos
Posted by onetenor on 05/09/2017 19:12:24:
Posted by Gary Manuel on 05/09/2017 16:02:28:

I will be using a single 5 cell 3700mAh NiMh battery for the ignition and a single 2 cell 2100mAh LiFeP04 for the ignition. Both batteries will be switched via an AGM J-003 Dual Switch / Fuel Dot.

Both sets of batteries for ignition ? LOL

Oops.

NiMh is for the receiver.

Gary Manuel05/09/2017 20:55:48
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1889 forum posts
1508 photos

I've only epoxied the one wing at the moment. I did these dry, without putting any oil / Vaseline into the pins then wiped excess epoxy off with a cotton bud before pushing the hinges fully in.

Before I do the others, I want to wait till the epoxy has fully set to test:

1. That I can't pull them out.

2. That the hinges still move freely and are not gummed up with epoxy.

I think I'll attempt to dribble a drop of machine oil into future ones, but am a little bit concerned about getting oil onto the surface to be glued.

Edited By Gary Manuel on 05/09/2017 20:58:16

Rich too06/09/2017 06:27:22
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3020 forum posts
1070 photos

I don't think you'd have a problem with them pulling out. You could pin them but I don't think that's necessary. I would probably use Robarts instead.

Nice model though, I would be tempted by one, The 33% appears to be great value...

Gary Manuel06/09/2017 09:48:44
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1889 forum posts
1508 photos

I did think about using Robart hinges but decided go give the supplied metal ones a try.

Yes - 33% version is not much dearer than the 27%. My DLE111 is still in use though; and long may it remain so.

Edited By Gary Manuel on 06/09/2017 09:52:22

extra slim06/09/2017 10:03:51
448 forum posts
48 photos

Nice, I use one of my kids Wax crayon across both sides of the hinge joint.. once dry, there is usually a nice little "snap" when I move the hinge for any tiny amount of expoxy freeing off (or gorilla.. I like gorilla as it expands into the holes etc).. worked for me for years...

Gary Manuel06/09/2017 10:40:59
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1889 forum posts
1508 photos

Hmmm - Gorilla Glue. There's a thought.

Goes on really thin and expands to fill the gaps and holes in the hinges. I'll see what the epoxy has set like and might just try GG if I'm not satisfied.

john stones 106/09/2017 17:56:59
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10586 forum posts
1480 photos

Gorilla Glue ? mind them trees kulou

Gary Manuel06/09/2017 18:37:55
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1889 forum posts
1508 photos

I'm sticking with epoxy (pun intended).

What I found was that the covering film got in the way of the hinge / epoxy joint. Also, the shape of the hinge limits how small the hinge gap can be. Like this:

dscn5579.jpg

What I'll be doing for future hinges, is cutting a bevel into the covering / balsa to allow the hinge to be set into the surface a little bit further. This should get the covering out of the way and allow the gap to be reduced to a minimum.

dscn5578.jpg

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