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Design & Build Sport Twin

Sport Aerobat for 2 x 40s

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Nigel R27/04/2019 22:20:50
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2724 forum posts
445 photos

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Nigel R27/04/2019 22:21:14
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2724 forum posts
445 photos

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Nigel R27/04/2019 22:21:44
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2724 forum posts
445 photos

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Nigel R27/04/2019 22:24:08
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2724 forum posts
445 photos

Been a bit lax about updating this log lately. Nevertheless some slow but useful progress. Top sheeting is now on and leading and talking edges attached and I've got the ailerons shaped.

All very conventional so far. Next jobs are to sort the torque rods and then join the panels.

Dwain Dibley.28/04/2019 00:27:55
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1225 forum posts
1246 photos

Keep it coming Nigel, I love seeing other modellers builds.................it keeps the juices flowing. winklaugh

D.D.

Nigel R28/04/2019 07:42:10
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2724 forum posts
445 photos

Thanks DD will do!

robert chamberlain28/04/2019 09:16:15
110 forum posts

the Super Sportster would make a nice ship, I think, but it has been awhile since I have seen a kit. I think there is an ARTF out there somewhere.

Nigel R28/04/2019 14:04:34
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2724 forum posts
445 photos

Hi robert. Plans for all the sizes have made it on to outerzone now. all look Plenty detailed enough to scratch build from should you wish.

Nigel R29/04/2019 05:47:15
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2724 forum posts
445 photos

This only took one attempt, with absolutely no mistakes...

20190428_221448.jpg

In reality I nearly made two left hand rods. Measure twice, still get it wing...

Nigel R03/05/2019 17:15:11
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2724 forum posts
445 photos

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Nigel R03/05/2019 17:15:38
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2724 forum posts
445 photos

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Nigel R03/05/2019 17:19:07
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2724 forum posts
445 photos

I feel like I've reached a bit if a milestone

Only tips and joining to go really then it's on to the fuselage. Three if them, kind of.

Weight of wing in total so far is almost exactly 1lb. Both panels with the same to within a couple of grams. Very happy with that.

Nigel R08/05/2019 23:04:11
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2724 forum posts
445 photos

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Nigel R08/05/2019 23:06:50
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2724 forum posts
445 photos

Mooching steadily forward. Like Abraham Lincoln. As long as I don't go backwards, all is well. 

 

Panels joined and rough cut tips in place.

 

Wing is starting to outgrow the workspace! I have to be extra careful with it now to avoid the dreaded hangar rash.

A wiser man might have shaped the tips first. Never mind. 

Edited By Nigel R on 08/05/2019 23:12:00

Nigel R10/05/2019 23:12:47
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2724 forum posts
445 photos

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Tips knocked back to airfoil shape.

Three layers of lightweight glass on the wing join, 2", 6" and 12" all stuck down with high tech PVA.

The glass still needs one or two more thin costs of PVA to fill the weave properly and make a nice smooth surface.

Also realised that I have cut the ailerons slightly short. So will have to stick on a 1/2" block to disguise this and give enough material to blend into the shape of the tips. Whoops.

It's definitely feeling quite large now. I nearly trod on a wingtip while moving it from one place to another and the wind caught it. That would certainly have made the aileron gaffe look inconsequential.

I need a bigger workshop!

Dwain Dibley.10/05/2019 23:48:29
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1225 forum posts
1246 photos
Posted by Nigel R on 10/05/2019 23:12:47:

I need a bigger workshop!

Tell me about it.....................frown Can't swing a cat in mine at the moment.

No matter, that build is super tidy Matey.

Looking good.

D.D.

Nigel R11/05/2019 19:50:43
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2724 forum posts
445 photos

Thanks DD much appreciated!

Time to put the wing aside for a little while now.

Got a bit of the tailplane done today:

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My usual method of 1/8 framework and 1/16 sheet. All cyano for this bit but the next sheet will be contact adhesive.

When I've finished the sheeting I'll add a hard 1/4 at front and rear which act a bit like spars and stiffen it up a bit.

Nigel R15/05/2019 10:44:53
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2724 forum posts
445 photos

Inching along. Main tailplane sheeted, sheeting trimmed back, and some med/hard strips going on at LE and TE:

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Tricky to see above, but the edges now look like:

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...and it has stiffened up nicely with the med/hard material around the edges.

Nigel R17/05/2019 13:37:11
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2724 forum posts
445 photos

Time for the elevator to be put together.

Start with some 1/2 x 1/4 spruce and med/hard balsa. They have had a taper put on them using a disc sander:

20190516_221254.jpg

The taper is about 30 deg. Total length of spruce joiner, about 5". I like spruce joiners, they do double duty as a good hard point for the control horn. Less vague than a wire joiner, too.

Next up, stick them together...

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And I will also need a 1-12" wide strip of med or med/light balsa:

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...and then they both needs sticking together...

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and presto - I have an oversized blank... which is then cut down to length, and hinged:

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I shall probably leave the tailplane there. That all went quite well, I've managed for once to get the hinge line in the right place (i.e. the middle)!

Only problem encountered was that the 1/4 med sheet I had is a bit heavier than I'd like. Not a massive deal in the grand scheme of things, but unwanted weight at the tail end is always worse than anywhere else.

I'm going to do the rest of the tailplane jobs later on in the build - the rudder cutout, any shaping needed for the LE and tips, and the taper on the elevator. I think I have enough done now to use when building the fuselage.

Nigel R22/05/2019 10:36:30
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2724 forum posts
445 photos

Made a start on the fuselage by cutting the sides and doublers. I've not shaped the wing saddle yet, that's the next job.

The ply was scrubbed with some 180 grit before doing anything with it.

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The doublers were glued on with contact adhesive. I find a big syringe, 10ml or 20ml size, is very useful to evenly spread the stuff around. It dries very very quickly in this warm weather.

I use a couple of toothpicks to peg everything in the right place as I'm pushing everything together:

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After that, they were laid flat on the board and weighted down overnight, while the contact adhesive dries out.

The bond is of course very strong right from the get go (hence the pegs to align things and avoid misalignment) but I believe it takes a good few hours for all the solvent to evaporate and for the joint to achieve full strength.

Edited By Nigel R on 22/05/2019 10:44:35

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