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Just another Ballerina

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Chris Barlow20/01/2016 01:50:25
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1858 forum posts
1266 photos

Tonight I decided to have a play with my tips, after reading how much fun other people were having with their tips. I think Peter is very good at drawing up a nice curvy pair of tips.... and now I've run out of tip puns!

Looking at the plan the tip ribs just don't work so I only used it to cut the outlines of the tips. I then used the cross section drawings to mark the position of the tips on the last rib and cut the wedges to suit. I realised the last part rib cannot be simply glued to the last rib as the tip would have to be cut out around it so I cut out the middle where the tip will sit and glued that to the tip and wedges forming a square corner.

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I also rebated the trailing edge of the tips to fit under the rib capping

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The tips were then glued to the last full rib using aliphatic on the part rib and cyano on the edges of the tip and wedges. I had left the false leading edge on the wing long so that it coule be glued to the leading edge of the wing tips.

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The trailing edge of the tip sits nicely up to the rib capping.

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With a little more sanding the leading edge sheeting was cut and sanded to fit the wing tips. The curve of the wing means that the sheeting is not square cut to join the rest of the sheeting but is more of a slight curve. A bit of fitting and sanding should get a nice joint. Once happy with the fit the lower tip sheeting is glued on with aliphatic, pins and pegs.

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Finally, an OCD photo for John!

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Although it's late I may finish my coffee and pop out to the workshop to flip the wing over and glue up the top tip sheeting tonight then the glue will be dry for tomorrow!

Whatgoesup....20/01/2016 07:29:32
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47 forum posts
10 photos

That makes a lot more sense of building the wing tip Chris, - really informative blog and great looking build ! yes

Craig Thomas20/01/2016 08:11:31
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478 forum posts
161 photos

Hi Chris. Can I ask, I've noticed your investing your engine on this build, do 4 strokes run fine upside down?

I'm new to 4 strokes and am still trying to find the best way to instal my engine.

Low pass Pete20/01/2016 08:45:52
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221 forum posts
123 photos

Hi Craig

I am also inverting my engine (OS52 4 stroke). I do not have problems with inverted engines but you should make sure that the tank level is suitable. In the case of Ballerina I have made the cut-out in F2 larger so the tank can be installed lower than per the plan.

By inverting the engine it also means that the throttle linkage is simpler (see photo no 1 below). Some engines do however have problems upside down but my OS engine rarely have an issue with being upside down.

Would suggest that if possible to test run (on bench) to see if your selected engine is OK inverted. If not plan to run it at 90deg.

Hope that is helpful.

Regard

Peter

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McG 696920/01/2016 09:23:11
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2724 forum posts
1020 photos

I'm really wondering why I had to decide to join this year's MB, Chris...

Before springtime will be around, you guys will have your maiden at this tempo... and I will be left alone around here still struggling - all summer & autumn - how to make a straight scrollsaw cut... not even thinking how I will be able to use the balsa stripper before next winter ! frown

Anyway, great build blog & truly pedagogic. Love it.

And, please have some more OCD pics coming for John... and me.

Cheers

Chris

BRU - BE / CTR OCD Control

Craig Thomas20/01/2016 11:05:37
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478 forum posts
161 photos
I wouldn't worry about being left behind MCG. The way I'm going I'll still be at it in June. Time is my enemy at the moment. As for your build Chris. Looking at all your picture makes me a little envious. When I look at my wing it's a far cry from yours. I'm sure mine will fly, eventually but it's not gonna be the prettiest I don't think. Can I just say that I think your tips and the roundest most pert tips I've seen in a long while. . 😂😂😂
Chris Barlow20/01/2016 16:47:58
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1858 forum posts
1266 photos
Posted by Craig Thomas on 20/01/2016 08:11:31:

Hi Chris. Can I ask, I've noticed your investing your engine on this build, do 4 strokes run fine upside down?

I'm new to 4 strokes and am still trying to find the best way to instal my engine.

I find four strokes seem to run a bit better inverted for some reason. The only problems I've come across is when the fuel tank is a lot higher than the carb and it starts to flood the carb with fuel. Incidently the bottom of my fuel tank is 25mm from the bottom of the fuselage, a lot lower than the cut out in F2. Other than that there are no problems. Two strokes are different in that the glow plug can get drowned in fuel before starting and when at idle and need a blast of throttle to clear them out.

Chris Barlow20/01/2016 16:56:12
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1858 forum posts
1266 photos
Posted by McG 6969 on 20/01/2016 09:23:11:

I'm really wondering why I had to decide to join this year's MB, Chris...

Before springtime will be around, you guys will have your maiden at this tempo... and I will be left alone around here still struggling - all summer & autumn - how to make a straight scrollsaw cut... not even thinking how I will be able to use the balsa stripper before next winter ! frown

Anyway, great build blog & truly pedagogic. Love it.

And, please have some more OCD pics coming for John... and me.

Cheers

Chris

BRU - BE / CTR OCD Control

There's no deadline for completion or any rush to even complete the build this year! Please don't worry about when other Ballerinas are finished as most of us will still be here following the blogs and answering any questions. The important thing is that you enjoy the build and have the sense of acheivement of flying the model you built, not just assembled or bought.

I had to look up pedagogic, and you're most welcome. It's one of the reasons many of use still do the mass builds! laugh

Chris Barlow20/01/2016 17:01:05
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1858 forum posts
1266 photos
Posted by Craig Thomas on 20/01/2016 11:05:37:
I wouldn't worry about being left behind MCG. The way I'm going I'll still be at it in June. Time is my enemy at the moment. As for your build Chris. Looking at all your picture makes me a little envious. When I look at my wing it's a far cry from yours. I'm sure mine will fly, eventually but it's not gonna be the prettiest I don't think. Can I just say that I think your tips and the roundest most pert tips I've seen in a long while. . 😂😂😂

Just build to the standard you're happy with. If the best you can do in the beginning is covered with glue & bits of sawdust then that's fine if it's the best you can do. Nobody is born knowing how to do these things, they all come from experience and watching others.

And I'm very flattered you like my tips. blush

john stones 120/01/2016 19:22:31
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10762 forum posts
1481 photos

Only slight problem to an inverted engine is your glow clip, you might like to fit a remote glow lead, makes life a bit easier.

John

Low pass Pete20/01/2016 19:32:32
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221 forum posts
123 photos

Yes and no to using a remote glow clip. It would depend on the access to the glow plug.

For non scale I usually try to have direct access to the plug from below. There are a number of remote glows that are not so great. I usually use a Hangar 9 one as I have found these to be very good. However with a sport model I try to avoid them so to make things as simple and stupid as possible.

john stones 120/01/2016 19:44:41
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10762 forum posts
1481 photos

I've not seen any rough looking builds so far, others photo's always make their models look better than your own.

Chris is a good builder who's built a few before, and he no doubt has built up his tool collection and that makes things easier to get the build quality up.

Can I cut a straight line with the scroll saw ? Yes but I cut outside the line n sand it up. I use these cheap tools from Screwfix etc.

John

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john stones 120/01/2016 19:49:37
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10762 forum posts
1481 photos

Yep you'll need access to your plug whichever way you go Pete smiley Not a fan of complicating things either, but with a small model sometimes floors a bit near or glow start's too long.

Or you could go lecky devil

John

Bob Cotsford20/01/2016 22:52:00
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8067 forum posts
444 photos
Posted by john stones 1 on 20/01/2016 19:44:41:

I've not seen any rough looking builds so far, others photo's always make their models look better than your own.

and it helps if you only photo the good bits, or wait until the messy bits are covered over (not that I'd ever try anything like that wink)

Chris Barlow21/01/2016 01:02:42
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1858 forum posts
1266 photos

As John has mentioned above the downside to an inverted engine is access to the glow plug for starting and more importantly the safety issues getting the glow starter off after the engine has fired up! As I have an aversion to personal injury I am fitting a remote glow lead, but will retain the ability to un plug the lead to apply a glow starter directly to the glow plug if required.

There are basically two types of plug on the leads, a clip and a sprung cap. I prefer the cap as there's no chance of it shorting out on the engine.

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The sprung cap is fitted to the glow plug

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The black/earth lead is bolted to the engine mount and the remote plug connector mounted in a more accessible place, in my case it will be through a hole on top of the cowl.

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If the remote lead doesn't have a black/earth wire the metal mounting bracket must be mounted to a metal part of the engine.

I've also ordered a 90 degree elbow for the exhaust to keep it tight to the engine and exiting more on the center line of the fuselage.

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Tonights building work involved making the ailerons. Just like the wing I pinned the 1/16 parts to the plan but also pinned the opposite aileron alongside. The leading edge and ribs were glued down and the cap strips added. Finally the hinge blocks and horn mounting plate were glued in and the ailerons released from the board, trimmed and sanded flush.

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I planed the chamfers on the leading edges to give slightly more aileron deflection than required as it's much easier to simply reduce the throws than it is to try and increase then when covered! The ailerons were taped in place and the wing plus servos weighed.

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The tail surfaces were then added to the fuselage which was also weighed.

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1544g (3.4lb) so far minus rx battery, rx, cowl, prop, spinner, tail fairings, under carriage and covering. A quick assembly also indicated that it's currently nose heavy with a CoG 30mm from the leading edge. Well that's my excuse for pinning the parts together to see what it looks like!

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Chris Barlow21/01/2016 01:12:02
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1858 forum posts
1266 photos
Posted by john stones 1 on 19/01/2016 23:53:55:

I see in your pics of the t/plane seat in the post showing the stringer infils, you cut as plan, later on it looks like you recut as the later mod ?

John

Yes the fuselage sides and rear doublers were already cut when I read up on the tail plane position so I have re cut the tail plane seat all the way up to F10. I think I prefer it like this when the hinge line for the rudder and elevator don't line up.

There is also a 1/4 thick triangular infill required behind the elevator joiner which can be glued in when the tail plane is fitted.

Craig Thomas21/01/2016 06:34:25
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478 forum posts
161 photos

That looks great Chris. I can't wait to get to that stage when things start to come together. I've been thinking of a remote glow lead. Might make it a little easier at the field.

Peter Miller21/01/2016 08:39:37
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10330 forum posts
1231 photos
10 articles
Posted by Chris Barlow on 21/01/2016 01:02:42:

As John has mentioned above the downside to an inverted engine is access to the glow plug for starting and more importantly the safety issues getting the glow starter off after the engine has fired up! As I have an aversion to personal injury I am fitting a remote glow lead, but will retain the ability to un plug the lead to apply a glow starter directly to the glow plug if required.

There are basically two types of plug on the leads, a clip and a sprung cap. I prefer the cap as there's no chance of it shorting out on the engine.

20160120_213756.jpg

The sprung cap is fitted to the glow plug

T

1544g (3.4lb) so far minus rx battery, rx, cowl, prop, spinner, tail fairings, under carriage and covering. A quick assembly also indicated that it's currently nose heavy with a CoG 30mm from the leading edge. Well that's my excuse for pinning the parts together to see what it looks like!

20160121_001150.jpg

Two things. I notice the leading edge capstrip has still to be glued on...You see, I do study the builds!!

Main thing. I prefer the wire clip for the remote connector. I simply slide fuel tube over it and make a hole for the plug post. The fue tube makes sure that it doesen't short out and also applies a little more pressure to the clip.

Chris Barlow21/01/2016 17:58:28
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1858 forum posts
1266 photos

Yep Leading edge still to fit! It's a little unnerving to think you're scrutinising our work as we build! wink

R.E the fuel tube over the glow clip, that's a great idea! I have one on my Raptor 30 that I always check before starting so I'll put some fuel tube on it now!

Shhhh, Peter's watching! laugh

john stones 121/01/2016 18:04:26
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10762 forum posts
1481 photos

He's probably noticed you've not scalloped those infills yet, but he's too polite to say owt, as am I teeth 2

John

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